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1 lt 1 3 1 2 fea tures descriptio n u single pcmcia vpp driver/regulator n digital selection of 0v, v cc , 12v or hi-z n 120ma output current capability n internal current limiting and thermal shutdown n automatic switching from 3.3v to 5v n powered from unregulated 13v to 20v supply n logic compatible with standard pcmcia controllers n 1 m f output capacitor n 30 m a quiescent current in hi-z or 0v mode n vpp valid status feedback signal n no vpp overshoot n 8-pin so packaging the lt 1312 is a member of linear technology corporations family of pcmcia drivers/regulators. the lt1312 provides 0v, 3.3v, 5v, 12v and hi-z regulated power to the vpp pin of a pcmcia card slot from a single unregulated 13v to 20v supply. when used in conjunction with a pc card interface controller, the lt1312 forms a complete minimum component-count interface for palm- top, pen-based and notebook computers. the v p p output voltage is selected by two logic compatible digital inputs which interface directly with industry standard pc card interface controllers. automatic 3.3v to 5v switching is provided by an internal comparator which continuously monitors the pc card v cc supply and automatically adjusts the regulated vpp out- put to match v cc when the vpp = v cc mode is selected. an open-collector vpp valid output is driven low when vpp is in regulation at 12v. the lt1312 is available in an 8-pin so package. applica tio n s u n notebook computers n palmtop computers n pen-based computers n handi-terminals n bar-code readers n flash memory programming v s 13v to 20v 3.3v or 5v en0 c out 1 m f tantalum vpp out vpp1 vpp2 pcmcia card slot v cc lt1312 en1 valid sense gnd lt1312 ta1 pcmcia card slot controller + typical applica tio n u typical pcmcia single slot vpp driver lt1312 truth table en0 en1 sense vpp out valid 00 x 0 v 1 1 0 x 12v 0 0 1 3.0v to 3.6v 3.3v 1 0 1 4.5v to 5.5v 5v 1 1 1 x hi-z 1 x = dont care linear technology pcmcia product family device description package lt1312 single pcmcia vpp driver/regulator 8-pin so lt1313 dual pcmcia vpp driver/regulator 1 6-pin so* ltc 1314 single pcmcia switch matrix 1 4-pin so ltc1315 dual pcmcia switch matrix 2 4-pin ssop ltc1470 protected v cc 5v/3.3v switch matrix 8 -pin so ltc1472 protected v cc and vpp switch matrix 1 6-pin so* *narrow body , ltc and lt are registered trademarks of linear technology corporation. for information purposes only obsolete: contact linear technology for potential replacement
2 lt1312 absolute m axi m u m ratings w ww u package/order i n for m atio n w u u supply voltage ........................................................ 22v digital input voltage ........................ 7v to (gnd C 0.3v) sense input voltage ......................... 7v to (gnd C 0.3v) valid output voltage ...................... 15v to (gnd C 0.3v) output short-circuit duration .......................... indefinite operating temperature ................................ 0 c to 70 c junction temperature ................................ 0 c to 125 c storage temperature range ..................C65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c lt1312cs8 order part number consult factory for industrial and military grade parts. t jmax = 125 c, q ja = 150 c/ w 1312 s8 part marking electrical characteristics symbol parameter conditions min typ max units vpp out output voltage program to 12v, i out 120ma (note 1) l 11.52 12.00 12.48 v program to 5v, i out 30ma (note 1) l 4.75 5.00 5.25 v program to 3.3v, i out 30ma (note 1) l 3.135 3.30 3.465 v program to 0v, i out = C 300 m a 0.42 0.60 v i lkg output leakage program to hi-z, 0v vpp out 12v l C10 10 m a i s supply current program to 0v l 30 50 m a program to hi-z l 30 50 m a program to 12v, no load l 230 360 m a program to 5v, no load l 75 120 m a program to 3.3v, no load l 55 90 m a program to 12v, i out = 120ma l 126 132 ma program to 5v, i out = 30ma l 31 33 ma program to 3.3v, i out = 30ma l 31 33 ma i lim current limit program to 3.3v, 5v or 12v 330 500 ma v enh enable input high voltage l 2.4 v v enl enable input low voltage l 0.4 v i enh enable input high current 2.4v v in 5.5v 20 50 m a i enl enable input low current 0v v in 0.4v 0.01 1 m a v sen5 v cc sense threshold vpp out = 3.3v to 5v l 3.60 4.05 4.50 v v sen3 v cc sense threshold vpp out = 5v to 3.3v l 3.60 4.00 4.50 v i sen v cc sense input current v sense = 5v 38 60 m a v sense = 3.3v 18 30 m a v valid th vpp valid threshold voltage program to 12v l 10.5 11 11.5 v i valid vpp valid output drive current program to 12v, v valid = 0.4v 1 3.3 ma vpp valid output leakage current program to 0v, v valid = 12v 0.1 10 m a the l denotes the specifications which apply over the full operating temperature range. note 1: for junction temperatures greater than 110 c, a minimum load of 1ma is recommended. v s = 13v to 20v, t a = 25 c, unless otherwise noted. 1 2 3 4 8 7 6 5 top view s8 package 8-lead plastic so gnd eno en1 valid vpp out n.c. v s sense
3 lt1312 typical perfor m a n ce characteristics u w output current (ma) 0 ground pin current (ma) 8 10 12 160 lt1312 g7 6 4 0 40 80 120 2 16 14 20 60 100 140 t j = 25? v s = 15v supply voltage (v) 0 quiescent current (?) 30 40 50 20 lt1312 g1 20 10 0 5 10 15 25 t j = 25? en0 = en1= 0v or en0 = en1= 5v quiescent current (12v mode) quiescent current (0v or hi-z mode) junction temperature (?) 0 0 short-circuit current (ma) 100 200 300 400 500 600 25 50 75 100 lt1312 g9 125 v s = 15v vpp out = 0v current limit supply voltage (v) 0 ground current (ma) 1.5 2.0 2.5 20 lt1312 g6 1.0 0.5 0 5 10 15 25 t j = 25? en0 = 0v en1 = 5v v sense = 3.3v r l = 110 w i l = 30ma* *for vpp out = 3.3v r l = 330 w i l = 10ma* ground pin current (3.3v mode) supply voltage (v) 0 quiescent current (?) 150 200 250 20 lt1312 g3 100 50 0 5 10 15 25 t j = 25? en0 = 0v en1 = 5v r l = v sense = 5v v sense = 3.3v quiescent current (3.3v/5v mode) supply voltage (v) 0 quiescent current (?) 300 400 500 20 lt1312 g2 200 100 0 5 10 15 25 t j = 25? en0 = 5v en1 = 0v r l = ground pin current supply voltage (v) 0 ground current (ma) 6 8 10 20 lt1312 g4 4 2 0 5 10 15 25 t j = 25? en0 = 5v en1 = 0v r l = 100 w i l = 120ma* r l = 200 w i l = 60ma* *for vpp out = 12v r l = 400 w i l = 30ma* ground pin current (12v mode) ground pin current (5v mode) supply voltage (v) 0 ground current (ma) 1.5 2.0 2.5 20 lt1312 g5 1.0 0.5 0 5 10 15 25 t j = 25? en0 = 0v en1 = 5v v sense = 5v r l = 167 w i l = 30ma* *for vpp out = 5v r l = 500 w i l = 10ma* current limit input voltage (v) 0 short-circuit current (ma) 300 400 500 15 25 lt1312 g8 200 100 0 510 20 600 700 800 t j = 25? vpp out = 0v
4 lt1312 typical perfor m a n ce characteristics u w v cc sense input current junction temperature (?) 0 0 input threshold voltage (v) 0.5 1.0 1.5 2.0 2.5 3.0 25 50 75 100 lt1312 g10 125 v s = 15v 12v turn-on waveform enable input current enable input threshold voltage enable input voltage (v) 0 0 enable input current (?) 10 20 30 40 50 1 234 lt1312 g11 56 t j = 25? v s = 15v v cc sense threshold voltage junction temperature (?) 0 2.5 v cc sense threshold voltages (v) 3.0 3.5 4.0 4.5 5.0 5.5 25 50 75 100 lt1312 g12 125 t j = 25? v s = 15v switch to 5v switch to 3.3v enable input voltage (v) 0 0 v cc sense input current (?) 10 20 30 40 50 1 234 lt1312 g13 56 t j = 25? v s = 15v valid output voltage valid output current (ma) 0 0 valid output voltage (v) 0.2 0.4 0.6 0.8 1.0 0.5 1.0 1.5 2.0 lt1312 g14 2.5 3.0 t j = 25? v s = 15v en0 = 5v en1 = 0v ripple rejection (12v) frequency (hz) 10 ripple rejection ratio (db) 100 1k 10k 100k 1m lt1312 g15 100 80 60 40 20 0 t j = 25?, 12v mode v s = 15v + 100mv rms ripple c out = 1? tantalum time (ms) 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 output voltage (v) en0 input (v) 0 11.6 12.4 lt1312 g16 5 11.8 12.0 12.2 c out = 1? c out = 10? v s = 15v load transient response (12v) time (ms) 0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 output voltage change (v) load current (ma) 50 ?.4 0.4 lt1312 g18 100 ?.2 0 0.2 c out = 1? c out = 10? line transient response (12v) time (ms) 0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 output voltage change (mv) supply voltage (v) 13 ?0 40 lt1312 g17 15 ?0 0 20 c out = 1? c out = 10?
5 lt1312 at 2.4v. the input thresholds are compatible with cmos controllers and can be driven from either 5v or 3.3v cmos logic. esd protection diodes limit input excursions to 0.6v below ground. valid output pin: this pin is an open-collector npn output which is driven low when the vpp out pin is in regulation, i.e., when it is above 11v. an external 51k pull- up resistor is connected between this output and the same 5v or 3.3v logic supply powering the pcmcia compatible control logic. v cc sense pin: a built-in comparator and 4v reference automatically switches the vpp out from 5v to 3.3v de- pending upon the voltage sensed at the pcmcia card socket v cc pin. the input current for this pin is approxi- mately 30 m a. for 5v only operation, connect the sense pin directly to ground. an esd protection diode limits the input voltage to 0.6v below ground. pi n fu n ctio n s uuu supply pin: power is supplied to the device through the supply pin. the supply pin should be bypassed to ground if the device is more than 6 inches away from the main supply capacitor. a bypass capacitor in the range of 0.1 m f to 1 m f is sufficient. the supply voltage to the lt1312 can be loosely regulated between 13v and 20v. see applica- tions information section for more detail. vpp out pin: this regulated output supplies power to the pcmcia card vpp pins which are typically tied together at the card socket. the vpp out output is current limited to approximately 330ma. thermal shutdown provides a second level of protection. a 1 m f to 10 m f tantalum output capacitor is recommended. see applications informa- tion section for more detail on output capacitor consid- erations. input enable pins: the two digital input pins are high impedance inputs with approximately 20 m a input current block diagra m w + + vpp out v cc sense v s en0 en1 valid lt1312 bd 11v low dropout linear regulator voltage logic control 4v
6 lt1312 voltage control logic: the lt1312 has five possible output modes: 0v, 3.3v, 5v, 12v and hi-z. these five modes are selected by the two enable inputs and the v cc sense input as described by the truth table. v cc sense comparator: when the v cc mode is selected, the lt1312 automatically adjusts the regulated vpp out- put voltage to 3.3v or 5v depending upon the voltage present at the pc card v cc supply pin. the threshold voltage for the comparator is set at 4v and there is approximately 50mv of hysteresis provided to ensure clean switching between 3.3v and 5v. vpp valid comparator: a voltage comparator monitors the output voltage when the 12v mode is selected and is driven low when the output is in regulation above 11v. applicatio n s i n for m atio n wu u u operatio n u the lt1312 is a programmable output voltage, low- dropout linear regulator designed specifically for pcmcia vpp drive applications. input power is typically obtained from a loosely regulated input supply between 13v and 20v (see applications information section for more detail on the input power supply). the lt1312 consists of the following blocks: low dropout voltage linear regulator: the heart of the lt1312 is a pnp-based low-dropout voltage regulator which drops the unregulated supply voltage from 13v to 20v down to 12v, 5v, 3.3v, 0v or hi-z depending upon the state of the two enable inputs and the v cc sense input. the regulator has built-in current limiting and thermal shut- down to protect the device, the load, and the socket against inadvertent short circuiting to ground. the lt1312 is a voltage programmable linear regulator designed specifically for pcmcia vpp driver applications. the device operates with very low quiescent current (30 m a) in the 0v and hi-z modes of operation. in the hi-z mode, the output leakage current falls to 1 m a. unloaded quiescent current rises to only 55 m a and 75 m a when programmed to 3.3v and 5v respectively. in addition to the low quiescent currents, the lt1312 incorporates sev- eral protection features which make it ideal for pcmcia applications. the lt1312 has built-in current limiting (330ma) and thermal shutdown to protect the device and the socket vpp pins against inadvertent short-circuit conditions. auxiliary winding power supplies because the lt1312 provides excellent output regulation, the input power supply may be loosely regulated. one convenient (and economic) source of power is an auxiliary winding on the main 5v switching regulator inductor in the main system power supply. ltc ? 1142hv auxiliary winding power supply figure 1 is a schematic diagram which describes how a loosely regulated 14v power supply is created by adding burst mode is a trademark of linear technology corporation. an auxiliary winding to the 5v inductor in a split 3.3v/5v ltc1142hv power supply system. a turns ratio of 1:1.8 is used for transformer t1 to ensure that the input voltage to the lt1312 falls between 13v and 20v under all load conditions. the 9v output from this additional winding is rectified by diode d2, added to the main 5v output and applied to the input of the lt1312. (note that the auxiliary winding must be phased properly as shown in figure 1.) the auxiliary winding is referenced to the 5v output which provides dc current feedback from the auxiliary supply to the main 5v section. the ac transient response is im- proved by returning the negative lead of c5 to the 5v output as shown. when the 12v output is activated by a ttl high on the enable line, the 5v section of the ltc1142hv is forced into continuous mode operation. a resistor divider composed of r2, r3 and switch q3 forces an offset which is sub- tracted from the internal offset at the sense C input (pin 14) of the ltc1142hv. when this external offset cancels the built-in 25mv offset, burst mode tm operation is inhibited and the ltc1142hv is forced into continuous mode operation. (see the ltc1142hv data sheet for further detail). in this mode, the 14v auxiliary supply can be
7 lt1312 applicatio n s i n for m atio n wu u u d1 mbrs140 d3 mbrs130t3 d2 mbrs140 q3 vn7002 v in 6.5v to 18v c4 1000pf c2 1000pf c3 220? c1 68? c5 22? 1? 5v output q1 10 9 20 15 14 en0 en1 valid *lpe-6562-a026 dale (605) 665-9301 14v auxiliary supply t1 1.8t 30?* q2 r4 22 w r1 100 w r3 18k r2 100 w r5 0.033 w lt1312 f1 + + + v s en0 to card vpp pin 0v, 3.3v, 5v, 12v or hi-z from card v cc pin vpp out lt1312 en1 valid sense gnd + v in pdrive ndrive sense + sense 1/2 ltc1142hv 5v reg loaded without regard to the loading on the 5v output of the ltc1142hv. continuous mode operation is only invoked when the lt1312 is programmed to 12v. if the lt1312 is pro- grammed to 0v, 3.3v or 5v, power is obtained directly from the main power source (battery pack) through diode d1. again, the lt1312 output can be loaded without regard to the loading of the main 5v output. r4 and c4 absorb transient voltage spikes associated with the leakage inductance inherent in t1's secondary winding and ensure that the auxiliary supply does not exceed 20v. figure 2 is a graph of output voltage versus output current for the auxiliary 14v supply shown in figure 1. note that the auxiliary supply voltage is slightly higher when the 5v output is heavily loaded. this is due to the increased energy flowing through the main 5v inductor. ltc1142 auxiliary power from the 3.3v output the circuit of figure 1 can be modified for operation with low-battery count applications (6 cell). as the input volt- age falls, the 5v duty cycle increases to the point where there is simply not enough time to transfer energy from the 5v primary to the auxiliary winding. for applications where heavy 12v load currents exist in conjunction with low input voltages (<6.5v), the auxiliary winding can be derived from the 3.3v section instead of the 5v section of the ltc1142. in this case, a transformer with a turns ratio of 1:3.4 to 1:3.6 should be used in place of the 3.3v section auxiliary output current (ma) 0.1 11 auxiliary output voltage (v) 15 16 17 10 1 100 1000 lt1312 f2 14 13 12 v in = 8v en0 = hi i out5v = 1a i out5v = 0ma figure 2. ltc1142 auxiliary supply voltage figure 1. deriving 14v power from an auxiliary winding on the ltc1142hv 5v regulator
8 lt1312 applicatio n s i n for m atio n wu u u on this line that may damage sensitive pcmcia flash memory cards if applied directly to the vpp pins. flash memory card vpp power considerations pcmcia compatible flash memory cards require tight regulation of the 12v vpp programming supply to ensure that the internal flash memory circuits are never subjected to damaging conditions. flash memory circuits are typi- cally rated with an absolute maximum of 13.5v and vpp must be maintained at 12v 5% under all possible load conditions during erase and program cycles. undervoltage can decrease specified flash memory reliability and over- voltage can damage the device 1 . generating 14v from 5v or 12v it is important that the 12v vpp supply for the two vpp lines to the card be free of voltage spikes. there should be little or no overshoot during transitions to and from the 12v level. inductor as shown in figure 3. mosfet q4 and diode d4 have been added and diode d1 is no longer used. in the previous circuit, power is drawn directly from the batteries through d1, when the ltc1142 is in burst mode operation and the vpp pin requires 3.3v or 5v. for these lower input voltages this technique is no longer valid as the input will fall below the lt1312 regulators dropout voltage. to correct for this situation, the additional switch q4 forces the switching regulator into continuous mode operation whenever 3.3v, 5v or 12v is selected. line powered supplies in line operated products such as: desktop computers, dedicated pc card readers/writers, medical equipment, test and measurement equipment, etc., it is possible to derive power from a relatively raw source such as a 5v or 12v power supply. the 12v supply line in a desktop computer however, is usually too dirty to apply directly to the vpp pins of a pcmcia card socket. power supply switching and load transients may create voltage spikes 1 see application note ap-357, power supply solutions for flash memory, intel corporation, 1992. d2 mbrs1100 d3 mbrs130t3 q3 vn7002 v in 5.4v to 12v c4 1000pf c2 1000pf c3 220? c1 68? c5 22? 3.3v output from card v cc pin q1 24 23 6 1 28 en0 en1 valid *lpe-6582-a086 dale (605) 665-9301 14v auxiliary supply t1 3.38t 22?* q2 r4 22 w r1 100 w r3 18k r2 100 w r4 0.033 w d4 18v lt1312 f3 + q4 vn7002 + + + v s en0 to card vpp pin 0v, 3.3v, 5v, 12v or hi-z vpp out lt1312 en1 valid sense gnd 1? 1/2 ltc1142 3.3v reg v in pdrive ndrive sense + sense figure 3. deriving auxiliary 14v power from an ltc1142 3.3v regulator
9 lt1312 applicatio n s i n for m atio n wu u u v s en0 vpp out lt1312 en1 valid sense gnd v in v sw lt1172 fb gnd v c + 1 m f lt1312 f4 100 m f 1n5158 13.75v 100 m h 10k 1% 1 2 4 5 3 1k 1% to card vpp pin 0v, 5v, 12v or hi-z + 22 m f 5v + 1 m f + 1k figure 7. using a 0.33 m f to 1 m f output capacitor figure 4. local 5v to 15v boost regulator for line operated applications v s en0 vpp out lt1312 en1 valid sense gnd 0.33 m f ceramic lt1312 f7 0.1 m f 2 w 13v to 20v figure 6. recommended >1 m f tantalum output capacitor v s en0 vpp out lt1312 en1 valid sense gnd + >1 m f tantalum or aluminum lt1312 f6 0.1 m f 13v to 20v v s en0 vpp out lt1312 en1 valid sense gnd v in sw1 i lim lt1111cs8 sense gnd sw2 + 1 m f lt1312 f5 100 m f 1n5158 13.75v 100 m h 100k 1% 4 8 3 1 2 5 10k 1% to card vpp pin 0v, 5v, 12v or hi-z 100 w + 22 m f 12v + this is easily accomplished by generating a local 14v supply from a relatively dirty 5v or 12v supply as shown in figures 4 and 5. precise voltage control (and further filtering) is provided by the lt1312 driver/regulator. a further advantage to this scheme is that it adds current limit in series with the vpp pins to eliminate possible damage to the card socket, the pc card, or the switching power supply in the event of an accidental short circuit. output capacitance the lt1312 is designed to be stable with a wide range of output capacitors. the minimum recommended value is a 1 m f with an esr of 3 w or less. the capacitor is connected directly between the output pin and ground as shown in figure 6. for applications where space is very limited, capacitors as low as 0.33 m f can be used. extremely low esr ceramic capacitors with values less than 1 m f must have a 2 w resistor added in series with the output capacitor as shown in shown in figure 7. figure 5. local 12v to 15v boost regulator for line operated applications
10 lt1312 applicatio n s i n for m atio n wu u u table 1. s8 package* copper area thermal resistance topside backside board area (junction-to-ambient) 2500 sq mm 2500 sq mm 2500 sq mm 120 c/w 1000 sq mm 2500 sq mm 2500 sq mm 120 c/w 225 sq mm 2500 sq mm 2500 sq mm 125 c/w 1000 sq mm 1000 sq mm 1000 sq mm 131 c/w *device is mounted topside. calculating junction temperature example: given an output voltage of 12v, an input supply voltage of 14v, an output current of 100ma, and a maximum ambient temperature of 50 c, what will the maximum junction temperature be? power dissipated by the device will be equal to: i out (v s C vpp out ) + (i gnd v in ) where: i out = 100ma v in = 14v i gnd at (i out = 100ma, v in = 14v) = 5ma so, p d = 100ma (14v C 12v) + (5ma 15v) = 0.275w using table 1, the thermal resistance will be in the range of 120 c/w to 131 c/w depending upon the copper area. so the junction temperature rise above ambient will be less than or equal to: 0.275w 131 c/w = 36 c the maximum junction temperature will then be equal to the junction temperature rise above ambient plus the maximum ambient temperature or: t jmax = 50 c + 36 c = 86 c. transient and switching performance the lt1312 is designed to produce minimal overshoot with capacitors in the range of 1 m f to 10 m f. larger capacitor values can be used with a slowing of rise and fall times. the positive output slew rate is determined by the 330ma current limit and the output capacitor. the rise time for a 0v to 12v transition is approximately 40 m s, the rise time for a 10 m f capacitor is roughly 400 m s (see the transient response curves in the typical performance characteris- tics section). the fall time from 12v to 0v is set by the output capacitor and an internal pull-down current source which sinks about 30ma. this source will fully discharge a 1 m f capaci- tor in less than 1ms. thermal considerations power dissipated by the device is the sum of two compo- nents: output current multiplied by the input-output differ- ential voltage i out (v in C v out ), and ground pin current multiplied by supply voltage i gnd v in . the ground pin current can be found by examining the ground pin current curves in the typical performance characteristics section. heat sinking, for surface mounted devices, is accom- plished by using the heat spreading capabilities of the pc board and its copper traces. the junction temperature of the lt1312 must be limited to 125 c to ensure proper operation. use table 1 in conjunc- tion with the typical performance graphs, to calculate the power dissipation and die temperature for a particular application and ensure that the die temperature does not exceed 125 c under any operating conditions.
11 lt1312 single slot interface to cl-pd6710 vpp1 vpp2 pcmcia card slot v cc lt1312 ta2 5v sense vpp out gnd lt1312 v s valid en0 en1 13v to 20v 51k v logic 3.3v 3.3v or 5v 10 m f + 1 m f v cc a_vpp_pgm a_vpp_v cc vpp_valid a_v cc _5 a_v cc _3 cirrus logic cl-pd6710 si9430dy or mmsf3p02hd si9933dy or mmdf2p01hd + vpp1 vpp2 pcmcia card slot g2 g1 gnd ltc1157cs8 v s v cc lt1312 ta3 in2 in1 + 5v sense vpp out gnd lt1312 v s valid en0 en1 13v to 20v 51k v logic 3.3v 10 m f + 1 m f 3.3v or 5v v cc a_vpp_en0 a_vpp_en1 a_v cc _en0 a_v cc _en1 a:gpi ?65?type controller si9410dy or mmsf5n02hd si9956dy or mmdf3n02hd single slot interface to 365 type controller typical applicatio n s u information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
12 lt1312 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7487 (408) 432-1900 l fax : (408) 434-0507 l telex : 499-3977 lt/gp 0894 10k ? printed in usa ? linear technology corporation 1994 package descriptio n u dimensions in inches (millimeters) unless otherwise noted. s8 package 8-lead plastic soic 1 2 3 4 0.150 ?0.157* (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) 0.016 ?0.050 0.406 ?1.270 0.010 ?0.020 (0.254 ?0.508) 45 0 8?typ 0.008 ?0.010 (0.203 ?0.254) so8 0294 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) bsc *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.006 inch (0.15mm). related parts see pcmcia product family table on the first page of this data sheet.

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