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| STCL132K 32,768 Hz silicon oscillator Features Fixed frequency 32,768 Hz 1.0% (0 to 70 C), 1.2% (-30 to 85 C) frequency accuracy over all conditions 1.65 to 1.95 V, 2.7 to 3.6 V operation Low operating current, ultra low standby current Push-pull, CMOS compatible frequency (square wave) output Chip enable input, active high, internal 150 k pull-down Fast and stable startup No external components required Temperature range: -30 to +85 C Package: SC70-5L RoHS compliant SOT323-5 (SC70-5L) (W8) Applications Low-speed microprocessor clock Display drivers Any application with multiple inputs sharing a common clock source Description The STCL132K silicon oscillator devices are reliable, easy to use, 5-pin low-cost silicon oscillators developed primarily for microprocessor clock applications, display drivers or other system applications where tighter clock accuracy is not critical. Compared to crystal oscillators, silicon oscillators offer the advantages of faster startup, smaller size and improved immunity to shock, vibration and EMI. The STCL132K silicon oscillator devices are equipped with chip enable input, offering an easy way to stop microprocessor clocking during a power saving mode while at the same time significantly reducing the oscillator current consumption. April 2008 Rev 5 1/20 www.st.com 1 Contents STCL132K Contents 1 2 3 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 3.2 3.3 Chip enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Transition to disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Fast startup and stable wakeup from disable . . . . . . . . . . . . . . . . . . . . . . . 7 4 5 6 7 8 9 10 11 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Typical operating characteristics and scope plots . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Package details SC70-5L (RoHS compliant) . . . . . . . . . . . . . . . . . . . . . 16 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 STCL132K List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DC and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 SC70-5L - 5-lead small outline transistor package mechanical data . . . . . . . . . . . . . . . . . 15 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3/20 List of figures STCL132K List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. SC70-5L pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Microprocessor (MCU, microcontroller unit) clock - replacement of a 32 KHz crystal . . . . . 6 Frequency vs. temperature (STCL132KRxxx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Duty cycle vs. temperature (STCL132KRxxx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Active supply current vs. temperature (STCL132KRxxx) . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Standby supply current vs. temperature (STCL132KRxxx) . . . . . . . . . . . . . . . . . . . . . . . . 12 Startup time vs. temperature (STCL132KRxxx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Startup output waveform: already the first cycle is within specifications (power-on, VCC = 1.8 V, STCL132KRxxx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 SC70-5L - 5-lead small outline transistor package outline. . . . . . . . . . . . . . . . . . . . . . . . . 14 Parts orientation in reel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Reel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4/20 STCL132K Pin descriptions 1 Pin descriptions Figure 1. SC70-5L pin connections CE 1 5 VCC NC FOUT 2 3 4 GND AI12658 Table 1. Symbol VCC FOUT CE GND NC Signal names Description Positive supply voltage pin Frequency (square wave) output, CMOS compatible, push-pull Chip Enable input, CMOS level, active high, internal 150 k pull-down resistor Ground No Connect 5/20 Typical application circuit STCL132K 2 Figure 2. Typical application circuit Microprocessor (MCU, microcontroller unit) clock - replacement of a 32 KHz crystal MCU I/O CE (2) 1 5 VCC VCC NC Xtal1 (OSC1, OSCin) Xtal2 (OSC2, OSCout) FOUT 2 STCL132K GND 0.1 F (1) 3 4 GND NC AI12659a 1. For reliable operation and to further improve immunity to harsh environment, the minimum 0.1 F decoupling capacitor is recommended to be placed as close as possible to the VCC and GND pins of the oscillator device. The whole oscillator block should then be placed near the microprocessor clock input. 2. Internal 150 k pull-down resistor is implemented on the CE input. If the chip enable feature is not used, in active mode connect the CE pin to VCC. In applications utilizing standby mode and where the CE pin is connected to the controlling I/O port of the clocked microprocessor, for successful startup of the microprocessor at power-on, initial logic high level needs to be secured on the CE pin to ensure clocking occurs during the power-on reset until the microprocessor program starts and the controlling I/O port takes over the CE control. 6/20 STCL132K Operation 3 Operation Use of the STCL132K silicon oscillator device is very simple. Once power is applied to VCC pin, a CMOS-compatible square wave output signal is provided on the FOUT output pin (in active mode the Chip Enable (CE) input pin must be at a logic high level). 3.1 Chip enable This feature allows the user to stop the clock and significantly reduce the current consumption when the application is put into power saving mode. When used to clock the microprocessor in place of a crystal, the need for chip enable input stems from a difference in the way microprocessors normally disable their clock. In the case of a crystal or ceramic resonator, when going into power saving mode, the processor simply opens the internal Xtal inverter feedback which results in stopping the crystal oscillations; however in the case of the silicon oscillators this would not work and the oscillator would continue to run. So in order to use this feature, one of the microprocessor's output pins must be configured to control the silicon oscillator's Chip Enable (CE) input, see typical application circuit diagram in Figure 2. 3.2 Transition to disable At the moment when the Chip Enable (CE) input goes low, the oscillator's output FOUT will immediately go low; then during the disable period the output remains low. Note: For advanced microprocessor applications, other disable modes can be made available as a product option (FOUT completes the last clock period, and then remains low or provides 32 additional cycles before going low to allow the processor to complete the pipelined instructions, etc.). Also, a product option with output in a high-impedance state to allow the system to alternate between several oscillators connected in parallel can be made available. Contact local ST sales office for availability. 3.3 Fast startup and stable wakeup from disable The total startup time until oscillations internally stabilize and remain within specifications is typically 90 s, i.e. shorter than duration of the first three periods of the generated output signal, see Section 5: DC and AC parameters. This means that 90 s after power-on or wakeup from disable a first valid period of the output signal occurs on the FOUT pin and is within the specified frequency and duty cycle range (in the meantime the output remains low). This is in comparison to typically milliseconds for crystal oscillators. 7/20 Maximum rating STCL132K 4 Maximum rating Stressing the device above the rating listed in Table 2: Absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE program and other relevant quality documents. Table 2. Symbol TSTG TSLD(1) VI VCC ESD - MM ESD - HBM ESD - CDM Absolute maximum ratings Parameter Storage temperature (VCC off) Lead solder temperature for 10 seconds Input voltage Supply voltage Machine Model JESD22-A115-A level A(2) Value -55 to 150 260 -0.3 to VCC +0.3 -0.3 to 4.6 100 2 1 Unit C C V V V kV kV Human Body Model JESD22-A114-B level 2(2) Charged Device Model(2) 1. Reflow at peak temperature of 260 C (total thermal budget not to exceed 245 C for more than 30 seconds). 2. For all external pins. 8/20 STCL132K DC and AC parameters 5 DC and AC parameters This section summarizes the operating and measurement conditions, as well as the DC and AC characteristics of the device. The parameters in the following DC and AC characteristic Table 4 are derived from tests performed under the measurement conditions listed in the Table 3. Designers should check that the operating conditions in their projects match the measurement conditions when using the quoted parameters. Table 3. DC and AC measurement conditions(1) Parameter VCC supply voltage Ambient operating temperature Load capacitance (CL) 1. Unless otherwise specified. STCL132KRxxx 1.65 to 1.95 V 0 to 70 C, -30 to +85 C 12 pF STCL132KWxxx 2.7 to 3.6 V 0 to 70 C, -30 to +85 C 12 pF 9/20 DC and AC parameters Table 4. Symbol VCC STCL132K DC and AC parameters Description Operating voltage STCL132KWxxx VCC = 1.65 to 1.95 V, (STCL132KRxxx) output unloaded 2.7 60 3.6 85 V A Test condition STCL132KRxxx Min 1.65 Typ Max 1.95 Unit V ICC Operating current VCC = 2.7 to 3.6 V, (STCL132KWxxx) output unloaded Standby current Output voltage low Output voltage high Input low voltage (CE) Input high voltage (CE) Internal pull-down resistor VCC = 1.65 to 1.95 V, -30 to +85 C (STCL132KRxxx) VCC = 1.65 to 1.95 V, 0 to +70 C (STCL132KRxxx) VCC = 2.7 to 3.6 V, -30 to +85 C (STCL132KWxxx) VCC = 2.7 to 3.6 V, 0 to +70 C (STCL132KWxxx) Frequency temperature coefficient Jitter Duty cycle Cycle-to-cycle, over 20 s Taken at half of the signal amplitude From the point when VCC reached min operating voltage or CE went high until valid output signal occurs on the F OUT pin (in the meantime output remains low) CL = 12 pF; 10 to 90 % of the amplitude 45 -1.2 -1.0 -1.2 -1.0 -150 150 50 55 0.65 VCC 150 +1.2 +1.0 +1.2 +1.0 +180 CE 85 105 1 0.2 VCC VCC - 0.2 V 0.35 V CC A A V V V V k % % % % ppm/C nsP-P % ICC2 VOL VOH VIL VIH RPD = GND IOL = 2 mA IOH = -2 mA Frequency accuracy(1) tSTART Startup time 90 120 s tR, tF CL Rise/fall time Load capacitance 10 12 ns pF 1. Typical frequency shift due to aging is 0.2%. Aging stresses include one solder reflow (260 C peak) and 1000 hrs VCC biased, 125 C op-life. 10/20 STCL132K Typical operating characteristics and scope plots 6 Figure 3. Typical operating characteristics and scope plots Frequency vs. temperature (STCL132KRxxx) 32.90 32.80 32.70 Mean frequency 32.60 (kHz) 32.50 32.40 32.30 -40 -20 0 20 40 60 80 100 120 140 Temperature (C) VCC = 1.65 V VCC = 1.8 V VCC = 1.95 V AI14577 Figure 4. Duty cycle vs. temperature (STCL132KRxxx) 53 52 Mean duty cycle (%) 51 50 49 48 47 -40 -20 0 20 40 60 80 100 120 140 Temperature (C) VCC = 1.65 V VCC = 1.8 V VCC = 1.95 V AI14578 11/20 Typical operating characteristics and scope plots STCL132K Figure 5. Active supply current vs. temperature (STCL132KRxxx) 70 60 50 Mean ICC (A) 40 30 20 10 0 -40 -20 0 20 40 60 80 100 120 140 Temperature (C) VCC = 1.65 V VCC = 1.8 V VCC = 1.95 V AI14579 Figure 6. Standby supply current vs. temperature (STCL132KRxxx) 100 90 80 70 60 Mean ICC standby (nA) 50 40 30 20 10 0 -40 -20 0 20 40 60 80 100 120 140 Temperature (C) VCC = 1.65 V VCC = 1.8 V VCC = 1.95 V AI14580 12/20 STCL132K Typical operating characteristics and scope plots Figure 7. Startup time vs. temperature (STCL132KRxxx) 70 60 50 Mean startup time (s) 40 30 20 10 0 -40 -20 0 20 40 60 80 100 120 140 Temperature (C) VCC = 1.65 V VCC = 1.8 V VCC = 1.95 V AI14581 Figure 8. Startup output waveform: already the first cycle is within specifications (power-on, V CC = 1.8 V, STCL132KRxxx) 13/20 Package mechanical data STCL132K 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 9. SC70-5L - 5-lead small outline transistor package outline SOT323-5L 1. Drawing is not to scale. 14/20 STCL132K Table 5. Symbol Typ A A1 A2 b C D E E1 e e1 L s -- -- 0.90 -- -- 2.00 2.10 1.25 0.65 1.30 0.36 -- Min 0.80 0 -- 0.15 0.10 1.80 1.80 1.15 -- -- 0.26 0 Max 1.10 0.10 -- 0.30 0.20 2.20 2.40 1.35 -- -- 0.46 5 Typ -- -- 0.035 -- -- 0.079 0.083 0.049 0.026 0.051 0.014 -- Package mechanical data SC70-5L - 5-lead small outline transistor package mechanical data mm Inches Min 0.031 0 -- 0.006 0.004 0.071 0.071 0.045 -- -- 0.010 0 Max 0.043 0.004 -- 0.012 0.008 0.087 0.094 0.053 -- -- 0.018 5 15/20 Package details SC70-5L (RoHS compliant) STCL132K 8 Package details SC70-5L (RoHS compliant) Tape and reel specifications according to EIA-481B standard: Figure 10. Parts orientation in reel Sprocket hole Cavity 5 4 5 4 Direction of feed 1 2 3 1 2 3 AI14588 Pin 1 located opposite to sprocket hole (lower left corner / quadrant 3 with reference to EIA-481B standard). Figure 11. Reel Tapeslot Trailer Leader AI14589 Leader length = 500 mm minimum Trailer length = 160 mm minimum Peel strength: conforms to EIA 481 standard Min: 10 gm Max: 130 gm 16/20 STCL132K Part numbering 9 Table 6. Part numbering Ordering information scheme STCL 1 32K R D E A W8 9 Device type STCL = Silicon oscillator Product family 1 = Single frequency, fixed Frequency 32K = 32.768 kHz Operating voltage R = 1.65 to 1.95 V W = 2.7 to 3.6 V (1) Accuracy D = 1.2% Chip enable(2) E = Single chip enable, active high, pull-down Disable mode(2) A = Immediate disable, output low during disable, output low during startup Package(3) W8 = SOT323-5 (SC70-5) Temperature range 9 = -30 to +85 C 1. Contact local ST sales office for availability of the 3 V VCC range ("W") version. 2. Contact local ST sales office for availability of other product options (chip enable active high or low, with or without internal pull-up or pull-down, possibility of various disable modes, startup procedures, output low or in high-impedance when disabled, etc.). 3. The shipping method is tape and reel only in ECOPACK(R) packages. 17/20 Package marking STCL132K 10 Package marking Table 7. Package marking Part number STCL 1 32K R D E A W8 9 STCL 1 32K W D E A W8 9 VCC range 1.65 to 1.95 V 2.7 to 3.6 V Topside marking(1) 32Ax 32Dx 1. x = letter assigned to indicate assembly work week (i.e., A = WW01 and WW02, B = WW03 and WW04, C = WW05 and WW06..., Z = WW51, WW52, and WW53). 18/20 STCL132K Revision history 11 Revision history Table 8. Date 23-May-2007 09-Aug-2007 Document revision history Revision 1 2 Initial release. Updated cover page; frequency accuracy in Table 4; Section 7: Package mechanical data; and Section 9: Part numbering. Document reformatted, added STCL132KWxxx device and commercial temperature range, Chapter 10, updated Chapter 6, Chapter 8, Table 3 and 4, Figure 10 and 11, Chapter 9. Updated cover page, Table 2, 6, 7, and Figure 2, 8; minor text change. Changed status for STCL132K, added note below Table 6. Changes 28-Feb-2008 19-Mar-2008 24-Apr-2008 3 4 5 19/20 STCL132K Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 20/20 |
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