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INTEGRATED CIRCUITS
CBT6820 20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
Product specification Supersedes data of 1999 Apr 05 2000 Jun 19
Philips Semiconductors
Philips Semiconductors
Product specification
20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
CBT6820
FEATURES
* TTL compatible inputs and outputs * 5 switch connection between two port A and port B * Thin shrink small outline (TSSOP) * Undershoot protection included to prevent shoot through level
changes
PIN CONFIGURATION
BIASV 1 1A1 2 1A2 3 1A3 4 1A4 5 1A5 6 1A6 7 GND 8 1A7 9
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
1OE 2OE 1B1 1B2 1B3 1B4 1B5 GND 1B6 1B7 1B8 1B9 1B10 2B1 2B2 2B3 GND 2B4 2B5 2B6 2B7 2B8 2B9 2B10
* Bias voltage pre-charges the outputs to minimize signal distortion
during live insertion
* Latch-up protection exceeds 500 mA per JESD78 * ESD protection exceeds 2000 V HBM per JESD22-A114,
200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
DESCRIPTION
The CBT6820 provides twenty bits of high-speed TTL-compatible bus switching. The low on-state resistance of the switch allows bi-directional connections to be made while adding near-zero propagation delay. The device also precharges the B port to a user-selectable bias voltage (BIASV) to minimize live-insertion noise. The device is organized as two 10-bit switch with individual enable (OE) input. When OE is low, the switch is on and port A is connected to port B. When OE is high, the switch between port A and port B is open and the B port is precharged to BIASV through the equivalent of a 10 k resistor. Special clamp circuitry and Schottky diode clamps to ground are used to prevent an under voltage on the A side (Vin < GND) from causing the B side precharge voltage to drop below the ``1" state.
1A8 10 1A9 11 1A10 12 2A1 13 2A2 14 VCC 15 2A3 16 GND 17 2A4 18 2A5 19 2A6 20 2A7 21 2A8 22 2A9 23 2A10 24
SA00520
QUICK REFERENCE DATA
SYMBOL tPLH/tPHL CIN CI/O PARAMETER Propagation delay An to Bn or Bn to An Input capacitance Input/output capacitance Outputs disabled; VO = 0 V or VCC CONDITIONS Tamb = 25C; GND = 0V CL = 50 pF, VCC = 5 V TYPICAL 0.25 4.5 9.5 UNIT ns pF pF
ORDERING INFORMATION
PACKAGES 48-Pin Plastic TSSOP Type II TEMPERATURE RANGE -40C to +85C ORDER CODE CBT6820 DGG DWG NUMBER SOT362-1
2000 Jun 19
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853-2152 23904
Philips Semiconductors
Product specification
20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
CBT6820
PIN DESCRIPTION
PIN NUMBER 1 2, 3, 4, 5, 6, 7, 9, 10, 11,12 8, 17, 32, 41 13, 14, 16, 18, 19, 20, 21, 22, 23, 24 15 35, 34, 33, 31, 30, 29, 28, 27, 26, 25 46, 45, 44, 43, 42, 40, 39, 38, 37, 36 48, 47 SYMBOL BIASV 1A1-1A10 GND 2A1-2A10 VCC 2B1-2B10 1B1-1B10 1OE, 2OE NAME AND FUNCTION Precharge bias voltage input Port 1A1 to Port 1A10 Ground (V) Port 2A1 to Port 2A10 Positive supply voltage Port 2B1 to Port 2B10 Port 1B1 to Port 1B10 Switch enables
LOGIC SYMBOL
1 BIASV
2, 13 xA1
46, 35
xB1
12, 24 xA10
36, 25
xB10
FUNCTION TABLE
OE L H H H = High voltage level L = Low voltage level Z = High impedance "off " state STATE
48, 47
A Port = B Port A Port = Z
xOE
where x = 1 - 2
B Port = BIASV
SA00506
ABSOLUTE MAXIMUM RATINGS
SYMBOL VCC IIK VI ISW VBIASV Tstg oJA PARAMETER DC supply voltage DC clamp diode current DC input voltage1 VO = 0 to VCC VI < 0 CONDITIONS RATING -0.5 to +7.0 -50 -0.5 to +7.0 128 -0.5 to +7.0 -65 to 150 104 UNIT V mA V mA V C C/W
DC continuous channel current DC bias voltage Storage temperature range Plastic thin shrink small outline package (TSSOP)
NOTE: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
RECOMMENDED OPERATING CONDITIONS
LIMITS SYMBOL VCC BIASV VIH VIL Tamb DC supply voltage DC supply voltage High-level input voltage (control pin) Low-level Input voltage (control pin) Operating free-air temperature range -40 PARAMETER Min 4.0 1.3 2.0 0.8 +85 Max 5.5 VCC V V V V C UNIT
2000 Jun 19
3
Philips Semiconductors
Product specification
20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
CBT6820
DC ELECTRICAL CHARACTERISTICS
LIMITS SYMBOL PARAMETER TEST CONDITIONS Tamb = -40C to +85C Min VIK II IO ICC ICC CI CO(OFF) ron3 Input clamp voltage Input leakage current (control pin) Output bias current (B pins) Quiescent supply current Control pins2 Input capacitance per OE pin Capacitance per port (OFF-state) VCC = 4.5V; II = -18mA VCC = 5.5V; VI = GND or 5.5V VCC = 4.5V; BiasV = 2.4V; VO = 0, OE = VCC VCC = 5.5V; IO = 0, VI = VCC or GND VCC = 5.5V, one input at 3.4V, other inputs at VCC or GND VI= 3V or 0 VO = 3V or 0; switch off VCC = 4.5V; VI = 0V; II = 64mA On-resistance VCC = 4.5V; VI = 0V; II = 30mA VCC = 4.5V; VI = 2.4V; II = -15mA VP IUSP Pass voltage Undershoot static current protection4 VIN = VCC = 4.5V; Iout = -100A VCC = 5.0V, VBias = VCC IB = -5A, VB 3.0V 3.4 4.5 9.5 5 5 10 3.6 -10 7 7 15 3.9 V mA Typ1 Max -1.2 5 -0.25 2.5 2.5 V A mA mA mA pF pF UNIT
NOTES: 1. All typical values are at VCC = 5V, TA = 25 C 2. This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND 3. Measured by the voltage drop between the A and the B terminals at the indicated current through the switch. On-state resistance is determined by the lowest voltage of the two (A or B) terminals. 4. Force IUSP, measure VB 3V
2000 Jun 19
4
Philips Semiconductors
Product specification
20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
AC CHARACTERISTICS FOR VCC = 5.0V 0.5V RANGE
GND = 0V; tr = tf 2.5ns; CL = 50pF. SYMBOL tpd tPZH tPZL tPHZ tPLZ LIMITS PARAMETER Propagation delay; An to Bn; Bn to An2 3-State output enable time OE to An; OE to Bn; BIASV = GND 3-State output enable time OE to An; OE to Bn; BIASV = 3.0V 3-State output enable time OE to An; OE to Bn; BIASV = GND 3-State output enable time OE to An; OE to Bn; BIASV = 3.0V WAVEFORM MIN 1 2 2 2 2 1.3 1.4 1.7 2.8 3.1 2.9 2.8 4.4 Tamb = -40 to +85C TYP1
CBT6820
UNIT ns ns ns ns ns
MAX 0.25 5.3 4.6 4.5 6.6
NOTE: 1. All typical values are measured at Tamb = 25C and VCC = 5.0V 2. Warranted but not production tested. The propagation delay is based on the RC time constant of the typical ON-state resistance of the switch and a load capacitance of 50pF, when driven by an ideal voltage source (zero output impedance)
AC WAVEFORMS
VM = 1.5V, VIN = GND to 3.0V
3V 1.5V INPUT 0V tPLH tPHL VOH 1.5V OUTPUT VOL 1.5V 1.5V
TEST CIRCUIT AND WAVEFORMS
7V From Output Under Test CL = 50 pF 500 S1 Open GND 500
Load Circuit
TEST tpd tPLZ/tPZL tPHZ/tPZH
S1 open 7V open
SA00028
Waveform 1. Waveforms Showing the Input (An) to Output (Bn) Propagation Delays
DEFINITIONS Load capacitance includes jig and probe capacitance; CL = see AC CHARACTERISTICS for value.
3V Output Control (Low-level enabling tPZL Output Waveform 1 S1 at 7 V (see Note) tPZH Output Waveform 2 S1 at Open (see Note) 1.5 V 1.5 V 0V 3.5V 1.5 V tPHZ VOH - 0.3V 1.5 V 0V Note: Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
SA00012
tPLZ
NOTES: 1. All input pulses are supplied by generators having the following characteristics: PRR 10 MHz, ZO = 50 , tr 2.5 ns, tf 2.5 ns. 2. The outputs are measured one at a time with one transition per measurement.
VOL + 0.3V VOL VOH
SA00029
Waveform 2. Waveforms Showing the 3-State Output Enable and Disable Times
2000 Jun 19
5
Philips Semiconductors
Product specification
20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
CBT6820
TSSOP48: plastic thin shrink small outline package; 48 leads; body width 6.1mm
SOT362-1
2000 Jun 19
6
Philips Semiconductors
Product specification
20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
CBT6820
NOTES
2000 Jun 19
7
Philips Semiconductors
Product specification
20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
CBT6820
Data sheet status
Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product.
Production
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 2000 All rights reserved. Printed in U.S.A. print code Document order number: Date of release: 06-00 9397 750 07215
Philips Semiconductors
2000 Jun 19 8

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