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| INTEGRATED CIRCUITS CBT6820 20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion Product specification 1999 Apr 05 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 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 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. 1A6 7 GND 8 1A7 9 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 OUTSIDE NORTH AMERICA CBT6820 DGG NORTH AMERICA CBT6820 DGG DWG NUMBER SOT362-1 1999 Apr 05 2 853-2152 21177 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 Bias voltage 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 1999 Apr 05 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 1999 Apr 05 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 10MHz, 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 1999 Apr 05 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 1999 Apr 05 6 Philips Semiconductors Product specification 20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion CBT6820 NOTES 1999 Apr 05 7 Philips Semiconductors Product specification 20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion CBT6820 DEFINITIONS Data Sheet Identification Objective Specification Product Status Formative or in Design Definition This data sheet contains the design target or goal specifications for product development. Specifications 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. Preliminary Specification Preproduction Product Product Specification Full Production Philips Semiconductors and Philips Electronics North America Corporation reserve 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. Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. LIFE SUPPORT APPLICATIONS Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices, or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 Philips Semiconductors and Philips Electronics North America Corporation register eligible circuits under the Semiconductor Chip Protection Act. (c) Copyright Philips Electronics North America Corporation 1998 All rights reserved. Printed in U.S.A. |
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