CBT6832 Datasheet | NXP Semiconductors

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 patible inputs and outputs - 5Ω 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-patible 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-kΩ 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 t PLH/t PHL 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...