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CBT6820DGG Datasheet(PDF) 2 Page - NXP Semiconductors |
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CBT6820DGG Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 8 page Philips Semiconductors Product specification CBT6820 20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion 2 1999 Apr 05 853–2152 21177 FEATURES • TTL compatible 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 • 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 Ω 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. PIN CONFIGURATION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 21 22 23 24 41 42 43 44 45 46 47 48 SA00520 1A1 1A2 1A3 1A4 1A5 1A6 GND 1A7 1A8 1A9 1A10 2A1 2A2 VCC 2A3 GND 2A4 2A5 2A6 2A7 2A8 2A9 2A10 1OE 2OE 1B1 1B2 1B3 1B4 1B5 GND 1B6 1B7 1B8 1B9 1B10 2B1 2B2 2B3 GND 2B4 2B5 2B6 2B7 2B8 2B9 2B10 BIASV QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS Tamb = 25°C; GND = 0V TYPICAL UNIT tPLH/tPHL Propagation delay An to Bn or Bn to An CL = 50 pF, VCC = 5 V 0.25 ns CIN Input capacitance 4.5 pF CI/O Input/output capacitance Outputs disabled; VO = 0 V or VCC 9.5 pF ORDERING INFORMATION PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER 48-Pin Plastic TSSOP Type II –40 °C to +85°C CBT6820 DGG CBT6820 DGG SOT362–1 |
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