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CBT6820

20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion

Philips Electronics 

Philips Semiconductors

20-bit bus switch with precharged outputs and

Schottky undershoot protection for live insertion

Product specification

CBT6820

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-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.

PIN CONFIGURATION

BIASV 1

1A1 2

1A2 3

1A3 4

1A4 5

1A5 6

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

48 1OE

47 2OE

46 1B1

45 1B2

44 1B3

43 1B4

42 1B5

41 GND

40 1B6

39 1B7

38 1B8

37 1B9

36 1B10

35 2B1

34 2B2

33 2B3

32 GND

31 2B4

30 2B5

29 2B6

28 2B7

27 2B8

26 2B9

25 2B10

QUICK REFERENCE DATA

SYMBOL

PARAMETER

tPLH/tPHL

CIN

CI/O

Propagation delay

An to Bn or Bn to An

Input capacitance

Input/output capacitance

CONDITIONS

Tamb = 25°C; GND = 0V

CL = 50 pF, VCC = 5 V

Outputs disabled; VO = 0 V or VCC

SA00520

TYPICAL

0.25

4.5

9.5

UNIT

ns

pF

pF

ORDERING INFORMATION

PACKAGES

48-Pin Plastic TSSOP Type II

TEMPERATURE RANGE OUTSIDE NORTH AMERICA

–40°C to +85°C

CBT6820 DGG

NORTH AMERICA

CBT6820 DGG

DWG NUMBER

SOT362–1

1999 Apr 05

2

853–2152 21177

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