SN74CBT16244C

16BIT FET BUS SWITCH

5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION

SCDS134A − SEPTEMBER 2003 − REVISED OCTOBER 2003

2

POST OFFICE BOX 655303

description/ordering information (continued)

allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the

SN74CBT16244C provides protection for undershoot up to −2 V by sensing an undershoot event and ensuring

that the switch remains in the proper OFF state.

The SN74CBT16244C is organized as four 4-bit bus switches with separate output-enable (1OE, 2OE, 3OE,

4OE) inputs. It can be used as four 4-bit bus switches, two 8-bit bus switches, or as one 16-bit bus switch. When

OE is low, the associated 4-bit bus switch is ON, and the A port is connected to the B port, allowing bidirectional

data flow between ports. When OE is high, the associated 4-bit bus switch is OFF, and the high-impedance state

exists between the A and B ports.

damaging current will not backflow through the device when it is powered down. The device has isolation during

power off.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

FUNCTION TABLE

(each 4-bit bus switch)

INPUT

INPUT/OUTPUT

FUNCTION

INPUT

OE

INPUT/OUTPUT

A

FUNCTION

L

B

A port = B port

H

Z

Disconnect

logic diagram (positive logic)

1A1

SW

1B1

1A4

1OE

SW

1B4

3A1

SW

3B1

3A4

3OE

SW

3B4

47

43

1

36

32

25

2

6

13

17

2A1

SW

2B1

2A4

2OE

SW

2B4

4A1

SW

4B1

4A4

4OE

SW

4B4

41

37

48

30

26

24

8

12

19

23