SN74CBT16214C

12BIT 1OF3 FET MULTIPLEXER/DEMULTIPLEXER

5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION

SCDS121B − JUNE 2003 − REVISED OCTOBER 2003

2

POST OFFICE BOX 655303

description/ordering information (continued)

The SN74CBT16214C is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state

B ports of the SN74CBT16214C 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 SN74CBT16214C is a 12-bit 1-of-3 multiplexer/demultiplexer. The select (S0, S1, S2) inputs control the

data path of each multiplexer/demultiplexer. When the multiplexer/demultiplexer is enabled, the A port is

connected to the B port, allowing bidirectional data flow between ports. When the multiplexer/demultiplexer is

disabled, a 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.

To ensure the high-impedance state during power up or power down, each select input should be tied to GND

through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability

of the driver.

FUNCTION TABLE

INPUTS

INPUT/OUTPUT

FUNCTION

S2

S1

S0

INPUT/OUTPUT

A

FUNCTION

L

L

L

Z

Disconnect

L

LH

B1

A port = B1 port

L

HL

B2

A port = B2 port

L

HH

Z

Disconnect

H

LL

Z

Disconnect

H

LH

B3

A port = B3 port

H

HL

B1

A port = B1 port

H

H

H

B2

A port = B2 port