Datasheet

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SCDS121B − JUNE 2003 − REVISED OCTOBER 2003
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description/ordering information (continued)
The SN74CBT16214C is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state
resistance (r
on
), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and
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.
This device is fully specified for partial-power-down applications using I
off
. The I
off
feature ensures that
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