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74CBT16212CDGVRE4 Datasheet(PDF) 2 Page - Texas Instruments

Part # 74CBT16212CDGVRE4
Description  24-BIT FET BUS-EXCHANGE SWITCH 5-V BUS SWITCH WITH -2-V UNDERSHOOT PROTECTION
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

74CBT16212CDGVRE4 Datasheet(HTML) 2 Page - Texas Instruments

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SN74CBT16212C
24BIT FET BUSEXCHANGE SWITCH
5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION
SCDS146A − OCTOBER 2003 − REVISED JANUARY 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The SN74CBT16212C is a high-speed TTL-compatible FET bus-exchange switch with low ON-state resistance
(ron), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the
SN74CBT16212C 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 SN74CBT16212C operates as a 24-bit bus switch, or as a 12-bit bus-exchange that provides data
exchanging between four signal ports. The select (S0, S1, S2) inputs control the data path of the bus-exchange
switch. When the bus-exchange switch is ON, the A port is connected to the B port, allowing bidirectional data
flow between ports. When the bus-exchange switch is disabled, a high-impedance state exists between the A
and B ports.
This device is fully specified for partial-power-down applications using Ioff. The Ioff 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
(each 12-bit bus-exchange)
INPUTS
INPUTS/OUTPUTS
FUNCTION
S2
S1
S0
A1
A2
FUNCTION
L
L
L
Z
Z
Disconnect
L
LH
B1
Z
A1 port = B1 port
L
HL
B2
Z
A1 port = B2 port
L
HH
Z
B1
A2 port = B1 port
H
LL
Z
B2
A2 port = B2 port
H
LH
Z
Z
Disconnect
H
H
L
B1
B2
A1 port = B1 port
A2 port = B2 port
H
H
H
B2
B1
A1 port = B2 port
A2 port = B1 port


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