SN74CBT3383C Datasheet, PDF (2/15 Pages) Texas Instruments – 10-BIT FET BUS-EXCHANGE SWITCH 5-VBUS SWITCH WITH-2-V UNDERSHOOT PROTECTION

SN74CBT3383C
10ĆBIT FET BUSĆEXCHANGE SWITCH
5ĆV BUS SWITCH WITH -2ĆV UNDERSHOOT PROTECTION
SCDS175 − SEPTEMBER 2004
description/ordering information (continued)
The SN74CBT3383C is a high-speed TTL-compatible FET bus-exchange switch with low ON-state resistance
(r_on), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the
SN74CBT3383C 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 SN74CBT3383C is organized as a 10-bit bus switch, or as a 5-bit bus-exchange switch with a single
output-enable (BE) input that provides data exchanging between four signal ports. The select (BX) input controls
the data path of the bus-exchange switch. When BE is low, the A port is connected to the B port, allowing
bidirectional data flow between ports. When BE is high, 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, BE should be tied to V_CC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
INPUTS
BE BX
L
L
L
H
H
X
FUNCTION TABLE
(each 5-bit bus-exchange)
INPUTS/OUTPUTS
1A1−5A1 1A2−5A2
FUNCTION
1B1−5B1
1B2−5B2
A1 port = B1 port,
A2 port = B2 port
1B2−5B2
1B1−5B1
A1 port = B2 port,
A2 port = B1 port
Z
Z
Disconnect
2
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