SCDS115C − JANUARY 2003 − REVISED OCTOBER 2003
SN74CBT16210C
20 BIT FET BUS SWITCH
5 V BUS SWITCH WITH 2 V UNDERSHOOT PROTECTION
description/ordering information (continued)
The SN74CBT16210C is a high-speed TTL-compatible FET bus 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
SN74CBT16210C 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 SN74CBT16210C is organized as two 10-bit bus switches with separate output-enable (1OE, 2OE) inputs.
It can be used as two 10-bit bus switches or as one 20-bit bus switch. When OE is low, the associated 10-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 10-bit bus switch is OFF, and the 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, OE 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.
FUNCTION TABLE
(each 10-bit bus switch)
INPUT
OE
L
H
INPUT/OUTPUT
A
B
Z
FUNCTION
A port = B port
Disconnect
logic diagram (positive logic)
2
1A1
SW
46
1B1
12
1A10
SW
36
1B10
48
1OE
13
2A1
SW
35
2B1
24
2A10
SW
25
2B10
47
2OE
2
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•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
