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SN74CB3T3257PW Datasheet(PDF) 2 Page - Texas Instruments

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Part # SN74CB3T3257PW
Description  4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN74CB3T3257PW Datasheet(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
VCC
≈VCC
5.5 V
0 V
NOTE A: If the input high voltage (VIH) level is greater than or equal to VCC – 1 V, and less than or equal to 5.5 V, then the output high voltage
(VOH) level will be equal to approximately the VCC voltage level.
Input Voltages
Output Voltages
0 V
≈VCC – 1 V
≈VCC – 1 V
VCC
IN
OUT
CB3T
SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
The SN74CB3T3257 is a 4-bit 1-of-2 multiplexer/demultiplexer with a single output-enable (OE) input. The select
(S) input controls the data path of the multiplexer/demultiplexer. When OE is low, the multiplexer/demultiplexer is
enabled, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is
high, the multiplexer/demultiplexer is disabled, and 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, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE
(EACH MULTIPLEXER/DEMULTIPLEXER)
INPUTS
INPUT/OUTPUT
FUNCTION
A
OE
S
L
L
B1
A port = B1 port
L
H
B2
A port = B2 port
H
X
Z
Disconnect
Figure 1. Typical DC Voltage Translation Characteristics
2


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