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SN74CBTLV3257PWR Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce SN74CBTLV3257PWR
Description  FET Multiplexer/Demultiplexer
Download  28 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

SN74CBTLV3257PWR Fiches technique(HTML) 7 Page - Texas Instruments

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1B1
1A
OE
1B2
SW
SW
2B1
2A
2B2
SW
SW
3B1
3A
3B2
SW
SW
4B1
4A
4B2
SW
SW
S
4
7
9
12
1
15
2
3
5
6
11
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SN74CBTLV3257
www.ti.com
SCDS040K – DECEMBER 1997 – REVISED APRIL 2015
8 Detailed Description
8.1 Overview
The SN74CBTLV3257 device is a 4-bit 1-of-2 high-speed FET multiplexer and demultiplexer. The low ON-
state resistance of the switch allows connections to be made with minimal propagation delay.
The select (S) input controls the data flow. The FET multiplexers and demultiplexers are disabled when the
output-enable (OE) input is high.
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.
8.2 Functional Block Diagram
8.3 Feature Description
The SN74CBTLV3257 features 5-
Ω switch connection between ports, allowing for low signal loss across the
switch. Rail-to-rail switching on data I/O allows for full voltage swing outputs. Ioff supports partial-power-down
mode operation, protecting the chip from voltages at output ports when it is not powered on. Latch-up
performance exceeds 100 mA per JESD 78, Class II.
8.4 Device Functional Modes
Table 1. Function Table
INPUTS
FUNCTION
OE
S
L
L
A port = B1 port
L
H
A port = B2 port
H
X
Disconnect
Copyright © 1997–2015, Texas Instruments Incorporated
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