SN74HCT257 Datasheet, PDF (1/8 Pages) Texas Instruments – QUADRUPLE 2 LINE TO 1 LINE DATA SELECTORS/ MULTIPLEXERS WITH 3 STATE OUTPUTS

SN54HCT257, SN74HCT257
QUADRUPLE 2ĆLINE TO 1ĆLINE DATA SELECTORS/MULTIPLEXERS
WITH 3ĆSTATE OUTPUTS
SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003
D Operating Voltage Range of 4.5 V to 5.5 V
D High-Current 3-State Outputs Interface
Directly With System Bus
D Typical t_pd = 17 ns
D Low Power Consumption, 80-µA Max I_CC
D ±6-mA Output Drive at 5 V
D Low Input Current of 1 µA Max
D Inputs Are TTL-Voltage Compatible
D Provide Bus Interface From Multiple
Sources in High-Performance Systems
D Buffered Inputs and Outputs
SN54HCT257 . . . J PACKAGE
SN74HCT257 . . . D OR N PACKAGE
(TOP VIEW)
SN54HCT257 . . . FK PACKAGE
(TOP VIEW)
A/B ₁
1A 2
1B 3
1Y 4
2A 5
2B 6
2Y 7
GND 8
16 ^V_CC
15 OE
14 4A
13 4B
12 4Y
11 3A
10 3B
9 3Y
1B
3 2 1 20 19
4
18
4A
1Y 5
17 4B
NC 6
16 NC
2A 7
15 4Y
2B 8
14 3A
9 10 11 12 13
description/ordering information
NC − No internal connection
The ’HCT257 devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in
bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at
the high logic level.
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.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N
Tube of 25
SN74HCT257N
SN74HCT257N
−40°C to 85°C
SOIC − D
Tube of 40
Reel of 2500
Reel of 250
SN74HCT257D
SN74HCT257DR
SN74HCT257DT
HCT257
CDIP − J
−55°C to 125°C
LCCC − FK
Tube of 25
Tube of 55
SNJ54HCT257J
SNJ54HCT257FK
SNJ54HCT257J
SNJ54HCT257FK
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are}
available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information current as of publication date. Products conform to
specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all
parameters.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  2003, Texas Instruments Incorporated
1