SN54HC251_15 Datasheet, PDF (1/22 Pages) Texas Instruments – DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

D 3-State Version of ’HC151
D Wide Operating Voltage Range of 2 V to 6 V
D High-Current 3-State Outputs Interface
Directly With System Bus or Can Drive Up
To 15 LSTTL Loads
D Low Power Consumption, 80-µA Max I_CC
D Typical t_pd = 9 ns
D ±6-mA Output Drive at 5 V
D Low Input Current of 1 µA Max
D Perform Parallel-to-Serial Conversion
D Complementary Outputs Provide True and
Inverted Data
description/ordering information
These data selectors/multiplexers contain full
binary decoding to select 1-of-8 data sources and
feature strobe-controlled complementary 3-state
outputs.
The 3-state outputs can interface with and drive
data lines of bus-organized systems. With all but
one of the common outputs disabled (in the
high-impedance state), the low impedance of the
single enabled output drives the bus line to a high
or low logic level. Both outputs are controlled by
the output-enable (OE) input. The outputs are
disabled when OE is high.
SN54HC251, SN74HC251
DATA SELECTORS/MULTIPLEXERS
WITH 3ĆSTATE OUTPUTS
SCLS132E − DECEMBER 1982 − REVISED SEPTEMBER 2003
SN54HC251 . . . J OR W PACKAGE
SN74HC251 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
D3 ¹
D2 ²
D1 ³
D0 ⁴
Y⁵
W⁶
OE ⁷
GND ⁸
16 _VCC
15 _D4
14 _D5
13 _D6
12 _D7
11 _A
10 _B
9_C
SN54HC251 . . . FK PACKAGE
(TOP VIEW)
3 2 1 20 19
D1 4
18 D5
D0 5
17 D6
NC 6
16 NC
Y7
15 D7
W8
14 _A
9 10 11 12 13
NC − No internal connection
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N
Tube of 25
SN74HC251N
SN74HC251N
Tube of 40
SN74HC251D
SOIC − D
Reel of 2500
Reel of 250
SN74HC251DR
SN74HC251DT
HC251
−40°C to 85°C
SOP − NS
SSOP − DB
Reel of 2000
Reel of 2000
SN74HC251NSR
SN74HC251DBR
HC251
HC251
Tube of 90
SN74HC251PW
TSSOP − PW
Reel of 2000
Reel of 250
SN74HC251PWR
SN74HC251PWT
HC251
CDIP − J
Tube of 25
SNJ54HC251J
SNJ54HC251J
−55°C to 125°C CFP − W
Tube of 150
SNJ54HC251W
SNJ54HC251W
LCCC − FK
Tube of 55
SNJ54HC251FK
SNJ54HC251FK
† _{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.
PRODUCTION DATA information is 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
On products compliant to MILĆPRFĆ38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
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