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HD74LS251 Datasheet

1 of 8 Data Selector / Multiplexer

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HD74LS251
1 of 8 Data Selector / Multiplexer
(with strobe and three-state outputs)
REJ03D0467–0300
Rev.3.00
Jul.15.2005
This data selector / multiplexer contains full on-chip binary decoding to select one-of-eight data sources and features a
strobe-controlled 3-state output.
The strobe must be at a low logic level to enable this device. The 3-state outputs permit a number of outputs to be
connected to a common bus.
When the strobe input is high, both outputs are in a high-impedance state in which both the upper and lower transistors
of each totem-pole output are off, and the output neither drives nor loads the bus significantly. When the strobe is low,
the outputs are activated and operate as standard TTL totem-pole outputs.
To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output
control circuitry is designed so that the average output disable time is shorter than the average output enable time.
Features
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74LS251P
DILP-16 pin
PRDP0016AE-B
(DP-16FV)
P
HD74LS251FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
(FP-16DAV)
FP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
Pin Arrangement
31
22
Data Inputs
13
04
Y
Outputs
W
5
6
Strobe 7
GND 8
D3
D2 D4
D1 D5
D0 D6
Y D7
W
S
C
A
B
16 VCC
15 4
14 5
13 6
Data Inputs
12 7
11 A
10 B Data Select
9C
(Top view)
Rev.3.00, Jul.15.2005, page 1 of 5


Renesas Electronics Components Datasheet

HD74LS251 Datasheet

1 of 8 Data Selector / Multiplexer

No Preview Available !

HD74LS251
Function Table
Inputs
Select
CBA
XXX
LLL
L LH
LHL
L HH
HL L
HLH
HH L
HHH
Notes: 1. H; high level, L; low level, X; irrelevant
2. Z; high impedance (off-state)
3. D0 through D7; the level of the respective D input.
Strobe
S
H
L
L
L
L
L
L
L
L
Block Diagram
Strobe
(Enable)
Data
Inputs
D0
D1
D2
D3
D4
D5
D6
D7
Data
Select
(Binary)
A
B
C
A
A
B
B
C
C
Outputs
YW
ZZ
D0 D0
D1 D1
D2 D2
D3 D3
D4 D4
D5 D5
D6 D6
D7 D7
Output Y
Output W
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
VCC
7
Input voltage
VIN 7
Output voltage (off-state)
VO (off)
5.5
Operating temperature
Topr
–20 to +75
Power dissipation
PT 400
Storage temperature
Tstg –65 to +150
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Unit
V
V
V
°C
mW
°C
Rev.3.00, Jul.15.2005, page 2 of 5


Part Number HD74LS251
Description 1 of 8 Data Selector / Multiplexer
Maker Renesas
Total Page 6 Pages
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