HD74HC251 查看數據表（PDF） - Renesas Electronics
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HD74HC251 Datasheet PDF : 9 Pages
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HD74HC251
1 of 8 Data Selectors/Multiplexers (with 3-state outputs)
REJ03D0599–0200
(Previous ADE-205-476)
Rev.2.00
Jan 31, 2006
Description
This multiplexer features both true (Y) and complement (W) outputs as well as a strobe input. The strobe must be at a
low logic level to enable this device. When the strobe input is high, both outputs are in the high impedance state.
When enabled, address information on the data select inputs determine which data input is routed to the Y and W
outputs.
Features
• High Speed Operation: tpd (A, B, C to Y) = 20 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
• Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74HC251P
DILP-16 pin
PRDP0016AE-B
(DP-16FV)
P
HD74HC251FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
(FP-16DAV)
FP
HD74HC251RPEL SOP-16 pin (JEDEC)
PRSP0016DG-A RP
(FP-16DNV)
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
—
EL (2,000 pcs/reel)
EL (2,500 pcs/reel)
Function Table
Inputs
Select
C
B
A
X
X
X
L
L
L
L
L
H
L
H
L
L
H
H
H
L
L
H
L
H
H
H
L
H
H
H
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
Outputs
Y
W
Z
Z
D0
D0
D1
D1
D2
D2
D3
D3
D4
D4
D5
D5
D6
D6
D7
D7
Rev.2.00 Jan 31, 2006 page 1 of 8
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