HITACHI HD74HC251

HD74HC251
1 of 8 Data Selectors/Multiplexers (with 3-state outputs)
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 determines which data
input is routed to the Y and W outputs.
Features
•
•
•
•
•
High Speed Operation: tpd (A, B, C to Y) = 20 ns typ (C L = 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)
HD74HC251
Function Table
Inputs
Select
Strobe
Outputs
C
B
A
S
Y
W
X
X
X
H
Z
Z
L
L
L
L
D0
D0
L
L
H
L
D1
D1
L
H
L
L
D2
D2
L
H
H
L
D3
D3
H
L
L
L
D4
D4
H
L
H
L
D5
D5
H
H
L
L
D6
D6
H
H
H
L
D7
D7
Notes 1. H: high level, L: low level, X: irrelevant
2. Z; high impedcance (off-state)
3. D0 through D7; the level of the respective D input.
Pin Arrangement
16 VCC
3
1
2
2
D2
1
3
0
D3
D4
15 4
D1
D5
14 5
4
D0
D6
13 6
Y
5
Y
D7
12 7
W
6
W
A
11 A
Strobe
7
S
B
10 B
GND
8
Data inputs
Data inputs
Outputs
C
9
(Top view)
2
C
Data select
HD74HC251
Block Diagram
A
B
C
D0
D1
D2
Strobe
D3
VCC
D4
Y
D5
VCC
D6
W
D7
3
HD74HC251
DC Characteristics
Ta = –40 to
+85°C
Ta = 25°C
Item
Symbol
VCC (V) Min Typ Max Min
Max
Unit
Input voltage
VIH
2.0
1.5 —
—
1.5
—
V
4.5
3.15 —
—
3.15
—
6.0
4.2 —
—
4.2
—
2.0
—
—
0.5
—
0.5
4.5
—
—
1.35 —
1.35
6.0
—
—
1.8
—
1.8
2.0
1.9 2.0 —
1.9
—
4.5
4.4 4.5 —
4.4
—
6.0
5.9 6.0 —
5.9
—
4.5
4.18 —
—
4.13
—
I OH = –4 mA
6.0
5.68 —
—
5.63
—
I OH = –5.2 mA
2.0
—
0.0 0.1
—
0.1
4.5
—
0.0 0.1
—
0.1
6.0
—
0.0 0.1
—
0.1
4.5
—
—
0.26 —
0.33
I OL = 4 mA
6.0
—
—
0.26 —
0.33
I OL = 5.2 mA
VIL
Output voltage
VOH
VOL
Test Conditions
V
V
V
Vin = VIH or VIL I OH = –20 µA
Vin = VIH or VIL I OL = 20 µA
Off-state output
current
I OZ
6.0
—
—
±0.5 —
±5.0
µA
Vin = VIH or VIL,
Vout = VCC or GND
Input current
Iin
6.0
—
—
±0.1 —
±1.0
µA
Vin = VCC or GND
Quiescent supply
current
I CC
6.0
—
—
4.0
40
µA
Vin = VCC or GND, Iout = 0 µA
4
—
HD74HC251
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
+85°C
Ta = 25°C
VCC (V) Min Typ Max Min
Max
Unit
Test Conditions
Propagation delay t PLH
2.0
—
—
205 —
255
ns
A, B or C to Y
time
4.5
—
20
41
—
51
6.0
—
—
35
—
43
t PLH
2.0
—
—
205 —
255
ns
A, B or C to W
t PHL
4.5
—
20
41
—
51
6.0
—
—
35
—
43
t PLH
2.0
—
—
195 —
245
ns
Data to Y
t PHL
4.5
—
17
39
—
49
6.0
—
—
33
—
42
t PLH
2.0
—
—
185 —
230
ns
Data to W
t PHL
4.5
—
17
37
—
46
6.0
—
—
31
—
39
ns
strobe to W
RL = 1 kΩ
ns
strobe to Y
RL = 1 kΩ
ns
strobe to W
RL = 1 kΩ
ns
strobe to Y
RL = 1 kΩ
Item
Symbol
t PHL
Output enable
t ZH
2.0
—
—
150 —
190
time
t ZL
4.5
—
11
30
—
38
6.0
—
—
26
—
33
t ZH
2.0
—
—
145 —
180
t ZL
4.5
—
11
29
—
36
6.0
—
—
25
—
31
Output disable
t HZ
2.0
—
—
220 —
275
time
t LZ
4.5
—
12
44
—
55
6.0
—
—
37
—
47
t HZ
2.0
—
—
195 —
245
t LZ
4.5
—
12
39
—
49
6.0
—
—
33
—
42
Output rise/fall
t TLH
2.0
—
—
75
—
90
time
t THL
4.5
—
5
15
—
19
6.0
—
—
13
—
16
—
—
5
10
—
10
Input capacitance
Cin
ns
pF
5
Unit: mm
19.20
20.00 Max
1
7.40 Max
9
6.30
16
8
1.3
0.48 ± 0.10
2.54 Min 5.06 Max
2.54 ± 0.25
0.51 Min
1.11 Max
7.62
+ 0.13
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-16
Conforms
Conforms
1.07 g
Unit: mm
10.06
10.5 Max
9
1
8
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
16
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DA
—
Conforms
0.24 g
Unit: mm
9.9
10.3 Max
9
1
8
0.635 Max
*0.42 ± 0.08
0.40 ± 0.06
0.15
*0.22 ± 0.03
0.20 ± 0.03
1.27
0.11
0.14 +– 0.04
1.75 Max
3.95
16
0.10
6.10 +– 0.30
1.08
0° – 8°
0.67
0.60 +– 0.20
0.25 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DN
Conforms
Conforms
0.15 g
Cautions
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received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
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