SN74LS251 查看數據表（PDF） - Motorola => Freescale
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SN74LS251 Datasheet PDF : 6 Pages
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8-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
The TTL/MSI SN74LS251 is a high speed 8-Input Digital Multiplexer. It
provides, in one package, the ability to select one bit of data from up to eight
sources. The LS251 can be used as a universal function generator to
generate any logic function of four variables. Both assertion and negation
outputs are provided.
• Schottky Process for High Speed
• Multifunction Capability
• On-Chip Select Logic Decoding
• Inverting and Non-Inverting 3-State Outputs
• Input Clamp Diodes Limit High Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC I4 I5 I6 I7 S0 S1 S2
16 15 14 13 12 11 10 9
SN54/74LS251
8-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
12
3
4
56
78
I3
I2
I1
I0
Z
Z
E0 GND
PIN NAMES
S0–S2
E0
I0–I7
Z
Select Inputs
Output Enable (Active LOW) Inputs
Multiplexer Inputs
Multiplexer Output
Z
Complementary Multiplexer Output
NOTES:
a. 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
LOADING (Note a)
HIGH
LOW
0.5 U.L.
0.5 U.L.
0.5 U.L.
65 U.L.
65 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
15 U.L.
15 U.L.
16
1
16
1
N SUFFIX
PLASTIC
CASE 648-08
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
LOGIC DIAGRAM
9
S2
10
S1
11
S0
7
E1
I0
I1
I2
I3
I4
I5
I6
I7
4
3
2
1
15
14
13
12
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
5
6
Z
Z
FAST AND LS TTL DATA
5-410
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