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PDF HD74HC157 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC157 | |
| Descripción | These devices each consist of four 2-input digital multiplexers with common select and strobe inputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74HC157/HD74HC158
Quad. 2-to-1-line Data Selectors/Multiplexers
(with noninverted outputs)
Quad. 2-to-1-line Data Selectors/Multiplexers
(with inverted outputs)
Description
These devices each consist of four 2-input digital multiplexers with common select and strobe inputs. On
the HD74HC157, when the strobe input is at logical “L” the four outputs assume the values as selected
from the inputs. When the strobe input is at a logical “H” the outputs assume logical “L”. The
HD74HC158 operates in the same manner, except that its outputs are inverted. Select decoding is done
internally resulting in a single select input only. If enabled, the select input determines whether the A or B
inputs get routed to their corresponding Y outputs.
Features
• High Speed Operation: tpd (Data to Output) = 12 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)
Function Table
Inputs
Output Y
Strobe
Select
A
B
HC157
HC158
HX X X L H
LL L X L H
LL H X H L
LH X L L H
LH X H H L
1 page  
HD74HC157/HD74HC158
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C
Ta = –40 to
+85°C
Item
Symbol
Propagation delay tPLH
time
t PHL
VCC (V)
2.0
4.5
6.0
Min Typ Max Min
— — 125 —
— 12 25 —
— — 21 —
Max Unit
155 ns
31
26
tPLH 2.0 — — 110 — 140 ns
tPHL 4.5 — 12 22 — 28
6.0 — — 19 — 24
tPHL 2.0 — — 125 — 155 ns
4.5 — 13 25 — 31
6.0 — — 21 — 26
tPLH 2.0 — — 160 — 200 ns
4.5 — 17 32 — 40
6.0 — — 27 — 34
tPHL 2.0 — — 160 — 200 ns
4.5 — 12 32 — 40
6.0 — — 27 — 34
tPLH 2.0 — — 160 — 200 ns
4.5 — 12 32 — 40
6.0 — — 27 — 34
Output rise/fall
time
t TLH
t THL
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
Test Conditions
Data to HD74HC157 only
output
HD74HC158 only
Select to output
Strobe to output
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet HD74HC157.PDF ] | |
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