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PDF HD74HC238 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC238 | |
| Descripción | 3-to-8-line Decoder/Demultiplexer | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74HC238
3-to-8-line Decoder/Demultiplexer
Description
The HD74HC238 has 3 binary select inputs (A, B and C). If the device is enabled these inputs determine
which one of the eight normally high outputs will go low. Two active low and one active high enables (G1,
G2A and G2B) are provided to ease the cascading of decoders.
Features
• High Speed Operation: tpd (Data to Y) = 15 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
Enable
Select
Outputs
G1
G2A
G2B
C
B
A
Y0 Y1
Y2 Y3 Y4 Y5 Y6
Y7
XX H X X X L L L L L L L L
XHX X X X L L L L L L L L
LXX XXXL L L L L L L L
HL L L L L H L L L L L L L
HL L L L H L H L L L L L L
HL L L H L L L H L L L L L
HL L L H H L L L H L L L L
HL L H L L L L L L H L L L
HL L H L H L L L L L H L L
HL L H H L L L L L L L H L
HL L H H H L L L L L L L H
1 page  
HD74HC238
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
— — 150 —
— 15 30 —
— — 26 —
Max Unit
190 ns
38
33
2.0 — — 150 — 190 ns
4.5 — 13 30 — 38
6.0 — — 26 — 33
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
Select to Y
Enable to Y
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HD74HC238.PDF ] | |
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