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PDF HD74HC251 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC251 | |
| Descripción | 1 of 8 Data Selectors/Multiplexers (with 3-state outputs) | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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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 (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)
1 page  
HD74HC251
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
— — 205 —
— 20 41 —
— — 35 —
Max Unit
255 ns
51
43
tPLH 2.0 — — 205 — 255 ns
tPHL 4.5 — 20 41 — 51
6.0 — — 35 — 43
tPLH 2.0 — — 195 — 245 ns
tPHL 4.5 — 17 39 — 49
6.0 — — 33 — 42
tPLH 2.0 — — 185 — 230 ns
tPHL 4.5 — 17 37 — 46
6.0 — — 31 — 39
Output enable
time
t ZH
t ZL
2.0 — — 150 — 190 ns
4.5 — 11 30 — 38
6.0 — — 26 — 33
tZH 2.0 — — 145 — 180 ns
tZL 4.5 — 11 29 — 36
6.0 — — 25 — 31
Output disable
time
t HZ
t LZ
2.0 — — 220 — 275 ns
4.5 — 12 44 — 55
6.0 — — 37 — 47
tHZ 2.0 — — 195 — 245 ns
tLZ 4.5 — 12 39 — 49
6.0 — — 33 — 42
Output rise/fall
time
t TLH
t THL
2.0 — — 75 — 90 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
Test Conditions
A, B or C to Y
A, B or C to W
Data to Y
Data to W
strobe to W RL = 1 kΩ
strobe to Y RL = 1 kΩ
strobe to W RL = 1 kΩ
strobe to Y RL = 1 kΩ
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HD74HC251.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HD74HC251 | 1 of 8 Data Selectors/Multiplexers (with 3-state outputs) | Hitachi Semiconductor |
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