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PDF HD74HC149 Data sheet ( Hoja de datos )

Número de pieza HD74HC149
Descripción 8-to-8-line Priority Encoder
Fabricantes Hitachi Semiconductor　
Logotipo Hitachi Semiconductor Logotipo



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HD74HC149
8-to-8-line Priority Encoder
Description
The HD74HC149 is priority encoder which has 8 input lines (0 - 7) and 8 output lies (Y0 - Y7).
It is the logical combination of a HD74HC148 8-3 line priority encoder driving a HD74HC138 3-8 line
decoder.
Only one request output can be low at a time. The output that is low is dependent on the highest priority
request that is low. The order of priority is 7 highest and 0 lowest.
When E input is high, all outputs are high.
When a output (Y0 - Y7) is low, P output is low and this indicates active condition.
Features
• High Speed Operation: tpd (0 - 7 to Y) = 16 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)

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HD74HC149 pdf
HD74HC149
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
— — 140 —
— 16 28 —
— — 24 —
Max Unit
175 ns
35
30
tPLH 2.0 — — 155 — 195 ns
tPHL 4.5 — 13 31 — 39
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
0 - 7 to Y, P
E to Y, P
5

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