參數(shù)資料
型號(hào)： HD74HC149FP
元件分類： 算術(shù)邏輯單元
英文描述： HC/UH SERIES, 8-BIT ENCODER, PDSO20
封裝： FP-20DA
文件頁(yè)數(shù)： 1/9頁(yè)
文件大小： 58K
代理商： HD74HC149FP
HD74HC149
8-to-8-line Priority Encoder
Description
The HD74HC149 is priority encoder which has 8 input lines (0 - 7) and 8 output lies (Y
0 - 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 (Y
0 - Y7) is low, P output is low and this indicates active condition.
Features
High Speed Operation: t
pd (0 - 7 to Y) = 16 ns typ (CL = 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC = 2 to 6 V
Low Input Current: 1 A max
Low Quiescent Supply Current: I
CC (static) = 4 A max (Ta = 25°C)
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