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HD74HC149

Part Number	HD74HC149
Manufacturer	Hitachi Semiconductor
Description	8-to-8-line Priority Encoder
Published	Mar 23, 2005
Detailed Description	HD74HC149 8-to-8-line Priority Encoder Description The HD74HC149 is priority encoder which has 8 input lines (0 - 7) an...
Datasheet	HD74HC149 PDF File

Overview

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 - Y 7) 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 Ope...

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