8-3 Line Priority Encoder
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MM54HC148 MM74HC148 8-3 Line Priority Encoder
February 1988
MM54HC148 MM74HC148 8-3 Line Priority...
Description
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MM54HC148 MM74HC148 8-3 Line Priority Encoder
February 1988
MM54HC148 MM74HC148 8-3 Line Priority Encoder
General Description
This priority encoder utilizes advanced silicon-gate CMOS technology It has the high noise immunity and low power consumption typical of CMOS circuits as well as the speeds and output drive similar to LB-TTL This priority encoder accepts 8 input request lines 0– 7 and outputs 3 lines A0–A2 The priority encoding ensures that only the highest order data line is encoded Cascading circuitry (enable input EI and enable output EO) has been provided to allow octal expansion without the need for external circuitry All data inputs and outputs are active at the low logic level All inputs are protected from damage due to static discharge by internal diode clamps to VCC and ground
Features
Y Y
Typical propagation delay 13 ns Wide supply voltage range 2V – 6V
Connection Diagram
Dual-In-Line Package
TL F 9390 – 1
Order Number MM54HC148 or MM74HC148
Truth Table
Inputs EI H L L L L L L L L L 0 X H X X X X X X X L 1 X H X X X X X X L H 2 X H X X X X X L H H 3 X H X X X X L H H H 4 X H X X X L H H H H 5 X H X X L H H H H H 6 X H X L H H H H H H 7 X H L H H H H H H H Outputs A2 A1 A0 GS EO H H L L L L H H H H H H L L H H L L H H H H L H L H L H L H H H L L L L L L L L H L H H H H H H H H
H e High L e Low X e irrelevant
C1995 National Semiconductor Corporation
TL F 9390
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings (Notes 1
2)
O...
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