74148 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
74148 Datasheet PDF : 7 Pages
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October 1987
Revised September 2001
MM74HC148
8-3 Line Priority Encoder
General Description
The MM74HC148 priority encoder utilizes advanced sili-
con-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 cir-
cuitry (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 dis-
charge by internal diode clamps to VCC and ground.
Features
s Typical propagation delay: 13 ns
s Wide supply voltage range: 2V–6V
Ordering Code:
Order Number
MM74HC148M
MM74HC148N
Package Number
Package Description
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Connection Diagram
Truth Table
Inputs
Outputs
EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO
H XXXXXXXX H H H H H
L HHHHHHHH H H H H L
L XXXXXXXL L L L L H
L XXXXXXLH L L H L H
L XXXXX LHH L H L L H
L XXXX LHHH L H H L H
L XXX LHHHH H L L L H
L XX LHHHHH H L H L H
L X LHHHHHH H H L L H
L LHHHHHHH H H H L H
H = HIGH
L = LOW
X = Irrelevant
© 2001 Fairchild Semiconductor Corporation DS009390
www.fairchildsemi.com
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