mm74hc148 Fairchild Semiconductor, mm74hc148 Datasheet

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mm74hc148

Manufacturer Part Number
mm74hc148
Description
8-3 Line Priority Encoder
Manufacturer
Fairchild Semiconductor
Datasheet

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© 1999 Fairchild Semiconductor Corporation
MM74HC148M
MM74HC148MTC
MM74HC148N
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
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Order Number
Pin Assignments for DIP, SOIC and TSSOP
Package Number
MTC16
M16A
N16E
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
DS009390.prf
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 V
Features
Truth Table
H
L
X
Typical propagation delay: 13 ns
Wide supply voltage range: 2V–6V
LOW
Irrelevant
HIGH
EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO
H X X X X X X X X H
L H H H H H H H H H
L X X X X X X X L
L X X X X X X L H L
L X X X X X L H H L
L X X X X L H H H L
L X X X L H H H H H
L X X L H H H H H H
L X L H H H H H H H
L L H H H H H H H H
Package Description
Inputs
October 1987
Revised February 1999
L
CC
H
H
H
H
H
H
and ground.
L
L
L
L
Outputs
www.fairchildsemi.com
H
H
H
H
H
H
L
L
L
L
H
H
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
L

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mm74hc148 Summary of contents

Page 1

... 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– ...

Page 2

Schematic Diagram www.fairchildsemi.com 2 ...

Page 3

Logic Diagram 3 www.fairchildsemi.com ...

Page 4

Absolute Maximum Ratings (Note 2) Supply Voltage ( Input Voltage ( Output Voltage (V ) OUT Clamp Diode Current ( Output Current, per pin (I ) OUT DC ...

Page 5

AC Electrical Characteristics Symbol Parameter Maximum Propagation Delay, PHL PLH Any Input to Any Output AC Electrical Characteristics V = 2.0V to 6.0V pF (unless otherwise specified) CC ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow www.fairchildsemi.com Package Number M16A 6 ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 7 www.fairchildsemi.com ...

Page 8

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN ...

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