SN74LS348DG ON Semiconductor, SN74LS348DG Datasheet

SN74LS348DG

Manufacturer Part Number

SN74LS348DG

Description

Manufacturer

ON Semiconductor

Datasheet

1.SN74LS348DG.pdf (4 pages)

Specifications of SN74LS348DG

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8-INPUT PRIORITY ENCODERS

WITH 3-STATE OUTPUTS

ers which provide the 8-line to 3-line function.

which has the highest priority (input 7 has the highest) is represented on the

outputs (output A0 is the lowest bit). An example would be if inputs 1, 2 and 4

were low, then a binary 4 would be represented on the outputs.

serves to indicate when any of the inputs are active.

sion without the need for special external circuitry.

state and outputs GS and EO to the high state. A high on all data inputs (0 – 7)

together with a low on the EI input disables outputs A0, A1, and A2 and forces

output GS to the high state and output EO to the low state.

bility of having priority encoding of n input signals.

ative going glitch on the GS (Group Signal) output and on a reduced tendency

for the A0, A1 and A2 outputs to become momentarily enabled. Both of these

occurrences happen when the EI input goes from a logical one to a logical zero

and all data inputs (0 – 7) are held at logical ones. The internal glitch reduction

circuitry does add an additional fan-in of one on all data inputs (compared to

that of the LS348).

The SN54 / 74LS348 and the SN54 / 74LS848 are eight input priority encod-

The outputs (A0 – A2) and inputs (0 – 7) are active low. The active low input

The GS (Group Signal) output is active low when any of the inputs are low. It

A0, A1 and A2 are three-state outputs. This allows for up to 64 line expan-

A logical one on the Enable Input (EI) forces A0, A1 ared A2 to the disabled

Use of the EI input in conjunction with the EO output provides for the capa-

The LS848 has special internal circuitry providing for a greatly reduced neg-

V CC

OUTPUTS

INPUTS

H H H H H H H H

X X X X X X X X

X X X X X X X L

X X X X X X L H

X X X X X L H H

X X X X L H H H

X X X L H H H H

X X L H H H H H

X L H H H H H H

0 1 2 3 4 5 6 7

L H H H H H H H

INPUTS

FUNCTION TABLE

OUTPUTS

FAST AND LS TTL DATA

OUTPUT

GND

5-1

OUTPUTS

H = HIGH Logic Level

L = LOW Logic Level

X = Irrelevant

Z = High Impedance State

8-INPUT PRIORITY ENCODERS

SN54/74LS348

SN54/74LS848

WITH 3-STATE OUTPUTS

ORDERING INFORMATION

LOW POWER SCHOTTKY

SN54LSXXXJ

SN74LSXXXN

SN74LSXXXD

Ceramic

Plastic

SOIC

CASE 751B-03

CASE 620-09

CASE 648-08

CERAMIC

N SUFFIX

D SUFFIX

J SUFFIX

PLASTIC

SOIC

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SN74LS348DG Summary of contents

Page 1

PRIORITY ENCODERS WITH 3-STATE OUTPUTS The SN54 / 74LS348 and the SN54 / 74LS848 are eight input priority encod- ers which provide the 8-line to 3-line function. The outputs (A0 – A2) and inputs (0 – 7) are active ...

Page 2

SN54/74LS348 SN54/74LS848 (5) EI (10) 0 (11) 1 (12) 2 (13) 3 (1) 4 (2) 5 (3) 6 (4) 7 SN54 / 74LS348 GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH ...

Page 3

SN54/74LS348 SN54/74LS848 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE S Symbol Parameter V IH Input HIGH Voltage Input LOW Voltage Input LOW Voltage V IK Input Clamp Diode Voltage Output HIGH Voltage A0, A1, ...

Page 4

SN54/74LS348 SN54/74LS848 AC CHARACTERISTICS ( 5 From From To To (Input) (Output) Symbol PLH 1 thru 7 1 thru A0 ...

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