5-24

FAST AND LS TTL DATA

SCHMITT TRIGGERS

DUAL GATE/HEX INVERTER

The SN54LS/ 74LS13 and SN54LS / 74LS14 contain logic gates / inverters

which accept standard TTL input signals and provide standard TTL output

levels. They are capable of transforming slowly changing input signals into

sharply defined, jitter-free output signals. Additionally, they have greater noise

margin than conventional inverters.

Each circuit contains a Schmitt trigger followed by a Darlington level shifter

and a phase splitter driving a TTL totem pole output. The Schmitt trigger uses

positive feedback to effectively speed-up slow input transitions, and provide

different input threshold voltages for positive and negative-going transitions.

This hysteresis between the positive-going and negative-going input

thresholds (typically 800 mV) is determined internally by resistor ratios and is

essentially insensitive to temperature and supply voltage variations.

14

13

12

11

10

9

1

2

3

4

5

6

VCC

8

7

GND

LOGIC AND CONNECTION DIAGRAMS

SN54 / 74LS13

SN54 / 74LS14

14

13

12

11

10

9

1

2

3

4

5

6

VCC

8

7

GND

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

– 55

0

25

25

125

70

°C

IOH

Output Current — High

54, 74

– 0.4

mA

IOL

Output Current — Low

54

74

4.0

8.0

mA

SN54/74LS13

SN54/74LS14

SCHMITT TRIGGERS

DUAL GATE / HEX INVERTER

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

CASE 632-08

N SUFFIX

PLASTIC

CASE 646-06

14

1

14

1

ORDERING INFORMATION

SN54LSXXJ

Ceramic

SN74LSXXN

Plastic

SN74LSXXD

SOIC

14

1

D SUFFIX

SOIC

CASE 751A-02