5-2

FAST AND LS TTL DATA

SN54/74LS174

FUNCTIONAL DESCRIPTION

The LS174 consists of six edge-triggered D flip-flops with

individual D inputs and Q outputs. The Clock (CP) and Master

Reset (MR) are common to all flip-flops.

Each D input’s state is transferred to the corresponding flip-

flop’s output following the LOW to HIGH Clock (CP) transition.

A LOW input to the Master Reset (MR) will force all outputs

LOW independent of Clock or Data inputs. The LS174 is

useful for applications where the true output only is required

and the Clock and Master Reset are common to all storage

elements.

TRUTH TABLE

Inputs (t = n, MR = H)

Outputs (t = n+1) Note 1

D

Q

H

H

L

L

Note 1: t = n + 1 indicates conditions after next clock.

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

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

VIH

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

All Inputs

VIL

Input LOW Voltage

54

0.7

V

Guaranteed Input LOW Voltage for

All Inputs

VIL

Input LOW Voltage

74

0.8

V

Guaranteed Input LOW Voltage for

All Inputs

VIK

Input Clamp Diode Voltage

– 0.65

– 1.5

V

VCC = MIN, IIN = – 18 mA

VOH

Output HIGH Voltage

54

2.5

3.5

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOH

Output HIGH Voltage

74

2.7

3.5

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOL

Output LOW Voltage

54, 74

0.25

0.4

V

IOL = 4.0 mA

VCC = VCC MIN,

VIN = VIL or VIH

per Truth Table

VOL

Output LOW Voltage

74

0.35

0.5

V

IOL = 8.0 mA

VIN = VIL or VIH

per Truth Table

IIH

Input HIGH Current

20

µA

VCC = MAX, VIN = 2.7 V

IIH

Input HIGH Current

0.1

mA

VCC = MAX, VIN = 7.0 V

IIL

Input LOW Current

– 0.4

mA

VCC = MAX, VIN = 0.4 V

IOS

Short Circuit Current (Note 1)

– 20

– 100

mA

VCC = MAX

ICC

Power Supply Current

26

mA

VCC = MAX

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.