HD74LS174 datasheet(5/9 Pages) RENESAS

5 / 9 page

HD74LS174 / HD74LS175

Rev.3.00, Jul.15.2005, page 5 of 8

Switching Characteristics

• HD74LS174

(VCC = 5 V, Ta = 25°C)

Item

Symbol

Inputs

Outputs

min.

typ.

max.

Unit

Condition

Maximum clock frequency

ƒmax

Clock

—

MHz

tPHL

Clear

—

tPLH

Clock

—

Propagation delay time

tPHL

Clock

—

CL = 15 pF,

RL = 2 k

Ω

• HD74LS175

(VCC = 5 V, Ta = 25°C)

Item

Symbol

Inputs

Outputs

min.

typ.

max.

Unit

Condition

Maximum clock frequency

ƒmax

Clock

—

MHz

tPLH

—

tPHL

Clear

—

tPLH

Clock

—

Propagation delay time

tPHL

Clock

—

CL = 15 pF,

RL = 2 k

Ω

Testing Method

Test Circuit

Load circuit 1

Out

VCC

P.G.

Zout = 50

Ω

P.G.

Zout = 50

Ω

CLR

Same as Load Circuit 1.

Out

Notes:

Test is put into the each flip-flop.

CL includes probe and jig capacitance.

All diodes are 1S2074(H).

Testing Table

Inputs

Outputs

Item

From input to output

CLR

ƒmax

→Q, Q*

4.5 V

→Q, Q*

4.5 V

tPLH

tPHL

CLR

→Q, Q*

4.5 V

OUT

Note:

*. HD74LS175 only

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