National Semiconductor 5474, DM5474, DM7474 Technical data

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5474/DM5474/DM7474
Dual Positive-Edge-Triggered D Flip-Flops
with Preset, Clear and Complementary Outputs

General Description

This device contains two independent positive-edge-trig­gered D flip-flops with complementary outputs. The informa­tion on the D input is accepted by the flip-flops on the posi­tive going edge of the clock pulse. The triggering occurs at a
voltage level and is not directly related to the transition time
of the rising edge of the clock. The data on the D input may
be changed while the clock is low or high without affecting
the outputs as long as the data setup and hold times are not

Connection Diagram

violated. A low logic level on the preset or clear inputs will
set or reset the outputs regardless of the logic levels of the
other inputs.

Features

Y

Alternate Military/Aerospace device (5474) is available.
Contact a National Semiconductor Sales Office/Distrib­utor for specifications.

Dual-In-Line Package

June 1989

5474/DM5474/DM7474 Dual Positive-Edge-Triggered D Flip-Flops

with Preset, Clear and Complementary Outputs

Order Number 5474DMQB, 5474FMQB, DM5474J, DM5474W, DM7474M or DM7474N

See NS Package Number J14A, M14A, N14A or W14B

TL/F/6526– 1

Function Table

Inputs Outputs

PR CLR CLK D Q Q

LH XXHL
HL XXLH
LL XXH*H*
HH
HH
HH LXQ

e

H

High Logic Level

e

Either Low or High Logic Level

X

e

Low Logic Level

L

e

Positive-going transition of the clock.

u

e

This configuration is nonstable; that is, it will not persist when either the preset and/or clear

*

inputs return to their inactive (high) level.

e

The output logic level of Q before the indicated input conditions were established.

Q

0

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

TL/F/6526

u
u

HH L
LL H

0

Q

0

Absolute Maximum Ratings (Note)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 5.5V

Operating Free Air Temperature Range

DM54 and 54
DM74 0

Storage Temperature Range

b

55§Ctoa125§C

Ctoa70§C

§

b

65§Ctoa150§C

Note:

beyond which the safety of the device cannot be guaran­teed. The device should not be operated at these limits. The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.

Recommended Operating Conditions

Symbol Parameter

V

V

V

I

I

f

t

CC

IH

IL

OH

OL

CLK

W

Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

High Level Input Voltage 2 2 V

Low Level Input Voltage 0.8 0.8 V

High Level Output Current

Low Level Output Current 16 16 mA

Clock Frequency (Note 2) 0 15 0 15 MHz

Pulse Width Clock High 30 30
(Note 2)

Clock Low 37 37

Clear Low 30 30

Preset Low 30 30

t

SU

t

H

T

A

Note 1: The symbol (u) indicates the rising edge of the clock pulse is used for reference.

Note 2: T

Input Setup Time (Notes1&2) 20

Input Hold Time (Notes1&2) 5

Free Air Operating Temperature

e

A

25§C and V

e

5V.

CC

DM5474 DM7474

Min Nom Max Min Nom Max

u

u

b

55 125 0 70

The ‘‘Absolute Maximum Ratings’’ are those values

Units

b

0.4

b

0.4 mA

ns

20

u

5

u

ns

ns

C

§

Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

e

V

I

V

OH

V

OL

I

I

I

IH

Input Clamp Voltage V

High Level Output V
Voltage V

Low Level Output V
Voltage V

Input Current@Max V
Input Voltage

High Level Input V
Current V

CC

CC
IL

CC
IH

CC

CC
I

e

e

e

eb

Min, I

e

Min, I

Max, V

e

Min, I

Min, V

e

Max, V

e

Max D 40

2.4V

12 mA

I

e

Max

OH

e

Min

IH

e

Max

OL

e

Max

IL

e

5.5V

I

Clock 80

Clear 120

Preset 40

I

IL

Low Level Input V
Current V

e

CC

e

0.4V

I

(Note 6)

Max D

Clock

Clear

Preset

I

OS

I

CC

Note 3: All typicals are at V

Note 4: Not more than one output should be shorted at a time.

Note 5: With all outputs open, I

Note 6: Clear is tested with preset high and preset is tested with clear high.

Short Circuit V
Output Current (Note 4)

Supply Current V

e

e

5V, T

CC

CC

25§C.

A

is measured with the Q and Q outputs high in turn. At the time of measurement the clock is grounded.

e

Max DM54

CC

DM74

e

Max (Note 5) 17 30 mA

CC

2

2.4 3.4 V

b

20

b

18

Typ

(Note 3)

Max Units

b

1.5 V

0.2 0.4 V

1mA

b

1.6

b

3.2

b

3.2

b

1.6

b

55

b

55

mA

mA

mA