NSC 5962-8855501FA, 5962-8855501EA Datasheet

TL/F/9526

54F/74F378 Parallel D Register with Enable

January 1995

54F/74F378
Parallel D Register with Enable

General Description

The ’F378 is a 6-bit register with a buffered common En­able. This device is similar to the ’F174, but with common
Enable rather than common Master Reset.

Features

Y

6-bit high-speed parallel register

Y

Positive edge-triggered D-type inputs

Y

Fully buffered common clock and enable inputs

Y

Input clamp diodes limit high-speed termination effects

Y

Full TTL and CMOS compatible

Commercial Military

Package

Package Description

Number

74F378PC N16E 16-Lead (0.300×Wide) Molded Dual-In-Line

54F378DM (QB) J16A 16-Lead Ceramic Dual-In-Line

74F378SC (Note 1) M16A 16-Lead (0.150×Wide) Molded Small Outline, JEDEC

74F378SJ (Note 1) M16D 16-Lead (0.300×Wide) Molded Small Outline, EIAJ

54F378FM (QB) W16A 16-Lead Cerpack

54F378LM (QB) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C

Note 1: Devices also available in 13×reel. Use suffixeSCX and SJX.

Logic Symbols Connection Diagrams

TL/F/9526– 1

IEEE/IEC

TL/F/9526– 4

Pin Assignment for

DIP, SOIC and Flatpak

TL/F/9526– 2

Pin Assignment

for LCC

TL/F/9526– 3

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C

1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.

Unit Loading/Fan Out

54F/74F

Pin Names Description

U.L. Input I

IH/IIL

HIGH/LOW Output IOH/I

OL

E Enable Input (Active LOW) 1.0/1.0 20 mA/b0.6 mA
D

0–D5

Data Inputs 1.0/1.0 20 mA/b0.6 mA

CP Clock Pulse Input (Active Rising Edge) 1.0/1.0 20 mA/

b

0.6 mA

Q0–Q

5

Outputs 50/33.3

b

1 mA/20 mA

Functional Description

The ’F378 consists of six edge-triggered D-type flip-flops
with individual D inputs and Q inputs. The Clock (CP) and
Enable (E

) inputs are common to all flip-flops.

When the E input is LOW, new data is entered into the
register on the LOW-to-HIGH transition of the CP input.
When the E

input is HIGH the register will retain the present

data independent of the CP input.

Truth Table

Inputs Output

E CP D

n

Q

n

H L X No Change
L L HH
LLLL

H

e

HIGH Voltage Level

L

e

LOW Voltage Level

X

e

Immaterial

L

e

LOW-to-HIGH Clock Transition

Logic Diagram

TL/F/9526– 5

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

2

Absolute Maximum Ratings (Note 1)

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

Storage Temperature

b

65§Ctoa150§C

Ambient Temperature under Bias

b

55§Ctoa125§C

Junction Temperature under Bias

b

55§Ctoa175§C

Plastic

b

55§Ctoa150§C

V

CC

Pin Potential to

Ground Pin

b

0.5V toa7.0V

Input Voltage (Note 2)

b

0.5V toa7.0V

Input Current (Note 2)

b

30 mA toa5.0 mA

Voltage Applied to Output

in HIGH State (with V

CC

e

0V)

Standard Output

b

0.5V to V

CC

TRI-STATEÉOutput

b

0.5V toa5.5V

Current Applied to Output

in LOW State (Max) twice the rated I

OL

(mA)

Note 1: Absolute maximum ratings are values beyond which the device may
be damaged or have its useful life impaired. Functional operation under
these conditions is not implied.

Note 2: Either voltage limit or current limit is sufficient to protect inputs.

Recommended Operating
Conditions

Free Air Ambient Temperature

Military

b

55§Ctoa125§C

Commercial 0

§

Ctoa70§C

Supply Voltage

Military

a

4.5V toa5.5V

Commercial

a

4.5V toa5.5V

DC Electrical Characteristics

Symbol Parameter

54F/74F

Units V

CC

Conditions

Min Typ Max

V

IH

Input HIGH Voltage 2.0 V Recognized as a HIGH Signal

V

IL

Input LOW Voltage 0.8 V Recognized as a LOW Signal

V

CD

Input Clamp Diode Voltage

b

1.2 V Min I

IN

eb

18 mA

V

OH

Output HIGH 54F 10% V

CC

2.5 I

OH

eb

1mA

Voltage 74F 10% V

CC

2.5 V Min I

OH

eb

1mA

74F 5% V

CC

2.7 I

OH

eb

1mA

V

OL

Output LOW 54F 10% V

CC

0.5
V Min

I

OL

e

20 mA

Voltage 74F 10% V

CC

0.5 I

OL

e

20 mA

I

IH

Input HIGH 54F 20.0

mA Max

V

IN

e

2.7V

Current 74F 5.0

I

BVI

Input HIGH Current 54F 100

mA Max

V

IN

e

7.0V

Breakdown Test 74F 7.0

I

CEX

Output HIGH 54F 250

mA Max

V

OUT

e

V

CC

Leakage Current 74F 50

V

ID

Input Leakage

74F 4.75 V 0.0

I

ID

e

1.9 mA

Test All Other Pins Grounded

I

OD

Output Leakage

74F 3.75 mA 0.0

V

IOD

e

150 mV

Circuit Current All Other Pins Grounded

I

IL

Input LOW Current

b

0.6 mA Max V

IN

e

0.5V

I

OS

Output Short-Circuit Current

b

60

b

150 mA Max V

OUT

e

0V

I

CCL

Power Supply Current 30 45 mA Max V

O

e

LOW

3