ST M74HCT374 User Manual

M74HCT374

OCTAL D-TYPE FLIP FLOP

WITH 3 STATE OUTPUT NON INVERTING

■ HIGH SPEED:

f

= 50 MHz (TYP.) at VCC = 4.5V

MAX

■ LOW POWER DISSIPATION:

I

= 4µA(MAX.) at TA=25°C

CC

■ COMPAT I B LE WITH TT L OUTPUTS :

V

= 2V (MIN.) VIL = 0.8V (MAX)

IH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PLH

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

OH

■ PIN AND FUNCTION COMPATIBLE WITH

PHL

| = IOL = 6mA (MIN)

74 SERIES 374

DESCRIPTION

The M74HCT374 is an high speed CMOS OCTAL
D-TYPE FLIP FLOP WITH 3-STATE OUTPUTS
NON INVERTING fabricated with silicon gate

2

C

MOS technology.
This 8 bit D-TYPE FLIP FLOP is con trolled by a
clock input (CK) and an o utpu t enable input (OE
On the positive transition of the clock, the Q
outputs will be set to the logic state that were
setup at the D inputs.
While the OE

input is at low level, the eight outputs
will be in a norm al logic state (high or low logic
level) and while OE

is at high level the outputs will

be in a high impedance state.

ORDER CODES

PACKAGE TUBE T & R

DIP M74HCT374B1R

SOP M74HCT374M1R M74HCT374RM13TR

TSSOP M74HCT374TTR

The output control does not affect the internal
operation of flip-flops; that is, the old data can be
retained or the new data can be entered even

).

while the outputs are off.
The M74HCT374 is designed to directly interface

2

HSC

MOS systems with TTL and NMOS
components.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.

TSSOPDIP SOP

PIN CONNECTION AND IEC LOGIC SYMBOLS

1/11July 2001

M74HCT374

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

1OE

2, 5, 6, 9, 12,

15, 16, 19

3, 4, 7, 8, 13,

14, 17, 18

11 CK Clock Input (LOW to

10 GND Ground (0V)
20 V

TRUTH TABLE

INPUTS OUTPUT

Q0 to Q7 3 State Outputs

D0 to D7 Data Inputs

CC

3 State Output Enable
Input (Active LOW)

HIGH, edge triggered)

Positive Supply Voltage

OE

HXXZ

L X NO CHANGE
LLL
LHH

X: Don’t Care
Z: High Impedance

LOGIC DIAGRAM

CK D Q

This log i c diagram has not be used to e st i m ate propagation dela ys

2/11

M74HCT374

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V

V

I

I

OK

I

I

or I

CC

P

T

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

V

V

V
T
t

r

Supply Voltage

CC

DC Input Voltage -0.5 to VCC + 0.5

I

DC Output Voltage -0.5 to VCC + 0.5

O

DC Input Diode Current

IK

DC Output Diode Current
DC Output Current

O

DC VCC or Ground Current

GND

Power Dissipation

D

Storage Temperature

stg

Lead Temperature (10 sec)

L

°C; derate to 300mW by 10mW/°C from 65° C to 85°C

Supply Voltage

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature

op

, t

Input Rise and Fall Time (VCC = 4.5 to 5.5V)

f

-0.5 to +7 V

± 20 mA
± 20 mA
± 35 mA
± 70 mA

500(*) mW

-65 to +150 °C

300 °C

4.5 to 5.5 V

CC
CC

-55 to 125 °C
0 to 500 ns

V
V

V
V

3/11

M74HCT374

DC SPECIFICATION

Symbol Parameter

V

V

V

V

I

I

∆ I

High Level Input

IH

Voltage

Low Level Input

IL

Voltage

High Level Output

OH

Voltage
Low Level Output

OL

Voltage

I

Input Leakage

I

Current
High Impedance

OZ

Output Leakage
Current

Quiescent Supply

CC

Current
Additional Worst

CC

Case Supply
Current

Test Condition Value

T

= 25°C

V

CC

(V)

A

Min. Typ. Max. Min. Max. Min. Max.

4.5
to

2.0 2.0 2.0 V

5.5

4.5
to

0.8 0.8 0.8 V

5.5

4.5

4.5

5.5

5.5

5.5

IO=-20 µA

I

=-6.0 mA

O

IO=20 µA

I

=6.0 mA

O

= VCC or GND

V

I

= VIH or V

V

I

VO = VCC or GND

= VCC or GND

V

I

5.5 Per Input pin

= 0.5V or

V

I

V

= 2.4V

I

4.4 4.5 4.4 4.4

4.18 4.31 4.13 4.10

0.0 0.1 0.1 0.1

0.17 0.26 0.33 0.40
± 0.1 ± 1 ± 1 µA

IL

± 0.5 ± 5 ± 10 µA

2.0 2.9 3.0 mA

Other Inputs at

V

or GND

CC

I

= 0

O

-40 to 85°C -55 to 125°C

Unit

V

V

44080µA

AC ELECTRICAL CHARACTERISTICS (C

Test Condition Value

Symbol Parameter

t

TLH tTHL

t

PLH tPHL

t

PZL tPZH

t

PLZ tPHZ

f

MAX

t

W(L)

t

W(H)

Output Transition
Time

Propagation Delay
Time (CLOCK-Q,Q

Output Enable
Time

Output Disable
Time

Maximum Clock
Frequency

Minimum Pulse
Width (CLOCK)

t

Minimum Set-Up

s

Time
Minimum Hold

t

h

Time

)

C

(pF)

L

V

CC

(V)

4.5 50 7 12 15 18 ns

4.5 50 20 30 38 45

4.5 150 25 38 48 57

4.5 50

4.5 150 25 38 48 57

4.5 50

4.5 50 31 50 25 21 MHz

4.5 50 15 19 23 ns

4.5 50 15 19 23 ns

4.5 50 0 0 0 ns

= 50 pF, Input tr = tf = 6ns)

L

= 25°C

T

A

Min. Typ. Max. Min. Max. Min. Max.

= 1 KΩ

R

L

= 1 KΩ

R

L

17 30 38 45

16 28 35 42 ns

-40 to 85°C -55 to 125°C

Unit

ns

ns

4/11