HIT HD74ACT125, HD74AC125 Datasheet

HD74AC125/HD74ACT125

Quad Buffer/Line Driver with 3-State Output

Description

The HD74AC125/HD74ACT125 is an quad buffer and line driver designed to be employed as a memory
address driver, clock driver and bus oriented transmitter/receiver which provides improved PC board
density.

Features

• 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers

• Outputs Source/Sink 24 mA

• HD74ACT125 has TTL-Compatible Inputs

Pin Arrangement

GND

1

E



2

D

3

O

4

E

5

D

6

O

7

(Top view)

14

13

12

11

10

V

CC

E

D

O

E

D

9

O

8

HD74AC125/HD74ACT125

Logic Symbol

DO

E

Pin Names

D Data Inputs
E 3-State Output Enable Inputs (Active Low)
O Outputs

Truth Table

Inputs
E D Output

LL L
LH H
HX Z

H : High Voltage Level
L : Low Voltage Level
X : Immaterial
Z : High Impedance

DC Characteristics (unless otherwise specified)

Item Symbol Max Unit Condition

Maximum quiescent supply current I

Maximum quiescent supply current I

Maximum ICC/input (HD74ACT125) I

2

CC

CC

CCT

80 µAV

8.0 µAV

1.5 mA VIN = VCC – 2.1 V, VCC = 5.5 V

= VCC or ground, VCC = 5.5 V,

IN

Ta = Worst case

= VCC or ground, VCC = 5.5 V,

IN

Ta = 25°C

Ta = Worst case

AC Characteristics: HD74AC125

HD74AC125/HD74ACT125

Item Symbol V

Propagation delay t

PLH

(V)*1Min Typ Max Min Max Unit

CC

3.3 1.0 6.5 9.0 1.0 10.0 ns

5.0 1.0 5.5 7.0 1.0 7.5

Propagation delay t

PHL

3.3 1.0 6.5 9.0 1.0 10.0

5.0 1.0 5.0 7.0 1.0 7.5

Enable time t

PZH

3.3 1.0 6.0 10.5 1.0 11.0

5.0 1.0 5.0 7.0 1.0 8.0

Enable time t

PHZ

3.3 1.0 7.5 10.0 1.0 11.0

5.0 1.0 5.5 8.0 1.0 8.5

Disable time t

PZL

3.3 1.0 7.0 10.0 1.0 10.5

5.0 1.0 6.5 9.5 1.0 9.5

Disable time t

PLZ

3.3 1.0 7.5 10.5 1.0 11.5

5.0 1.0 6.5 9.0 1.0 9.5

Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V

Voltage Range 5.0 is 5.0 V ± 0.5 V

AC Characteristics: HD74ACT125

Ta = +25°C
C

= 50 pF

L

Ta = –40°C to +85°C
CL = 50 pF

Item Symbol V

Propagation delay t
Propagation delay t
Enable time t
Enable time t
Disable time t
Disable time t

PLH

PHL

PZH

PZL

PHZ

PLZ

Ta = +25°C
C

= 50 pF

L

(V)*1Min Typ Max Min Max Unit

CC

5.0 1.0 6.5 9.0 1.0 10.0 ns

5.0 1.0 7.0 9.0 1.0 10.0

5.0 1.0 6.0 8.5 1.0 9.5

5.0 1.0 7.0 9.5 1.0 10.5

5.0 1.0 7.0 9.5 1.0 10.5

5.0 1.0 7.5 10.0 1.0 10.5

Ta = –40°C to +85°C
CL = 50 pF

Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V

Capacitance

Item Symbol Typ Unit Condition

Input capacitance C
Power dissipation capacitance C

IN

PD

4.5 pF VCC = 5.5 V

45.0 pF VCC = 5.0 V

3