Fairchild Semiconductor DM74ALS125N, DM74ALS125MX, DM74ALS125M Datasheet

© 2000 Fairchild Semiconductor Corporation DS010620 www.fairchildsemi.com

November 1989
Revised February 2000

DM74ALS125 Quad 3-STATE Buffer

DM74ALS125
Quad 3-STATE Buffer

General Description

This device contains four independent gates each of which
performs a non-invertin g buffer function . The outpu ts have
the 3-STATE feature. The 3-STATE circuitry contains a fea ­ture that maintains the buffer outputs in 3-STATE (high
impedance state) during pow er supply ramp-up or ramp­down. This eliminates bus glitching problems that arise
during power-up and p ower-down. To minimize the possi­bility that two outputs will attempt to take a co mmon bus to
opposite logic levels, t he disable time is short er than the
enable time of the outputs.

Features

■ Advanced low power oxide-isolated ion-implanted
Schottky TTL process

■ Functional and pin compatible with the 74LS counterpart

■ Switching response specified into 500Ω and 50 pF load

■ Switching response specific ations guaranteed over full

temperat ure and V

CC

supply range

■ PNP input design reduces input loading

■ Low level drive current: 74ALS = 24 mA

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

Connection Diagram

Functional Table

Y = A

H = HIGH Logic Level
L = LOW Logic Level
X = Either LOW or HIGH Logic Level
Hi-Z = 3-STATE (Outputs are disabled)

Logic Diagram

Order Number Package Number Package Description

DM74ALS125M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74ALS125N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Input Output

AC Y

LL L
HL H
X H Hi-Z

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DM74ALS125

Absolute Maximum Ratings(Note 1)

Note 1: The Absolute Maximum Ratings are those values beyond which

the safety of the dev ice cannot be guaranteed. T he device sh ould not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.

The “Recommend ed O peratin g Cond itions” t able w ill defin e the co ndition s
for actual device operation.

Recommended Operating Conditions

Electrical Characteristics

over recommended operating free air temperature (unless otherwise specified)

Supply Voltage, V

CC

7V
Input Voltage 7V
Voltage Applied to Disabled Output 5.5V
Operating Free Air Temperature Range 0 to +70°C
Storage Temperature Range −65°C to +150°C
Typical θ

JA

N Package 78.0°C/W
M Package 111.0°C/W

Symbol Parameter Min Typ Max Units

V

CC

Supply Voltage 4.5 5 5.5 V

V

IH

HIGH Level Input Voltage 2 V

V

IL

LOW Level Input Voltage 0.8 V

I

OH

HIGH Level Output Current −15 mA

I

OL

LOW Level Output Current 24 mA

T

A

Operating Free-Air Temperature 0 70 °C

Symbol Parameter Conditions Min Typ Max Units

V

IK

Input Clamp Voltage VCC = 4.5V, II = −18 mA −1.5 V

V

OH

HIGH Level VCC = 4.5V to 5.5V IOH = −0.4 mA VCC − 2V
Output Voltage VCC = 4.5V IOH = −3 mA 2.4 V

IOH = Max 2 V

V

OL

LOW Level VCC = 4.5V IOL = 12 mA 0.25 0.4 V
Output Voltage IOL = 24 mA 0.35 0.5 V

I

I

Input Current at Max

VCC = 5.5V, VI = 7V 0.1 mA

Input Voltage

I

IH

HIGH Level

VCC = 5.5V, VI = 2.7V 20 µA

Input Current

I

IL

LOW Level

VCC = 5.5V, VIL = 0.4V −0.1 mA

Input Current

I

O

Output Drive

VCC = 5.5V, VO = 2.25V −30 −112 mA

Current

I

OZH

HIGH Level 3-STATE

VCC = 5.5V, VO = 2.7V 20 µA

Output Current

I

OZL

LOW Level 3-STATE

VCC = 5.5V, VO = 0.4V −20 µA

Output Current

I

CC

Supply Current VCC = 5.5V Outputs HIGH 7 10 mA

Outputs LOW 10 14 mA
3-STATE 13.5 18 mA