DM74ALS125N - National Semiconductor

TL/F/10620

DM74ALS125 Quad TRI-STATE Buffer

April 1991

DM74ALS125

Quad TRI-STATEÉBuffer

General Description

This device contains four independent gates each of which

performs a non-inverting buffer function. The outputs have

the TRI-STATE feature. The TRI-STATE circuitry contains a

feature that maintains the buffer outputs in TRI-STATE (high

impedance state) during power supply ramp-up or ramp-

down. This eliminates bus glitching problems that arise dur-

ing power-up and power-down. To minimize the possibility

that two outputs will attempt to take a common bus to oppo-

site logic levels, the disable time is shorter than the enable

time of the outputs.

Features

YAdvanced low power oxide-isolated ion-implanted

Schottky TTL process

YFunctional and pin compatible with the 74LS counter-

part

YSwitching response specified into 500Xand 50 pF load

YSwitching response specifications guaranteed over full

temperature and VCC supply range

YPNP input design reduces input loading

YLow level drive current:

74ALS e24 mA

Connection Diagram

Dual-In-Line Package

TL/F/10620–1

Order Number

DM74ALS125N or DM74ALS125M

See NS Package Number M14A or N14A

Functional Table

YeA

Input Output

AC Y

LL L

HL H

X H Hi-Z

HeHigh Logic Level

LeLow Logic Level

XeEither Low or High Logic Level

Hi-Z eTRI-STATE (Outputs are disabled)

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.

Absolute Maximum Ratings

Supply Voltage, VCC 7V

Input Voltage 7V

Voltage Applied to Disabled Output 5.5V

Operating Free Air Temperature Range

DM74ALS 0 to a70§C

Storage Temperature Range b65§Ctoa

150§C

Typical iJA

N Package 78.0§C/W

M Package 111.0§C/W

Note:

The ‘‘Absolute Maximum Ratings’’ are those values

beyond which the safety of the device cannot be guaran-

teed. 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 DM74ALS125 Units

Min Typ Max

VCC Supply Voltage 4.5 5 5.5 V

VIH High Level Input Voltage 2 V

VIL Low Level Input Voltage 0.8 V

IOH High Level Output Current b15 mA

IOL Low Level Output Current 24 mA

TAOperating Free-Air Temperature 0 70 §C

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

Symbol Parameter Conditions DM74ALS125 Units

Min Typ Max

VIK Input Clamp Voltage VCC e4.5V, IIeb

18 mA b1.5 V

VOH High Level Output VCC e4.5V to 5.5V IOH eb

0.4 mA VCC b2V

Voltage VCC e4.5V IOH eb

3 mA 2.4 V

IOH eMax 2 V

VOL Low Level Output VCC e4.5V IOL e12 mA 0.25 0.4 V

Voltage IOL e24 mA 0.35 0.5 V

IIInput Current at Max VCC e5.5V, VIe7V 0.1 mA

Input Voltage

IIH High Level Input VCC e5.5V, VIe2.7V 20 mA

Current

IIL Low Level Input VCC e5.5V, VIL e0.4V b0.1 mA

Current

IOOutput Drive VCC e5.5V, VOe2.25V b30 b112 mA

Current

IOZH High Level TRI-STATE VCC e5.5V, VOe2.7V 20 mA

Output Current

IOZL Low Level TRI-STATE VCC e5.5V, VOe0.4V b20 mA

Output Current

ICC Supply Current VCC e5.5V Outputs High 7 10 mA

Outputs Low 10 14 mA

TRI-STATE 13.5 18 mA

Switching Characteristics over recommended operating free-air temperature range (Note 1)

Symbol Parameter From To Conditions DM74ALS125 Units

(Input) (Output) Min Max

tPLH Propagation Delay Time A Y VCC e4.5V to 5.5V, 310ns

Low to High Level Output CLe50 pF,

tPHL Propagation Delay Time A Y R1 e500X,

210ns

High to Low Level Output R2 e500X,

tPZH Output Enable Time C Y

TAeMin to Max

213ns

to High Level Output

tPZL Output Enable Time C Y 212ns

to Low Level Output

tPHZ Output Disable Time C Y 18ns

from High Level Output

tPLZ Output Disable Time C Y 213ns

from Low Level Output

Note 1: See Section 5 for test waveforms and output load.

Logic Diagram

TL/F/10620–2

Physical Dimensions inches (millimeters)

Small Outline Package (M)

Order Number 74ALS125M

NS Package Number M14A

DM74ALS125 Quad TRI-STATE Buffer

Physical Dimensions inches (millimeters) (Continued) Lit. Ý102540

Molded Dual-In-Line Package (N)

Order Number 74ALS125N

NS Package Number N14A

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