SLS SL74LS244D, SL74LS244N Datasheet

Semiconductor

Octal 3-State Noninverting Buffer/Line
Driver/Line Receiver

These octal buffers and line drivers and designed specifically to
improve both the performance and density of three-state memory
address drivers, clock drivers, and busoriented receivers and
transmitters.

This devise features high fan-out, improved fan-in, and 400 mV noise
margin.

It can be used to drive terminated lines down to 133 ohms.

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

Registers

• P-N-P Inputs Reduce D-C Loading

• Hysteresis at Inputs Improves Noise Margins

ORDERING INFORMATION

SL74LS244N Plastic

SL74LS244D SOIC

SL74LS244

TA = 0° to 70° C
for all packages

LOGIC DIAGRAM

PIN 20=VCC

PIN 10 = GND

PIN ASSIGNMENT

FUNCTION TABLE

Inputs Outputs

Enable A,

Enable B

L L L
L H H

A,B YA,YB

SLS

H X Z

X=don’t care
Z = high impedance

System Logic

SL74LS244

Semiconductor

MAXIMUM RATINGS*

Symbol Parameter Value Unit

VCC Supply Voltage 7.0 V
VIN Input Voltage 7.0 V

V

Output Voltage 5.5 V

OUT

Tstg Storage Temperature Range -65 to +150 °C

*

Maximum Ratings are those values beyond which damage to the device may occur.

Functional operation should be restricted to the Recommended Operating Conditions.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Max Unit

VCC Supply Voltage 4.75 5.25 V
VIH High Level Input Voltage 2.0 V

VIL Low Level Input Voltage 0.8 V
IOH High Level Output Current -15 mA
IOL Low Level Output Current 24 mA

TA Ambient Temperature Range 0 +70 °C

DC ELECTRICAL CHARACTERISTICS over full operating conditions

Guaranteed Limit

Symbol Parameter Test Conditions Min Max Unit

VIK Input Clamp Voltage VCC = min, IIN = -18 mA -1.5 V

VOH High Level Output Voltage VCC = min, IOH = -1.0 mA 2.7 V

VCC = min, IOH = -3.0 mA 2.4
VCC = min, IOH = -15 mA 2.0

VOL Low Level Output Voltage VCC = min, IOL = 12 mA 0.4 V

VCC = min, IOL = 24 mA 0.5

VT+ - VT- Hysteresis VCC = min 0.2 V

I

Output Off Current HIGH VCC = max, V

OZH

I

Output Off Current LOW VCC = max, V

OZL

IIH High Level Input Current VCC = max, VIN = 2.7 V 20 µA

= 2.7 V 20 µA

OUT

= 0.4 V -20 µA

OUT

VCC = max, VIN = 7.0 V 0.1 mA

IIL Low Level Input Current VCC = max, VIN = 0.4 V -0.2 mA

IO Output Short Circuit Current VCC = max, VO =0 V

-40 -225 mA

(Note 1)

ICC Supply Outputs High VCC = max 27 mA

Current Outputs Low Outputs open 46
All outputs

54

disabled

System Logic

SLS