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74VHC244N

Octal Buffer/Line Driver with 3-STATE Outputs

Fairchild Semiconductor 

November 1992

Revised April 1999

74VHC244

Octal Buffer/Line Driver with 3-STATE Outputs

General Description

The VHC244 is an advanced high speed CMOS octal bus

buffer fabricated with silicon gate CMOS technology. It

achieves high speed operation similar to equivalent Bipolar

Schottky TTL while maintaining the CMOS low power dissi-

pation. The VHC244 is a non-inverting 3-STATE buffer hav-

ing two active-LOW output enables. These devices are

designed to be used as 3-STATE memory address drivers,

clock drivers, and bus oriented transmitter/receivers.

An input protection circuit ensures that 0V to 7V can be

applied to the input pins without regard to the supply volt-

age. This device can be used to interface 5V to 3V systems

and two supply systems such as battery back up. This cir-

cuit prevents device destruction due to mismatched supply

and input voltages.

Features

s High Speed: tPD = 3.9ns (typ) at VCC = 5V

s High noise immunity: VNIH = VNIL = 28% VCC (min)

s Power down protection is provided on all inputs

s Low noise: VOLP = 0.6V (typ)

s Low power dissipation: ICC = 4 µA (max) @ TA = 25°C

s Pin and function compatible with 74HC244

Ordering Code:

Order Number Package Number

Package Description

74VHC244M

M20B

20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide

74VHC244SJ

M20D

20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74VHC244MTC

MTC20

20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74VHC244N

N20A

20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbol

Connection Diagram

IEEE/IEC

Pin Descriptions

Pin Names

OE1, OE2

I0–I7

O0–O7

Description

3-STATE Output Enable Inputs

Inputs

3-STATE Outputs

© 1999 Fairchild Semiconductor Corporation DS011522.prf

www.fairchildsemi.com

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