74ACT520

74AC520, 74ACT520 8-Bit Identity Comparator

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74AC520, 74ACT520 8-Bit Identity Comparator

March 2007

74AC520, 74ACT520 8-Bit Identity Comparator
Features
Compares two 8-bit words in 6.5ns typ. Expandable to any word length 20-pin package Outputs source/sink 24mA ACT520 has TTL-compatible inputs

General Description
The AC/ACT520 are expandable 8-bit comparators. They compare two words of up to eight bits each and provide a LOW output when the two words match bit for bit. The expansion input IA B also serves as an active LOW enable input.

Ordering Information
Order Number
74AC520SC 74ACT520SC 74ACT520SJ 74ACT520PC

Package Number
M20B M20B M20D N20A

Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Body 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Body 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering number.

Connection Diagram

Pin Descriptions
Pin Names
A0 A7 B0 B7 TA B OA B

Description
Word A Inputs Word B Inputs Expansion or Enable Input Identity Output

Truth Table
Inputs IA B
L L H H H HIGH Voltage Level L LOW Voltage Level Note: 1. A0 B0, A1 B1, A2 B2, etc.

Outputs A, B
A A B(1) B(1) AB AB

OA B
L H H H

FACTTM is a trademark of Fairchild Semiconductor Corporation. 1989 Fairchild Semiconductor Corporation 74AC520, 74ACT520 Rev. 1.4 www.fairchildsemi.com