74AC520(2007) 查看數據表（PDF） - Fairchild Semiconductor
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74AC520 Datasheet PDF : 11 Pages
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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
March 2007
tm
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
IA = B
L
L
H
H
Inputs
A, B
A = B(1)
A≠B
A = B(1)
A≠B
H = HIGH Voltage Level
L = LOW Voltage Level
Note:
1. A0 = B0, A1 = B1, A2 = B2, etc.
Outputs
OA = B
L
H
H
H
FACT™ is a trademark of Fairchild Semiconductor Corporation.
©1989 Fairchild Semiconductor Corporation
74AC520, 74ACT520 Rev. 1.4
www.fairchildsemi.com
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