74AC521(2000) 查看數據表（PDF） - Fairchild Semiconductor
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74AC521 Datasheet PDF : 9 Pages
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November 1988
Revised October 2000
74AC521 • 74ACT521
8-Bit Identity Comparator
General Description
The AC/ACT521 is an expandable 8-bit comparator. It
compares two words of up to eight bits each and provides a
LOW output when the two words match bit for bit. The
expansion input IA = B also serves as an active LOW enable
input.
Features
s ICC reduced by 50%
s Compares two 8-bit words in 6.5 ns typ
s Expandable to any word length
s 20-pin package
s Outputs source/sink 24 mA
s ACT521 has TTL-compatible inputs
Ordering Code:
Order Number Package Number
Package Description
74AC521SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74AC521SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC521MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC521PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
74ACT521SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74ACT521SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT521MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT521PC
N20A
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 table.
Logic Symbols
Connection Diagram
IEEE/IEC
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
FACT is a trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation DS009964
www.fairchildsemi.com
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