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74F521

Fairchild
Part Number 74F521
Manufacturer Fairchild
Description 8-Bit Identity Comparator
Published May 28, 2005
Detailed Description 74F521 8-Bit Identity Comparator April 1988 Revised August 1999 74F521 8-Bit Identity Comparator General Description T...
Datasheet PDF File 74F521 PDF File

74F521
74F521

Overview
74F521 8-Bit Identity Comparator April 1988 Revised August 1999 74F521 8-Bit Identity Comparator General Description The 74F521 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 Compares two 8-bit words in 6.
5 ns typ s Expandable to any word length s 20-pin package Ordering Code: Order Number 74F521SC 74F521SJ 74F521MSA 74F521PC Package Number M20B M20D MSA20 N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.
300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.
3mm Wide 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.
3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.
300 Wide Devices also available in Tape and Reel.
Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols Connection Diagram IEEE/IEC © 1999 Fairchild Semiconductor Corporation DS009545 www.
fairchildsemi.
com 74F521 Unit Loading/Fan Out U.
L.
Pin Names A0–A7 B0–B7 IA=B OA=B Word A Inputs Word B Inputs Expansion or Enable Input (Active LOW) Identity Output (Active LOW) Description 1.
0/1.
0 1.
0/1.
0 1.
0/1.
0 50/33.
3 Input IIH/IIL HIGH/LOW Output IOH/IOL 20 µA/−0.
6 mA 20 µA/−0.
6 mA 20 µA/−0.
6 mA −1 mA/20 mA 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.
Output A, B A = B (Note 1) A≠B A = B (Note 1) A≠B OA = B L H H H Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
www.
fairchildsemi.
com 2 74F521 Absolute Maximum Ratings(Note 2) Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias VCC Pin Potential to Ground Pin Input Voltage (Note 3) Input Current (Note 3) Voltage Applied to Output in HIGH State (with VCC = 0V)...


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