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54F521

National Semiconductor
Part Number 54F521
Manufacturer National Semiconductor
Description 8-Bit Identity Comparator
Published Apr 9, 2007
Detailed Description www.DataSheet4U.com 54F 74F521 8-Bit Identity Comparator May 1995 54F 74F521 8-Bit Identity Comparator General Descri...
Datasheet PDF File 54F521 PDF File

54F521
54F521

Overview
www.
DataSheet4U.
com 54F 74F521 8-Bit Identity Comparator May 1995 54F 74F521 8-Bit Identity Comparator General Description The ’F521 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 e B also serves as an active LOW enable input Features Y Y Y Compares two 8-bit words in 6 5 ns typ Expandable to any word length 20-pin package Commercial 74F521PC Military Package Number N20A Package Description 20-Lead (0 300 Wide) Molded Dual-In-Line 20-Lead Ceramic Dual-In-Line 20-Lead (0 300 Wide) Molded Small Outline JEDEC 20-Lead (0 300 Wide) Molded Small Outline EIAJ 20-Lead Molded Shrink Small Outline EIAJ type II 54F521DM (Note 2) 74F521SC (Note 1) 74F521SJ (Note 1) 74F521MSA (Note 1) J20A M20B M20D MSA20 Note 1 Devices also available in 13 reel Use suffix e SCX SJX and MSAX Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB Logic Symbols IEEE IEC TL F 9545 – 1 TL F 9545 – 4 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 9545 RRD-B30M75 Printed in U S A Unit Loading Fan Out 54F 74F Pin Names Description UL HIGH LOW 10 10 10 10 10 10 50 33 3 Input IIH IIL Output IOH IOL 20 mA b0 6 mA 20 mA b0 6 mA 20 mA b0 6 mA b 1 mA 20 mA A 0 – A7 B 0 – B7 IA e B OA e B Word A Inputs Word B Inputs Expansion or Enable Input (Active LOW) Identity Output (Active LOW) Truth Table Inputs IA e B L L H H A B AeB AiB AeB AiB Output OA e B L H H H H e HIGH Voltage Level L e LOW Voltage Level A0 e B0 A1 e B1 A2 e B2 etc Connection Diagrams Pin Assignment for DIP SOIC SSOP and Flatpak Logic Diagram TL F 9545–2 Pin Assignment for LCC TL F 9545 – 5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays TL F 9545–3 2 Absolute Maximum Ratings (Note 1) If Military A...


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