Datasheet text preview:
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
Y Y Y
eatures
Compares two 8-bit words in 6 5 ns typ Expandable to any word length 20-pin package
F
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 L ote 2 Military grade device with environmental and burn-in processing Use suffix e DMQB
ogic Symbols
IEEE IEC
TL F 9545 1
TL F 9545 4
C TRI-STATE is a registered trademark of National Semiconductor Corporation
1995 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 AB 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
S in Assignment for DIP P OIC 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 2 used to estimate propagation delays
TL F 9545 3
Absolute Maximum Ratings (Note 1)
p If Military Aerospace specified devices are required lease contact the National Semiconductor Sales S Office Distributors for availability and specifications torage Temperature Ambient Temperature under Bias Junction Temperature under Bias Plastic VCC Pin Potential to Ground Pin Input Voltage (Note 2) Input Current (Note 2) Voltage Applied to Output in HIGH State (with VCC e 0V) Standard Output TRI-STATE Output Current Applied to Output in LOW State (Max)
ecommended Operating Conditions
Free Air Ambient Temperature Military Commercial Supply Voltage Military Commercial
b 55
C to a 150 C b 55 C to a 125 C b 55 C to a 175 C b 55 C to a 150 C
b 0 5V to a 7 0V b 0 5V to a 7 0V b 30 mA to a 5 0 mA
b 65
C to a 125 C 0 C to a 70 C
a 4 5V to a 5 5V a 4 5V to a 5 5V
b 0 5V to VCC b 0 5V to a 5 5V
twice the rated IOL (mA)
Note 1 Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired Functional operation under N these conditions is not implied ote 2 Either voltage limit or current limit is sufficient to protect inputs R
DC Electrical Characteristics
Symbol VIH VIL VCD VOH Parameter Min Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Current Input HIGH Current Breakdown Test Output HIGH Leakage Current Input Leakage Test Output Leakage Circuit Current Input LOW Current Output Short-Circuit Current Power Supply Current
b 60
54F 74F Typ Max
Units V 08
b1 2
VCC
Conditions Recognized as a HIGH Signal Recognized as a LOW Signal
20
V V V Min Min
IIN e b18 mA IOH e b1 mA IOH e b1 mA IOH e b1 mA IOL e 20 mA IOL e 20 mA VIN e 2 7V VIN e 7 0V VOUT e VCC IID e 1 9 mA All Other Pins Grounded VIOD e 150 mV All Other Pins Grounded VIN e 0 5V VOUT e 0V VO e HIGH
54F 10% VCC 74F 10% VCC 74F 5% VCC 54F 10% VCC 74F 10% VCC 54F 74F 54F 74F 54F 74F 74F 74F
25 25 27 05 05 20 0 50 100 70 250 50 4 75 3 75
b0 6 b 150
VOL IIH IBVI ICEX VID IOD IIL IOS ICCH
V mA mA mA V mA mA mA mA
Min Max Max Max 00 00 Max Max Max
21
32
3
