54AC520 • 54ACT520 8-Bit Identity Comparator 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. n n n n n Expandable to any word length 20-pin package Outputs source/sink 24 mA ’ACT520 has TTL-compatible inputs Standard Microcircuit Drawing (SMD) 54AC520: 5962-90916 54ACT520: 5962-89793 Features n Compares two 8-bit words in 6.5 ns typ Logic Symbols IEEE/IEC DS100234-1 DS100234-4 Pin Names Description A0–A7 Word A Inputs B0–B7 Word B Inputs TA = B Expansion or Enable Input OA = B Identity Output FACT™ is a trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100234 www.national.com 54AC520 • 54ACT520 8-Bit Identity Comparator September 1998 Connection Diagrams Pin Assignment for DIP and Flatpak Pin Assignment for LCC DS100234-3 DS100234-2 Truth Table Inputs IA = B Outputs A, B A = B* OA = B H H A≠B A = B* H H A≠B H L L L H = HIGH Voltage Level L = LOW Voltage Level *A0 = B0, A1 = B1, A2 = B2, etc. www.national.com 2 Logic Diagram DS100234-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 3 www.national.com Absolute Maximum Ratings (Note 1) Recommended Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DC Input Diode Current (IIK) VI = −0.5V VI = VCC + 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = −0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP Supply Voltage (VCC) ’AC ’ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 54AC/ACT Minimum Input Edge Rate (∆V/∆t) ’AC Devices VIN from 30% to 70% of VCC VCC @ 3.3V, 4.5V, 5.5V Minimum Input Edge Rate (∆V/∆t) ’ACT Devices VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V −0.5V to +7.0V −20 mA +20 mA −0.5V to VCC + 0.5V −20 mA +20 mA −0.5V to VCC + 0.5V ± 50 mA ± 50 mA −65˚C to +150˚C 2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC −55˚C to +125˚C 125 mV/ns 125 mV/ns Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. National does not recommend operation of FACT™ circuits outside databook specifications. 175˚C DC Characteristics for ’AC Family Devices Symbol Parameter VCC 54AC TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits VIH VIL VOH Minimum High Level 3.0 2.1 Input Voltage 4.5 3.15 5.5 3.85 Maximum Low Level 3.0 0.9 Input Voltage 4.5 1.35 5.5 1.65 Minimum High Level 3.0 2.9 Output Voltage 4.5 4.4 5.5 5.4 VOUT = 0.1V V or VCC − 0.1V V or VCC − 0.1V VOUT = 0.1V IOUT = −50 µA V (Note 2) VIN = VILor VIH VOL 3.0 2.4 4.5 3.7 5.5 4.7 Maximum Low Level 3.0 0.1 Output Voltage 4.5 0.1 5.5 0.1 IOH = −12 mA V IOH = −24 mA IOH = −24 mA IOUT = 50 µA V (Note 2) VIN = VILor VIH IIN Maximum Input 3.0 0.50 4.5 0.50 IOL = 12 mA V IOL = 24 mA 5.5 0.50 5.5 ± 1.0 µA IOL = 24 mA VI = VCC, GND 5.5 20.0 µA A Inputs Only VI = VCC Leakage Current IIH Maximum Input High Leakage Current www.national.com B Inputs Only 4 DC Characteristics for ’AC Family Devices Symbol Parameter (Continued) VCC 54AC TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits IIL Maximum Input 5.5 −1.5 mA VI = VCC 5.5 50 mA B Inputs Only VOLD = 1.65V Max Low Leakage Current IOLD Minimum Dynamic (Note 3) IOHD Output Current 5.5 −50 mA ICC Maximum Quiescent 5.5 80.0 µA VOHD = 3.85V Min VIN = VCC 5.5 8.0 mA VIN = GND Supply Current ICC Maximum Quiescent Supply Current Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time. DC Characteristics for ’ACT Family Devices Symbol Parameter VCC 54ACT TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits VIH VIL VOH Minimum High Level 4.5 2.0 Input Voltage 5.5 2.0 Maximum Low Level 4.5 0.8 Input Voltage 5.5 0.8 Minimum High Level 4.5 4.4 Output Voltage 5.5 5.4 V VOUT = 0.1V V or VCC − 0.1V VOUT = 0.1V V or VCC − 0.1V IOUT = −50 µA (Note 4) VIN = VILor VIH VOL 4.5 3.70 5.5 4.70 Maximum Low Level 4.5 0.1 Output Voltage 5.5 0.1 V IOH = −24 mA V IOH = −24 mA IOUT = 50 µA (Note 4) VIN = VILor VIH IIN Maximum Input 4.5 0.50 5.5 0.50 V IOL = 24 mA ± 1.0 µA IOL = 24 mA VI = VCC, GND 5.5 5.5 10.0 µA VI = VCC 5.5 −1.0 mA B Inputs Only VI = VCC 5.5 1.6 mA B Inputs Only VI = VCC − 2.1V 5.5 50 mA VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC Leakage Current IIH Maximum Input High Leakage Current IIL Maximum Input Low Leakage Current ICCT Maximum ICC/Input IOLD Minimum Dynamic (Note 5) IOHD Output Current 5.5 −50 mA ICC Maximum Quiescent 5.5 80.0 µA Supply Current or GND 5 www.national.com DC Characteristics for ’ACT Family Devices Symbol Parameter (Continued) VCC 54ACT TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits ICC Maximum Quiescent 5.5 8.0 mA VIN = GND Supply Current Note 4: All outputs loaded; thresholds on input associated with output under test. Note 5: Maximum test duration 2.0 ms, one output loaded at a time. AC Electrical Characteristics 54AC TA = −55˚C VCC Symbol Parameter (V) (Note 6) Min tPLH tPHL tPLH tPHL Fig. to +125˚C CL = 50 pF Units Max Propagation Delay 3.3 1.0 14.0 An or Bn to OA 5.0 1.5 10.5 = B Propagation Delay 3.3 1.0 15.0 An or Bn to OA 5.0 1.5 11.0 = B Propagation Delay 3.3 1.0 10.0 IA 5.0 1.5 7.5 = B to OA = B Propagation Delay 3.3 1.0 10.5 IA 5.0 1.5 8.0 = B to OA = B No. ns ns ns ns Note 6: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V AC Electrical Characteristics 54ACT TA = −55˚C VCC Symbol Parameter (V) (Note 7) tPLH Propagation Delay An or Bn to OA tPHL tPLH tPHL = B to OA = B to OA Max 1.5 12.0 ns 5.0 1.5 12.0 ns 5.0 1.5 8.5 ns 5.0 1.5 9.0 ns = B Propagation Delay IA Min 5.0 = B Propagation Delay IA = B Note 7: Voltage Range 5.0 is 5.0V ± 0.5V Capacitance Symbol Typ Units CIN Input Capacitance 4.5 pF CPD Power Dissipation Capacitance 40 pF www.national.com Units = B Propagation Delay An or Bn to OA Fig. to +125˚C CL = 50 pF Parameter 6 Conditions VCC = OPEN VCC = 5.0V No. Applications Ripple Expansion DS100234-6 Parallel Expansion DS100234-7 7 www.national.com 8 Physical Dimensions inches (millimeters) unless otherwise noted 20 Terminal Ceramic Leadless Chip Carrier (L) NS Package Number E20A 20 Lead Ceramic Dual-In-Line Package (D) NS Package Number J20A 9 www.national.com 54AC520 • 54ACT520 8-Bit Identity Comparator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20 Lead Ceramic Flatpak (F) NS Package Number W20A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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