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 FACTTM is a trademark of Fairchild Semiconductor Corporation. (c) 2001 National Semiconductor Corporation DS100234 www.national.com 54AC520 * 54ACT520 8-Bit Identity Comparator September 1998 54AC520 * 54ACT520 Connection Diagrams Pin Assignment for DIP and Flatpak Pin Assignment for LCC DS100234-3 DS100234-2 Inputs IA = B L L H H A, B Outputs OA = B A = B* AB H A = B* AB H L H H = HIGH Voltage Level L = LOW Voltage Level *A0 = B0, A1 = B1, A2 = B2, etc. www.national.com 2 54AC520 * 54ACT520 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 54AC520 * 54ACT520 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 -65C to +150C 2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC -55C to +125C 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 FACTTM circuits outside databook specifications. 175C DC Characteristics for 'AC Family Devices 54AC Symbol Parameter VCC (V) TA = Units Conditions -55C to +125C Guaranteed Limits VIH Minimum High Level Input Voltage VIL VOH 3.0 2.1 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 VOUT = 0.1V V or VCC - 0.1V IOUT = -50 A V (Note 2) VIN = VILor VIH VOL Maximum Low Level Output Voltage 3.0 2.4 4.5 3.7 IOH = -12 mA V IOH = -24 mA 5.5 4.7 IOH = -24 mA 3.0 0.1 IOUT = 50 A 4.5 0.1 5.5 0.1 V (Note 2) VIN = VILor VIH IIN Maximum Input 3.0 0.50 4.5 0.50 IOL = 12 mA 5.5 0.50 5.5 1.0 A VI = VCC, GND 5.5 20.0 A VI = VCC V IOL = 24 mA Leakage Current IIH Maximum Input A Inputs Only High Leakage Current www.national.com IOL = 24 mA B Inputs Only 4 (Continued) 54AC Symbol Parameter VCC TA = (V) -55C to +125C Units Conditions Guaranteed Limits IIL Maximum Input 5.5 -1.5 mA VI = VCC Low Leakage Current B Inputs Only IOLD Minimum Dynamic (Note 3) 5.5 50 mA VOLD = 1.65V Max IOHD Output Current 5.5 -50 mA VOHD = 3.85V Min ICC Maximum Quiescent 5.5 80.0 A 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 54ACT Symbol Parameter VCC TA = (V) -55C to +125C 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 or VCC - 0.1V V VOUT = 0.1V V IOUT = -50 A or VCC - 0.1V (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 IOUT = 50 A IOH = -24 mA (Note 4) VIN = VILor VIH IIN Maximum Input 4.5 0.50 5.5 0.50 V IOL = 24 mA 5.5 1.0 A VI = VCC, GND 5.5 10.0 A VI = VCC 5.5 -1.0 mA VI = VCC 5.5 1.6 mA VI = VCC - 2.1V 5.5 50 mA VOLD = 1.65V Max IOL = 24 mA Leakage Current IIH Maximum Input High Leakage Current IIL Maximum Input B Inputs Only Low Leakage Current B Inputs Only ICCT Maximum IOLD Minimum Dynamic (Note 5) IOHD Output Current 5.5 -50 mA VOHD = 3.85V Min ICC Maximum Quiescent 5.5 80.0 A VIN = VCC ICC/Input Supply Current or GND 5 www.national.com 54AC520 * 54ACT520 DC Characteristics for 'AC Family Devices 54AC520 * 54ACT520 DC Characteristics for 'ACT Family Devices (Continued) 54ACT Symbol Parameter VCC TA = (V) -55C to +125C 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 Symbol tPLH tPHL Parameter tPHL TA = -55C (V) to +125C (Note 6) CL = 50 pF Fig. Units Min Max Propagation Delay 3.3 1.0 14.0 An or Bn to OA = B 5.0 1.5 10.5 Propagation Delay 3.3 1.0 15.0 An or Bn to OA tPLH VCC = B 5.0 1.5 11.0 Propagation Delay 3.3 1.0 10.0 IA 5.0 1.5 7.5 Propagation Delay 3.3 1.0 10.5 IA 5.0 1.5 8.0 = B to OA = B to OA = B = 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 VCC Symbol tPLH Parameter Propagation Delay An or Bn to OA tPHL tPLH tPHL = B to OA = B to OA Min Max 5.0 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 Note 7: Voltage Range 5.0 is 5.0V 0.5V Capacitance Symbol Typ Units CIN Input Capacitance 4.5 pF VCC = OPEN CPD Power Dissipation Capacitance 40 pF VCC = 5.0V www.national.com Units = B Propagation Delay IA to +125C CL = 50 pF = B Propagation Delay IA (V) (Note 7) Fig. = B Propagation Delay An or Bn to OA TA = -55C Parameter 6 Conditions No. 54AC520 * 54ACT520 Applications Ripple Expansion DS100234-6 Parallel Expansion DS100234-7 7 www.national.com 54AC520 * 54ACT520 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 www.national.com 8 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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. 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