54AC521 • 54ACT521 8-Bit Identity Comparator General Description Features The AC/ACT521 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. n n n n n n Logic Symbols Connection Diagram ICC reduced by 50% Compares two 8-bit words in 6.5 ns typ Expandable to any word length Outputs source/sink 24 mA ACT521 has TTL-compatible inputs Standard microcircuit Drawing (SMD) 54AC521: 5962-90985 54ACT521: 5962-89793 Pin Assignment for DIP and CERPACK DS100291-1 IEEE/IEC DS100291-2 Pin Assignment for LCC DS100291-4 DS100291-3 Pin Descriptions 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 DS100291 www.national.com 54AC521 • 54ACT521 8-Bit Identity Comparator September 1998 Truth Table Inputs IA = B L L H H Outputs A, B A = B (Note 1) A≠B A = B (Note 1) A≠B OA = B L H H H H = HIGH Voltage Level L = LOW Voltage Level Note 1: A0 = B0, A1 = B1, A2 = B2, etc. Logic Diagram DS100291-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com 2 Absolute Maximum Ratings (Note 2) 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 2: 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, output/input loading variables. Fairchild does not recommend operation of FACT™ circuits outside databook specifications. 175˚C DC Electrical Characteristics for AC Symbol VIH VIL VOH Parameter VCC TA = −55˚C to +125˚C (V) Guaranteed Limits 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 Units Conditions VOUT = 0.1V V or VCC − 0.1V V or VCC − 0.1V VOUT = 0.1V IOUT = −50 µA Minimum High Level 3.0 2.9 Output Voltage 4.5 4.4 5.5 5.4 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 3.0 0.4 4.5 0.5 5.5 0.5 5.5 ± 1.0 µA VI = V VOLD = 1.65V Max V VIN = V VOL V Maximum Input (Note 5) Leakage Current IOLD Minimum Dynamic Output Current (Note 4) IOHD ICC Maximum Quiescent (Note 5) Supply Current or VIH IOH = −24 mA IOH = −24 mA (Note 3) IOUT = 50 µA V VIN = V IIN IL IOH = −4 mA IL or VIH IOL = 12 mA V IOL = 24 mA IOL = 24 mA (Note 3) CC, GND 5.5 50 mA 5.5 −50 mA VOHD = 3.85V Min 5.5 80.0 µA VIN = V CC or GND Note 3: All outputs loaded; thresholds on input associated with output under test. Note 4: Maximum test duration 2.0 ms, one output loaded at a time. Note 5: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC. 3 www.national.com DC Electical Characteristics for ACT Symbol VIH VIL VOH Parameter VCC TA = −55˚C to +125˚C (V) Guaranteed Limits 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 4.5 3.7 Units Conditions VOUT = 0.1V V or VCC − 0.1V VOUT = 0.1V V or VCC − 0.1V IOUT = −50 µA V VIN = V VOL 5.5 4.7 Maximum Low Level 4.5 0.1 Output Voltage 5.5 0.1 4.5 0.5 V Maximum Input or VIH IOH = −24 mA (Note 6) IOUT = 50 µA V VIN = V IIN IL IOH = −24 mA V IL or VIH IOL = 24 mA IOL = 24 mA (Note 6) 5.5 0.5 5.5 ± 1.0 µA VI = V CC, GND 5.5 1.5 mA VI = V CC − 2.1V Leakage Current ICCT Maximum ICC/Input IOLD IOHD ICC Minimum Dynamic Output Current (Note 7) Maximum Quiescent 5.5 50 mA VOLD = 1.65V Max 5.5 −50 mA VOHD = 3.85V Min 5.5 80.0 µA VIN = V Supply Current CC or GND Note 6: All outputs loaded; thresholds on input associated with output under test. Note 7: Maximum test duration 2.0 ms, one output loaded at a time. AC Electrical Characteristics for AC Symbol tPLH tPHL tPLH Parameter TA = −55˚C to +125˚C (V) CL = 50 pF (Note 8) Min 3.3 1.0 15.0 An or Bn to OA 5.0 1.0 11.0 = B Max Propagation Delay 3.3 1.0 10.5 An or Bn to OA 5.0 1.0 8.0 = B Propagation Delay = B to OA = B Propagation Delay IA = B to OA = B 3.3 1.0 15.0 5.0 1.0 11.0 3.3 1.0 10.5 5.0 1.0 8.0 Note 8: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V www.national.com Units Propagation Delay IA tPHL VCC 4 ns ns ns ns AC Electrical Characteristics for ACT Symbol tPLH Parameter Propagation Delay An or Bn to OA tPHL tPLH tPHL = B to OA = B to OA Units (Note 9) Min Max 5.0 1.5 11.0 ns 5.0 1.5 12.0 ns 5.0 1.5 7.5 ns 5.0 1.5 8.5 ns = B Propagation Delay IA CL = 50 pF = B Propagation Delay IA TA = −55˚C to +125˚C (V) = B Propagation Delay An or Bn to OA VCC = B Note 9: Voltage Range 5.0 is 5.0V ± 0.5V Capacitance Typ Units CIN Symbol Input Capacitance Parameter 4.5 pF VCC = OPEN CPD Power Dissipation Capacitance 40 pF VCC = 5.0V 5 Conditions www.national.com Applications Ripple Expansion DS100291-6 Parallel Expansion DS100291-7 www.national.com 6 7 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Ceramic Leadless Chip Carrier Package Number E20A www.national.com 8 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Ceramic Dual-in-line J20A 20-Lead Cerpack Package Number W20A 9 www.national.com 54AC521 • 54ACT521 8-Bit Identity Comparator 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. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. ure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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