8-Bit Identity Comparator

www.DataSheet4U.com 54AC521 • 54ACT521 8-Bit Identity Comparator September 1998 54AC521 • 54ACT521 8-Bit Identity Comparator General Description 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. Features n n n n n n 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 Logic Symbols Connection Diagram Pin Assignment for DIP and CERPACK DS100291-1 IEEE/IEC DS100291-2 Pin Assignment for LCC DS100291-4 DS100291-3 Pin Descriptions Pin Names A0–A7 B0–B7 TA = B OA = B Word A Inputs Word B Inputs Expansion or Enable Input Identity Output Description FACT™ is a trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100291 www.national.com Truth Table Inputs IA = B L L H H H = HIGH Voltage Level L = LOW Voltage Level Note 1: A0 = B0, A1 = B1, A2 = B2, etc. Outputs A, B OA = B L H H H A = B (Note 1) A≠B A = B (Note 1) A≠B 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) 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 −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 Recommended Operating Conditions 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 2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC −55˚C to +125˚C 125 mV/ns ± 50 mA ± 50 mA −65˚C to +150˚C 175˚C 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. DC Electrical Characteristics for AC Symbol VIH Parameter Minimum High Level Input Voltage VIL Maximum Low Level Input Voltage VOH Minimum High Level Output Voltage VCC (V) 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 VOL Maximum Low Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 IIN (Note 5) IOLD IOHD ICC (Note 5) Maximum Input Leakage Current Minimum Dynamic Output Current (Note 4) Maximum Quiescent Supply Current 5.5 5.5 5.5 50 −50 80.0 mA mA µA VOLD = 1.65V Max VOHD = 3.85V Min VIN = V or GND CC TA = −55˚C to +125˚C Guaranteed Limits 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 Units Conditions VOUT = 0.1V V or VCC − 0.1V VOUT = 0.1V V or VCC − 0.1V IOUT = −50 µA V VIN = V or VIH IL 2.4 3.7 4.7 0.1 0.1 0.1 V V IOH = −4 mA IOH = −24 mA IOH = −24 mA (Note 3) IOUT = 50 µA VIN = V 0.4 0.5 0.5 V µA IL or VIH IOL = 12 mA IOL = 24 mA IOL = 24 mA (Note 3) VI = V CC, 5.5 ± 1.0 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 Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage VCC (V) 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Maximum Low Level Output Voltage 4.5 5.5 4.5 5.5 IIN ICCT IOLD IOHD ICC Maximum Input Leakage Current Maximum ICC/Input Minimum Dynamic Output Current (Note 7) Maximum Quiescent Supply Current 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. TA = −55˚C to +125˚C Guaranteed Limits 2.0 2.0 0.8 0.8 4.4 5.4 Units V V V Conditions VOUT = 0.1V or VCC − 0.1V VOUT = 0.1V or VCC − 0.1V IOUT = −50 µA VIN = V or VIH IL 3.7 4.7 0.1 0.1 V V IOH = −24 mA IOH = −24 mA (Note 6) IOUT = 50 µA VIN = V or VIH IL 0.5 0.5 V µA mA mA mA µA IOL = 24 mA IOL = 24 mA (Note 6) VI = V VI = V CC, 5.5 5.5 5.5 5.5 5.5 ± 1.0 1.5 50 −50 80.0 GND − 2.1V CC VOLD = 1.65V Max VOHD = 3.85V Min VIN = V or GND CC AC Electrical Characteristics for AC Symbol Parameter VCC (V) (Note 8) tPLH tPHL tPLH tPHL Propagation Delay An or Bn to OA An or Bn to OA IA IA to OA to OA = B TA = −55˚C to +125˚C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 15.0 11.0 10.5 8.0 15.0 11.0 10.5 8.0 Units 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 ns ns ns ns Propagation Delay = B Propagation Delay = B = B Propagation Delay = B = B Note 8: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V www.national.com 4 AC Electrical Characteristics for ACT Symbol Parameter VCC (V) (Note 9) tPLH tPHL tPLH tPHL Propagation Delay An or Bn to OA An or Bn to OA IA IA to OA to OA = B TA = −55˚C to +125˚C CL = 50 pF Min 1.5 1.5 1.5 1.5 Max 11.0 12.0 7.5 8.5 Units 5.0 5.0 5.0 5.0 ns ns ns ns Propagation Delay = B Propagation Delay = B = B Propagation Delay = B = B Note 9: Voltage Range 5.0 is 5.0V ± 0.5V Capacitance Symbol CIN CPD Parameter Input Capacitance Power Dissipation Capacitance Typ 4.5 40 Units pF pF Conditions VCC = OPEN VCC = 5.0V 5 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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