54FCT521 8-Bit Identity Comparator General Description Features The ’FCT521 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 Expandable to any word length n Outputs sink capability of 32mA, source capability of 12 mA n TTL input and output level compatible n CMOS power consumption n Standard microcircuit Drawing (SMD) 5962-8854301 Logic Symbols Connection Diagram Pin Assignment for DIP and CERPACK DS100968-1 IEEE/IEC DS100968-2 Pin Assignment for LCC DS100968-4 DS100968-3 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 DS100968 www.national.com 54FCT521 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 DS100968-5 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) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP 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) −65˚C to +150˚C 175˚C Recommended Operating Conditions −0.5V to +7.0V −20 mA +20 mA −0.5V to VCC + 0.5V Supply Voltage (VCC) FCT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 54FCT −20 mA +20 mA −0.5V to VCC + 0.5V 4.5V to 5.5V 0V to VCC 0V to VCC −55˚C to +125˚C 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. National does not recommend operation of FACT™ circuits outside databook specifications. ± 50 mA ± 50 mA DC Electrical Characteristics for ’FCT Family Devices Symbol Parameter 54FCT Min Units VIH Input HIGH Voltage VIL Input LOW Voltage 0.8 V VCD Input Clamp Diode Voltage −1.2 V VOH Output HIGH Voltage VOL Output LOW Voltage IIH Input HIGH Current VCC Conditions Max 2.0 V Recognized HIGH Signal Min 54FCT 4.3 V Min 54FCT 2.4 V Min 54FCT 0.2 V Min 54FCT 0.5 V Min 5 µA Max Recognized LOW Signal IIN = −18 mA IOH = −300 µA IOH = −12 mA IOL = 300 µA IOL = 32 mA VIN = VCC VIN = 0.0V VOUT = 0.0V IIL Input LOW Current −5 µA Max IOS Output Short-Circuit Current -60 mA Max ICCQ Quiescent Power Supply Current 1.5 mA Max ∆ICC Quiescent Power Supply Current 2.0 mA Max ICCD Dynamic ICC 0.25 mA/ MHz Max VCC = 5.5V, Outputs Open, One Bit Toggling, 50% Duty Cycle, OEn = GND ICC Total Power Supply Current 5.0 mA Max VCC = 5.5V, Outputs Open, fI = 10MHz, OEn = GND, One Bit Toggling, 50% Duty Cycle VIN < 0.2V or VIN 5.3V, VCC = 5.5V VI = VCC − 2.1V 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. 3 www.national.com AC Electrical Characteristics for ’FCT Family Devices Symbol Parameter TA = −55˚C to +125˚C CL = 50 pF VCC (V) tPLH Propagation Delay An or Bn to OA tPHL tPLH tPHL = B to OA = B to OA Max 5.0 1.5 15.0 ns 5.0 1.5 15.0 ns 5.0 1.5 9.0 ns 5.0 1.5 9.0 ns = B Propagation Delay IA Min = B Propagation Delay IA (Note 5) = B Propagation Delay An or Bn to OA Units = B Note 5: Voltage Range 5.0 is 5.0V ± 0.5V Capacitance Typ Units CIN Symbol Input Capacitance 4.5 pF CPD Power Dissipation Capacitance 40 pF www.national.com Parameter 4 Conditions VCC = OPEN VCC = 5.0V Applications Ripple Expansion DS100968-6 Parallel Expansion DS100968-7 5 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Ceramic Leadless Chip Carrier Package Number E20A www.national.com 6 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Ceramic Dual-in-line J20A 20-Lead Cerpack Package Number W20A 7 www.national.com 54FCT521 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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