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54AC521 Dataheets PDF



Part Number 54AC521
Manufacturers National Semiconductor
Logo National Semiconductor
Description 8-Bit Identity Comparator
Datasheet 54AC521 Datasheet54AC521 Datasheet (PDF)

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 sour.

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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 .


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