Revised November 1999 74AC520 • 74ACT520 8-Bit Identity Comparator General Description Features 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. ■ Compares two 8-bit words in 6.5 ns typ ■ Expandable to any word length ■ 20-pin package ■ Outputs source/sink 24 mA ■ ACT520 has TTL-compatible inputs Ordering Code: Order Number Package Number 74AC520SC M20B Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body 74AC520PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide 74ACT520SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body 74ACT520SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74ACT520PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code. Logic Symbols Connection Diagram IEEE/IEC 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. © 1999 Fairchild Semiconductor Corporation DS010194 www.fairchildsemi.com 74AC520 • 74ACT520 8-Bit Identity Comparator February 1989 74AC520 • 74ACT520 Truth Table Logic Diagram Inputs IA = B A, B Outputs OA = B L A = B (Note 1) L L A≠Β H H A = B (Note 1) H H A≠Β H H = HIGH Voltage Level L = LOW Voltage Level Note 1: *A0 = B0, A1 = B1, A2 = B 2, etc. Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Applications Ripple Expansion Parallel Expansion www.fairchildsemi.com 2 Recommended Operating Conditions −0.5V to +7.0V Supply Voltage (VCC) DC Input Diode Current (IIK) VI = −0.5V −20 mA VI = VCC + 0.5V +20 mA Supply Voltage (VCC) −0.5V to VCC + 0.5V DC Input Voltage (VI) VO = VCC + 0.5V +20 mA 0V to VCC −40°C to +85°C Minimum Input Edge Rate (∆V/∆t) AC Devices DC Output Source VIN from 30% to 70% of VCC ±50 mA VCC @ 3.3V, 4.5V, 5.5V DC VCC or Ground Current 125 mV/ns Minimum Input Edge Rate (∆V/∆t) ±50 mA per Output Pin (ICC or IGND) Storage Temperature (TSTG) 0V to VCC Operating Temperature (TA) −0.5V to VCC + 0.5V or Sink Current (IO) 4.5V to 5.5V Output Voltage (VO) −20 mA DC Output Voltage (VO) 2.0V to 6.0V ACT Input Voltage (VI) DC Output Diode Current (IOK) VO = −0.5V AC ACT Devices −65°C to +150°C VIN from 0.8V to 2.0V Junction Temperature (TJ) VCC @ 4.5V, 5.5V PDIP 140°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, and output/input loading variables. Fairchild does not recommend operation of FACT circuits outside databook specifications. DC Electrical Characteristics for AC Symbol VIH VIL VOH Parameter VCC TA = +25°C TA = −40°C to +85°C (V) Typ Guaranteed Limits Minimum HIGH Level 3.0 1.5 Input Voltage 4.5 2.25 3.15 3.15 5.5 2.75 3.85 3.85 2.1 Units Maximum LOW Level 3.0 1.5 0.9 0.9 Input Voltage 4.5 2.25 1.35 1.35 5.5 2.75 1.65 1.65 Minimum HIGH Level 3.0 2.99 2.9 2.9 Output Voltage 4.5 4.49 4.4 4.4 5.5 5.49 5.4 5.4 3.0 2.56 2.46 4.5 3.86 3.76 5.5 4.86 4.76 Conditions VOUT = 0.1V 2.1 V or VCC − 0.1V VOUT = 0.1V V or VCC − 0.1V V IOUT = −50 µA VIN = VIL or VIH VOL Maximum LOW Level 3.0 0.002 0.1 0.1 Output Voltage 4.5 0.001 0.1 0.1 5.5 0.001 0.1 0.1 0.36 0.44 IOH = −12 mA V IOH = −24 mA IOH = −24 mA (Note 3) V IOUT = 50 µA VIN = VIL or VIH 3.0 4.5 0.36 0.44 5.5 0.36 0.44 IOL = 12 mA V IOL = 24 mA IOL = 24 mA (Note 3) IIN (Note 5) Maximum Input Leakage Current 5.5 ±0.1 ±1.0 µA VI = VCC, GND, A Inputs Only IIH Maximum Input HIGH Leakage Current 5.5 10.0 10.0 µA VI = VCC, B Inputs Only IIL Maximum Input LOW Leakage Current 5.5 −0.6 −1.0 mA VI = VCC, B Inputs Only IOLD Minimum Dynamic 5.5 75 mA VOLD = 1.65V Max IOHD Output Current (Note 4) 5.5 ICC Maximum Quiescent Supply Current 5.5 ICC (Note 5) Maximum Quiescent Supply Current 5.5 −0.3 2.3 −75 mA VOHD = 3.85V Min 4.0 40.0 µA VIN = VCC 4.8 8.0 mA VIN = 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.fairchildsemi.com 74AC520 • 74ACT520 Absolute Maximum Ratings(Note 2) 74AC520 • 74ACT520 DC Electrical Characteristics for ACT Symbol VIH VIL VOH Parameter Minimum HIGH Level TA = +25°C VCC (V) Typ 4.5 1.5 TA = −40°C to +85°C Guaranteed Limits 2.0 2.0 Input Voltage 5.5 1.5 2.0 2.0 Maximum LOW Level 4.5 1.5 0.8 0.8 Input Voltage 5.5 1.5 0.8 0.8 Minimum HIGH Level 4.5 4.49 4.4 4.4 Output Voltage 5.5 5.49 5.4 5.4 3.86 3.76 Units V V Conditions VOUT = 0.1V or VCC − 0.1V VOUT = 0.1V or VCC − 0.1V V IOUT = −50 µA V IOH = −24 mA VIN = VIL or VIH 4.5 5.5 VOL IOH = −24 mA (Note 6) 4.86 4.76 Maximum LOW Level 4.5 0.001 0.1 0.1 Output Voltage 5.5 0.001 0.1 0.1 4.5 0.36 0.44 5.5 0.36 0.44 5.5 ±0.1 ±1.0 µA 5.5 10.0 10.0 µA V IOUT = 50 µA V IOL = 24 mA VIN = VIL or VIH IIN Maximum Input Leakage Current IIH Maximum Input HIGH Leakage Current IIL Maximum Input LOW Leakage Current ICCT Maximum 5.5 −0.3 5.5 0.6 −0.6 −1.0 IOL = 24 mA (Note 6) mA VI = VCC, GND VI = VCC B Inputs Only VI = VCC B Inputs Only 1.5 mA VI = VCC − 2.1V IOLD Minimum Dynamic 5.5 75 mA VOLD = 1.65V Max IOHD Output Current (Note 7) 5.5 −75 mA VOHD = 3.85V Min ICC Maximum Quiescent 4.0 40.0 µA 4.8 8.0 mA ICC/Input Supply Current ICC Maximum Quiescent Supply Current 5.5 5.5 2.3 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. www.fairchildsemi.com 4 VIN = VCC or GND VIN = GND Symbol Parameter tPLH tPHL tPLH tPHL VCC TA = +25°C (V) CL = 50 pF TA = −40°C to +85°C CL = 50 pF Units (Note 8) Min Typ Max Min Max Propagation Delay 3.3 4.0 7.5 11.5 3.0 13.0 An or Bn to O A = B 5.0 2.5 5.5 8.5 2.0 9.5 Propagation Delay 3.3 4.5 8.0 12.0 3.5 13.5 An or Bn to OA = B 5.0 3.0 5.5 9.0 2.5 10.0 Propagation Delay 3.3 3.5 5.5 8.5 2.5 9.5 IA = B to OA = B 5.0 2.5 4.5 6.5 2.0 7.0 Propagation Delay 3.3 3.5 5.5 8.5 2.5 9.5 IA = B to OA = B 5.0 2.5 4.5 6.5 2.0 7.0 ns ns ns ns Note 8: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V AC Electrical Characteristics for ACT Symbol Parameter Propagation Delay tPLH An or Bn to OA = B tPHL Propagation Delay An or Bn to OA = B tPLH Propagation Delay IA = B to OA = B tPHL Propagation Delay IA = B to OA = B VCC TA = +25°C (V) CL = 50 pF TA = −40°C to +85°C CL = 50 pF Units (Note 9) Min Typ Max Min Max 5.0 3.0 5.5 8.5 2.5 9.5 ns 5.0 3.0 6.0 10.0 2.5 11.5 ns 5.0 2.0 4.0 6.0 2.0 6.5 ns 5.0 2.5 5.0 7.5 2.0 8.5 ns 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.fairchildsemi.com 74AC520 • 74ACT520 AC Electrical Characteristics for AC 74AC520 • 74ACT520 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body Package Number M20B www.fairchildsemi.com 6 74AC520 • 74ACT520 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 7 www.fairchildsemi.com 74AC520 • 74ACT520 8-Bit Identity Comparator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Package Number N20A Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. 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