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Details, datasheet, quote on part number:74ACT520PC
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Datasheet text preview:
74AC520 · 74ACT520 8-Bit Identity Comparator
February 1989 Revised November 1999
74AC520 · 74ACT520 8-Bit Identity Comparator
General Description
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.
Features
s Compares two 8-bit words in 6.5 ns typ s Expandable to any word length s 20-pin package s Outputs source/sink 24 mA s ACT520 has TTL-compatible inputs
Ordering Code:
Order Number 74AC520SC 74AC520PC 74ACT520SC 74ACT520SJ 74ACT520PC Package Number M20B N20A M20B M20D N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Body 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Body 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 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 A0A7 B0B7 TA = B OA = B Description Word A Inputs Word B Inputs Expansion or Enable Input Identity Output
FACT is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation
DS010194
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74AC520 · 74ACT520
Truth Table
Inputs IA = B L L H H
H = HIGH Voltage Level L = LOW Voltage Level Note 1: *A0 = B0, A1 = B1, A2 = B 2, etc.
Logic Diagram
Outputs OA = B L H H H A, B A = B (Note 1) A A = B (Note 1) A
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
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74AC520 · 74ACT520
Absolute Maximum Ratings(Note 2)
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) PDIP 140°C ±50 mA -65°C to +150°C ±50 mA -20 mA +20 mA -0.5V to VCC + 0.5V -20 mA +20 mA -0.5V to VCC + 0.5V -0.5V to +7.0V
Recommended Operating Conditions
Supply Voltage (VCC) AC ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 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 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.
2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC -40°C to +85°C
125 mV/ns
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) IIH IIL IOLD IOHD ICC Maximum Input Leakage Current Maximum Input HIGH Leakage Current Maximum Input LOW Leakage Current Minimum Dynamic Output Current (Note 4) Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 5.5 5.5 5.5 2.3 4.0 4.8 -0.3 0.002 0.001 0.001 TA = +25°C Typ 1.5 2.25 2.75 1.5 2.25 2.75 2.99 4.49 5.49 2.1 3.15 3.85 0 .9 1.35 1.65 2.9 4.4 5 .4 2.56 3.86 4.86 0 .1 0 .1 0.1 0.36 0.36 0.36 ±0.1 10.0 -0.6 TA = -40°C to +85°C Guaranteed Limits 2 .1 3.15 3.85 0.9 1.35 1.65 2 .9 4 .4 5 .4 VIN = VIL or VIH 2.46 3.76 4.76 0.1 0.1 0 .1 VIN = VIL or VIH 0.44 0.44 0.44 ±1.0 10.0 -1.0 75 -75 40.0 8.0 µA µA mA mA mA µA mA V IOL = 12 mA IOL = 24 mA IOL = 24 mA (Note 3) VI = VCC, GND, A Inputs Only VI = VCC, B Inputs Only VI = VCC, B Inputs Only VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC VIN = GND V IOUT = 50 µA V IOH = -12 mA IOH = -24 mA IOH = -24 mA (Note 3) V IOUT = -50 µA V VOUT = 0.1V or VCC - 0.1V V Units Conditions VOUT = 0.1V or VCC - 0.1V
ICC (Note 5) Maximum Quiescent Supply Current
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.
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74AC520 · 74ACT520
DC Electrical 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 IIH IIL ICCT IOLD IOHD ICC ICC Maximum Input Leakage Current Maximum Input HIGH Leakage Current Maximum Input LOW Leakage Current Maximum ICC/Input Minimum Dynamic Output Current (Note 7) Maximum Quiescent Supply Current Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 2 .3 4.0 4.8 - 0.3 0 .6 0.001 0 .001 TA = +25°C Typ 1 .5 1 .5 1 .5 1 .5 4.49 5.49 2.0 2.0 0.8 0.8 4.4 5.4 3.86 4.86 0.1 0.1 0.36 0.36 ±0.1 10.0 -0.6 TA = -40°C to +85°C Guaranteed Limits 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 ±1.0 10.0 -1.0 1.5 75 -75 40.0 8.0 µA µA mA mA mA mA µA mA V Units V V V Conditions VOUT = 0.1V or VCC - 0.1V VOUT = 0.1V or VCC - 0.1V IOUT = -50 µA VIN = VIL or VIH V IOH = -24 mA IOH = -24 mA (Note 6) IOUT = 50 µA VIN = VIL or VIH V IOL = 24 mA IOL = 24 mA (Note 6) VI = VCC, GND VI = VCC B Inputs Only VI = VCC B Inputs Only VI = VCC - 2.1V VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or GND VIN = 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.
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74AC520 · 74ACT520
AC Electrical Characteristics for AC
VCC Symbol tPLH tPHL tPLH tP H L Parameter Propagation Delay An or Bn to O A = B Propagation Delay An or Bn to OA = B Propagation Delay IA = B to OA = B Propagation Delay IA = B to OA = B
Note 8: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V
TA = +25°C CL = 50 pF Min 4 .0 2 .5 4.5 3 .0 3.5 2 .5 3.5 2 .5 Typ 7.5 5.5 8.0 5.5 5.5 4.5 5.5 4.5 M ax 11.5 8 .5 12.0 9 .0 8.5 6 .5 8.5 6 .5
TA = -40°C to +85°C CL = 50 pF M in 3 .0 2.0 3 .5 2.5 2 .5 2.0 2 .5 2.0 Max 13.0 9.5 13.5 10.0 9.5 7.0 9.5 7.0 ns ns ns ns Units
(V) (Note 8) 3.3 5.0 3 .3 5.0 3 .3 5.0 3 .3 5.0
AC Electrical Characteristics for ACT
VCC Symbol tPLH tP H L tPLH tP H L Parameter Propagation Delay An or Bn to OA = B Propagation Delay An or Bn to OA = B Propagation Delay IA = B to OA = B Propagation Delay IA = B to OA = B
Note 9: Voltage Range 5.0 is 5.0V ± 0.5V
TA = +25°C CL = 50 pF Min 3 .0 3 .0 2 .0 2 .5 Typ 5.5 6.0 4.0 5.0 Max 8.5 10.0 6.0 7.5
TA = -40°C to +85°C CL = 50 pF Min 2 .5 2 .5 2.0 2.0 Max 9.5 11.5 6 .5 8 .5 ns ns ns ns Units
(V) (Note 9) 5.0 5.0 5.0 5.0
Capacitance
Symbol CIN CPD Parameter Input Capacitance Power Dissipation Capacitance Typ 4 .5 40 Units pF pF VCC = OPEN VCC = 5.0V Conditions
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