74AC520PC PDF даташит
Спецификация 74AC520PC изготовлена «Fairchild Semiconductor» и имеет функцию, называемую «8-Bit Identity Comparator». |
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Детали детали
Номер произв | 74AC520PC |
Описание | 8-Bit Identity Comparator |
Производители | Fairchild Semiconductor |
логотип |
8 Pages
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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 Package Number
Package Description
74AC520SC
M20B
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
A0–A7
B0–B7
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
www.fairchildsemi.com
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Truth Table
Inputs
IA = B
A, B
L A = B (Note 1)
L A≠Β
H A = B (Note 1)
H A≠Β
H = HIGH Voltage Level
L = LOW Voltage Level
Note 1: *A0 = B0, A1 = B1, A2 = B2, etc.
Outputs
OA = B
L
H
H
H
Logic Diagram
Applications
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
Ripple Expansion
Parallel Expansion
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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
−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
±50 mA
±50 mA
−65°C to +150°C
140°C
Recommended Operating
Conditions
Supply Voltage (VCC)
AC
2.0V to 6.0V
ACT 4.5V to 5.5V
Input Voltage (VI)
Output Voltage (VO)
Operating Temperature (TA)
Minimum Input Edge Rate (∆V/∆t)
0V to VCC
0V to VCC
−40°C to +85°C
AC Devices
VIN from 30% to 70% of VCC
VCC @ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (∆V/∆t)
125 mV/ns
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, with-
out 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
Parameter
VCC
TA = +25°C
TA = −40°C to +85°C
Units
(V) Typ
Guaranteed Limits
Conditions
VIH Minimum HIGH Level
Input Voltage
3.0 1.5 2.1
2.1
VOUT = 0.1V
4.5 2.25 3.15 3.15 V or VCC − 0.1V
5.5 2.75 3.85
3.85
VIL Maximum LOW Level
Input Voltage
3.0 1.5 0.9
0.9
VOUT = 0.1V
4.5 2.25 1.35 1.35 V or VCC − 0.1V
5.5 2.75 1.65
1.65
VOH Minimum HIGH Level
Output Voltage
3.0 2.99 2.9
4.5 4.49 4.4
5.5 5.49 5.4
2.9
4.4 V IOUT = −50 µA
5.4
VOL Maximum LOW Level
Output Voltage
3.0 2.56
4.5 3.86
5.5 4.86
3.0 0.002 0.1
4.5 0.001 0.1
5.5 0.001 0.1
2.46
3.76
4.76
0.1
0.1
0.1
VIN = VIL or VIH
IOH = −12 mA
V IOH = −24 mA
IOH = −24 mA (Note 3)
V IOUT = 50 µA
3.0
4.5
5.5
IIN (Note 5) Maximum Input Leakage Current
5.5
IIH Maximum Input HIGH Leakage Current 5.5
IIL
Maximum Input LOW Leakage Current 5.5
−0.3
IOLD
Minimum Dynamic
5.5
IOHD
Output Current (Note 4)
5.5
ICC
Maximum Quiescent Supply Current
5.5
ICC (Note 5) Maximum Quiescent Supply Current 5.5 2.3
Note 3: All outputs loaded; thresholds on input associated with output under test.
0.36
0.36
0.36
±0.1
10.0
−0.6
4.0
4.8
0.44
0.44
0.44
±1.0
10.0
−1.0
75
−75
40.0
8.0
VIN = VIL or VIH
IOL = 12 mA
V IOL = 24 mA
IOL = 24 mA (Note 3)
µA VI = VCC, GND, A Inputs Only
µA VI = VCC, B Inputs Only
mA VI = VCC, B Inputs Only
mA VOLD = 1.65V Max
mA VOHD = 3.85V Min
µA VIN = VCC
mA VIN = GND
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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