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74AC521SC PDF даташит

Спецификация 74AC521SC изготовлена ​​​​«Fairchild Semiconductor» и имеет функцию, называемую «8-Bit Identity Comparator».

Детали детали

Номер произв 74AC521SC
Описание 8-Bit Identity Comparator
Производители Fairchild Semiconductor
логотип Fairchild Semiconductor логотип 

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74AC521SC Даташит, Описание, Даташиты
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November 1988
Revised March 2005
74AC521 74ACT521
8-Bit Identity Comparator
General Description
The AC/ACT521 is an expandable 8-bit comparator. It com-
pares 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
s ICC reduced by 50%
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 ACT521 has TTL-compatible inputs
Ordering Code:
Order Number Package Number
Package Description
74AC521SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74AC521SJ
M20D
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC521MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC521PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
74ACT521SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74ACT521SJ
M20D
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT521MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT521PC
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 table.
Pb-Free package per JEDEC J-STD-020B.
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.
© 2005 Fairchild Semiconductor Corporation DS009964
www.fairchildsemi.com









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74AC521SC Даташит, Описание, Даташиты
Truth Table
Inputs
IA B
A, B
L A 2 B (Note 1)
L A zÃ7
H A 2 B (Note 1)
H A zÃ7
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
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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74AC521SC Даташит, Описание, Даташиты
Absolute Maximum Ratings(Note 2)
Supply Voltage (VCC)
DC Input Diode Current (IIK)
VI 2 0.5V
VI 2 VCC  0.5V
DC Input Voltage (VI)
DC Output Diode Current (IOK)
VO 2 0.5V
VO 2 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
r50 mA
r50 mA
65qC to 150qC
140qC
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 (9V/9t)
0V to VCC
0V to VCC
40qC to 85qC
AC Devices
VIN from 30% to 70% of VCC
VCC @ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (9V/9t)
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, output/input loading variables. Fairchild does not rec-
ommend operation of FACT¥ circuits outside databook specifications.
DC Electrical Characteristics for AC
Symbol
Parameter
VIH Minimum HIGH Level
Input Voltage
VIL Maximum LOW Level
Input Voltage
VOH Minimum HIGH Level
Output Voltage
VCC
TA 25qC
TA 40qC to 85qC
(V) Typ
Guaranteed Limits
3.0 1.5
2.1
2.1
4.5 2.25 3.15
3.15
5.5 2.75 3.85
3.85
3.0 1.5
0.9
0.9
4.5 2.25 1.35
1.35
5.5 2.75 1.65
1.65
3.0 2.99
2.9
2.9
4.5 4.49
4.4
4.4
5.5 5.49
5.4
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
3.0
0.36
0.44
4.5
0.36
0.44
5.5
0.36
0.44
IIN
(Note 5)
Maximum Input
Leakage Current
5.5
r0.1 r1.0
IOLD
IOHD
ICC
(Note 5)
Minimum Dynamic
Output Current (Note 4)
Maximum Quiescent
Supply Current
5.5
5.5
5.5
75
75
4.0 40.0
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.
Units
Conditions
VOUT 0.1V
V or VCC  0.1V
VOUT 0.1V
V or VCC  0.1V
V IOUT 50 PA
VIN V IL or VIH
IOH = 12 mA
V IOH = 24 mA
IOH = 24 mA (Note 3)
V IOUT 50 PA
VIN V IL or VIH
IOL = 12 mA
V IOL = 24 mA
IOL = 24 mA (Note 3)
PA VI V CC, GND
mA VOLD 1.65V Max
mA VOHD 3.85V Min
PA VIN V CC
or GND
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