NSC 5962R9098501S2A, 5962R9098501BSA, 5962R9098501BRA, 5962R9098501B2A, 5962R9098501SSA Datasheet
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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
nICC reduced by 50%
nCompares two 8-bit words in 6.5 ns typ
nExpandable to any word length
nOutputs source/sink 24 mA
nACT521 has TTL-compatible inputs
nStandard 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
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DS100291-3 |
Pin Descriptions |
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Pin Names |
Description |
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A0±A7 |
Word A Inputs |
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B0±B7 |
Word B Inputs |
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TA = B |
Expansion or Enable Input |
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A = B |
Identity Output |
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O |
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FACT™ is a trademark of Fairchild Semiconductor Corporation.
Comparator Identity Bit-8 54ACT521 · 54AC521
© 1998 National Semiconductor Corporation |
DS100291 |
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Truth Table
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Inputs |
Outputs |
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IA = B |
A, B |
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A = B |
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O |
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L |
A = B (Note 1) |
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L |
L |
A ¹ B |
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H |
H |
A = B (Note 1) |
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H |
H |
A ¹ B |
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H |
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H = HIGH Voltage Level
L = LOW Voltage Level
Note 1: A0 = B0, A1 = B1, A2 = B2, etc.
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.
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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) |
−0.5V to +7.0V |
DC Input Diode Current (IIK) |
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VI = −0.5V |
−20 mA |
VI = VCC + 0.5V |
+20 mA |
DC Input Voltage (VI) |
−0.5V to V CC + 0.5V |
DC Output Diode Current (IOK) |
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VO = −0.5V |
−20 mA |
VO = VCC + 0.5V |
+20 mA |
DC Output Voltage (VO) |
−0.5V to V CC + 0.5V |
DC Output Source |
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or Sink Current (IO) |
±50 mA |
DC VCC or Ground Current |
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per Output Pin (ICC or IGND) |
±50 mA |
Storage Temperature (TSTG) |
−65ÊC to +150ÊC |
Junction Temperature (TJ) |
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CDIP |
175ÊC |
Recommended Operating
Conditions
Supply Voltage (VCC) |
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AC |
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2.0V to 6.0V |
ACT |
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4.5V to 5.5V |
Input Voltage (VI) |
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0V to VCC |
Output Voltage (VO) |
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0V to VCC |
Operating Temperature (TA) |
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54AC/ACT |
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−55ÊC to +125ÊC |
Minimum Input Edge Rate ( |
V/ |
t) |
AC Devices |
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VIN from 30% to 70% of VCC |
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VCC @ 3.3V, 4.5V, 5.5V |
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125 mV/ns |
Minimum Input Edge Rate ( |
V/ |
t) |
ACT Devices |
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VIN from 0.8V to 2.0V |
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VCC @ 4.5V, 5.5V |
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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 |
Parameter |
VCC |
TA = −55ÊC to +125ÊC |
Units |
Conditions |
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(V) |
Guaranteed Limits |
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VIH |
Minimum High Level |
3.0 |
2.1 |
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VOUT = 0.1V |
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Input Voltage |
4.5 |
3.15 |
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or VCC − 0.1V |
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5.5 |
3.85 |
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VIL |
Maximum Low Level |
3.0 |
0.9 |
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VOUT = 0.1V |
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Input Voltage |
4.5 |
1.35 |
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or VCC − 0.1V |
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5.5 |
1.65 |
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VOH |
Minimum High Level |
3.0 |
2.9 |
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IOUT = −50 µA |
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Output Voltage |
4.5 |
4.4 |
V |
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5.5 |
5.4 |
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VIN = V IL or VIH |
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3.0 |
2.4 |
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IOH = −4 mA |
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4.5 |
3.7 |
V |
IOH = −24 mA |
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5.5 |
4.7 |
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IOH = −24 mA (Note 3) |
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VOL |
Maximum Low Level |
3.0 |
0.1 |
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IOUT = 50 µA |
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Output Voltage |
4.5 |
0.1 |
V |
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5.5 |
0.1 |
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VIN = V IL or VIH |
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3.0 |
0.4 |
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IOL = 12 mA |
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4.5 |
0.5 |
V |
IOL = 24 mA |
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5.5 |
0.5 |
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IOL = 24 mA (Note 3) |
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IIN |
Maximum Input |
5.5 |
±1.0 |
µA |
VI = V CC, GND |
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(Note 5) |
Leakage Current |
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IOLD |
Minimum Dynamic |
5.5 |
50 |
mA |
VOLD = 1.65V Max |
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Output Current (Note 4) |
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IOHD |
5.5 |
−50 |
mA |
V OHD = 3.85V Min |
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ICC |
Maximum Quiescent |
5.5 |
80.0 |
µA |
VIN = V CC |
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(Note 5) |
Supply Current |
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or GND |
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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 |
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