74F521 PDF даташит
Спецификация 74F521 изготовлена «Fairchild» и имеет функцию, называемую «8-Bit Identity Comparator». |
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Детали детали
Номер произв | 74F521 |
Описание | 8-Bit Identity Comparator |
Производители | Fairchild |
логотип |
7 Pages
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April 1988
Revised August 1999
74F521
8-Bit Identity Comparator
General Description
The 74F521 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 Compares two 8-bit words in 6.5 ns typ
s Expandable to any word length
s 20-pin package
Ordering Code:
Order Number Package Number
Package Description
74F521SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F521SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F521MSA
MSA20
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74F521PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
© 1999 Fairchild Semiconductor Corporation DS009545
www.fairchildsemi.com
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Unit Loading/Fan Out
Pin Names
Description
A0–A7
B0–B7
IA=B
OA=B
Word A Inputs
Word B Inputs
Expansion or Enable Input (Active LOW)
Identity Output (Active LOW)
U.L.
Input IIH/IIL
HIGH/LOW Output IOH/IOL
1.0/1.0 20 µA/−0.6 mA
1.0/1.0 20 µA/−0.6 mA
1.0/1.0 20 µA/−0.6 mA
50/33.3 −1 mA/20 mA
Truth Table
IA = B
L
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
Note 1: A0 = B0, A1 = B1, A2 = B2, etc.
H
Logic Diagram
Inputs
A, B
A = B (Note 1)
A≠B
A = B (Note 1)
A≠B
Output
OA = B
L
H
H
H
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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Absolute Maximum Ratings(Note 2)
Storage Temperature
−65°C to +150°C
Ambient Temperature under Bias
−55°C to +125°C
Junction Temperature under Bias
−55°C to +150°C
VCC Pin Potential to Ground Pin
Input Voltage (Note 3)
−0.5V to +7.0V
−0.5V to +7.0V
Input Current (Note 3)
−30 mA to +5.0 mA
Voltage Applied to Output
in HIGH State (with VCC = 0V)
Standard Output
3-STATE Output
−0.5V to VCC
−0.5V to +5.5V
Current Applied to Output
in LOW State (Max)
twice the rated IOL (mA)
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to +70°C
+4.5V to +5.5V
Note 2: Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 3: Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Symbol
Parameter
VIH
VIL
VCD
VOH
VOL
IIH
IBVI
ICEX
VID
IOD
IIL
IOS
ICCH
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
Output LOW
Voltage
10% VCC
5% VCC
10% VCC
Input HIGH Current
Input HIGH Current
Breakdown Test
Output HIGH
Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW Current
Output Short-Circuit Current
Power Supply Current
Min Typ
2.0
2.5
2.7
Max
0.8
−1.2
0.5
5.0
7.0
50
4.75
3.75
−0.6
−60 −150
21 32
Units
V
V
V
V
V
µA
µA
µA
V
µA
mA
mA
mA
VCC Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
Min IIN = −18 mA
Min IOH = −1 mA
IOH = −1 mA
Min IOL = 20 mA
Max VIN = 2.7V
Max VIN = 7.0V
Max VOUT = VCC
0.0 IID = 1.9 µA
All Other Pins Grounded
0.0 VIOD = 150 mV
All Other Pins Grounded
Max VIN = 0.5V
Max VOUT = 0V
Max VO = HIGH
3 www.fairchildsemi.com
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