PERICOM PI74FCT521

PI74FCT521T
8-BIT
IDENTITY
COMPARATOR
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PI74FCT521T
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Fast CMOS
8-Bit Identity Comparator
Product Features:
• PI74FCT521T is pin compatible with bipolar FAST™ Series at
a higher speed and lower power consumption
• TTL input and output levels
• Extremely low static power
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packages available:
– 20-pin 173 mil wide plastic TSSOP (L)
– 20-pin 300 mil wide plastic DIP (P)
– 20-pin 150 mil wide plastic QSOP (Q)
– 20-pin 150 mil wide plastic TQSOP (R)
– 20-pin 300 mil wide plastic SOIC (S)
Product Description:
Pericom Semiconductor’s PI74FCT series of logic circuits are produced in the Company’s advanced 0.8 micron CMOS technology,
achieving industry leading speed grades.
The PI74FCT521T is an 8-bit identity comparator. When two
words of up to eight bits are compared, a bit-for-bit match of the two
words provides a LOW output. The comparison can be extended
over multiple words by the expansion input. The expansion input
IA=B also serves as an active LOW enable input.
Logic Block Diagram
A0
B0
A1
B1
A2
B2
A3
B3
OA=B
A4
B4
A5
B5
A6
B6
A7
B7
I A=B
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PS2019A 03/11/96
PI74FCT521T
8-BIT
IDENTITY
COMPARATOR
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Truth Table(1)
Product Pin Description
Pin Name
IA=B
OA=B
A0–A7
B0–B7
GND
VCC
Inputs
Description
Expansion or Enable Input (Active LOW)
Identity Output (Active LOW)
Word A Inputs
Word B Inputs
Ground
Power
IA=B
L
L
H
H
1
20
2
19
3 20-PIN 18
L20 17
4
P20 16
5
Q20
6
15
R20
7
14
S20
8
13
9
12
10
11
Output
OA=B
L
H
H
H
NOTE: 1. H = High Voltage Level
L = Low Voltage Level,
*A0 = B0, A1 = B1, A2 = B2, etc.
Product Pin Configuration
IA=B
A0
B0
A1
B1
A2
B2
A3
B3
GND
A, B
A = B*
A≠B
A = B*
A≠B
Vcc
OA=B
B7
A7
B6
A6
B5
A5
B4
A4
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PS2019A 03/11/96
PI74FCT521T
8-BIT
IDENTITY
COMPARATOR
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Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature .................................................................... –65°C to +150°C
Ambient Temperature with Power Applied .....................................-40°C to +85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) .............. –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ........... –0.5V to +7.0V
DC Input Voltage ............................................................................ –0.5V to +7.0V
DC Output Current ..................................................................................... 120 mA
Power Dissipation ..........................................................................................0.5W
Note:
Stresses greater than those listed under
MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating
only and functional operation of the device at
these or any other conditions above those
indicated in the operational sections of this
specification is not implied. Exposure to
absolute maximum rating conditions for
extended periods may affect reliability.
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5V ± 5%)
Test Conditions(1)
Parameters Description
Min.
Typ(2)
2.4
3.0
VOH
Output HIGH Voltage
VCC = Min., VIN = VIH or VIL
IOH = –15.0 mA
VOL
Output LOW Current
VCC = Min., VIN = VIH or VIL
IOL = 48 mA
VIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
VIL
Input LOW Voltage
Guaranteed Logic LOW Level
IIH
Input HIGH Current
VCC = Max.
IIL
Input LOW Current
VCC = Max.
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18 mA
IOS
Short Circuit Current
VCC = Max.(3), VOUT = GND
–60
–120
IOFF
Power Down Disable
VCC = GND, VOUT = 4.5V
—
—
VH
Input Hysteresis
0.3
Max.
Units
V
0.50
2.0
V
V
0.8
V
VIN = VCC
1
µA
VIN = GND
–1
µA
–1.2
V
–0.7
mA
100
200
µA
mV
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(4)
Description
Test Conditions
Typ
Max.
Units
CIN
Input Capacitance
VIN = 0V
6
10
pF
COUT
Output Capacitance
VOUT = 0V
8
12
pF
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is determined by device characterization but is not production tested.
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PS2019A 03/11/96
PI74FCT521T
8-BIT
IDENTITY
COMPARATOR
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Power Supply Characteristics
Test Conditions(1)
Parameters Description
Min.
Typ(2)
Max.
Units
ICC
Quiescent Power
Supply Current
VCC = Max.
VIN = GND or VCC
0.1
500
µA
∆ICC
Supply Current per
Input @ TTL HIGH
VCC = Max.
VIN = 3.4V(3)
0.5
2.0
mA
ICCD
Supply Current per
Input per MHz(4)
VCC = Max.,
Outputs Open
One Input Toggling
50% Duty Cycle
VIN = VCC
VIN = GND
0.15
0.25
mA/
MHz
IC
Total Power Supply
Current(6)
VCC = Max.,
Outputs Open
fI = 10 MHZ
50% Duty Cycle
One Bit Toggling
VIN = VCC
VIN = GND
VIN = 3.4V
VIN = GND
1.5
3.5(5)
mA
1.8
4.5(5)
Notes:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 3.4V); all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. IC =IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fINI)
ICC = Quiescent Current
∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fI = Input Frequency
NI = Number of Inputs at fI
All currents are in milliamps and all frequencies are in megahertz.
Switching Characteristics over Operating Range
521T
521AT
Com.
Parameters
tPLH
tPHL
tPLH
tPHL
521BT
Com.
521CT
Com.
Com.
521DT
Com.
Description
Conditions(1)
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Unit
Propagation Delay
AN or BN to OA=B
Propagation Delay
IA=B to OA=B
CL = 50 pF
RL = 500Ω
1.5
10.0
1.5
7.2
1.5
5.5
1.5
4.5
1.5
4.2
ns
1.5
9.0
1.5
6.0
1.5
4.6
1.5
4.1
1.5
3.8
ns
Notes:
1. See Test Circuit and Waveforms
2. Minimum limits are guaranteed but not tested on Propagation Delays.
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
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PS2019A 03/11/96