21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT521T
8-Bit Identity Comparator
PI74FCT521T
Product Features
Fast CMOS
8-Bit Identity Comparator
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 209 mil wide plastic SSOP (H)
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 Semiconductors PI74FCT series of logic circuits are pro-
duced in the Companys 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 I
A
=
B
also serves as an active LOW enable input.
Logic Block Diagram
A
0
B
0
A
1
B
1
A
2
B
2
A
3
B
3
O
A=B
A
4
B
4
A
5
B
5
A
6
B
6
A
7
B
7
I
A=B
1
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PI74FCT521T
8-Bit Identity Comparator
Product Pin Description
Pin Name
I
A=B
O
A=B
A
0
A
7
B
0
B
7
GND
V
CC
Description
Expansion or Enable Input (Active LOW)
Identity Output (Active LOW)
Word A Inputs
Word B Inputs
Ground
Power
Truth Table
(1)
Inputs
I
A=B
L
L
H
H
A, B
A = B*
A
≠
B
A = B*
A
≠
B
Output
O
A=B
L
H
H
H
Product Pin Configuration
I
A=B
A
0
B
0
A
1
B
1
A
2
B
2
A
3
B
3
GND
1
20
2
19
3
20-Pin
18
4
L,P,Q,
17
5
R,S,H
16
6
15
7
14
8
13
9
12
10
11
NOTE: 1. H = High Voltage Level
L = Low Voltage Level,
*A
0
= B
0
, A
1
= B
1
, A
2
= B
2
, etc.
Vcc
O
A=B
B
7
A
7
B
6
A
6
B
5
A
5
B
4
A
4
2
PS2019B
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PI74FCT521T
8-Bit Identity Comparator
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, T
A
= 40°C to +85°C, V
CC
= 5V ± 5%)
Parameters Description
V
OH
V
OL
V
IH
V
IL
I
IH
I
IL
V
IK
I
OS
I
OFF
V
H
Output HIGH Voltage
Output LOW Current
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Clamp Diode Voltage
Short Circuit Current
Power Down Disable
Input Hysteresis
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
CC
= Max.
V
CC
= Min., I
IN
= 18 mA
V
CC
= Max.
(3)
, V
OUT
= GND
V
CC
= GND, V
OUT
= 4.5V
60
V
IN
= V
CC
V
IN
= GND
0.7
120
200
100
I
OH
= 15.0 mA
I
OL
= 48 mA
2.0
0.8
1
1
1.2
Min.
2.4
Typ
(2)
3.0
0.3
0.50
Max.
Units
V
V
V
V
µA
µA
V
mA
µA
m
V
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(4)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ
6
8
Max.
10
12
Units
pF
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.
3
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PI74FCT521T
8-Bit Identity Comparator
Power Supply Characteristics
Parameters Description
I
CC
∆I
CC
I
CCD
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
One Input Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
One Bit Toggling
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
Typ
(2)
0.1
0.5
0.15
Max.
500
2.0
0.25
Units
µA
mA
mA/
MHz
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
1.5
1.8
3.5
(5)
4.5
(5)
mA
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 (V
IN
= 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. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
∆I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
Switching Characteristics over Operating Range
521T
Com.
521AT
Com.
Max
Min
Max
521BT
Com.
Min
Max
521CT
Com.
Min
Max
521DT
Com.
Min
Max
Unit
Parameters
t
PLH
t
PHL
t
PLH
t
PHL
Description
Propagation Delay
A
N
or B
N
to O
A
=
B
Propagation Delay
I
A
=
B
to O
A
=
B
Conditions
(1)
C
L
= 50 pF
R
L
= 500Ω
Min
1.5
1.5
10.0
9.0
1.5
1.5
7.2
6.0
1.5
1.5
5.5
4.6
1.5
1.5
4.5
4.1
1.5
1.5
4.2
3.8
ns
ns
Notes:
1. See Test Circuit and Waveforms
2. Minimum limits are guaranteed but not tested on Propagation Delays.
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PI74FCT521T
8-Bit Identity Comparator
20-pin 173 mil wide plastic TSSOP (L) Package
20
.169
.177
4.3
4.5
1
.252
.260
6.4
6.6
.004 0.09
.008 0.20
.047
1.20
Max
0.45
0.75
.018
.030
SEATING
PLANE
.238
.269
6.1
6.7
.0256
BSC
0.65
.007
.012
0.19
0.30
.002 0.05
.006 0.15
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
20-pin 300 mil wide plastic DIP (P)
20
.240
.280
1
.980
1.060
24.9
26.9
.210
Max.
5.33
SEATING PLANE
6.09
7.11
7.62
8.25
.300
.325
.008
.014
0.20
0.35
0˚
15˚
.310
.380
7.87
9.65
0.015 Min.
0.381
.115
.150
2.921
3.81
.100
typical
2.54
.014 0.42
.022 0.51
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
5
PS2019B
07/02/02
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