IDT54/74FCT521/A/B/C
FAST CMOS 8-BIT IDENTITY COMPARATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FAST CMOS
8-BIT IDENTITY
COMPARATOR
IDT54/74FCT521/A/B/C
FEATURES:
−
−
−
−
−
−
−
−
−
−
−
−
−
IDT54/74FCT521 equivalent to FAST
TM
speed
IDT54/74FCT521A 35% faster than FAST
IDT54/74FCT521B 50% faster than FAST
IDT54/74FCT521C 60% faster than FAST
Equivalent to FAST output drive over full temperature and voltage
supply extremes
I
OL
= 48mA (commercial), and 32mA (military)
CMOS power levels (1mW typ. static)
TTL input and output level compatible
CMOS output level compatible
Substantially lower input current levels than FAST (5µ A max.)
JEDEC standard pinout for DIP and LCC
Military product compliant to MIL-STD-883, Class B
Available in the following packages:
•
Commercial: SOIC
•
Military: CERDIP, LCC, CERPACK
DESCRIPTION:
The FCT521 is an 8-bit identity comparator built using an advanced dual
metal CMOS technology. These devices compare two words of up to eight
bits each and provide a low output when the two words match bit for bit. The
expansion input
I
A = B
also serves as an active low enable input.
FUNCTIONAL BLOCK DIAGRAM
A
0
B
0
A
1
B
1
A
2
B
2
A
3
B
3
A
4
B
4
A
5
B
5
A
6
B
6
A
7
B
7
2
3
4
5
6
7
8
9
19
11
12
O
A=B
13
14
15
16
17
18
1
I
A=B
MILITARY AND COMMERCIAL TEMPERATURE RANGES
1
c
1999 Integrated Device Technology, Inc.
JUNE 2000
DSC-4617/2
IDT54/74FCT521/A/B/C
FAST CMOS 8-BIT IDENTITY COMPARATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATION
I
A=B
A
0
B
0
A
1
B
1
A
2
B
2
A
3
B
3
GND
1
2
3
4
5
6
7
8
9
10
D20-1
SO20-2
E20-1
B
0
19
18
17
16
15
14
13
12
11
O
A=B
B
7
A
7
B
6
A
6
B
5
A
5
B
4
A
1
B
1
A
2
B
2
A
3
4
5
6
7
8
9
10
11
12
13
L20-2
3
2
1
20
19
18
17
16
15
14
A
0
20
V
CC
IND EX
V
CC
I
A =B
O
A=B
B
7
A
7
B
6
A
6
B
5
B
3
A
4
B
4
A
4
CERDIP/ SOIC/ CERPACK
TOP VIEW
LCC
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
T
A
T
BIAS
T
STG
P
T
I
OUT
Rating
Terminal Voltage
with Respect to GND
Terminal Voltage
with Respect to GND
Operating Temperature
Temperature Under
Bias
Storage Temperature
Power Dissipation
DC Output Current
Commercial
–0.5 to +7
–0.5 to V
CC
0 to +70
–55 to +125
–55 to +125
0.5
120
Military
–0.5 to +7
–0.5 to V
CC
–55 to +125
–65 to +135
–65 to +150
0.5
120
Unit
V
V
°C
°C
°C
W
mA
8-link
PIN DESCRIPTION
Pin Names
A
0
- A
7
B
0
- B
7
I
A
=
B
O
A
=
B
Description
Word A Inputs
Word B Inputs
Expansion or Enable Input (Active LOW)
Identity Output (Active LOW)
FUNCTION TABLE
INPUTS
I
A
=
B
L
L
H
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
*A0 = B0, A1 = B1, A2 = B2, etc.
GND
(1)
OUTPUT
O
A = B
L
H
H
H
A, B
A = B*
A
≠
B
A = B*
A
≠
B
NOTES:
1. Stresses greater than those listed under ABSOLUTE 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. No
terminal voltage may exceed V
CC
by +.5V unless otherwise noted.
2. Input and V
CC
terminals only.
3. Outputs and I/O terminals only.
CAPACITANCE
(T
A
= +25
O
C, f = 1.0MHz)
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output
Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
6
8
Max.
10
12
Unit
pF
pF
8-link
NOTE:
1. This parameter is measured at characterization but not tested.
2
A
5
IDT54/74FCT521/A/B/C
FAST CMOS 8-BIT IDENTITY COMPARATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: V
LC
= 0.2V; V
HC
= V
CC
– 0.2V
Commercial: T
A
= 0°C to +70°C, V
CC
= 5.0V ± 5%; Military: T
A
= –55°C to +125°C, V
CC
= 5.0V ± 10%
Symbol
V
IH
V
IL
I
IH
I
IL
V
IK
I
OS
V
OH
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
Input LOW Current
Clamp Diode Voltage
Short Circuit Current
Output HIGH Voltage
V
CC
= Min., I
N
= –18mA
V
CC
= Max.
(3)
, V
O
= GND
V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OH
= –32µ A
V
CC
= Min.
V
IN
= V
IH
or V
IL
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
I
= V
CC
V
I
= 2.7V
V
I
= 0.5V
V
I
= GND
Min.
2
—
—
—
—
—
—
–60
V
HC
V
HC
2.4
2.4
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
–0.7
–120
V
CC
V
CC
4.3
4.3
GND
GND
0.3
0.3
Max.
—
0.8
5
5
(4)
–5
(4)
–5
–1.2
—
—
—
—
—
V
LC
V
LC(4)
0.5
0.5
Unit
V
V
µA
V
mA
V
I
OH
= –300µ A
I
OH
= –12mA MIL.
I
OH
= –15mA COM'L.
V
OL
Output LOW Voltage
V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OL
= 300µ A
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OL
= 300µ A
I
OL
= 32mA MIL.
I
OL
= 48mA COM'L.
V
NOTES:
1. For conditions shown as Max. or Min., 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 short circuit test should not exceed one second.
4. This parameter is guaranteed but not tested.
3
IDT54/74FCT521/A/B/C
FAST CMOS 8-BIT IDENTITY COMPARATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
V
LC
= 0.2V; V
HC
= V
CC
- 0.2V
Symbol
I
CC
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Quiescent Power Supply Current TTL
Inputs HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max.
V
IN
≥
V
HC
; V
IN
≤
V
LC
V
CC
= Max.
V
IN
= 3.4V
(3)
V
CC
= Max.
Outputs Open
One Input Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fi = 10MHz
One Bit Toggling
50% Duty Cycle
Min.
—
—
V
IN
≥
V
HC
V
IN
≤
V
LC
—
Typ.
(2)
0.2
0.5
0.15
Max.
1.5
2
0.25
Unit
mA
mA
mA/
MHz
I
C
Total Power Supply Current
(5)
V
IN
≥
V
HC
V
IN
≤
V
LC
(FCT)
V
IN
= 3.4V
V
IN
= GND
—
—
1.7
2
4
5
mA
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at V
CC
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 I
CC
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 Output 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 - COMMERCIAL
IDT74FCT521
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
Parameter
Propagation Delay
An or Bn to
O
A
=
B
Propagation Delay
I
A
=
B
to
O
A
=
B
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
Min
.(2)
1.5
1.5
Max
.
11
10
IDT74FCT521A
Min
.(2)
1.5
1.5
Max
.
7.2
6
IDT74FCT521B
Min
.(2)
1.5
1.5
Max
.
5.5
4.6
IDT74FCT521C
Min
.(2)
1.5
1.5
Max
.
4.5
4.1
Unit
ns
ns
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - MILITARY
IDT54FCT521
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
Parameter
Propagation Delay
An or Bn to
O
A
=
B
Propagation Delay
I
A
=
B
to
O
A
=
B
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
Min
.(2)
1.5
1.5
Max
.
15
9
IDT54FCT521A
Min
.(2)
1.5
1.5
Max
.
9.5
7.8
IDT54FCT521B
Min
.(2)
1.5
1.5
Max
.
7.3
6
IDT54FCT521C
Min
.(2)
1.5
1.5
Max
.
5.1
4.5
Unit
ns
ns
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
4
IDT54/74FCT521/A/B/C
FAST CMOS 8-BIT IDENTITY COMPARATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
V
CC
500
Ω
V
IN
Pulse
Generator
D.U.T.
50pF
R
T
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
All Other Tests
Open
8-link
7.0V
Switch
Closed
V
OUT
500
Ω
C
L
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
O ctal lin k
SET-UP, HOLD, AND RELEASE TIMES
DATA
INPUT
t
SU
TIM ING
INPUT
ASYNCHRONOUS C ONTROL
PRES ET
CLEAR
ETC.
SYNCHRO NOUS CONTRO L
PRES ET
CLEAR
CLOCK ENABLE
ETC.
t
REM
t
H
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
O ctal lin k
PULSE WIDTH
LO W -HIGH-LOW
PULSE
t
W
HIGH-LOW -HIGH
PULSE
O ctal lin k
1.5V
1.5V
t
SU
t
H
PROPAGATION DELAY
SAM E PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
OPPOSITE P HASE
INPUT TRANSITION
t
PH L
t
PH L
3V
1.5V
0V
V
OH
1.5V
V
OL
3V
1.5V
0V
O ctal lin k
ENABLE AND DISABLE TIMES
ENAB LE
DISA BLE
3V
CO NTROL
INPUT
t
PZL
OUTPUT
NO RM A LLY
LO W
SW ITCH
CLOSE D
t
PZH
OUTPUT
NO RM A LLY
HIGH
SW ITCH
OPEN
3.5V
1.5V
0.3V
t
PHZ
0.3V
1.5V
0V
0V
O ctal lin k
1.5V
t
PLZ
0V
3.5V
V
OL
V
OH
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control
Disable-HIGH.
2. Pulse Generator for All Pulses: Rate
≤
1.0MHz; Zo
≤
50Ω; t
F
≤
2.5ns;
t
R
≤
2.5ns.
5
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