IDT54/74FCT240/244T/AT/CT/DT - 2240/2244T/AT/CT, IDT54/74FCT540/541/2541T/AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
IDT54/74FCT240T/AT/CT/DT - 2240T/AT/CT
FAST CMOS OCTAL
BUFFER/LINE
DRIVERS
IDT54/74FCT244T/AT/CT/DT - 2244T/AT/CT
IDT54/74FCT540T/AT/CT
IDT54/74FCT541/2541T/AT/CT
Integrated Device Technology, Inc.
FEATURES:
• Common features:
– Low input and output leakage
≤1µA
(max.)
– CMOS power levels
– True TTL input and output compatibility
– V
OH
= 3.3V (typ.)
– V
OL
= 0.3V (typ.)
– Meets or exceeds JEDEC standard 18 specifications
– Product available in Radiation Tolerant and Radiation
Enhanced versions
– Military product compliant to MIL-STD-883, Class B
and DESC listed (dual marked)
– Available in DIP, SOIC, SSOP, QSOP, CERPACK
and LCC packages
• Features for FCT240T/FCT244T/FCT540T/FCT541T:
– Std., A, C and D speed grades
– High drive outputs (-15mA I
OH
, 64mA I
OL
)
• Features for FCT2240T/FCT2244T/FCT2541T:
– Std., A and C speed grades
– Resistor outputs (-15mA I
OH
, 12mA I
OL
Com.)
(-12mA I
OH
, 12mA I
OL
Mil.)
– Reduced system switching noise
DESCRIPTION:
The IDT octal buffer/line drivers are built using an advanced
dual metal CMOS technology. The FCT240T/FCT2240T and
FCT244T/FCT2244T are designed to be employed as memory
and address drivers, clock drivers and bus-oriented transmit-
ter/receivers which provide improved board density.
The FCT540T and FCT541T/FCT2541T are similar in
function to the FCT240T/FCT2240T and FCT244T/FCT2244T,
respectively, except that the inputs and outputs are on oppo-
site sides of the package. This pinout arrangement makes
these devices especially useful as output ports for micropro-
cessors and as backplane drivers, allowing ease of layout and
greater board density.
The FCT2240T, FCT2244T and FCT2541T have balanced
output drive with current limiting resistors. This offers low
ground bounce, minimal undershoot and controlled output fall
times-reducing the need for external series terminating resis-
tors. FCT2xxxT parts are plug-in replacements for FCTxxxT
parts.
FUNCTIONAL BLOCK DIAGRAMS
OE
A
OE
B
DA
0
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
OE
A
OE
B
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
OE
B
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
OA
0
DB
0
OB
0
DA
1
OA
1
DB
1
OB
1
DA
2
OA
2
DB
2
OB
2
DA
3
OB
3
OA
3
DB
3
FCT240/2240T
FCT244/2244T
FCT540/541/2541T
*Logic diagram shown for 'FCT540.
'FCT541/2541T is the non-inverting option.
2565 drw 01
2565 drw 02
2565 drw 03
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996
Integrated Device Technology, Inc.
DECEMBER 1995
DSC-2565/6
6.8
6.8
1
1
IDT54/74FCT240/244T/AT/CT/DT - 2240/2244T/AT/CT, IDT54/74FCT540/541/2541T/AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATIONS
FCT240/2240T
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
1
2
3
4
5
6
7
8
9
10
P20-1
D20-1
SO20-2
SO20-7
SO20-8
&
E20-1
20
19
18
17
16
15
14
13
12
11
V
CC
OE
B
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
DA
1
OB
1
DA
2
OB
2
DA
3
4
5
6
7
8
L20-2
3 2
1
OE
A
V
CC
20 19
18
17
16
15
OE
B
DA
0
INDEX
OB
0
OA
0
DB
0
OA
1
DB
1
OA
2
14
9 10 11 12 13
GND
OB
3
DB
3
OA
3
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
2565 drw 04
LCC
TOP VIEW
2565 drw 07
FCT244/2244T
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
1
2
3
4
5
6
7
8
9
10
20
19
P20-1
D20-1
SO20-2
SO20-7
SO20-8
&
E20-1
18
17
16
15
14
13
12
11
V
CC
OE
B
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
3 2
DA
1
OB
1
DA
2
OB
2
DA
3
4
5
6
7
8
L20-2
1
20 19
18
17
16
15
14
9 10 11 12 13
OB
3
GND
DB
3
OA
3
DB
2
DA
0
INDEX
OE
B
*
OE
A
V
CC
OB
0
DB
2
OA
0
DB
0
OA
1
DB
1
OA
2
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
2565 drw 05
LCC
TOP VIEW
2565 drw 08
FCT540/541/2541T
OE
A
V
CC
D
1
D
0
OE
A
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
GND
1
2
3
4
5
6
7
8
9
10
P20-1
D20-1
SO20-2
SO20-8
&
E20-1
20
19
18
17
16
15
14
13
12
11
V
CC
OE
B
O
0
*
O
1
*
O
2
*
O
3
*
O
4
*
O
5
*
O
6
*
O
7
*
3 2
D
2
D
3
D
4
D
5
D
6
4
5
6
7
8
1
20 19
18
17
16
15
OE
B
INDEX
O
0
*
O
1
*
O
2
*
O
3
*
O
4
*
L20-2
14
9 10 11 12 13
D
7
GND
O
6
*
O
7
*
O
5
*
DIP/SOIC/QSOP/CERPACK
TOP VIEW
*
O
x for 540, Ox for 541/2541T
2565 drw 06
LCC
TOP VIEW
2565 drw 09
6.8
2
IDT54/74FCT240/244T/AT/CT/DT - 2240/2244T/AT/CT, IDT54/74FCT540/541/2541T/AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names
OE
A
,
OE
B
Dxx
Oxx
Description
3–State Output Enable Inputs (Active LOW)
Inputs
Outputs
2565 tbl 01
FUNCTION TABLE
Inputs
(1)
OE
A
L
L
H
OE
B
L
L
H
D
L
H
X
240
H
L
Z
Outputs
(1)
244
540
L
H
541
L
H
Z
L
Z
H
Z
2565 tbl 02
NOTES:
1. H = High Voltage Level
X = Don’t Care
L = Low Voltage Level
Z = High Impedance
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Rating
Commercial
(2)
Terminal Voltage
V
TERM
–0.5 to +7.0
with Respect to
GND
V
TERM(3)
Terminal Voltage
–0.5 to
with Respect to
V
CC
+0.5
GND
T
A
Operating
0 to +70
Temperature
T
BIAS
Temperature
–55 to +125
Under Bias
T
STG
Storage
–55 to +125
Temperature
P
T
Power Dissipation
0.5
I
OUT
DC Output
Current
–60 to +120
Military
–0.5 to +7.0
Unit
V
CAPACITANCE
(T
A
= +25°C, f = 1.0MHz)
Symbol
Parameter
(1)
C
IN
Input
Capacitance
C
OUT
Output
Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
6
8
Max. Unit
10
pF
12
pF
2565 lnk 04
–0.5 to
V
CC
+0.5
–55 to +125
–65 to +135
–65 to +150
0.5
–60 to +120
V
°
C
°
C
°
C
W
mA
NOTE:
1. This parameter is measured at characterization but not tested.
2565 lnk 03
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-
INGS 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 +0.5V unless otherwise noted.
2. Input and V
CC
terminals only.
3. Outputs and I/O terminals only.
6.8
3
IDT54/74FCT240/244T/AT/CT/DT - 2240/2244T/AT/CT, IDT54/74FCT540/541/2541T/AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
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
I H
I
I L
I
OZH
I
OZL
I
I
V
IK
V
H
I
CC
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
(4)
Input LOW Current
(4)
High Impedance Output Current
(3-State Output pins)
(4)
Input HIGH Current
(4)
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= Min., I
IN
= –18mA
—
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
CC
= Max.
V
I
= 2.7V
V
I
= 0.5V
V
O
= 2.7V
V
O
= 0.5V
V
CC
= Max., V
I
= V
CC
(Max.)
Min.
2.0
—
—
—
—
—
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
–0.7
200
0.01
Max.
—
0.8
±1
±1
±1
±1
±1
–1.2
—
1
Unit
V
V
µA
µA
µA
V
mV
mA
2565 lnk 05
V
CC
= Max., V
IN
= GND or V
CC
OUTPUT DRIVE CHARACTERISTICS FOR FCT240/244/540/541T
Symbol
V
OH
Parameter
Output HIGH Voltage
Test Conditions
(1)
V
CC
= Min.
I
OH
= –6mA MIL.
V
IN
= V
IH
or V
IL
I
OH
= –8mA COM'L.
I
OH
= –12mA MIL.
I
OH
= –15mA COM'L.
V
CC
= Min.
I
OL
= 48mA MIL.
V
IN
= V
IH
or V
IL
I
OL
= 64mA COM'L.
(3)
V
CC
= Max., V
O
= GND
Min.
2.4
2.0
—
–60
Typ.
(2)
3.3
3.0
0.3
–120
Max.
—
—
0.55
–225
Unit
V
V
V
mA
2565 lnk 06
V
OL
I
OS
Output LOW Voltage
Short Circuit Current
OUTPUT DRIVE CHARACTERISTICS FOR FCT2240/2244/2541T
Symbol
I
ODL
I
ODH
V
OH
V
OL
Parameter
Output LOW Current
Output HIGH Current
Output HIGH Voltage
Output LOW Voltage
Test Conditions
(1)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –12mA MIL.
I
OH
= –15mA COM'L.
I
OL
= 12mA
Min.
16
–16
2.4
—
Typ.
(2)
48
–48
3.3
0.3
Max.
—
—
—
0.50
Unit
mA
mA
V
V
2565 lnk 07
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.
3. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.
4. The test limit for this parameter is
±5µA
at T
A
= –55°C.
6.8
4
IDT54/74FCT240/244T/AT/CT/DT - 2240/2244T/AT/CT, IDT54/74FCT540/541/2541T/AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply
Current
(4)
Test Conditions
(1)
V
CC
= Max.
V
IN
= 3.4V
(3)
V
CC
= Max.
Outputs Open
Min.
—
—
Typ.
(2)
0.5
0.15
Max.
2.0
0.25
Unit
mA
mA/
MHz
V
IN
= V
CC
FCTxxxT
V
IN
= GND
FCT2xxxT
V
IN
= V
CC
FCTxxxT
OE
A
=
OE
B
= GND
One Input Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fi = 10MHz
50% Duty Cycle
—
—
—
—
0.06
1.5
0.6
1.8
0.9
—
—
—
—
3.0
1.2
5.0
3.2
0.12
3.5
2.2
4.5
3.2
6.0
(5)
3.4
(5)
14.0
(5)
11.4
(
5)
2565 tbl 08
I
C
Total Power Supply Current
(6)
mA
V
IN
= GND FCT2xxxT
V
IN
= 3.4
FCTxxxT
OE
A
=
OE
B
= GND
One Bit Toggling
V
CC
= Max.
Outputs Open
fi = 2.5MHz
50% Duty Cycle
V
IN
= GND FCT2xxxT
V
IN
= V
CC
FCTxxxT
V
IN
= GND FCT2xxxT
V
IN
= 3.4
FCTxxxT
OE
A
=
OE
B
= GND
Eight Bits Toggling
V
IN
= GND FCT2xxxT
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 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.
6.8
5
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