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
FAST CMOS OCTAL
IDT54/74FCT240T/AT/CT/DT - 2240T/AT/CT
IDT54/74FCT244T/AT/CT/DT - 2244T/AT/CT
BUFFER/LINE
DRIVERS
Integrated Device Technology, Inc.
IDT54/74FCT540T/AT/CT
IDT54/74FCT541/2541T/AT/CT
FEATURES:
• Common features:
– Low input and output leakage ≤1µA (max.)
– CMOS power levels
– True TTL input and output compatibility
– VOH = 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 IOH, 64mA IOL)
• Features for FCT2240T/FCT2244T/FCT2541T:
– Std., A and C speed grades
– Resistor outputs (-15mA IOH, 12mA IOL Com.)
(-12mA IOH, 12mA IOL 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 transmitter/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 opposite sides of the package. This pinout arrangement makes
these devices especially useful as output ports for microprocessors 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 resistors. FCT2xxxT parts are plug-in replacements for FCTxxxT
parts.
FUNCTIONAL BLOCK DIAGRAMS
OE
A
OE
B
DA0
OB
DA1
OB
DA2
OB
DA3
OB3
0
1
2
FCT240/2240T
OA
0
DB0
OA
1
DB1
OA
2
DB2
OA
3
DB3
2565 drw 01
OE
DA0
OB0
DA1
OB1
DA2
OB2
DA3
OB3
OE
OE
A
OE
B
OA0
DB0
OA1
DB1
OA2
DB2
OA3
DB3
FCT244/2244T
2565 drw 02
A
D0 O0
D1
D2
D3
D4
D5
D6
D7
FCT540/541/2541T
*Logic diagram shown for 'FCT540.
'FCT541/2541T is the non-inverting option.
2565 drw 03
B
O1
O2
O3
O4
O5
O6
O7
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES DECEMBER 1995
1996 Integrated Device Technology, Inc. 6.8 DSC-2565/6
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
FCT244/2244T
OEA
DA0
OB0
DA1
OB1
DA2
OB2
DA3
OB3
GND
20
2
3
4
5
6
7
8
9
P20-1
D20-1
SO20-2
SO20-7
SO20-8
E20-1
19
18
17
16
15
14
13
&
12
10 11
VCC1
OEB
OA0
DB
OA1
DB1
OA2
DB2
OA3
DB3
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
OE
DA
OB
DA
OB
DA
OB
DA
OB
GND
1
A
2
0
3
0
1
1
2
2
3
3
4
5
6
7
8
9
P20-1
D20-1
SO20-2
SO20-7
SO20-8
E20-1
10
20
19
18
17
16
15
14
&
13
12
11
V
OE
OA
DB
OA
DB
OA
DB
OA
DB
CC
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
0
B
0
0
1
1
2
2
3
3
2565 drw 04
2565 drw 05
INDEX
INDEX
DA
OB
DA
OB
DA
DA1
OB1
DA2
OB2
DA3
1
1
2
2
3
OB0
DA0
OEA
3 2 20 19
4
1
5
6
L20-2
7
8
9 10111213
3
OB3
DB
GND
LCC
TOP VIEW
0
OB
0
DA
A
OE
CC
V
3 2 20 19
4
1
5
6
L20-2
7
8
11
910 1213
3
3
OB
DB
GND
LCC
TOP VIEW
VCC
OA3
3
OA
18
17
16
15
14
DB2
*
B
OE
18
17
16
15
14
2
DB
OEB
OA0
DB0
OA1
DB1
OA2
2565 drw 07
OA
0
DB
0
OA
1
DB
1
OA
2
2565 drw 08
FCT540/541/2541T
OEA
D0
D1
D2
D3
D4
D5
D6
D7
GND
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
DIP/SOIC/QSOP/CERPACK
TOP VIEW
*Ox for 540, Ox for 541/2541T
V
CC1
OEB
0*
O
1*
O
2*
O
3*
O
4*
O
O
5*
6*
O
O
7*
INDEX
D2
D3
D4
D5
D6
D1
OEA
D0
3 2 20 19
4
1
5
6
L20-2
7
8
9 10111213
7*O6*O5*
D7
O
GND
VCC
OEB
18
17
16
15
14
O0*
O
O
O
O
1*
2*
3*
4*
LCC
TOP VIEW
2565 drw 06 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 FUNCTION TABLE
Pin Names Description
OE
A, OEB 3–State Output Enable Inputs (Active LOW)
Dxx Inputs
Oxx Outputs
2565 tbl 01
(1)
OE
OE
A
Inputs
OE
B D 240 244 540 541
OE
Outputs
LLLHLHL
LLHLHLH
H H X ZZZZ
NOTES:
1. H = High Voltage Level
X = Don’t Care
L = Low Voltage Level
Z = High Impedance
(1)
2565 tbl 02
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol Rating Commercial Military Unit
(2)
VTERM
Terminal Voltage
–0.5 to +7.0 –0.5 to +7.0 V
with Respect to
GND
(3)
VTERM
TA Operating
Terminal Voltage
with Respect to
GND
–0.5 to
V
CC +0.5
–0.5 to
VCC +0.5
0 to +70 –55 to +125 °C
V
Temperature
TBIAS Temperature
–55 to +125 –65 to +135 °C
Under Bias
TSTG Storage
–55 to +125 –65 to +150 °C
Temperature
PT Power Dissipation 0.5 0.5 W
IOUT DC Output
–60 to +120 –60 to +120 mA
Current
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
CC by +0.5V unless otherwise noted.
V
2. Input and V
3. Outputs and I/O terminals only.
CC terminals only.
2565 lnk 03
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Symbol Parameter
CIN Input
Capacitance
COUT Output
Capacitance
NOTE:
1. This parameter is measured at characterization but not tested.
(1)
Conditions Typ. Max. Unit
VIN = 0V 6 10 pF
VOUT = 0V 8 12 pF
2565 lnk 04
6.8 3
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