Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
MAY 1992
1992 Integrated Device Technology, Inc.
7.8
DSC-4610/3
FAST CMOS OCTAL
BUFFER/LINE DRIVER
IDT54/74FCT240/A/C
IDT54/74FCT241/A/C
IDT54/74FCT244/A/C
IDT54/74FCT540/A/C
IDT54/74FCT541/A/C
FEATURES:
IDT54/74FCT240/241/244/540/541 equivalent to FAST
TM
speed and drive
IDT54/74FCT240A/241A/244A/540A/541A 25% faster
than FAST
IDT54/74FCT240C/241C/244C/540C/541C up to 55%
faster than FAST
I
OL
= 64mA (commercial) and 48mA (military)
CMOS power levels (1mW typ. static)
Product available in Radiation Tolerant and Radiation
Enhanced versions
Military product compliant to MIL-STD-883, Class B
Meets or exceeds JEDEC Standard 18 specifications
FUNCTIONAL BLOCK DIAGRAMS
2529 cnv* 0103
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
OE
B
OA
0
DB
0
OA
1
DB
1
DB
2
DB
3
OA
2
OA
3
IDT54/74FCT240
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
OE
B
*
OA
0
DB
0
OA
1
DB
1
DB
2
DB
3
OA
2
OA
3
IDT54/74FCT241/244
*OE
B
for 241, OE
B
for 244
OE
A
D
0
OE
B
O
0
*
D
1
D
2
D
3
D
4
D
5
D
6
D
7
O
1
*
O
2
*
O
3
*
O
4
*
O
5
*
O
6
*
O
7
*
IDT54/74FCT540/541
*Logic diagram shown for 'FCT540.
'FCT541 is the non-inverting option.
241 Only
DESCRIPTION:
The IDT octal buffer/line drivers are built using an advanced
dual metal CMOS technology. The IDT54/74FCT240/A/C,
IDT54/74FCT241/A/C and IDT54/74FCT244/A/C are designed
to be employed as memory and address drivers, clock drivers
and bus-oriented transmitter/receivers which provide improved
board density.
The IDT54/74FCT540/A/C and IDT54/74FCT541/A/C are
similar in function to the IDT54/74FCT240/A/C and IDT54/
74FCT244/A/C, respectively, except that the inputs and out-
puts 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.
2606 dwg 0103
1
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a trademark of National Semiconductor Co.
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
7.8
2
PIN CONFIGURATIONS
IDT54/74FCT240
2529 cnv* 0409
2606 cnv* 0409
IDT54/74FCT241/244
IDT54/74FCT540/541
*OE
B
for 241,
OE
B
for 244
*
O
X
for 540, O
X
for 541
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
OE
B
*
OA
0
DB
0
OA
1
DB
1
DB
2
DB
3
OA
2
OA
3
V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DIP/SOIC/CERPACK
TOP VIEW
P20-1
D20-1
SO20-2
&
E20-1
INDEX
DA
1
OB
1
DA
2
OB
2
DA
3
OA
0
DB
0
OA
1
DB
1
OA
2
DA
0
OB
0
OE
A
V
CC
OE
B
*
OB
3
GND
DB
3
OA
3
DB
2
LCC
TOP VIEW
3
2
20 19
1
4
5
6
7
8
18
17
16
15
14
9 10 11 12 13
L20-2
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
OE
B
OA
0
DB
0
OA
1
DB
1
DB
2
DB
3
OA
2
OA
3
V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DIP/SOIC/CERPACK
TOP VIEW
P20-1
D20-1
SO20-2
&
E20-1
INDEX
DA
1
OB
1
DA
2
OB
2
DA
3
OA
0
DB
0
OA
1
DB
1
OA
2
DA
0
OB
0
OE
A
V
CC
OE
B
OB
3
GND
DB
3
OA
3
DB
2
LCC
TOP VIEW
3
2
20 19
1
4
5
6
7
8
18
17
16
15
14
9 10 11 12 13
L20-2
OE
A
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
GND
OE
B
O
0
*
O
1
*
O
2
*
O
3
*
O
5
*
O
7
*
O
4
*
O
6
*
V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DIP/SOIC/CERPACK
TOP VIEW
P20-1
D20-1
SO20-2
&
E20-1
INDEX
D
2
O
0
*
D
0
D
1
OE
A
V
CC
OE
B
GND
LCC
TOP VIEW
O
1
*
O
2
*
O
3
*
O
4
*
D
3
D
4
D
5
D
6
O
7
*
O
6
*
O
5
*
D
7
3
2
20 19
1
4
5
6
7
8
18
17
16
15
14
9 10 11 12 13
L20-2
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
7.8
3
PIN DESCRIPTION
FUNCTION TABLE
NOTE:
2606 tbl 04
1. OE
B
for 241 only.
NOTES:
2606 tbl 05
1. H = High Voltage Level
X = Don't Care
L = Low Voltage Level
Z = High Impedance
2. OE
B
for 241 only.
ABSOLUTE MAXIMUM RATINGS
(1)
CAPACITANCE
(T
A
= +25
C, f = 1.0MHz)
NOTES:
2606 tbl 01
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 +0.5V unless otherwise noted.
2. Input and V
CC
terminals only.
3. Outputs and I/O terminals only.
Symbol
Parameter
(1)
Conditions
Typ.
Max.
Unit
C
IN
Input
Capacitance
V
IN
= 0V
6
10
pF
C
OUT
Output
Capacitance
V
OUT
= 0V
8
12
pF
NOTE:
2606 tbl 02
1. This parameter is measured at characterization but not tested.
Symbol
Rating
Commercial
Military
Unit
V
TERM(2)
Terminal Voltage
with Respect to
GND
0.5 to +7.0
0.5 to +7.0
V
V
TERM(3)
Terminal Voltage
with Respect to
GND
0.5 to V
CC
0.5 to V
CC
V
T
A
Operating
Temperature
0 to +70
55 to +125
C
T
BIAS
Temperature
Under Bias
55 to +125
65 to +135
C
T
STG
Storage
Temperature
55 to +125
65 to +150
C
P
T
Power Dissipation
0.5
0.5
W
I
OUT
DC Output
Current
120
120
mA
Pin Names
Description
OE
A
,
OE
B
3State Output Enable Inputs (Active LOW)
OE
B(1)
3State Output Enable Input (Active HIGH)
Dxx
Inputs
Oxx
Outputs
Inputs
(1)
Outputs
(1)
OE
OE
A
OE
OE
B
OE
B(2)
D
240
241
244
540
541
L
L
H
L
H
L
L
H
L
L
L
H
H
L
H
H
L
H
H
H
L
X
Z
Z
Z
Z
Z
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
7.8
4
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%
NOTES:
2606 tbl 03
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 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.
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
IH
Input HIGH Level
Guaranteed Logic HIGH Level
2.0
--
--
V
V
IL
Input LOW Level
Guaranteed Logic LOW Level
--
--
0.8
V
I
I H
Input HIGH Current
V
CC
= Max.
V
I
= V
CC
--
--
5
A
V
I
= 2.7V
--
--
5
(4)
I
I L
Input LOW Current
V
I
= 0.5V
--
--
5
(4)
V
I
= GND
--
--
5
I
OZH
Off State (High Impedance)
V
CC
= Max.
V
O
= V
CC
--
--
10
A
Output Current
V
O
= 2.7V
--
--
10
(4)
I
OZL
V
O
= 0.5V
--
--
10
(4)
V
O
= GND
--
--
10
V
IK
Clamp Diode Voltage
V
CC
= Min., I
N
= 18mA
--
0.7
1.2
V
I
OS
Short Circuit Current
V
CC
= Max.
(3)
, V
O
= GND
60
120
--
mA
V
OH
Output HIGH Voltage
V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OH
= 32
A
V
HC
V
CC
--
V
V
CC
= Min.
I
OH
= 300
A
V
HC
V
CC
--
V
IN
= V
IH
or V
IL
I
OH
= 12mA MIL.
2.4
4.3
--
I
OH
= 15mA COM'L.
2.4
4.3
--
V
OL
Output LOW Voltage
V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OL
= 300
A
--
GND
V
LC
V
V
CC
= Min.
I
OL
= 300
A
--
GND
V
LC(4)
V
IN
= V
IH
or V
IL
I
OL
= 48mA MIL.
--
0.3
0.55
I
OL
= 64mA COM'L.
--
0.3
0.55
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
7.8
5
POWER SUPPLY CHARACTERISTICS
V
LC
= 0.2V; V
HC
= V
CC
0.2V
NOTES:
2606 tbl 06
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.
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
CC
Quiescent Power Supply Current
V
CC
= Max.
V
IN
V
HC
; V
IN
V
LC
--
0.2
1.5
mA
I
CC
Quiescent Power Supply Current
TTL Inputs HIGH
V
CC
= Max.
V
IN
= 3.4V
(3)
--
0.5
2.0
mA
I
CCD
Dynamic Power Supply
Current
(4)
V
CC
= Max.
Outputs Open
OE
A
=
OE
B
= GND or
OE
A
= GND,
OE
B
= V
CC
One Input Toggling
50% Duty Cycle
V
IN
V
HC
V
IN
V
LC
--
0.15
0.25
mA/
MHz
I
C
Total Power Supply Current
(6)
V
CC
= Max.
Outputs Open
fi = 10MHz
50% Duty Cycle
V
IN
V
HC
V
IN
V
LC
(FCT)
--
1.7
4.0
mA
OE
A
=
OE
B
= GND or
OE
A
= GND,
OE
B
= V
CC
One Bit Toggling
V
IN
= 3.4V
V
IN
= GND
--
2.0
5.0
V
CC
= Max.
Outputs Open
fi = 5MHz
50% Duty Cycle
V
IN
V
HC
V
IN
V
LC
(FCT)
--
3.2
6.5
(5)
OE
A
=
OE
B
= GND or
OE
A
= GND,
OE
B
= V
CC
Eight Bits Toggling
V
IN
= 3.4V
V
IN
= GND
--
5.2
14.5
(5)
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