
IDT54/74FCT240/A/C
IDT54/74FCT241/A/C
IDT54/74FCT244/A/C
IDT54/74FCT540/A/C
IDT54/74FCT541/A/C
FAST CMOS OCTAL
BUFFER/LINE DRIVER
Integrated Device Technology, Inc.
FEATURES:
DESCRIPTION:
• IDT54/74FCT240/241/244/540/541 equivalent to FASTTM
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
• IOL = 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
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 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.
FUNCTIONAL BLOCK DIAGRAMS
2529 cnv* 01–03
OEA
241 Only
OEA
OEB
OEA
OEB
OEB*
DA0
OA0
DA0
OA0
D0
O0*
OB0
DB0
OB0
DB0
D1
O1*
DA1
OA1
DA1
OA1
D2
O2*
OB1
DB1
OB1
DB1
D3
O3*
DA2
OA2
DA2
OA2
D4
O4*
OB2
DB2
OB2
DB2
D5
O5*
DA3
OA3
DA3
OA3
D6
O6*
OB3
DB3
OB3
DB3
D7
O7*
IDT54/74FCT240
IDT54/74FCT241/244
*OEB for 241, OEB for 244
IDT54/74FCT540/541
*Logic diagram shown for 'FCT540.
'FCT541 is the non-inverting option.
2606 dwg 01–03
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a trademark of National Semiconductor Co.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
1992 Integrated Device Technology, Inc.
7.8
MAY 1992
DSC-4610/3
1
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATIONS
OEB
18
4
17
OA0
DB0
OB1
5
DA2
6
OB2
7
DA3
8
P20-1
D20-1 16
SO20-2 15
&
E20-1 14
13
OB3
GND
9
12
10
11
3 2
OA1
DB1
OA2
DB2
DA1
4
OB1
5
DA2
6
OB2
DA3
7
8
OA3
DB3
DIP/SOIC/CERPACK
TOP VIEW
OEB
19
20 19
18
OA0
17
DB0
16
OA1
15
DB1
14
9 10 11 12 13
OA2
1
L20-2
DB 2
2
3
INDEX
OEA
VCC
VCC
DB 3
20
OA3
OB0
DA1
1
OB3
GND
OEA
DA0
DA 0
2529 cnv* 04–09
OB 0
IDT54/74FCT240
LCC
TOP VIEW
OEB*
18
4
17
OA0
DB0
3 2
DA1
4
OA1
DB1
OB1
5
DA2
6
OA2
OB2
DA3
7
OB1
5
DA2
6
OB2
7
DA3
8
P20-1
D20-1 16
SO20-2 15
&
14
E20-1
13
OB3
GND
9
12
OA3
10
11
DB3
DB2
1
OEB *
19
20 19
18
OA0
17
DB0
16
OA1
15
DB1
14
OA2
L20-2
8
OB3
9 10 11 12 13
DIP/SOIC/CERPACK
TOP VIEW
DB 2
2
3
INDEX
OA3
VCC
OEA
VCC
20
GND
DB 3
OB0
DA1
1
OB0
OEA
DA0
DA 0
IDT54/74FCT241/244
LCC
TOP VIEW
*OEB for 241, OEB for 244
18
OEB
O0*
17
O1*
16
O2*
15
14
O3*
O4*
4
P20-1
D20-1
SO20-2
&
E20-1
5
D4
6
D5
7
D6
8
13
O5*
D7
GND
9
12
O6*
10
11
O7*
1
20 19
18
D2
D3
4
5
17
D4
6
16
O 1*
O 2*
D5
D6
7
15
O 3*
8
14
O 4*
L20-2
O 0*
9 10 11 12 13
D7
D3
3 2
OEB
19
DIP/SOIC/CERPACK
TOP VIEW
LCC
TOP VIEW
*OX for 540, OX for 541
7.8
O 5*
2
3
INDEX
OEA
VCC
VCC
O 6*
20
GND
O 7*
D1
D2
1
D1
OEA
D0
D0
IDT54/74FCT540/541
2606 cnv* 04–09
2
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
FUNCTION TABLE
Inputs(1)
OEB OEB(2)
Outputs(1)
241 244 540
Pin Names
OEA, OEB
Description
3–State Output Enable Inputs (Active LOW)
OEA
D
240
OEB (1)
3–State Output Enable Input (Active HIGH)
L
L
H
L
H
L
L
H
L
Dxx
Inputs
L
L
H
H
L
H
H
L
H
Outputs
H
H
L
X
Z
Z
Z
Z
Oxx
NOTE:
1. OEB for 241 only.
2606 tbl 04
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Rating
VTERM(2) Terminal Voltage
with Respect to
GND
VTERM(3) Terminal Voltage
with Respect to
GND
TA
Operating
Temperature
TBIAS
Temperature
Under Bias
TSTG
Storage
Temperature
PT
Power Dissipation
IOUT
DC Output
Current
NOTES:
1. H = High Voltage Level
X = Don’t Care
L = Low Voltage Level
Z = High Impedance
2. OEB for 241 only.
541
Z
2606 tbl 05
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Commercial
Military
–0.5 to +7.0 –0.5 to +7.0
Unit
V
–0.5 to VCC
–0.5 to VCC
V
0 to +70
–55 to +125
°C
–55 to +125
–65 to +135
°C
–55 to +125
–65 to +150
°C
0.5
0.5
W
120
120
mA
Symbol
CIN
COUT
Parameter
Input
Capacitance
Output
Capacitance
(1)
Conditions
VIN = 0V
VOUT = 0V
Typ.
6
Max.
10
Unit
pF
8
12
pF
NOTE:
1. This parameter is measured at characterization but not tested.
2606 tbl 02
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 VCC by +0.5V unless otherwise noted.
2. Input and VCC terminals only.
3. Outputs and I/O terminals only.
7.8
3
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: VLC = 0.2V; VHC = VCC – 0.2V
Commercial: TA = 0°C to +70°C, V CC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%
Parameter
Input HIGH Level
Test Conditions(1)
Guaranteed Logic HIGH Level
VIL
Input LOW Level
II H
Input HIGH Current
Symbol
VIH
II L
IOZH
Min.
2.0
Typ.(2)
—
Max.
—
Guaranteed Logic LOW Level
—
—
0.8
V
VCC = Max.
VI = VCC
—
—
5
µA
VI = 2.7V
—
—
5(4)
VI = 0.5V
—
—
–5(4)
VI = GND
—
—
–5
VO = VCC
—
—
10
Input LOW Current
Off State (High Impedance)
VCC = Max.
Output Current
IOZL
VIK
Clamp Diode Voltage
µA
VO = 2.7V
—
—
10(4)
VO = 0.5V
—
—
–10(4)
VO = GND
—
—
–10
—
–0.7
–1.2
V
VCC = Min., IN = –18mA
Max.(3) ,
Unit
V
IOS
Short Circuit Current
VCC =
VO = GND
–60
–120
—
mA
VOH
Output HIGH Voltage
VCC = 3V, VIN = VLC or VHC, IOH = –32µA
VHC
VCC
—
V
VOL
Output LOW Voltage
VCC = Min.
IOH = –300µA
VHC
VCC
—
VIN = VIH or VIL
IOH = –12mA MIL.
2.4
4.3
—
IOH = –15mA COM'L.
2.4
4.3
—
—
GND
VLC
VCC = 3V, VIN = VLC or VHC, IOL = 300µA
VCC = Min.
IOL = 300µA
—
GND
VLC(4)
VIN = VIH or VIL
IOL = 48mA MIL.
—
0.3
0.55
IOL = 64mA COM'L.
—
0.3
0.55
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.
7.8
V
2606 tbl 03
4
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
VLC = 0.2V; VHC = VCC – 0.2V
Symbol
ICC
Parameter
Quiescent Power Supply Current
∆ICC
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply
Current(4)
ICCD
IC
Total Power Supply Current (6)
Test Conditions(1)
VCC = Max.
VIN ≥ VHC; V IN ≤ V LC
VCC = Max.
VIN = 3.4V(3)
VCC = Max.
Outputs Open
OEA = OEB = GND or
OEA = GND,
OEB = VCC
One Input Toggling
50% Duty Cycle
VCC = Max.
Outputs Open
fi = 10MHz
50% Duty Cycle
OEA = OEB = GND or
OEA = GND,
OEB = VCC
One Bit Toggling
VCC = Max.
Outputs Open
fi = 5MHz
50% Duty Cycle
OEA = OEB = GND or
OEA = GND,
OEB = VCC
Eight Bits Toggling
Min.
—
Typ.(2)
0.2
Max.
1.5
Unit
mA
—
0.5
2.0
mA
VIN ≥ VHC
VIN ≤ VLC
—
0.15
0.25
mA/
MHz
VIN ≥ VHC
VIN ≤ VLC
(FCT)
—
1.7
4.0
mA
VIN = 3.4V
VIN = GND
—
2.0
5.0
VIN ≥ VHC
VIN ≤ VLC
(FCT)
—
3.2
6.5 (5)
VIN = 3.4V
VIN = GND
—
5.2
14.5 (5)
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. Per TTL driven input (VIN = 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. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fiNi)
ICC = Quiescent Current
∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fi = Input Frequency
Ni = Number of Inputs at fi
All currents are in milliamps and all frequencies are in megahertz.
7.8
2606 tbl 06
5
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT240(1,2)
54/74FCT240
Com'l.
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Parameter
Propagation Delay
DN to ON
Condition
CL = 50pF
RL = 500Ω
54/74FCT240A
Mil.
Com'l.
54/74FCT240C
Mil.
Com'l.
Mil.
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Unit
1.5
8.0
1.5
9.0
1.5
4.8
1.5
5.1
1.5
4.3
1.5
4.7
ns
Output Enable Time
1.5 10.0
1.5 10.5
1.5
6.2
1.5
6.5
1.5
5.8
1.5
6.5
ns
Output Disable Time
1.5
1.5 10.0
1.5
5.6
1.5
5.9
1.5
5.2
1.5
5.7
ns
9.5
2606 tbl 07
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT241 AND FCT244(1,2)
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT241 AND FCT244(1,2)
54/74FCT241/244
Com'l.
Symbol
Parameter
t PLH
t PHL
Propagation Delay
DN to ON
t PZH
t PZL
t PHZ
t PLZ
Condition
CL = 50pF
54/74FCT241A/244A
Mil.
Com'l.
Mil.
54/74FCT241C/244C
Com'l.
Mil.
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
Unit
1.5
6.5
1.5
7.0
1.5
4.8
1.5
5.1
1.5
4.1
1.5
4.6
ns
Output Enable Time
1.5
8.0
1.5
8.5
1.5
6.2
1.5
6.5
1.5
5.8
1.5
6.5
ns
Output Disable Time
1.5
7.0
1.5
7.5
1.5
5.6
1.5
5.9
1.5
5.2
1.5
5.7
ns
RL = 500Ω
2606 tbl 08
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT540 AND FCT541(1,2)
54/74FCT540/541
Com'l.
Symbol
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Parameter
Propagation Delay
DN to ON
IDT54/74FCT540
Propagation Delay
DN to ON
IDT54/74FCT541
Condition
CL = 50pF
RL = 500Ω
Mil.
54/74FCT540A/541A
54/74FCT540C/541C
Com'l.
Com'l.
Mil.
Mil.
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Unit
1.5
8.5
1.5
9.5
1.5
4.8
1.5
5.1
1.5
4.3
1.5
4.7
ns
1.5
8.0
1.5
9.0
1.5
4.8
1.5
5.1
1.5
4.1
1.5
4.6
ns
Output Enable Time
1.5 10.0
1.5 10.5
1.5
6.2
1.5
6.5
1.5
5.8
1.5
6.5
ns
Output Disable Time
1.5
1.5 10.0
1.5
5.6
1.5
5.9
1.5
5.2
1.5
5.7
ns
9.5
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
2606 tbl 09
7.8
6
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
SWITCH POSITION
TEST CIRCUITS FOR ALL OUTPUTS
VCC
7.0V
500Ω
V OUT
VIN
Pulse
Generator
D.U.T.
50pF
RT
500Ω
SET-UP, HOLD AND RELEASE TIMES
Closed
All Other Tests
Open
3V
1.5V
0V
tH
TIMING
INPUT
3V
1.5V
0V
LOW-HIGH-LOW
PULSE
3V
1.5V
0V
HIGH-LOW-HIGH
PULSE
1.5V
tW
t REM
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
Open Drain
Disable Low
Enable Low
PULSE WIDTH
DATA
INPUT
ASYNCHRONOUS CONTROL
Switch
DEFINITIONS:
2606 tbl 10
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
CL
t SU
Test
t SU
1.5V
3V
1.5V
0V
tH
PROPAGATION DELAY
ENABLE AND DISABLE TIMES
ENABLE
DISABLE
3V
3V
1.5V
SAME PHASE
INPUT TRANSITION
t PLH
t PHL
CONTROL
INPUT
OUTPUT
NORMALLY SWITCH
LOW CLOSED
t PZH
VOL
t PLH
t PHL
OUTPUT SWITCH
NORMALLY OPEN
HIGH
3V
OPPOSITE PHASE
INPUT TRANSITION
1.5V
0V
t PLZ
t PZL
0V
VOH
1.5V
OUTPUT
1.5V
3.5V
1.5V
3.5V
0.3V
V OL
t PHZ
0.3V
1.5V
0V
V OH
0V
0V
NOTES
2606 drw 10
1. Diagram shown for input Control Enable-LOW and input Control
Disable-HIGH.
2. Pulse Generator for All Pulses: Rate ≤ 1.0 MHz; ZO ≤ 50Ω; tF ≤ 2.5ns;
tR ≤ 2.5ns.
7.8
7
IDT54/74FCT240/241/244/540/541/A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT
XXXX
XX
FCT
Temp. Range
Device Type
X
Package
X
Process
Blank
B
Commercial
MIL-STD-883, Class B
P
D
SO
L
E
Plastic DIP
CERDIP
Small Outline IC
Leadless Chip Carrier
CERPACK
240
241
244
540
541
240A
241A
244A
540A
541A
240C
241C
244C
540C
541C
Inverting Octal Buffer/Line Driver
Non-Inverting Octal Buffer/Line Driver
Non-Inverting Octal Buffer/Line Driver
Inverting Octal Buffer/Line Driver
Non-Inverting Octal Buffer/Line Driver
Fast Inverting Octal Buffer/Line Driver
Fast Non-Inverting Octal Buffer/Line Driver
Fast Non-Inverting Octal Buffer/Line Driver
Fast Inverting Octal Buffer/Line Driver
Fast Non-Inverting Octal Buffer/Line Driver
Super Fast Inverting Octal Buffer/Line Driver
Super Fast Non-Inverting Octal Buffer/Line Driver
Super Fast Non-Inverting Octal Buffer/Line Driver
Super Fast Inverting Octal Buffer/Line Driver
Super Fast Non-Inverting Octal Buffer/Line Driver
54
74
–55°C to +125°C
0°C to +70°C
2606 cnv* 15
7.8
8