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
6.8 1
Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES DECEMBER 1995
1996 Integrated Device Technology, Inc. 6.8 DSC-2565/6
1
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.
FAST CMOS OCTAL
BUFFER/LINE
DRIVERS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
IDT54/74FCT240T/AT/CT/DT - 2240T/AT/CT
IDT54/74FCT244T/AT/CT/DT - 2244T/AT/CT
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.)
– VOL = 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
2565 drw 03
2565 drw 02
2565 drw 01
DA0
DA1
DA2
DA3
DB0
DB1
DB2
DB3
FCT240/2240T
DA0
OB0
DA1
OB1
DA2
OB2
DA3
OB3
OA0
DB0
OA1
DB1
DB2
DB3
OA2
OA3
FCT244/2244T
D0O0
D1
D2
D3
D4
D5
D6
D7
O1
O2
O3
O4
O5
O6
O7
FCT540/541/2541T
*Logic diagram shown for 'FCT540.
'FCT541/2541T is the non-inverting option.
OE
A
OE
B
OE
A
OE
B
OE
A
OB
0
OB
1
OB
2
OB3
OE
B
OA
0
OA
1
OA
2
OA
3
FUNCTIONAL BLOCK DIAGRAMS
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
6.8 2
PIN CONFIGURATIONS
FCT240/2240T
FCT244/2244T
2565 drw 08
2565 drw 04 2565 drw 07
DA0
DA1
DA2
DA3
GND
DB0
DB1
DB2
DB3
VCC1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
P20-1
D20-1
SO20-2
SO20-7
SO20-8
&
E20-1
INDEX
DA1
DA2
DA3
DB0
DB1
DA0
OB0
OEA
VCC
OEB
OB3
GND
DB3
OA3
DB2
LCC
TOP VIEW
3 2 20 19
1
4
5
6
7
8
18
17
16
15
14
9 10111213
L20-2
OEA
OB0
OB1
OB2
OB3
OEB
OA0
OA1
OA2
OA3
OB1
OB2
OA0
OA1
OA2
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
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/SSOP/QSOP/CERPACK
TOP VIEW
P20-1
D20-1
SO20-2
SO20-7
SO20-8
&
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
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
910 1213
L20-2
11
OE
B
OE
A
OE
A
2565 drw 05
FCT540/541/2541T
D0
D2
D3
D4
D5
D6
D7
GND
O0*
O1*
O2*
O3*
O5*
O7*
O4*
O6*
VCC1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
DIP/SOIC/QSOP/CERPACK
TOP VIEW
P20-1
D20-1
SO20-2
SO20-8
&
E20-1
INDEX
D2
D3
D4
D5
D6
O0*
O1*
O2*
O3*
O4*
LCC
TOP VIEW
3 2 20 19
1
4
5
6
7
8
18
17
16
15
14
9 10111213
L20-2
D1
D0
VCC
D7
GND
O7*
O6*
O5*
OEA
OEA
OEB
OEB
D1
2565 drw 06 2565 drw 09
*
O
x for 540, Ox for 541/2541T
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
6.8 3
PIN DESCRIPTION FUNCTION TABLE
ABSOLUTE MAXIMUM RATINGS(1) CAPACITANCE (TA = +25°C, f = 1.0MHz)
Symbol Rating Commercial Military Unit
VTERM(2) Terminal Voltage
with Respect to
GND
–0.5 to +7.0 –0.5 to +7.0 V
VTERM(3) Terminal Voltage
with Respect to
GND
–0.5 to
VCC +0.5 –0.5 to
VCC +0.5 V
TAOperating
Temperature 0 to +70 –55 to +125 °C
TBIAS Temperature
Under Bias –55 to +125 –65 to +135 °C
TSTG Storage
Temperature –55 to +125 –65 to +150 °C
PTPower Dissipation 0.5 0.5 W
IOUT DC Output
Current –60 to +120 –60 to +120 mA
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
VCC by +0.5V unless otherwise noted.
2. Input and VCC terminals only.
3. Outputs and I/O terminals only.
NOTES: 2565 tbl 02
1. H = High Voltage Level
X = Don’t Care
L = Low Voltage Level
Z = High Impedance
Symbol Parameter(1) Conditions Typ. Max. Unit
CIN Input
Capacitance VIN = 0V 6 10 pF
COUT Output
Capacitance VOUT = 0V 8 12 pF
2565 lnk 04
NOTE:
1. This parameter is measured at characterization but not tested.
Pin Names Description
OE
A,
OE
B3–State Output Enable Inputs (Active LOW)
Dxx Inputs
Oxx Outputs
2565 tbl 01
Inputs(1) Outputs(1)
OE
OE
A
OE
OE
BD 240 244 540 541
LLLHLHL
LLHLHLH
H H X ZZZZ
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
6.8 4
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: TA = 0°C to +70°C, VCC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
VIH Input HIGH Level Guaranteed Logic HIGH Level 2.0 — — V
VIL Input LOW Level Guaranteed Logic LOW Level — — 0.8 V
II H Input HIGH Current(4) VCC = Max. VI = 2.7V — — ±1µA
II L Input LOW Current(4) VI = 0.5V — — ±1
IOZH High Impedance Output Current VCC = Max. VO = 2.7V — — ±1µA
IOZL (3-State Output pins)(4) VO = 0.5V — — ±1
II Input HIGH Current(4) VCC = Max., VI = VCC (Max.) — — ±1µA
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V
VHInput Hysteresis — — 200 — mV
ICC Quiescent Power Supply Current VCC = Max., VIN = GND or VCC — 0.01 1 mA
2565 lnk 05
OUTPUT DRIVE CHARACTERISTICS FOR FCT240/244/540/541T
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
VOH Output HIGH Voltage VCC = Min.
VIN = VIH or VIL IOH = –6mA MIL.
IOH = –8mA COM'L. 2.4 3.3 — V
IOH = –12mA MIL.
IOH = –15mA COM'L. 2.0 3.0 — V
VOL Output LOW Voltage VCC = Min.
VIN = VIH or VIL IOL = 48mA MIL.
IOL = 64mA COM'L. — 0.3 0.55 V
IOS Short Circuit Current VCC = Max., VO = GND(3) –60 –120 –225 mA
2565 lnk 06
OUTPUT DRIVE CHARACTERISTICS FOR FCT2240/2244/2541T
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 TA = –55°C.
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
IODL Output LOW Current VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V(3) 16 48 —mA
IODH Output HIGH Current VCC = 5V, VIN = VIH or V
IL, VOUT = 1.5V(3) –16 –48 —mA
VOH Output HIGH Voltage VCC = Min.
VIN = VIH or VIL IOH = –12mA MIL.
IOH = –15mA COM'L. 2.4 3.3 — V
VOL Output LOW Voltage VCC = Min.
VIN = VIH or VIL IOL = 12mA — 0.3 0.50 V
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
6.8 5
POWER SUPPLY CHARACTERISTICS
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
∆ICC Quiescent Power Supply Current
TTL Inputs HIGH VCC = Max.
VIN = 3.4V(3) — 0.5 2.0 mA
ICCD Dynamic Power Supply
Current(4) VCC = Max.
Outputs Open
OE
A =
OE
B = GND
VIN = VCC
VIN = GND FCTxxxT — 0.15 0.25 mA/
MHz
One Input Toggling
50% Duty Cycle FCT2xxxT — 0.06 0.12
ICTotal Power Supply Current(6) VCC = Max. VIN = VCC FCTxxxT — 1.5 3.5 mA
Outputs Open
fi = 10MHz VIN = GND FCT2xxxT — 0.6 2.2
50% Duty Cycle
OE
A =
OE
B = GND VIN = 3.4 FCTxxxT — 1.8 4.5
One Bit Toggling VIN = GND FCT2xxxT 0.9 3.2
VCC = Max. VIN = VCC FCTxxxT — 3.0 6.0(5)
Outputs Open
fi = 2.5MHz VIN = GND FCT2xxxT — 1.2 3.4(5)
50% Duty Cycle
OE
A =
OE
B = GND VIN = 3.4 FCTxxxT — 5.0 14.0(5)
Eight Bits Toggling VIN = GND FCT2xxxT — 3.2 11.4(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.
2565 tbl 08
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
6.8 6
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT240/2240T
2565 tbl 09
2565 tbl 10
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT244/2244T
2565 tbl 11
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
2565 tbl 12
FCT240T
FCT2240T FCT240AT
FCT2240AT
Com'l. Mil. Com'l. Mil.
Symbol Parameter Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH
tPHL Propagation Delay
DN to
O
NCL = 50pF
RL = 500Ω1.5 8.0 1.5 9.0 1.5 4.8 1.5 5.1 ns
tPZH
tPZL Output Enable Time 1.5 10.0 1.5 10.5 1.5 6.2 1.5 6.5 ns
tPHZ
tPLZ Output Disable Time 1.5 9.5 1.5 10.0 1.5 5.6 1.5 5.9 ns
FCT240CT
FCT2240CT FCT240DT
Com'l. Mil. Com'l. Mil.
Symbol Parameter Condition
(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max.
Unit
t
PLH
t
PHL
Propagation Delay
D
N
to
O
N
C
L
= 50pF
R
L
= 500
Ω
1.5 4.3 1.5 4.7 1.5 3.6 — — ns
t
PZH
t
PZL
Output Enable Time 1.5 5.8 1.5 6.5 1.5 4.8 — — ns
t
PHZ
t
PLZ
Output Disable Time 1.5 5.2 1.5 5.7 1.5 4.0 — — ns
FCT244T
FCT2244T FCT244AT
FCT2244AT
Com'l. Mil. Com'l. Mil.
Symbol Parameter Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH
tPHL Propagation Delay
DN to ONCL = 50pF
RL = 500Ω1.5 6.5 1.5 7.0 1.5 4.8 1.5 5.1 ns
tPZH
tPZL Output Enable Time 1.5 8.0 1.5 8.5 1.5 6.2 1.5 6.5 ns
tPHZ
tPLZ Output Disable Time 1.5 7.0 1.5 7.5 1.5 5.6 1.5 5.9 ns
FCT244CT
FCT2244CT FCT244DT
Com'l. Mil. Com'l. Mil.
Symbol Parameter Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH
tPHL Propagation Delay
DN to ONCL = 50pF
RL = 500Ω1.5 4.1 1.5 4.6 1.5 3.6 — — ns
tPZH
tPZL Output Enable Time 1.5 5.8 1.5 6.5 1.5 4.8 — — ns
tPHZ
tPLZ Output Disable Time 1.5 5.2 1.5 5.7 1.5 4.0 — — ns
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
6.8 7
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT540/541/2541T
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
2565 tbl 13
FCT540T/541T
FCT2541T FCT540AT/541AT
FCT2541AT FCT540CT/541CT
FCT2541CT
Com'l. Mil. Com'l. Mil. Com'l. Mil.
Symbol Parameter Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH
tPHL Propagation Delay
DN to
O
N
FCT540
CL = 50pF
RL = 500Ω1.5 8.5 1.5 9.5 1.5 4.8 1.5 5.1 1.5 4.3 1.5 4.7 ns
tPLH
tPHL Propagation Delay
DN to ON
FCT541/2541T
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
tPZH
tPZL 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
tPHZ
tPLZ Output Disable Time 1.5 9.5 1.5 10.0 1.5 5.6 1.5 5.9 1.5 5.2 1.5 5.7 ns
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
6.8 8
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS SWITCH POSITION
SET-UP, HOLD AND RELEASE TIMES PULSE WIDTH
Test Switch
Disable Low
Enable Low
Closed
All Other Tests Open
Open Drain
DEFINITIONS:
CL= Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
2565 drw 10
2565 drw 14
2565 drw 11
2565 drw 12
2565 drw 13
Pulse
Generator
RT
D.U.T.
VCC
VIN
CL
VOUT
50pF 500Ω
500Ω
7.0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
tSU tH
tREM
tSU tH
HIGH-LOW-HIGH
PULSE
LOW-HIGH-LOW
PULSE
tW
1.5V
1.5V
SAME PHASE
INPUT TRANSITION
3V
1.5V
0V
1.5V
VOH
tPLH
OUTPUT
OPPOSITE PHASE
INPUT TRANSITION
3V
1.5V
0V
tPLH tPHL
tPHL
VOL
CONTROL
INPUT
3V
1.5V
0V
3.5V
0V
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
CLOSED
SWITCH
OPEN
VOL
0.3V
0.3V
tPLZtPZL
tPZH tPHZ
3.5V
0V
1.5V
1.5V
ENABLE DISABLE
VOH
PRESET
CLEAR
CLOCK ENABLE
ETC.
PROPAGATION DELAY ENABLE AND DISABLE TIMES
2565 drw 14
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-
HIGH
2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns
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
6.8 9
ORDERING INFORMATION
2565 drw 15
IDT XX
Temp. Range XXXX
Device Type X
Package X
Process
Blank
B
P
D
SO
L
E
PY
Q
240T
244T
540T
541T
240AT
244AT
540AT
541AT
240CT
244CT
540CT
541CT
240DT
244DT
Commercial
MIL-STD-883, Class B
Plastic DIP
CERDIP
Small Outline IC
Leadless Chip Carrier
CERPACK
Shrink Small Outline Package
Quarter-size Small Outline Package
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
54
74 –55°C to +125°C
0°C to +70°C
FCT X
Family
Blank
2High Drive
Balanced Drive
