INDUSTRIAL TEMPERATURE RANGE
IDT74FCT240A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
1
JUNE 2002
INDUSTRIAL TEMPERATURE RANGE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2002 Integrated Device Technology, Inc.
DSC-5419/2
FEATURES:
IDT74FCT240A 25% faster than FAST
IDT74FCT240C up to 55% faster than FAST
64mA I
OL
CMOS power levels (1mW typ. static)
Meets or exceeds JEDEC standard 18 specifications
Available in SOIC package
FUNCTIONAL BLOCK DIAGRAM
IDT74FCT240A/C
FAST CMOS OCTAL
BUFFER/LINE DRIVER
DESCRIPTION:
The FCT240 octal buffer/line driver is built using an advanced dual metal
CMOS technology. The FCT240 is designed to be employed as a memory
and address driver, clock driver, and bus-oriented transmitter/receiver
which provides improved board density.
O E
B
O A
0
DB
0
O A
1
DB
1
O A
2
DB
2
O A
3
DB
3
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
DA
0
O E
A
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
INDUSTRIAL TEMPERATURE RANGE
2
IDT74FCT240A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
PIN CONFIGURATION
SOIC
TOP VIEW
FUNCTION TABLE
(1)
Inputs
OE
A
OE
B
D
Outputs
L
L
L
H
L
L
H
L
H
H
X
Z
NOTE:
1. H = HIGH Voltage Level
X = Don't Care
L = LOW Voltage Level
Z = High Impedance
Pin Names
Description
OE
A
, OE
B
3-State Output Enable Inputs (Active LOW)
Dxx
Inputs
Oxx
Outputs
PIN DESCRIPTION
2
3
1
16
15
14
11
19
18
20
17
13
12
5
6
7
4
8
9
10
DA
1
DA
0
OB
0
V
CC
OB
1
DA
3
DA
2
OB
2
OB
3
GND
OE
B
OA
1
OA
0
DB
0
DB
1
OA
3
OA
2
DB
2
DB
3
OE
A
Symbol
Description
Max
Unit
V
TERM
(2)
Terminal Voltage with Respect to GND
0.5 to +7
V
V
TERM
(3)
Terminal Voltage with Respect to GND
0.5 to V
CC
V
T
A
Operating Temperature
0 to +70
C
T
BIAS
Temperature under BIAS
55 to +125
C
T
STG
Storage Temperature
55 to +125
C
P
T
Power Dissipation
0.5
W
I
OUT
DC Output Current
120
mA
ABSOLUTE MAXIMUM RATINGS
(1)
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
Vcc by +0.5V unless otherwise noted.
2. Input and Vcc terminals only.
3. Output 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
CAPACITANCE
(T
A
= +25C, F = 1.0MHz)
NOTE:
1. This parameter is measured at characterization but not tested.
INDUSTRIAL TEMPERATURE RANGE
IDT74FCT240A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
3
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
= 0C to +70C, V
CC
= 5.0V 5%
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
IH
Input HIGH Level
Guaranteed Logic HIGH Level
2
--
--
V
V
IL
Input LOW Level
Guaranteed Logic LOW Level
--
--
0.8
V
I
IH
Input HIGH Current
V
CC
= Max.
V
I
= V
CC
--
--
5
A
V
I
= 2.7V
--
--
5
(4)
I
IL
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
Vcc = Min., I
N
= 18mA
--
0.7
1.2
V
I
OS
Short Circuit Current
Vcc = Max.
(3)
, V
O
= GND
60
120
--
mA
V
OH
Output HIGH Voltage
Vcc = 3V, V
IN
= V
LC
or V
HC
, I
OH
= 32A
V
HC
V
CC
--
V
Vcc = Min.
I
OH
= 300A
V
HC
V
CC
--
V
IN
= V
IH
or V
IL
I
OH
= 15mA
2.4
4.3
--
V
OL
Output LOW Voltage
Vcc = 3V, V
IN
= V
LC
or V
HC
, I
OL
= 300A
--
GND
V
LC
V
Vcc = Min.
I
OL
= 300A
--
GND
V
LC
(4)
V
IN
= V
IH
or V
IL
I
OL
= 64mA
--
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, +25C 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.
INDUSTRIAL TEMPERATURE RANGE
4
IDT74FCT240A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
FCT240A
FCT240C
Symbol
Parameter
Condition
(1)
Min.
(2)
Max.
Min.
(2)
Max.
Unit
t
PLH
Propagation Delay
C
L
= 50pF
1.5
4.8
1.5
4.3
ns
t
PHL
Dx to Ox
R
L
= 500
t
PZH
Output Enable Time
1.5
6.2
1.5
5.8
ns
t
PZL
t
PHZ
Output Disable Time
1.5
5.6
1.5
5.2
ns
t
PLZ
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25C 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
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 + fiNi)
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)
fi = Input Frequency
Ni = Number of Inputs at fi
All currents are in milliamps and all frequencies are in megahertz.
POWER SUPPLY CHARACTERISTICS
V
LC
= 0.2V; V
HC
= V
CC
- 0.2V
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
CC
Quiescent Power Supply Current
V
CC
= Max.
--
0.2
1.5
mA
V
IN
V
HC
; V
IN
V
LC
I
CC
Quiescent Power Supply Current
V
CC
= Max.
--
0.5
2
mA
TTL Inputs HIGH
V
IN
= 3.4V
(3)
I
CCD
Dynamic Power Supply
V
CC
= Max.
V
IN
V
HC
--
0.15
0.25
mA/
Current
(4)
Outputs Open
V
IN
V
LC
MHz
OE
A
= OE
B
= GND
One Input Toggling
50% Duty Cycle
I
C
Total Power Supply Current
(6)
V
CC
= Max.
V
IN
V
HC
--
1.7
4
mA
Outputs Open
V
IN
V
LC
f
I
= 10MHz
(FCT)
50% Duty Cycle
V
IN
= 3.4V
--
2
5
OE
A
= OE
B
= GND
V
IN
= GND
One Bit Toggling
V
CC
= Max.
V
IN
V
HC
--
3.2
6.5
(5)
Outputs Open
V
IN
V
LC
f
I
= 2.5MHz
(FCT)
50% Duty Cycle
V
IN
= 3.4V
--
5.2
14.5
(5)
OE
A
= OE
B
= GND
V
IN
= GND
Eight Bits Toggling
INDUSTRIAL TEMPERATURE RANGE
IDT74FCT240A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
5
Pulse
Generator
R
T
D.U.T
.
V
CC
V
IN
C
L
V
OUT
50pF
500
500
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
t
SU
t
H
t
REM
t
SU
t
H
HIGH-LOW-HIGH
PULSE
LOW-HIGH-LOW
PULSE
t
W
1.5V
1.5V
SAME PHASE
INPUT TRANSITION
3V
1.5V
0V
1.5V
V
OH
t
PLH
OUTPUT
OPPOSITE PHASE
INPUT TRANSITION
3V
1.5V
0V
t
PLH
t
PHL
t
PHL
V
OL
CONTROL
INPUT
3V
1.5V
0V
3.5V
0V
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
CLOSED
SWITCH
OPEN
V
OL
0.3V
0.3V
t
PLZ
t
PZL
t
PZH
t
PHZ
3.5V
0V
1.5V
1.5V
ENABLE
DISABLE
V
OH
PRESET
CLEAR
CLOCK ENABLE
ETC.
Octal link
Octal link
Octal link
Octal link
Octal link
TEST CIRCUITS AND WAVEFORMS
Propagation Delay
Test Circuits for All Outputs
Enable and Disable Times
Set-Up, Hold, and Release Times
Pulse Width
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
2. Pulse Generator for All Pulses: Rate
1.0MHz; t
F
2.5ns; t
R
2.5ns.
Test
Switch
Open Drain
Disable Low
Closed
Enable Low
All Other Tests
Open
SWITCH POSITION
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
INDUSTRIAL TEMPERATURE RANGE
6
IDT74FCT240A/C
FAST CMOS OCTAL BUFFER/LINE DRIVER
ORDERING INFORMATION
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
2975 Stender Way
800-345-7015 or 408-727-6116
logichelp@idt.com
Santa Clara, CA 95054
fax: 408-492-8674
(408) 654-6459
www.idt.com
IDT XX
Temp. Range
XXXX
Device Type
X
Package
SO
240A
240C
Small Outline IC
Octal Buffer/Line Driver
74
0C to +70C
FCT
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