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IDT74FCT540AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
AUGUST 2000
1999 Integrated Device Technology, Inc.
DSC-5588/-
c
IDT74FCT540AT/CT
INDUSTRIAL TEMPERATURE RANGE
FAST CMOS OCTAL
BUFFER/LINE DRIVER
DESCRIPTION:
The IDT octal buffer/line driver is built using an advanced dual metal
CMOS technology. The FCT540T is similar in function to the FCT240T,
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 DIAGRAM
D
0
D
2
D
3
D
4
D
5
D
6
D
7
D
1
O
1
OE
B
OE
A
O
0
O
2
O
3
O
4
O
5
O
6
O
7
FEATURES:
-
Low input and output leakage
1 A (max.)
-
CMOS power levels
-
True TTL input and output compatibility
V
OH
= 3.3V (typ.)
V
OL
= 0.3V (typ.)
-
Meets or exceeds JEDEC standard 18 specifications
-
A and C speed grades
-
High drive outputs (-15mA I
OH
, 64mA I
OL
)
-
Power off disable outputs permit "live insertion"
-
Available in SOIC, SSOP, and QSOP packages
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INDUSTRIAL TEMPERATURE RANGE
IDT74FCT540AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
SOIC/ SSOP/ QSOP
TOP VIEW
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
GND
O
0
O
1
O
2
O
3
O
5
O
7
O
4
O
6
V
C C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SO20-2
SO20-7
SO20-8
OE
B
OE
A
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Rating
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
+0.5
V
T
STG
Storage Temperature
65 to +150
C
I
OUT
DC Output Current
60 to +120
mA
8T-link
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. Inputs and Vcc terminals only.
3. Outputs and I/O terminals only.
CAPACITANCE (T
A
= +25
O
C, f = 1.0MHz)
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
8T-link
NOTE:
1. This parameter is measured at characterization but not tested.
PIN CONFIGURATION
PIN DESCRIPTION
Pin Names
Description
OE
A
,
OE
B
3State Output Enable Inputs (Active LOW)
Dx
Inputs
Ox
Outputs
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
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
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IDT74FCT540AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= -40C to +85C, 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
(4)
V
CC
= Max.
V
I
= 2.7V
--
--
1
A
I
IL
Input LOW Current
(4)
V
I
= 0.5V
--
--
1
I
OZH
High Impedance Output Current
V
CC
= Max.
V
O
= 2.7V
--
--
1
A
I
OZL
(3-State output pins)
(4)
V
O
= 0.5V
--
--
1
I
I
Input HIGH Current
(4)
V
CC
= Max., V
I
= V
CC
(Max.)
--
--
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
--
0.7
1.2
V
V
H
Input Hysteresis
--
--
200
--
mV
I
CC
Quiescent Power Supply Current
V
CC
= Max., V
IN
=
GND or
V
CC
--
0.01
1
mA
OUTPUT DRIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= Min.
I
OH
= 8mA
2.4
3.3
--
V
V
IN
= V
IH
or V
IL
I
OH
= 15mA
2
3
--
V
OL
Output LOW Voltage
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OL
= 64mA
--
0.3
0.55
V
I
OS
Short Circuit Current
V
CC
= Max, V
O
= GND
(3)
60
120
225
mA
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 V
CC
= 5.0V, +25C 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 thie parameter is 5A at
T
A
= -55C.
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INDUSTRIAL TEMPERATURE RANGE
IDT74FCT540AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
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 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 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.
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
CC
Quiescent Power Supply Current
TTL Inputs HIGH
V
CC
= Max.
V
IN
= 3.4V
(3)
--
0.5
2
mA
I
CCD
Dynamic Power Supply Current
(4)
V
CC
= Max.
Outputs Open
OE
A
= OE
B
= GND
V
IN
= V
CC
V
IN
= GND
--
0.15
0.25
mA/
MHz
One Input Toggling
50% Duty Cycle
I
C
Total Power Supply Current
(6)
V
CC
= Max.
V
IN
= V
CC
--
1.5
3.5
mA
Outputs Open
fi = 10MHz
V
IN
= GND
50% Duty Cycle
OE
A
= OE
B
= GND
V
IN
= 3.4
V
IN
= GND
--
1.8
4.5
One Bit Toggling
V
CC
= Max.
V
IN
= V
CC
--
3
6
(5)
Outputs Open
fi = 2.5MHz
V
IN
= GND
50% Duty Cycle
OE
A
= OE
B
= GND
V
IN
= 3.4
V
IN
= GND
--
5
14
(5)
Eight Bits Toggling
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT540AT
FCT540CT
Symbol
Parameter
Condition
(1)
Min
.(2)
Max
.
Min
.(2)
Max
.
Unit
t
PLH
t
PHL
Propagation Delay
D
N
to
O
N
C
L
= 50pF
R
L
= 500
1.5
4.8
1.5
4.3
ns
t
PZH
t
PZL
Output Enable Time
1.5
6.2
1.5
5.8
ns
t
PHZ
t
PLZ
Output Disable Time
1.5
5.6
1.5
5.2
ns
NOTES:
1. See Test Circuit and Waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
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IDT74FCT540AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
INDUSTRIAL TEMPERATURE RANGE
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
IN PU T
TIM IN G
IN PU T
ASYN CH R ON OUS C ON TROL
PRES ET
CLEAR
ETC.
SYNC HRO N OU S CON TRO L
t
SU
t
H
t
REM
t
SU
t
H
HIGH-LOW -HIGH
PULSE
LO W -H IGH -LOW
PULSE
t
W
1.5V
1.5V
SAM E PHASE
IN PU T TR ANSITION
3V
1.5V
0V
1.5V
V
OH
t
PLH
OU TPUT
OPPOSITE P HASE
IN PU T TR ANSITION
3V
1.5V
0V
t
PLH
t
PH L
t
PH L
V
OL
CO NTR OL
IN PU T
3V
1.5V
0V
3.5V
0V
OU TPUT
NO RM A LLY
LO W
OU TPUT
NO RM A LLY
HIGH
SW ITC H
CLOSE D
SW ITC H
OPEN
V
OL
0.3V
0.3V
t
PLZ
t
PZL
t
PZH
t
PHZ
3.5V
0V
1.5V
1.5V
ENAB LE
DISA BLE
V
OH
PRES ET
CLEAR
CLOC K ENABLE
ETC.
O ctal lin k
O ctal lin k
O ctal lin k
O ctal lin k
O ctal lin k
TEST CIRCUITS AND WAVEFORMS
PROPAGATION DELAY
TEST CIRCUITS FOR ALL OUTPUTS
ENABLE AND DISABLE TIMES
SET-UP, HOLD, AND RELEASE TIMES
PULSE WIDTH
SWITCH POSITION
Test
Switch
Open Drain
Disable Low
Closed
Enable Low
All Other Tests
Open
8-link
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
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
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INDUSTRIAL TEMPERATURE RANGE
IDT74FCT540AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
CORPORATE HEADQUARTERS
for SALES:
2975 Stender Way
800-345-7015 or 408-727-6116
Santa Clara, CA 95054
fax: 408-492-8674
www.idt.com*
*To search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
ORDERING INFORMATION
XX
Tem perature
Range
FCT
IDT
X
Package
X
Device
Type
SO
PY
Q
Sm all Outline IC (SO20-2)
Shrink Small Outline Package (SO20-7)
Quarter-size Small Outline Package (SO20-8)
540AT
540CT
Fast CMOS Octal Buffer/Line Driver
- 40C to +85C
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