3.3V CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVERS
Integrated Device Technology, Inc.
IDT54/74FCT3245/A
FEATURES:
• 0.5 MICRON CMOS Technology
• ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
• 25 mil Center SSOP and QSOP Packages
• Extended commercial range of -40°C to +85°C
• V
CC
= 3.3V
±0.3V,
Normal Range or
V
CC
= 2.7V to 3.6V, Extended Range
• CMOS power levels (0.4µW typ. static)
• Rail-to-Rail output swing for increased noise margin
• Military product compliant to MIL-STD-883, Class B
DESCRIPTION:
The FCT3245/A octal transceivers are built using ad-
vanced dual metal CMOS technology. These high-speed,
low-power transceivers are ideal for synchronous communi-
cation between two busses (A and B). The direction control
pin (DIR) controls the direction of data flow. The output enable
pin (
OE
) overrides the direction control and disables both
ports. All inputs are designed with hysteresis for improved
noise margin.
The FCT3245/A have series current limiting resistors.
These offer low ground bounce, minimal undershoot, and
controlled output fall times-reducing the need for external
series terminating resistors.
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
DIR
1
2
3
4
5
6
7
8
9
10
P20-1
D20-1
SO20-2
SO20-7
SO20-8
&
E20-1
20
19
18
17
16
15
14
13
12
11
Vcc
OE
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
DIR
OE
A
1
B
1
A
2
B
2
A
3
B
3
A
4
B
4
A
5
B
5
A
6
B
6
A
7
B
7
A
8
B
8
2650 drw 01
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
GND
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
DIR
V
CC
A
2
A
1
OE
INDEX
2650 drw 02
3 2
A
3
A
4
A
5
A
6
A
7
4
5
6
7
8
L20-2
1
20 19
18
17
16
15
14
B
1
B
2
B
3
B
4
B
5
9 10 11 12 13
GND
A
8
B
8
B
7
B
6
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
LCC
TOP VIEW
2650 drw 03
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996
Integrated Device Technology, Inc.
FEBRUARY 1996
DSC-2650/5
8.12
1
IDT54/74FCT3245/A
3.3V CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names
FUNCTION TABLE
(1)
Inputs
OE
DIR
Ax
Bx
Description
Output Enable Input (Active LOW)
Direction Control Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
2650 tbl 01
OE
L
L
H
DIR
L
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
2650 tbl 02
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High Impedance
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Rating
Commercial
Military
V
TERM(2)
Terminal Voltage
–0.5 to +4.6 –0.5 to +4.6
with Respect to
GND
V
TERM(3)
Terminal Voltage
–0.5 to +7.0 –0.5 to +7.0
with Respect to
GND
(4)
Terminal Voltage
–0.5 to
V
TERM
–0.5 to
with Respect to
V
CC
+ 0.5
V
CC
+ 0.5
GND
T
A
Operating
–40 to +85 –55 to +125
Temperature
T
BIAS
Temperature
–55 to +125 –65 to +135
Under Bias
T
STG
Storage
–55 to +125 –65 to +150
Temperature
P
T
Power Dissipation
1.0
1.0
I
OUT
DC Output
Current
–60 to +60
–60 to +60
Unit
V
CAPACITANCE
(T
A
= +25°C, f = 1.0MHz)
Symbol
Parameter
(1)
C
IN
Input
Capacitance
C
I/O
I/O
Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
3.5
4.0
Max. Unit
6.0
pF
8.0
pF
2650 lnk 04
V
V
°C
°C
°C
W
mA
NOTE:
1. This parameter is measured at characterization but not tested.
2650 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 condi-
tions above those indicated in the operational sections of this specifica-
tion is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
2. Vcc terminals.
3. Input terminals.
4. Output and I/O terminals.
8.12
2
IDT54/74FCT3245/A
3.3V CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: T
A
= –40°C to +85°C, V
CC
= 2.7V to 3.6V; Military: T
A
= –55°C to +125°C, V
CC
= 2.7V to 3.6V
Symbol
V
IH
V
IL
I
I H
I
I L
I
OZH
I
OZL
V
IK
I
ODH
I
ODL
V
OH
Parameter
Input HIGH Level (Input pins)
Input HIGH Level (I/O pins)
Input LOW Level
(Input and I/O pins)
Input HIGH Current (Input pins)
(6)
Input HIGH Current (I/O pins)
(6)
Input LOW Current (Input pins)
(6)
Input LOW Current (I/O pins)
(6)
High Impedance Output Current
(3-State Output pins)
(6)
Clamp Diode Voltage
Output HIGH Current
Output LOW Current
Output HIGH Voltage
V
CC
= Max.
V
CC
= Max.
V
I
= 5.5V
V
I
= V
CC
V
I
= GND
V
I
= GND
V
O
= V
CC
V
O
= GND
V
CC
= Min., I
IN
= –18mA
V
CC
= 3.3V, V
IN
= V
IH
or V
IL,
V
O
= 1.5V
(3)
V
CC
= 3.3V, V
IN
= V
IH
or V
IL,
V
O
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= 3.0V
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –0.1mA
I
OH
= –3mA
I
OH
= –6mA MIL.
I
OH
= –8mA COM'L.
I
OL
= 0.1mA
I
OL
= 16mA
I
OL
= 24mA
V
CC
= 3.0V
I
OL
= 24mA
V
IN
= V
IH
or V
IL
V
CC
= Max., V
O
= GND
(3)
—
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Min.
2.0
2.0
–0.5
—
—
—
—
—
—
—
–36
50
V
CC
–
0.2
2.4
2.4
(5)
—
—
—
—
–60
—
—
—
Typ.
(2)
—
—
—
Max.
5.5
V
CC
+0.5
0.8
±1
±1
±1
±1
±1
±1
–
1.2
Unit
V
V
µA
—
—
—
—
—
—
–
0.7
µA
V
mA
mA
V
–60
90
—
3.0
3.0
—
0.2
0.3
0.3
–
135
–110
200
—
—
—
0.2
0.4
0.55
0.50
–240
—
V
OL
Output LOW Voltage
V
I
OS
V
H
I
CCL
I
CCH
I
CCZ
Short Circuit Current
(4)
Input Hysteresis
Quiescent Power Supply Current
mA
mV
µA
150
0.1
0.1
V
CC
= Max.,
V
IN
= GND or V
CC
COM'L.
MIL.
10
100
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 = 3.3V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not tested.
5. V
OH
= V
CC
–0.6V at rated current.
6. The test limits for this parameter is
±
5µA at T
A
= –55°C.
2650 lnk 05
8.12
3
IDT54/74FCT3245/A
3.3V CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Dynamic Power Supply
Current
(4)
V
CC
= Max.
Test Conditions
(1)
V
IN
= V
CC
– 0.6V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
—
—
Typ.
(2)
2.0
60
Max.
30
85
Unit
µA
µA/
MHz
V
CC
= Max.
Outputs Open
OE
= DIR = GND
One Input Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fi =10MHz
50% Duty Cycle
I
C
Total Power Supply Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
–0.6V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
–0.6V
V
IN
= GND
—
0.6
0.9
mA
—
0.6
0.9
OE
= DIR = GND
One Bit Toggling
V
CC
= Max.
Outputs Open
fi = 2.5MHz
50% Duty Cycle
OE
= DIR = GND
Eight Bits Toggling
—
1.2
1.7
(5)
—
1.2
1.8
(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 V
CC
= 3.3V, +25°C ambient.
3. Per TTL driven input; 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
N
CP
/2 + fiNi)
I
CC
= Quiescent Current (I
CCL,
I
CCH
and I
CCZ
)
∆I
CC
= Power Supply Current for a TTL High Input
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)
N
CP
= Number of Clock Inputs at f
CP
f
i
= Input Frequency
N
i
= Number of Inputs at fi
2650 tbl 06
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
(3)
FCT3245
Com'l.
Symbol
Parameter
Condition
(1)
Min.
(2)
Max.
Mil.
Min.
(2)
Max.
Com'l.
Min.
(2)
Max.
FCT3245A
Mil.
Min.
(2)
Max.
Unit
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A to B, B to A
Output Enable Time
OE
to A or B
Output Disable Time
OE
to A or B
Output Enable Time
DIR to A or B
(4)
Output Disable Time
DIR to A or B
(4)
C
L
= 50pF
R
L
= 500Ω
1.5
1.5
1.5
1.5
1.5
7.0
9.5
7.5
9.5
7.5
1.5
1.5
1.5
1.5
1.5
7.5
10.0
10.0
10.0
10.0
1.5
1.5
1.5
1.5
1.5
4.6
6.2
5.0
6.2
5.0
1.5
1.5
1.5
1.5
1.5
4.9
6.5
6.0
6.5
6.0
ns
ns
ns
ns
ns
2650 tbl 07
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. Propagation Delays and Enable/Disable times are with V
CC
= 3.3V
±0.3V,
Normal Range. For V
CC
= 2.7V to 3.6V, Extended Range, all Propagation Delays
and Enable/Disable times should be degraded by 20%.
4. This parameter is guaranteed but not tested.
8.12
4
IDT54/74FCT3245/A
3.3V CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
6V
V
CC
SWITCH POSITION
Open
GND
500
Ω
V
Pulse
Generator
R
T
IN
V
D.U.T.
OUT
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other tests
Switch
6V
50pF
C
L
500
Ω
SET-UP, HOLD AND RELEASE TIMES
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
t
SU
t
H
t
REM
t
SU
t
H
PROPAGATION DELAY
3V
1.5V
0V
V
OH
1.5V
V
OL
3V
1.5V
0V
2650 drw 07
SAME PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
OPPOSITE PHASE
INPUT TRANSITION
t
PHL
t
PHL
←
GND
Open
2650 lnk 08
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
=
Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
2650 drw 04
PULSE WIDTH
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
2650 drw 05
LOW-HIGH-LOW
PULSE
t
W
HIGH-LOW-HIGH
PULSE
1.5V
1.5V
2650 drw 06
ENABLE AND DISABLE TIMES
ENABLE
CONTROL
INPUT
t
PZL
OUTPUT
NORMALLY SWITCH
6V
LOW
t
PZH
OUTPUT
NORMALLY
HIGH
SWITCH
GND
3V
1.5V
t
PHZ
0.3V
1.5V
0V
V
OH
0V
t
PLZ
DISABLE
3V
1.5V
0V
3V
0.3V
V
OL
2650 drw 08
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.
3. If V
CC
is below 3V, input voltage swings should be adjusted not to exceed
V
CC
.
8.12
5
