FAST CMOS 16-BIT
BIDIRECTIONAL
3.3V TO 5V TRANSLATOR
Integrated Device Technology, Inc.
IDT54/74FCT164245T
FEATURES:
• 0.5 MICRON CMOS Technology
• Bidirectional interface between 3.3V and 5V busses
• Control inputs can be driven from either 3.3V
or 5V circuits
• ESD >2000V per MIL-STD-883, Method 3015;
>200V using machine model (C = 200pF, R = 0)
• 25 MIL Center SSOP and Cerpack Packages
• Extended commercial range of -40°C to +85°C
• V
CC1
= 5V
±10%,
V
CC2
= 2.7V to 3.6V
• High drive outputs (-32mA I
OH
, 64mA I
OL
) on 5V port
• Power-off disable on both ports permits "live insertion"
• Typical V
OLP
(Output Ground Bounce) < 0.9V at
V
CC1
= 5V, V
CC2
= 3.3V, T
A
= 25°C
DESCRIPTION:
The FCT164245T 16-bit 3.3V-to-5V translator is built
using advanced dual metal CMOS technology. This high-
speed, low-power transceiver is designed to interface be-
tween a 3.3V bus and a 5V bus in a mixed 3.3V/5V supply
environment. This enables system designers to interface TTL
compatible 3.3V components with 5V components. The
direction and output enable controls operate these devices as
either two independent 8-bit transceivers or one 16-bit trans-
ceiver. The A port interfaces with the 3.3V bus; the B port
interfaces with the 5V bus. The direction control (xDIR) pin
controls the direction of data flow. The output enable (x
OE
)
overrides the direction control and disables both ports. These
control signals can be driven from either 3.3V or 5V devices.
The FCT164245T is ideally suited for driving high capaci-
tance loads and low impedance backplanes. The output
buffers are designed with Power-Off Disable capability to
allow "hot insertion" of boards when used as backplane
drivers. They also allow interface between a mixed supply
system and external 5V peripherals.
FUNCTIONAL BLOCK DIAGRAM
1
DIR
1
OE
1
A
1
1
B
1
1
A
2
1
B
2
1
A
3
1
B
3
2
DIR
2
OE
2
A
1
2
B
1
2
A
2
2
B
2
2
A
3
2
B
3
3.3V PORT
5V PORT
1
B
4
1
A
5
1
B
5
1
A
6
1
B
6
1
A
7
1
B
7
1
A
8
1
B
8
2555 drw 01
2
B
4
2
A
5
2
B
5
2
A
6
2
B
6
2
A
7
2
B
7
2
A
8
2
B
8
2555 drw 02
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996
IIntegrated Device Technology, Inc.
FEBRUARY 1996
DSC-2555/4
8.16
1
5V PORT
1
A
4
3.3V PORT
2
A
4
IDT54/74FCT164245T
FAST CMOS 16-BIT BIDIRECTIONAL 3.3V-TO-5V TRANSLATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATIONS
1
DIR
1
B
1
1
B
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
SO48-1 37
SO48-2
36
35
34
33
32
31
30
29
28
27
26
25
1
OE
1
A
1
1
A
2
1
DIR
1
B
1
1
B
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
E48-1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
2555 drw 04
1
OE
1
A
1
1
A
2
GND
1
B
3
1
B
4
GND
1
A
3
1
A
4
GND
1
B
3
1
B
4
GND
1
A
3
1
A
4
V
CC1
1
B
5
1
B
6
V
CC2
1
A
5
1
A
6
V
CC1
1
B
5
1
B
6
V
CC2
1
A
5
1
A
6
GND
1
B
7
1
B
8
2
B
1
2
B
2
GND
1
A
7
1
A
8
2
A
1
2
A
2
GND
1
B
7
1
B
8
2
B
1
2
B
2
GND
1
A
7
1
A
8
2
A
1
2
A
2
GND
2
B
3
2
B
4
GND
2
A
3
2
A
4
GND
2
B
3
2
B
4
GND
2
A
3
2
A
4
V
CC1
2
B
5
2
B
6
V
CC2
2
A
5
2
A
6
V
CC1
2
B
5
2
B
6
V
CC2
2
A
5
2
A
6
GND
2
B
7
2
B
8
2
DIR
GND
2
A
7
2
A
8
2
OE
GND
2
B
7
2
B
8
2
DIR
2555 drw 03
GND
2
A
7
2
A
8
2
OE
SSOP
TSSOP
TOP VIEW
CERPACK
TOP VIEW
POWER SUPPLY SEQUENCING
In the IDT54/74FCT164245T the condition of V
CC1
≥
(V
CC2
–0.5V) must be maintained at all times. For the range
of V
CC1
= (V
CC2
–0.5V) to V
CC1
= (V
CC2
+0.9V), both the A
and B ports will remain in a high impedance state.
8.16
2
IDT54/74FCT164245T
FAST CMOS 16-BIT BIDIRECTIONAL 3.3V-TO-5V TRANSLATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names
x
OE
xDIR
xAx
xBx
Description
Output Enable Input (Active LOW)
Direction Control Input
Side A Inputs or 3-State Outputs (3.3V Port)
Side B Inputs or 3-State Outputs (5V Port)
2555 tbl 01
FUNCTION TABLE
(1)
Inputs
x
OE
L
L
H
xDIR
L
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
2555 tbl 03
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High Impedance
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Rating
V
TERM(2)
Terminal Voltage
with Respect to
GND
V
TERM(3)
Terminal Voltage
with Respect to
GND
T
A
Operating
Temperature
T
BIAS
Temperature
Under Bias
T
STG
Storage
Temperature
P
T
Power Dissipation
I
OUT
DC Output
Current
Commercial
–0.5 to +7.0
Military
–0.5 to +7.0
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
3.5
Max. Unit
6.0
pF
8.0
pF
–0.5 to V
CC1
+0.5
–40 to +85
–55 to +125
–55 to +125
1.0
–60 to +120
–0.5 to V
CC1
+0.5
–55 to +125
–65 to +135
–65 to +150
1.0
–60 to +120
V
°C
°C
°C
W
mA
2555 lnk 04
NOTE:
1. This parameter is measured at characterization but not tested.
2555 lnk 02
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 ex-
tended periods may affect reliability.
2. All device terminals except V
CC2.
3. Power supply terminals V
CC2.
8.16
3
IDT54/74FCT164245T
FAST CMOS 16-BIT BIDIRECTIONAL 3.3V-TO-5V TRANSLATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (A PORT - 3.3V)
Following Conditions Apply Unless Otherwise Specified:
V
CC1
= 5V
±
10%, V
CC2
= 2.7V to 3.6V; Commercial: T
A
= –40°C to +85°C, Military: T
A
= –55°C to +125°C,
Symbol
V
IH
V
IL
I
I H
I
I L
V
IK
V
OH
Parameter
Input HIGH Level
(Input and I/O pins)
Input LOW Level
(Input and I/O pins)
Input HIGH Current (Input pins)
Input HIGH Current (I/O pins)
Input LOW Current (Input pins)
Input LOW Current (I/O pins)
Clamp Diode Voltage
Output HIGH Voltage
V
CC1
= V
CC2
= Min.
V
IN
= V
IH
or V
IL
V
CC2
= 3.0V
V
IN
= V
IH
or V
IL
V
CC1
= Min.
V
CC2
= Min.
V
IN
= V
IH
or V
IL
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC1
= Max.
V
CC2
= Max.
V
I
= 5.5V
V
I
= V
CC2
V
I
= GND
V
I
= GND
V
CC2
= Min., I
IN
= –18mA
I
OH
= –0.1mA
I
OH
= –3mA MIL.
I
OH
= –6mA MIL.
I
OH
= –8mA COM'L.
I
OL
= 0.1mA
I
OL
= 16mA
I
OL
= 24mA
Min.
2.0
–0.5
—
—
—
—
—
V
CC2
–0.2
2.4
2.4
—
—
—
—
—
–70
–40
—
—
Typ.
(2)
—
—
—
—
—
—
–
0.7
Max.
5.5
0.8
Unit
V
V
±
5
±
15
±
5
±
15
–
1.2
µ
A
V
V
—
3.0
3.0
—
0.2
0.3
0.3
—
–105
–60
150
0.35
—
—
—
0.2
0.4
0.55
0.50
V
OL
Output LOW Voltage
V
I
OFF
I
OS
I
O
V
H
I
CC2L
I
CC2H
I
CC2Z
Input/Output Power Off Leakage
Short Circuit Current
(4)
Output Drive Current
Input Hysteresis
Quiescent Power Supply Current
V
CC
= 3.0V
I
OL
= 24mA
V
IN
= V
IH
or V
IL
V
CC1
= 0V, V
CC2
= 0V, V
IN
or V
O
≤
4.5V
V
CC1
= Max., V
CC2
= Max., V
O
= GND
(3)
V
CC1
= Max., V
CC2
= Max., V
O
= 1.5V
(3)
—
±
100
–150
–90
—
µ
A
mA
mA
mV
mA
V
CC1
= Max., V
IN
= GND or V
CC2
V
CC2
= Max.
2.0
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
CC1
= 5.0V, V
CC2
= 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.
2555 tbl 05
8.16
4
IDT54/74FCT164245T
FAST CMOS 16-BIT BIDIRECTIONAL 3.3V-TO-5V TRANSLATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (B PORT - 5V)
Following Conditions Apply Unless Otherwise Specified:
V
CC1
= 5V
±
10%, V
CC2
= 2.7V to 3.6V; Commercial: T
A
= –40°C to +85°C, Military: T
A
= –55°C to +125°C,
Symbol
V
IH
V
IL
I
I H
I
I L
V
IK
V
OH
Parameter
Input HIGH Level
(Input and I/O pins)
Input LOW Level
(Input and I/O pins)
Input HIGH Current (Input pins)
Input HIGH Current (I/O pins)
Input LOW Current (Input pins)
Input LOW Current (I/O pins)
Clamp Diode Voltage
Output HIGH Voltage
V
CC1
= Min., I
IN
= –18mA
V
CC1
= Min.
V
CC2
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –3mA
I
OH
= –12mA MIL.
I
OH
= –15mA COM'L.
I
OH
= –24mA MIL.
I
OH
= –32mA COM'L.
(5)
I
OL
= 48mA MIL.
I
OL
= 64mA COM'L.
2.0
—
3.0
0.2
—
0.55
V
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC1
= Max.
V
CC2
= Max.
V
I
= GND
V
I
= V
CC1
Min.
2.0
–0.5
—
—
—
—
—
2.5
2.4
Typ.
(2)
—
—
—
—
—
—
–
0.7
Max.
5.5
0.8
±5
±15
±5
±15
–
1.2
Unit
V
V
µA
V
V
3.5
3.5
—
—
V
OL
Output LOW Voltage
I
OFF
I
OS
I
O
V
H
I
CC1L
I
CC1H
I
CC1Z
Input/Output Power Off Leakage
Short Circuit Current
(4)
Output Drive Current
Input Hysteresis
Quiescent Power Supply Current
V
CC1
= Min.,
V
CC2
= Min.
V
IN
= V
IH
or V
IL
V
CC1
= 0V, V
CC2
= 0V, V
IN
or V
O
≤
4.5V
—
–80
–50
—
—
—
–
140
±100
–
225
–
180
—
µA
mA
mA
mV
mA
V
CC1
= Max., V
CC2
= Max., V
O
= GND
(3)
V
CC1
= Max., V
CC2
= Max., V
O
= 2.5V
(3)
—
–75
150
0.08
V
CC1
= Max., V
IN
= GND or V
CC2
V
CC2
= Max.
1.5
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
CC1
= 5.0V, V
CC2
= 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 Duration of the condition can not exceed one second.
2555 tbl 06
8.16
5
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