1996 IIntegrated Device Technology, Inc.
8.16
DSC-2555/4
Integrated Device Technology, Inc.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
IDT54/74FCT164245T
FAST CMOS 16-BIT
BIDIRECTIONAL
3.3V TO 5V TRANSLATOR
1
DIR
1
OE
1
A
1
1
A
2
1
A
3
1
A
4
1
A
5
1
A
6
1
A
7
1
A
8
1
B
1
1
B
2
1
B
3
1
B
4
1
B
5
1
B
6
1
B
7
1
B
8
2555 drw 01
3.3V PORT
5V PORT
2
DIR
2
OE
2
A
1
2
A
2
2
A
3
2
A
4
2
A
5
2
A
6
2
A
7
2
A
8
2
B
1
2
B
2
2
B
3
2
B
4
2
B
5
2
B
6
2
B
7
2
B
8
2555 drw 02
3.3V PORT
5V PORT
1
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FEBRUARY 1996
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
8.16
2
IDT54/74FCT164245T
FAST CMOS 16-BIT BIDIRECTIONAL 3.3V-TO-5V TRANSLATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATIONS
1
DIR
1
B
1
GND
1
B
3
V
CC1
GND
2
B
2
GND
V
CC1
GND
1
B
2
1
B
4
1
B
5
1
B
6
1
B
7
1
B
8
2
B
1
2
B
3
2
B
4
2
B
5
2
B
7
2
B
8
2
B
6
2
DIR
1
A
1
1
A
2
GND
1
A
3
1
A
4
V
CC2
1
A
5
1
A
6
1
A
7
1
A
8
2
A
1
2
A
2
2
A
3
2
A
4
V
CC2
2
A
5
2
A
7
2
A
8
2
A
6
GND
GND
GND
2
OE
1
OE
39
29
30
31
32
33
34
35
36
37
38
25
26
27
28
48
47
41
42
43
44
45
46
40
1
2
3
4
5
6
7
8
9
10
12
13
14
15
16
17
18
19
20
11
21
22
23
24
2555 drw 04
CERPACK
TOP VIEW
E48-1
1
DIR
1
B
1
GND
1
B
3
V
CC1
GND
2
B
2
GND
V
CC1
GND
1
B
2
1
B
4
1
B
5
1
B
6
1
B
7
1
B
8
2
B
1
2
B
3
2
B
4
2
B
5
2
B
7
2
B
8
2
B
6
2
DIR
1
A
1
1
A
2
GND
1
A
3
1
A
4
V
CC2
1
A
5
1
A
6
1
A
7
1
A
8
2
A
1
2
A
2
2
A
3
2
A
4
V
CC2
2
A
5
2
A
7
2
A
8
2
A
6
GND
GND
GND
2
OE
1
OE
2555 drw 03
39
29
30
31
32
33
34
35
36
37
38
25
26
27
28
48
47
41
42
43
44
45
46
40
1
2
3
4
5
6
7
8
9
10
12
13
14
15
16
17
18
19
20
11
21
22
23
24
SSOP
TSSOP
TOP VIEW
SO48-1
SO48-2
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
3
IDT54/74FCT164245T
FAST CMOS 16-BIT BIDIRECTIONAL 3.3V-TO-5V TRANSLATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FUNCTION TABLE
(1)
Inputs
x
OE
OE
xDIR
Outputs
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
High Z State
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High Impedance
2555 tbl 03
PIN DESCRIPTION
CAPACITANCE
(T
A
= +25
C, f = 1.0MHz)
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Rating
Commercial
Military
Unit
V
TERM(2)
Terminal Voltage
with Respect to
GND
0.5 to +7.0
0.5 to +7.0
V
V
TERM(3)
Terminal Voltage
with Respect to
GND
0.5 to V
CC1
+0.5
0.5 to V
CC1
+0.5
V
T
A
Operating
Temperature
40 to +85
55 to +125
C
T
BIAS
Temperature
Under Bias
55 to +125
65 to +135
C
T
STG
Storage
Temperature
55 to +125
65 to +150
C
P
T
Power Dissipation
1.0
1.0
W
I
OUT
DC Output
Current
60 to +120 60 to +120 mA
2555 lnk 02
2555 tbl 01
NOTE:
1. This parameter is measured at characterization but not tested.
2555 lnk 04
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.
Symbol
Parameter
(1)
Conditions
Typ.
Max.
Unit
C
IN
Input
Capacitance
V
IN
= 0V
3.5
6.0
pF
C
I/O
I/O
Capacitance
V
OUT
= 0V
3.5
8.0
pF
Pin Names
Description
x
OE
Output Enable Input (Active LOW)
xDIR
Direction Control Input
xAx
Side A Inputs or 3-State Outputs (3.3V Port)
xBx
Side B Inputs or 3-State Outputs (5V Port)
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 (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
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
IH
Input HIGH Level
(Input and I/O pins)
Guaranteed Logic HIGH Level
2.0
--
5.5
V
V
IL
Input LOW Level
(Input and I/O pins)
Guaranteed Logic LOW Level
0.5
--
0.8
V
I
I H
Input HIGH Current (Input pins)
V
CC1
= Max.
V
I
= 5.5V
--
--
5
A
Input HIGH Current (I/O pins)
V
CC2
= Max.
V
I
= V
CC2
--
--
15
I
I L
Input LOW Current (Input pins)
V
I
= GND
--
--
5
Input LOW Current (I/O pins)
V
I
= GND
--
--
15
V
IK
Clamp Diode Voltage
V
CC2
= Min., I
IN
= 18mA
--
0.7
1.2
V
V
OH
Output HIGH Voltage
V
CC1
= V
CC2
= Min.
I
OH
= 0.1mA
V
CC2
0.2
--
--
V
V
IN
= V
IH
or V
IL
I
OH
= 3mA MIL.
2.4
3.0
--
V
CC2
= 3.0V
V
IN
= V
IH
or V
IL
I
OH
= 6mA MIL.
I
OH
= 8mA COM'L.
2.4
3.0
--
V
OL
Output LOW Voltage
V
CC1
= Min.
I
OL
= 0.1mA
--
--
0.2
V
V
CC2
= Min.
I
OL
= 16mA
--
0.2
0.4
V
IN
= V
IH
or V
IL
I
OL
= 24mA
--
0.3
0.55
V
CC
= 3.0V
V
IN
= V
IH
or V
IL
I
OL
= 24mA
--
0.3
0.50
I
OFF
Input/Output Power Off Leakage
V
CC1
= 0V,
V
CC2
= 0V, V
IN
or V
O
4.5V
--
--
100
A
I
OS
Short Circuit Current
(4)
V
CC1
= Max., V
CC2
= Max., V
O
= GND
(3)
70
105
150
mA
I
O
Output Drive Current
V
CC1
= Max., V
CC2
= Max., V
O
= 1.5V
(3)
40
60
90
mA
V
H
Input Hysteresis
--
--
150
--
mV
I
CC2L
I
CC2H
I
CC2Z
Quiescent Power Supply Current
V
CC1
= Max., V
IN
= GND or V
CC2
V
CC2
= Max.
--
0.35
2.0
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
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
5
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
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
IH
Input HIGH Level
(Input and I/O pins)
Guaranteed Logic HIGH Level
2.0
--
5.5
V
V
IL
Input LOW Level
(Input and I/O pins)
Guaranteed Logic LOW Level
0.5
--
0.8
V
I
I H
Input HIGH Current (Input pins)
V
CC1
= Max.
V
I
= V
CC1
--
--
5
A
Input HIGH Current (I/O pins)
V
CC2
= Max.
--
--
15
I
I L
Input LOW Current (Input pins)
V
I
= GND
--
--
5
Input LOW Current (I/O pins)
--
--
15
V
IK
Clamp Diode Voltage
V
CC1
= Min., I
IN
= 18mA
--
0.7
1.2
V
V
OH
Output HIGH Voltage
V
CC1
= Min.
I
OH
= 3mA
2.5
3.5
--
V
V
CC2
= Min.
I
OH
= 12mA MIL.
2.4
3.5
--
V
IN
= V
IH
or V
IL
I
OH
= 15mA COM'L.
I
OH
= 24mA MIL.
I
OH
= 32mA COM'L.
(5)
2.0
3.0
--
V
OL
Output LOW Voltage
V
CC1
= Min.,
V
CC2
= Min.
V
IN
= V
IH
or V
IL
I
OL
= 48mA MIL.
I
OL
= 64mA COM'L.
--
0.2
0.55
V
I
OFF
Input/Output Power Off Leakage
V
CC1
= 0V, V
CC2
= 0V, V
IN
or V
O
4.5V
--
--
100
A
I
OS
Short Circuit Current
(4)
V
CC1
= Max., V
CC2
= Max., V
O
= GND
(3)
80
140
225
mA
I
O
Output Drive Current
V
CC1
= Max., V
CC2
= Max., V
O
= 2.5V
(3)
50
75
180
mA
V
H
Input Hysteresis
--
--
150
--
mV
I
CC1L
I
CC1H
I
CC1Z
Quiescent Power Supply Current
V
CC1
= Max., V
IN
= GND or V
CC2
V
CC2
= Max.
--
0.08
1.5
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
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
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