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
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
