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Fairchild Semiconductor Electronic Components Datasheet

FXLH1T45 Datasheet

Low Voltage 1-Bit Bi-directional Level Translator

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April 2007
FXLH1T45
Low Voltage 1-Bit Bi-directional Level Translator with
tm
Configurable Voltage Supplies and Bushold Data Inputs
Features
Bi-directional interface between any 2 levels from 1.1V
to 3.6V
www.DataSheet4U.comFully configurable: Inputs track VCC level
Non-preferential power-up sequencing; either VCC
may be powered-up first
Outputs remain in 3-STATE until active VCC level is
reached
Outputs switch to 3-STATE if either VCC is at GND
Power off protection
Bushold on data inputs eliminates the need for
external pull-up/pull-down resistors
Control input (T/R) levels are referenced to VCCA
voltage
Packaged in the MicroPak 6 (1.0mm x 1.45mm)
ESD protections exceeds:
– 4kV HBM ESD
(per JESD22-A114 & Mil Std 883e 3015.7)
– 8kV HBM I/O to GND ESD
(per JESD22-A114 & Mil Std 883e 3015.7)
– 1kV CDM ESD (per ESD STM 5.3)
– 200V MM ESD (per JESD22-A115 & ESD STM5.2)
General Description
The FXLH1T45 is a single bit configurable dual-voltage
supply translator designed for both uni-directional and
bi-directional voltage translation between two logic lev-
els. The device allows translation between voltages as
high as 3.6V to as low as 1.1V. The A port tracks the
VCCA level, and the B port tracks the VCCB level. This
allows for bi-directional voltage translation over a variety
of voltage levels: 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V.
The device remains in 3-STATE until both VCCs reach
active levels allowing either VCC to be powered-up first.
Internal power down control circuits place the device in
3-STATE if either VCC is removed.
The Transmit/Receive (T/R) input determines the direc-
tion of data flow through the device. The FXLH1T45 is
designed so that the control pin (T/R) is supplied by
VCCA.
Ordering Information
Order Number
FXLH1T45L6X
Package
Number
MAC06A
Pb-Free
Yes
Package Description
Supplied As
6-Lead MicroPak, 1.0mm Wide 5k Units on Tape and Reel
MicroPak™ is a trademark of Fairchild Semiconductor Corporation.
©2006 Fairchild Semiconductor Corporation
FXLH1T45 Rev. 1.0.4
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FXLH1T45 Datasheet

Low Voltage 1-Bit Bi-directional Level Translator

No Preview Available !

Functional Diagram
VCCA
A
VCCB
T/R
B
Connection Diagram
www.DataSheet4U.com
VCCA 1
6 VCCB
GND 2
5 T/R
A3
4B
(Top Through View)
Pin Assignment
Pin Number
1
2
3
4
5
6
Terminal Name
VCCA
GND
A
B
T/R
VCCB
Pin Descriptions
Pin Names
Description
T/R Transmit/Receive Input
A Side A Input or Output
B Side B Input or Output
VCCA
VCCB
Side A Power Supply
Side B Power Supply
Function Table
Inputs (T/R)
L
H
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
H = HIGH Logic Level
L = LOW Logic Level
Power-Up/Power-Down Sequencing
FXL translators offer an advantage in that either VCC
may be powered up first. This benefit derives from the
chip design. When either VCC is at 0V, outputs are in a
HIGH-Impedance state. To ensure that bus contention,
excessive currents, or oscillations do not occur, a proper
power-up sequence is recommended.
The recommended power-up sequence is the following:
1. Apply power to either VCC.
2. Apply power to the T/R input (Logic HIGH for A-to-B
operation; Logic LOW for B-to-A operation) and to the
respective data inputs (A Port or B Port). This may
occur at the same time as Step 1.
3. Apply power to other VCC.
The recommended power-down sequence is the follow-
ing:
1. Remove power from either VCC.
2. Remove power from other VCC.
©2006 Fairchild Semiconductor Corporation
FXLH1T45 Rev. 1.0.4
2
www.fairchildsemi.com


Part Number FXLH1T45
Description Low Voltage 1-Bit Bi-directional Level Translator
Maker Fairchild Semiconductor
Total Page 11 Pages
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