Document
www.DataSheet4U.com
FXL2TD245 Low Voltage Dual Supply 2-Bit Signal Translator with Configurable Voltage Supplies and Signal Levels and 3-STATE Outputs and Independent Direction Controls
November 2006
FXL2TD245
Low Voltage Dual Supply 2-Bit Signal Translator with Configurable Voltage Supplies and Signal Levels and 3-STATE Outputs and Independent Direction Controls
General Description
The FXL2TD245 is a configurable dual-voltage-supply translator designed for both uni-directional and bi-directional voltage translation between two logic levels. 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 inputs independently determine the direction of data through each of the two bits. The OE input, when HIGH, disables both the A and B Ports by placing them in a 3-STATE condition. The FXL2TD245 is designed so that the control pins (T/R and OE) are supplied by VCCA.
tm
Features
■ Bi-directional interface between any 2 levels
from 1.1V to 3.6V
■ Fully 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 ■ Control inputs (T/Rn, OE) levels are referenced to
VCCA voltage
■ Packaged in the Chipscale MicroPak10
(1.6mm x 2.1mm)
■ 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)
Ordering Information
Order Number
FXL2TD245L10X
Package Number
MAC010A
Pb-Free
Yes
Package Description
10-Lead MicroPak, 1.6mm x 2.1mm
Pb-Free package per JEDEC J-STD-020B.
©2005 Fairchild Semiconductor Corporation FXL2TD245 Rev. 1.0.4
www.fairchildsemi.com 1
FXL2TD245 Low Voltage Dual Supply 2-Bit Signal Translator with Configurable Voltage Supplies and Signal Levels and 3-STATE Outputs and Independent Direction Controls
Functional Diagram
VCCA OE A0 B0 T/R0 A1 B1 T/R1 VCCB
Pin Descriptions
Pin Names
OE T/Rn An Bn VCCA VCCB
Description
Output Enable Input Transmit/Receive Inputs Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs Side A Power Supply Side B Power Supply
Truth Table
Inputs OE T/R0 T/R1
L L L L H B0
9
Outputs
B0 Data to A0 Output A0 Data to B0 Output B1 Data to A1 Output A1 Data to B1 Output 3-STATE
L H X X X
X X L H X
Connection Diagram
B1
8
OE
7
T/R1
6
H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
VCCB
10
5
GND
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 0 volts, outputs are in a HIGH-Impedance state. The control inputs (T/Rn and OE) are designed to track the VCCA supply. A pull-up resistor tying OE to VCCA should be used to ensure that bus contention, excessive currents, or oscillations do not occur during power-up/power-down. The size of the pullup resistor is based upon the current-sinking capability of the OE driver. The recommended power-up sequence is the following: 1. Apply power to either VCC. 2. Apply power to the T/Rn inputs (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. 4. Drive the OE input LOW to enable the device. The recommended power-down sequence is the following: 1. Drive OE input HIGH to disable the device. 2. Remove power from either VCC. 3. Remove power from other VCC.
1
2
3
4
VCCA
A0
A1
T/R0
(Top View)
Pin Assignment
Pin Number
1 2 3 4 5 6 7 8 9 10
Terminal Name
VCCA A0 A1 T/R0 GND T/R1 OE B1 B0 VCCB
©2005 Fairchild Semiconductor Corporation FXL2TD245 Rev. 1.0.4
www.fairchildsemi.com 2
FXL2TD245 Low Voltage Dual Supply 2-Bit Signal Translator with Configurable Voltage Supplies and Signal Levels and 3-STATE Outputs and Independent Direction Controls
Absolute Maximum Ratings
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Symbol
VCCA, VCCB VI Supply Voltage
Parameter
DC Input Voltage I/O Port A I/O Port B Control Inputs (T/Rn, OE) Output Voltage(1.