TXB0302 Datasheet, PDF (1/11 Pages) Texas Instruments – 2-Bit Bidirectional Voltage-Level Translator with Automatic Direction Sensing

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TXB0302
SCES837A – MARCH 2012 – REVISED MAY 2012
2-Bit Bidirectional Voltage-Level Translator with Automatic Direction Sensing
Check for Samples: TXB0302
FEATURES
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• Fully Symmetric Supply Voltages.
0.9 V to 3.6 V on A Port and 0.9 V to 3.6 V
• V_CC Isolation Feature — If Either V_CC Input Is at
GND, All Outputs Are in the High-Impedance
State
• OE Input Circuit Referenced to V_CCA
• Low Power Consumption, 5-µA Max I_CC
• Ioff Supports Partial-Power-Down Mode
Operation
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
• ESD Protection Exceeds JESD 22
– 4000-V Human-Body Model (A114-B)
– 1000-V Charged-Device Model (C101)
DESCRIPTION
This 2-bit noninverting translator uses two separate
configurable power-supply rails. The A port is
designed to track VCCA. VCCA accepts any supply
voltage from 0.9 V to 3.6 V. The B port is designed to
track VCCB. VCCB accepts any supply voltage from
0.9 V to 3.6 V. This allows for low-voltage
bidirectional translation between 1-V, 1.2-V, 1.5-V,
1.8-V, 2.5-V and 3.3-V voltage nodes. For the
TXB0302, when the output-enable (OE) input is low,
all outputs are placed in the high-impedance state. To
ensure the high-impedance state during power up or
power down, OE should be tied to GND through a
pulldown resistor; the minimum value of the resistor is
determined by the current-sourcing capability of the
driver. The TXB0302 is designed so that the OE input
circuit is supplied by VCCA. This device is fully
specified for partial-power-down applications using
I_off. The I_off circuitry disables the outputs, preventing
damaging current backflow through the device when
it is powered down.
DQM PACKAGE
(TOP VIEW)
V_CCA 1
A1 ²
A2 ³
GND ⁴
8 _VCCB
7 _B1
6 B2
5 _OE
A. Pull up resistors are not required on both sides for Logic I/O.
B. If pull up or pull down resistors are needed, the resistor value must be over 20 kΩ.
C. 20 kΩ is a safe recommended value, if the customer can accept higher Vol or lower Voh, smaller pull up or pull down
resistor is allowed, the draft estimation is Vol = Vccout × 1.5k/(1.5k + Rpu) and Voh = Vccout × Rdw/(1.5k + Rdw).
D. If pull up resistors are needed, please refer to the TXS0102 or contact TI.
E. For detailed information, please refer to application note SCEA043.
T_A
–40°C to 85°C
ORDERING INFORMATION⁽¹⁾
PACKAGE ⁽²⁾
ORDERABLE PART NUMBER
DQM – MicroQFN
TXB0302DQMR
TOP-SIDE MARKING
77A
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated