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GXY OR ZXY PACKAGE

(BOTTOM VIEW)

21 3 4 5

PW PACKAGE

(TOP VIEW)

RGY PACKAGE

(TOP VIEW)

1 20

10 11

CCB

CCA

GND

CCB

GND

CCA

CCB

GND

CCA

DQS PACKAGE

(TOP VIEW)

TXB0108

www.ti.com

SCES643B –NOVEMBER 2006–REVISED FEBRUARY 2010

8-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR

WITH AUTO-DIRECTION SENSING AND ±15-kV ESD PROTECTION

Check for Samples: TXB0108

FEATURES

• 1.2 V to 3.6 V on A Port and 1.65 to 5.5 V on

B Port (V

CCA

≤ V

CCB

)

• V

Isolation Feature – If Either V

Input Is at

GND, All Outputs Are in the High-Impedance

State

• OE Input Circuit Referenced to V

CCA

• Low Power Consumption, 4-mA Max I

• I

off

Supports Partial-Power-Down Mode

Operation

• Latch-Up Performance Exceeds 100 mA Per

TERMINAL ASSIGNMENTS

JESD 78, Class II

(20-Ball GXY/ZXY Package)

• ESD Protection Exceeds JESD 22

1 2 3 4 5

– A Port

D V

CCB

B2 B4 B6 B8

– 2000-V Human-Body Model (A114-B)

C B1 B3 B5 B7 GND

– 1000-V Charged-Device Model (C101)

B A1 A3 A5 A7 OE

A V

CCA

A2 A4 A6 A8

– B Port

– ±15-kV Human-Body Model (A114-B)

– 1000-V Charged-Device Model (C101)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of 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.

Summary of content (31 pages)

PAGE 1
TXB0108 www.ti.
PAGE 2
TXB0108 SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 www.ti.com DESCRIPTION/ORDERING INFORMATION This 8-bit noninverting translator uses two separate configurable power-supply rails. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.65 V to 5.5 V. This allows for universal low-voltage bidirectional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V voltage nodes.
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TXB0108 www.ti.com SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 TYPICAL OPERATING CIRCUIT 1.8 V 3.3 V VCCA VCCB OE TXB0108 1.8 -V System Controller Data A1 A2 B1 B2 A3 A4 A5 A6 A7 A8 B3 B4 B5 B6 B7 B8 3.3-V System Data Absolute Maximum Ratings (1) over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT VCCA Supply voltage range –0.5 4.6 V VCCB Supply voltage range –0.5 6.5 V VI Input voltage range (2) –0.5 6.5 V –0.5 6.
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TXB0108 SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 Recommended Operating Conditions (1) www.ti.com (2) VCCA VCCA VCCB Supply voltage VIH High-level input voltage VIL Low-level input voltage Δt/Δv Input transition rise or fall rate TA Operating free-air temperature (1) (2) (3) 4 VCCB Data inputs OE 1.2 V to 3.6 V Data inputs 1.2 V to 5.5 V OE 1.2 V to 3.6 V A-port inputs 1.2 V to 3.6 V B-port inputs 1.2 V to 3.6 V 1.65 V to 5.5 V 1.65 V to 5.5 V MIN MAX 1.2 3.6 1.65 5.
PAGE 5
TXB0108 www.ti.com SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 Electrical Characteristics (1) (2) over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VOHA IOH = –20 mA VOLA IOL = 20 mA VOHB IOH = –20 mA VOLB II IOZ –40°C to 85°C MAX MIN MAX 1.1 0.9 0.4 1.65 V to 5.5 V VCCB – 0.4 1.65 V to 5.5 V UNIT V VCCA – 0.4 1.2 V V V 0.4 V 1.2 V to 3.6 V 1.65 V to 5.5 V ±1 ±2 mA A port 0V 0 V to 5.5 V ±1 ±2 B port 0 V to 3.
PAGE 6
TXB0108 SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 www.ti.com Timing Requirements over recommended operating free-air temperature range, VCCA = 1.8 V ± 0.15 V (unless otherwise noted) VCCB = 1.8 V ± 0.15 V MIN MAX Data rate tw VCCB = 2.5 V ± 0.2 V MIN MAX 52 Pulse duration Data inputs VCCB = 3.3 V ± 0.3 V MIN MAX 60 19 VCCB = 5 V ± 0.5 V MIN 60 17 60 17 UNIT MAX 17 Mbps ns Timing Requirements over recommended operating free-air temperature range, VCCA = 2.5 V ± 0.
PAGE 7
TXB0108 www.ti.com SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 Switching Characteristics over recommended operating free-air temperature range, VCCA = 1.5 V ± 0.1 V (unless otherwise noted) PARAMETER tpd FROM (INPUT) TO (OUTPUT) A B ten OE tdis OE VCCB = 1.8 V ± 0.15 V VCCB = 2.5 V ± 0.2 V VCCB = 3.3 V ± 0.3 V VCCB = 5 V ± 0.5 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX B 1.4 12.9 1.2 10.1 1.1 10 0.8 9.9 A 0.9 14.2 0.7 12 0.4 11.7 0.3 13.
PAGE 8
TXB0108 SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 www.ti.com Switching Characteristics over recommended operating free-air temperature range, VCCA = 2.5 V ± 0.2 V (unless otherwise noted) PARAMETER tpd FROM (INPUT) TO (OUTPUT) A B ten OE tdis OE VCCB = 2.5 V ± 0.2 V VCCB = 3.3 V ± 0.3 V VCCB = 5 V ± 0.5 V UNIT MIN MAX MIN MAX MIN MAX B 1.1 6.4 1 5.3 0.9 4.7 A 1 7 0.6 5.6 0.3 4.4 A 1 1 1 B 1 1 1 A 5 16.9 4.9 15 4.5 13.8 B 4.8 21.8 4.5 17.9 4.
PAGE 9
TXB0108 www.ti.com SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 Operating Characteristics TA = 25°C VCCA 1.2 V 1.2 V 1.5 V 1.8 V 2.5 V 2.5 V 3.3 V 5V 3.3 V to 5V VCCB PARAMETER TEST CONDITIONS 5V 1.
PAGE 10
TXB0108 SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 www.ti.com PRINCIPLES OF OPERATION Applications The TXB0108 can be used in level-translation applications for interfacing devices or systems operating at different interface voltages with one another. Architecture The TXB0108 architecture (see Figure 1) does not require a direction-control signal to control the direction of data flow from A to B or from B to A.
PAGE 11
TXB0108 www.ti.com SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 IIN VT/4 kW VIN –(VD – VT)/4 kW A. VT is the input threshold voltage of the TXB0108 (typically VCCI/2). B. VD is the supply voltage of the external driver. Figure 2. Typical IIN vs VIN Curve Power Up During operation, ensure that VCCA ≤ VCCB at all times. During power-up sequencing, VCCA ≥ VCCB does not damage the device, so any power supply can be ramped up first.
PAGE 12
TXB0108 SCES643B – NOVEMBER 2006 – REVISED FEBRUARY 2010 www.ti.com PARAMETER MEASUREMENT INFORMATION 2 × VCCO From Output Under Test 15 pF 15 pF 1 MW Open 50 kW TEST tPZL/tPLZ tPHZ/tPZH LOAD CIRCUIT FOR ENABLE/DISABLE TIME MEASUREMENT LOAD CIRCUIT FOR MAX DATA RATE, PULSE DURATION PROPAGATION DELAY OUTPUT RISE AND FALL TIME MEASUREMENT S1 50 kW From Output Under Test S1 2 × VCCO Open VCCI Input VCCI/2 VCCI/2 0V tPLH tPHL tw Output VCCO/2 0.9 y VCCO 0.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 14-Oct-2010 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 30-May-2011 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TXB0108DQSR USON TXB0108PWR TXB0108RGYR TXB0108ZXYR SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant DQS 20 3000 177.8 12.4 2.21 4.22 0.81 4.0 12.0 Q1 TSSOP PW 20 2000 330.0 16.4 6.95 7.1 1.6 8.0 16.0 Q1 VQFN RGY 20 3000 330.0 12.4 3.8 4.8 1.6 8.0 12.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 30-May-2011 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TXB0108DQSR USON DQS 20 3000 202.0 201.0 28.0 TXB0108PWR TSSOP PW 20 2000 346.0 346.0 33.0 TXB0108RGYR VQFN RGY 20 3000 355.0 350.0 50.0 TXB0108ZXYR BGA MICROSTAR JUNIOR ZXY 20 2500 340.5 338.1 20.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
PAGE 25
Application Report SCEA043 – March 2010 A Guide to Voltage Translation With TXB-Type Translators Susan Curtis, Dave Moon ....................................................................................... High Volume Linear ABSTRACT Modern trends are driving the need for lower supply voltages across many system-level designs.
PAGE 26
The Need For Voltage-Level Translation 1 www.ti.com The Need For Voltage-Level Translation The need for voltage level translation is becoming increasingly significant in today's electronic systems. As the digital switching level standards have continued to progress toward lower voltage levels, system incompatibilities have arisen. Figure 1 illustrates the trend toward lower system voltage levels and demonstrates the incompatibilities that mixed voltage systems can face. 5V VCC 4.44 V VOH 0.
PAGE 27
Auto-Direction Sensing Voltage Translator Architecture www.ti.com VCCB VCCA Oneshot T1 4 kΩ Translator Oneshot A-port B-port T2 Oneshot T3 4 kΩ Translator Oneshot T4 Figure 2. Basic TXB010x Architecture The TXB translators incorporate a weak buffer with one-shot (O.S.) circuitry to improve switching speeds for rising and falling edges.
PAGE 28
Auto-Direction Sensing Voltage Translator Architecture www.ti.com The O.S. reduces the output impedance during the transition allowing the TXB device to drive a load while maintaining fast propagation delays and edge rates. Once the transition is completed, the O.S. circuit times out, and the buffer and the 4-kΩ pullup resistor hold the B-port signal high or low.
PAGE 29
Driving External Loads with TXB Translators www.ti.com 3 Driving External Loads with TXB Translators TXB devices were architected for driving high-impedance loads. If the application requires an external pull-up or pull-down resistor (Rpu or Rpd), special consideration must be given to the resistor value. When the output is in a steady high or low dc state, it is exclusively driven by the 4-kΩ impedance buffer.
PAGE 30
Output Enable Control www.ti.com With regard to capacitive loads, TXB translators are designed to drive up to 70 pF without issue. If capacitive loading is larger than 70 pF, the O.S. will time-out after 10 ns and subsequently turn off before the output voltage is driven fully high or low. From there, the output will continue to rise or fall based on the RC time constant determined by the 4-kΩ buffer, load resistance and capacitive loading.
PAGE 31
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.