SN74LVC2T45-Q1 www.ti.com SCES818 – SEPTEMBER 2010 DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS Check for Samples: SN74LVC2T45-Q1 FEATURES 1 • • • • • • • • Qualified for Automotive Applications Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.65-V to 5.5-V Power-Supply Range VCC Isolation Feature – If Either VCC Input Is at GND, Both Ports Are in the High-Impedance State DIR Input Circuit Referenced to VCCA Low Power Consumption, 10-mA Max ICC ±24-mA Output Drive at 3.3 V Ioff Supports Partial-Power-Down Mode Operation Max Data Rates – 420 Mbps (3.3-V to 5-V Translation) – 210 Mbps (Translate to 3.3 V) – 140 Mbps (Translate to 2.5 V) – 75 Mbps (Translate to 1.8 V) DESCRIPTION/ORDERING INFORMATION This dual-bit noninverting bus transceiver uses two separate configurable power-supply rails. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.65 V to 5.5 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 1.8-V, 2.5-V, 3.3-V, and 5-V voltage nodes. The SN74LVC2T45-Q1 is designed for asynchronous communication between two data buses. The logic levels of the direction-control (DIR) input activate either the B-port outputs or the A-port outputs. The device transmits data from the A bus to the B bus when the B-port outputs are activated, and from the B bus to the A bus when the A-port outputs are activated. The input circuitry on both A and B ports always is active and must have a logic HIGH or LOW level applied to prevent excess ICC and ICCZ. The SN74LVC2T45-Q1 is designed so that the DIR input circuit is supplied by VCCA. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The VCC isolation feature ensures that if either VCC input is at GND, both ports are in the high-impedance state. NanoFree™ package technology is a major breakthrough in IC packaging concepts, using the die as the package. ORDERING INFORMATION PACKAGE (1) TA –40°C to 125°C (1) VSSOP – DCU Reel of 3000 ORDERABLE PART NUMBER SN74LVC2T45QDCURQ1 TOP-SIDE MARKING CAWR For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. 1 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. Copyright © 2010, Texas Instruments Incorporated SN74LVC2T45-Q1 SCES818 – SEPTEMBER 2010 www.ti.com FUNCTION TABLE (1) (EACH TRANSCEIVER) (1) INPUT DIR OPERATION L B data to A bus H A data to B bus Input circuits of the data I/Os always are active. LOGIC DIAGRAM (POSITIVE LOGIC) DIR A1 5 2 7 A2 3 6 VCCA 2 B1 B2 VCCB Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 SN74LVC2T45-Q1 www.ti.com SCES818 – SEPTEMBER 2010 ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) MIN MAX Supply voltage range –0.5 6.5 V VI Input voltage range (2) –0.5 6.5 V VO Voltage range applied to any output in the high-impedance or power-off state (2) –0.5 6.5 V A port –0.5 VCCA + 0.5 B port –0.5 VCCB + 0.5 VCCA VCCB (3) UNIT VO Voltage range applied to any output in the high or low state (2) IIK Input clamp current VI < 0 –50 mA IOK Output clamp current VO < 0 –50 mA IO Continuous output current ±50 mA Continuous current through VCC or GND qJA Package thermal impedance (4) Tstg Storage temperature range (1) (2) (3) (4) DCU package –65 V ±100 mA 329.4 °C/W 150 °C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. The value of VCC is provided in the recommended operating conditions table. The package thermal impedance is calculated in accordance with JESD 51-7. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 3 SN74LVC2T45-Q1 SCES818 – SEPTEMBER 2010 www.ti.com RECOMMENDED OPERATING CONDITIONS (1) (2) (3) VCCI VCCA VCCB VCCO Supply voltage 1.65 V to 1.95 V High-level input voltage VIH Data inputs (4) MIN MAX 1.65 5.5 1.65 5.5 2.3 V to 2.7 V 1.7 3 V to 3.6 V Data inputs (4) VCCI × 0.7 VCCI × 0.35 2.3 V to 2.7 V 0.7 3 V to 3.6 V 0.8 4.5 V to 5.5 V High-level input voltage DIR (referenced to VCCA) (5) VCCA × 0.65 2.3 V to 2.7 V 1.7 3 V to 3.6 V 4.5 V to 5.5 V Low-level input voltage VI Input voltage VO Output voltage DIR (referenced to VCCA) (5) VCCA × 0.7 VCCA × 0.35 2.3 V to 2.7 V 0.7 3 V to 3.6 V 0.8 4.5 V to 5.5 V High-level output current IOL Low-level output current Δt/Δv Input transition rise or fall rate Data inputs Control input TA (1) (2) (3) (4) (5) 4 V VCCA × 0.3 0 5.5 V 0 VCCO V 1.65 V to 1.95 V IOH V 2 1.65 V to 1.95 V VIL V VCCI × 0.3 1.65 V to 1.95 V VIH V 2 1.65 V to 1.95 V VIL V VCCI × 0.65 4.5 V to 5.5 V Low-level input voltage UNIT –4 2.3 V to 2.7 V –8 3 V to 3.6 V –24 4.5 V to 5.5 V –32 1.65 V to 1.95 V 4 2.3 V to 2.7 V 8 3 V to 3.6 V 24 4.5 V to 5.5 V 32 1.65 V to 1.95 V 20 2.3 V to 2.7 V 20 3 V to 3.6 V 10 4.5 V to 5.5 V 5 1.65 V to 5.5 V 5 Operating free-air temperature –40 125 mA mA ns/V °C VCCI is the VCC associated with the input port. VCCO is the VCC associated with the output port. All unused data inputs of the device must be held at VCCI or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. For VCCI values not specified in the data sheet, VIH min = VCCI × 0.7 V, VIL max = VCCI × 0.3 V. For VCCI values not specified in the data sheet, VIH min = VCCA × 0.7 V, VIL max = VCCA × 0.3 V. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 SN74LVC2T45-Q1 www.ti.com SCES818 – SEPTEMBER 2010 ELECTRICAL CHARACTERISTICS (1) (2) over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS IOH = –100 mA IOH = –8 mA 1.65 V to 4.5 V 1.65 V to 4.5 V 1.65 V 1.65 V 1.2 2.3 V 2.3 V 1.9 3V 3V 2.4 3.8 VI = VIH IOH = –24 mA DIR A port Ioff B port A or B port IOZ ICCA V 0.1 1.65 V 1.65 V 0.45 VI = VIL 2.3 V 2.3 V 0.3 IOL = 24 mA 3V 3V 0.55 IOL = 32 mA 4.5 V 4.5 V 0.55 1.65 V to 5.5 V 1.65 V to 5.5 V ±1 ±2 0V 0 to 5.5 V ±1 ±9 0 to 5.5 V 0V ±1 ±9 1.65 V to 5.5 V 1.65 V to 5.5 V ±1 ±9 1.65 V to 5.5 V 1.65 V to 5.5 V 4 5V 0V 2 –12 VI = VCCA or GND VI or VO = 0 to 5.5 V VO = VCCO or GND VI = VCCI or GND, IO = 0 DIR DIR at VCCA – 0.6 V, B port = open, A port at VCCA or GND ΔICCB B port One B port at VCCB – 0.6 V, DIR at GND, A port = open CI DIR Cio A or B port UNIT VCCO – 0.1 4.5 V A port (1) (2) MAX 1.65 V to 4.5 V One A port at VCCA – 0.6 V, DIR at VCCA, B port = open ΔICCA MIN 4.5 V 0V 5V 1.65 V to 5.5 V 1.65 V to 5.5 V 5V 0V –12 0V 5V 2 1.65 V to 5.5 V 1.65 V to 5.5 V 4 VI = VCCI or GND, IO = 0 ICCA + ICCB MAX 1.65 V to 4.5 V VI = VCCI or GND, IO = 0 ICCB TYP IOL = 100 mA IOL = 8 mA II MIN IOH = –32 mA IOL = 4 mA VOL –40°C to 125°C VCCB IOH = –4 mA VOH TA = 25°C VCCA V mA mA mA mA 4 mA mA 50 3 V to 5.5 V 3 V to 5.5 V mA 50 3 V to 5.5 V 3 V to 5.5 V 50 VI = VCCA or GND 3.3 V 3.3 V 2.5 pF VO = VCCA/B or GND 3.3 V 3.3 V 6 pF mA VCCO is the VCC associated with the output port. VCCI is the VCC associated with the input port. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 5 SN74LVC2T45-Q1 SCES818 – SEPTEMBER 2010 www.ti.com SWITCHING CHARACTERISTICS over recommended operating free-air temperature range, VCCA = 1.8 V ± 0.15 V (unless otherwise noted) (see Figure 1) PARAMETER tPLH tPHL tPLH tPHL tPHZ tPLZ tPHZ tPLZ (1) tPZH (1) tPZL (1) tPZH (1) tPZL (1) FROM (INPUT) TO (OUTPUT) A B B A DIR A DIR B DIR A DIR B 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 3 21.7 2.2 14.3 1.7 12.3 1.4 11.2 2.8 28.3 2.2 12.5 1.8 11.1 1.7 11 3 21.7 2.3 20 2.1 19.5 1.9 19.1 2.8 18.3 2.1 16.9 2 16.6 1.8 16.2 10.6 34.9 10.3 34.5 10.5 34.5 10.7 33.3 7.3 23.7 7.5 23.6 7.5 23.5 7 23.4 10 31.9 8.4 18.9 6.5 15.3 4.1 12.6 6.5 23.5 7.2 16.6 4.3 13.7 2.1 11.1 45.2 36.6 33.2 30.2 50.2 35.8 31.9 28.8 45.4 37.9 35.8 34.6 53.2 47 45.6 44.3 ns ns ns ns ns ns The enable time is a calculated value, derived using the formula shown in the enable times section. SWITCHING CHARACTERISTICS over recommended operating free-air temperature range, VCCA = 2.5 V ± 0.2 V (unless otherwise noted) (see Figure 1) PARAMETER tPLH tPHL tPLH tPHL tPHZ tPLZ tPHZ tPLZ (1) 6 tPZH (1) tPZL (1) tPZH (1) tPZL (1) FROM (INPUT) TO (OUTPUT) A B B A DIR A DIR B DIR A DIR B VCCB = 1.8 V ±0.15 V MIN VCCB = 2.5 V ±0.2 V VCCB = 3.3 V ±0.3 V VCCB = 5 V ±0.5 V UNIT MAX MIN MAX MIN MAX MIN MAX 2.3 20 1.5 12.5 1.3 10.4 1.1 9.1 2.1 16.9 1.4 11.5 1.3 9.4 0.9 8.6 2.2 14.3 1.5 12.5 1.4 12 1 11.5 2.2 12.5 1.4 11.5 1.3 11 0.9 10.2 6.6 21.1 7.1 20.8 6.8 20.8 5.2 20.5 5.3 16.6 5.2 16.5 4.9 16.3 4.8 16.3 10.7 31.9 8.1 17.9 5.8 14.5 3.5 11.6 7.8 22.9 6.2 15.2 3.6 12.9 1.4 11.2 37.2 27.7 24.9 21.7 44.4 29.4 25.5 21.8 28.6 29 26.7 25.4 38 32.3 30.2 29.1 ns ns ns ns ns ns The enable time is a calculated value, derived using the formula shown in the enable times section. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 SN74LVC2T45-Q1 www.ti.com SCES818 – SEPTEMBER 2010 SWITCHING CHARACTERISTICS over recommended operating free-air temperature range, VCCA = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1) PARAMETER tPLH tPHL tPLH tPHL tPHZ tPLZ tPHZ tPLZ (1) tPZH (1) tPZL (1) tPZH (1) tPZL (1) FROM (INPUT) TO (OUTPUT) A B B A DIR A DIR B DIR A DIR B 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 2.1 19.5 1.4 12 0.7 9.6 0.7 8.4 2 16.6 1.3 11 0.8 9 0.7 8 1.7 12.3 1.3 10.4 0.7 9.8 0.6 9.4 1.8 11.1 1.3 9.4 0.8 9 0.7 8.5 5 14.9 5.1 14.8 5 14.8 5 14.4 3.4 12.4 3.7 12.4 3.9 12.1 3.3 11.8 11.2 31.3 8 17.7 5.8 14.4 2.9 11.4 9.4 21.7 5.6 15.3 4.3 12.3 1 9.6 34 25.7 22.1 19 42.4 27.1 23.4 19.9 31.9 24.4 21.9 20.2 31.5 25.8 23.8 22.4 ns ns ns ns ns ns The enable time is a calculated value, derived using the formula shown in the enable times section. SWITCHING CHARACTERISTICS over recommended operating free-air temperature range, VCCA = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1) PARAMETER tPLH tPHL tPLH tPHL tPHZ tPLZ tPHZ tPLZ (1) tPZH (1) tPZL (1) tPZH (1) tPZL (1) FROM (INPUT) TO (OUTPUT) A B B A DIR A DIR B DIR A DIR B VCCB = 1.8 V ±0.15 V MIN MAX 1.9 1.8 1.4 1.7 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 19.1 1 11.5 0.6 9.4 0.5 7.9 16.2 0.9 10.2 0.7 8.5 0.5 7.5 11.2 1 9.1 0.7 8.4 0.5 7.9 11 0.9 8.6 0.7 8 0.5 7.5 2.9 12.2 2.9 11.9 2.8 11.9 2.2 11.8 1.4 10.9 1.3 10.7 0.7 10.7 0.7 10.6 11.2 30.1 7.2 17.9 5.8 14.1 1.3 11.3 8.4 20.9 5 15 4 11.7 1 9.6 32.1 24.1 20.1 18.5 41.1 26.5 22.1 18.8 30 22.2 20.1 18.5 28.4 22.1 22.4 19.3 ns ns ns ns ns ns The enable time is a calculated value, derived using the formula shown in the enable times section. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 7 SN74LVC2T45-Q1 SCES818 – SEPTEMBER 2010 www.ti.com OPERATING CHARACTERISTICS TA = 25°C PARAMETER CpdA CpdB (1) 8 (1) A-port input, B-port output B-port input, A-port output (1) A-port input, B-port output B-port input, A-port output TEST CONDITIONS CL = 0 pF, f = 10 MHz, tr = tf = 1 ns CL = 0 pF, f = 10 MHz, tr = tf = 1 ns VCCA = VCCB = 1.8 V VCCA = VCCB = 2.5 V VCCA = VCCB = 3.3 V VCCA = VCCB = 5 V TYP TYP TYP TYP 3 4 4 4 18 19 20 21 18 19 20 21 3 4 4 4 UNIT pF pF Power dissipation capacitance per transceiver Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 SN74LVC2T45-Q1 www.ti.com SCES818 – SEPTEMBER 2010 Power-Up Considerations A proper power-up sequence always should be followed to avoid excessive supply current, bus contention, oscillations, or other anomalies. To guard against such power-up problems, take the following precautions: 1. Connect ground before any supply voltage is applied. 2. Power up VCCA. 3. VCCB can be ramped up along with or after VCCA. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 9 SN74LVC2T45-Q1 SCES818 – SEPTEMBER 2010 www.ti.com TYPICAL CHARACTERISTICS TYPICAL PROPAGATION DELAY (A to B) vs LOAD CAPACITANCE TA = 25°C, VCCA = 1.8 V 10 10 9 9 VCCB = 1.8 V 8 8 7 7 6 6 t PLH− ns t PHL − ns VCCB = 1.8 V VCCB = 2.5 V 5 VCCB = 2.5 V 5 VCCB = 3.3 V 4 4 VCCB = 5 V VCCB = 3.3 V 3 3 VCCB = 5 V 2 2 1 1 0 0 0 5 10 15 20 25 30 0 35 5 10 15 20 25 30 35 CL − pF CL − pF TYPICAL PROPAGATION DELAY (B to A) vs LOAD CAPACITANCE TA = 25°C, VCCA = 1.8 V 10 10 9 9 8 VCCB = 1.8 V 8 VCCB = 2.5 V 7 7 6 6 5 VCCB = 2.5 V VCCB = 3.3 V 4 VCCB = 5 V t PLH − ns t PHL − ns VCCB = 1.8 V VCCB = 5 V 5 4 3 3 2 2 1 1 0 0 5 10 VCCB = 3.3 V 15 20 25 30 35 0 0 5 CL − pF 10 Submit Documentation Feedback 10 15 20 CL − pF 25 30 35 Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 SN74LVC2T45-Q1 www.ti.com SCES818 – SEPTEMBER 2010 TYPICAL CHARACTERISTICS (continued) TYPICAL PROPAGATION DELAY (A to B) vs LOAD CAPACITANCE TA = 25°C, VCCA = 2.5 V 10 10 9 9 8 8 7 VCCB = 1.8 V 6 t PLH − ns t PHL − ns 7 VCCB = 1.8 V 6 5 VCCB = 2.5 V 4 4 VCCB = 3.3 V 3 3 VCCB = 5 V 5 VCCB = 2.5 V VCCB = 3.3 V 2 2 VCCB = 5 V 1 1 0 0 0 10 5 15 20 25 30 0 35 10 5 15 20 25 30 35 CL − pF CL − pF 10 10 9 9 8 8 7 7 6 t PLH − ns t PHL − ns TYPICAL PROPAGATION DELAY (B to A) vs LOAD CAPACITANCE TA = 25°C, VCCA = 2.5 V VCCB = 1.8 V 5 6 5 4 4 3 3 VCCB = 2.5 V VCCB = 3.3 V VCCB = 5 V 2 VCCB = 2.5 V VCCB = 3.3 V VCCB = 5 V 2 1 0 VCCB = 1.8 V 1 0 5 10 15 20 CL − pF 25 30 35 0 0 5 10 15 20 25 30 35 CL − pF Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 11 SN74LVC2T45-Q1 SCES818 – SEPTEMBER 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) TYPICAL PROPAGATION DELAY (A to B) vs LOAD CAPACITANCE TA = 25°C, VCCA = 3.3 V 10 10 9 9 8 8 7 7 VCCB = 1.8 V 6 6 t PLH − ns t PHL − ns VCCB = 1.8 V 5 VCCB = 2.5 V 4 VCCB = 2.5 V 5 4 3 3 2 2 VCCB = 3.3 V VCCB = 5 V VCCB = 3.3 V 1 1 VCCB = 5 V 0 0 0 5 10 15 20 25 30 35 0 5 10 15 20 25 30 35 CL − pF CL − pF 10 10 9 9 8 8 7 7 6 6 t PLH − ns t PHL − ns TYPICAL PROPAGATION DELAY (B to A) vs LOAD CAPACITANCE TA = 25°C, VCCA = 3.3 V 5 VCCB = 1.8 V 4 3 VCCB = 1.8 V 5 4 3 2 VCCB = 2.5 V VCCB = 3.3 V VCCB = 3.3 V 1 VCCB = 2.5 V 2 1 VCCB = 5 V 0 VCCB = 5 V 0 0 5 10 15 20 25 30 35 0 5 12 10 15 20 25 30 35 CL − pF CL − pF Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 SN74LVC2T45-Q1 www.ti.com SCES818 – SEPTEMBER 2010 TYPICAL CHARACTERISTICS (continued) TYPICAL PROPAGATION DELAY (A to B) vs LOAD CAPACITANCE TA = 25°C, VCCA = 5 V 10 10 9 9 8 8 7 7 VCCB = 1.8 V VCCB = 1.8 V t PLH − ns t PHL − ns 6 5 4 6 5 VCCB = 2.5 V 4 VCCB = 2.5 V VCCB = 3.3 V 3 3 2 2 VCCB = 5 V VCCB = 3.3 V 1 0 1 VCCB = 5 V 0 5 10 15 20 25 30 0 35 0 5 10 15 CL − pF 20 25 30 35 15 20 CL − pF 25 30 35 CL − pF 10 10 9 9 8 8 7 7 6 6 t PLH − ns t PHL− ns TYPICAL PROPAGATION DELAY (B to A) vs LOAD CAPACITANCE TA = 25°C, VCCA = 5 V 5 4 VCCB = 1.8 V 3 VCCB = 2.5 V 5 VCCB = 1.8 V 4 VCCB = 2.5 V 3 2 2 VCCB = 3.3 V VCCB = 3.3 V VCCB = 5 V 1 0 0 5 10 VCCB = 5 V 1 15 20 25 30 35 0 0 5 CL − pF 10 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 13 SN74LVC2T45-Q1 SCES818 – SEPTEMBER 2010 www.ti.com PARAMETER MEASUREMENT INFORMATION 2 × VCCO S1 RL From Output Under Test Open GND CL (see Note A) TEST S1 tpd tPLZ/tPZL tPHZ/tPZH Open 2 × VCCO GND RL tw LOAD CIRCUIT VCCI VCCI/2 Input VCCO CL RL VTP 1.8 V ± 0.15 V 2.5 V ± 0.2 V 3.3 V ± 0.3 V 5 V ± 0.5 V 15 pF 15 pF 15 pF 15 pF 2 kΩ 2 kΩ 2 kΩ 2 kΩ 0.15 V 0.15 V 0.3 V 0.3 V VCCI/2 0V VOLTAGE WAVEFORMS PULSE DURATION VCCA Output Control (low-level enabling) VCCA/2 VCCA/2 0V tPLZ tPZL VCCI Input VCCI/2 VCCI/2 0V tPLH Output tPHL VOH VCCO/2 VOL VCCO/2 VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VCCO Output Waveform 1 S1 at 2 × VCCO (see Note B) VCCO/2 VOL + VTP VOL tPHZ tPZH Output Waveform 2 S1 at GND (see Note B) VCCO/2 VOH − VTP VOH 0V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR v10 MHz, ZO = 50 Ω, dv/dt ≥ 1 V/ns. D. The outputs are measured one at a time, with one transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd. H. VCCI is the VCC associated with the input port. I. VCCO is the VCC associated with the output port. J. All parameters and waveforms are not applicable to all devices. Figure 1. Load Circuit and Voltage Waveforms 14 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 SN74LVC2T45-Q1 www.ti.com SCES818 – SEPTEMBER 2010 APPLICATION INFORMATION The following shows an example of the SN74LVC2T45-Q1 being used in a unidirectional logic level-shifting application. VCC2 VCC1 VCC1 VCC2 1 8 2 7 3 6 4 5 VCC2 VCC1 SYSTEM-1 SYSTEM-2 PIN NAME FUNCTION 1 VCCA VCC1 SYSTEM-1 supply voltage (1.65 V to 5.5 V) 2 A1 OUT1 Output level depends on VCC1 voltage. 3 A2 OUT2 Output level depends on VCC1 voltage. 4 GND GND Device GND 5 DIR DIR GND (low level) determines B-port to A-port direction. 6 B2 IN2 Input threshold value depends on VCC2 voltage. Input threshold value depends on VCC2 voltage. 7 B1 IN1 8 VCCB VCC2 DESCRIPTION SYSTEM-2 supply voltage (1.65 V to 5.5 V) Figure 2. Unidirectional Logic Level-Shifting Application Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 15 SN74LVC2T45-Q1 SCES818 – SEPTEMBER 2010 www.ti.com APPLICATION INFORMATION Figure 3 shows the SN74LVC2T45-Q1 being used in a bidirectional logic level-shifting application. Since the SN74LVC2T45-Q1 does not have an output-enable (OE) pin, the system designer should take precautions to avoid bus contention between SYSTEM-1 and SYSTEM-2 when changing directions. VCC1 VCC1 VCC2 Pullup/Down or Bus Hold(1) Pullup/Down or Bus Hold(1) I/O-1 VCC2 1 8 2 7 3 6 4 5 I/O-2 DIR CTRL SYSTEM-1 SYSTEM-2 The following table shows data transmission from SYSTEM-1 to SYSTEM-2 and then from SYSTEM-2 to SYSTEM-1. STATE DIR CTRL I/O-1 I/O-2 1 H Out In 2 H Hi-Z Hi-Z SYSTEM-2 is getting ready to send data to SYSTEM-1. I/O-1 and I/O-2 are disabled. The bus-line state depends on pullup or pulldown. (1) 3 L Hi-Z Hi-Z DIR bit is flipped. I/O-1 and I/O-2 still are disabled. The bus-line state depends on pullup or pulldown. (1) 4 L In Out SYSTEM-2 data to SYSTEM-1 (1) DESCRIPTION SYSTEM-1 data to SYSTEM-2 SYSTEM-1 and SYSTEM-2 must use the same conditions, i.e., both pullup or both pulldown. Figure 3. Bidirectional Logic Level-Shifting Application Enable Times Calculate the enable times for the SN74LVC2T45-Q1 using the following formulas: • tPZH (DIR to A) = tPLZ (DIR to B) + tPLH (B to A) • tPZL (DIR to A) = tPHZ (DIR to B) + tPHL (B to A) • tPZH (DIR to B) = tPLZ (DIR to A) + tPLH (A to B) • tPZL (DIR to B) = tPHZ (DIR to A) + tPHL (A to B) In a bidirectional application, these enable times provide the maximum delay from the time the DIR bit is switched until an output is expected. For example, if the SN74LVC2T45-Q1 initially is transmitting from A to B, then the DIR bit is switched; the B port of the device must be disabled before presenting it with an input. After the B port has been disabled, an input signal applied to it appears on the corresponding A port after the specified propagation delay. 16 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN74LVC2T45-Q1 PACKAGE OPTION ADDENDUM www.ti.com 30-Jan-2012 PACKAGING INFORMATION Orderable Device SN74LVC2T45QDCURQ1 Status (1) ACTIVE Package Type Package Drawing US8 DCU Pins Package Qty 8 3000 Eco Plan (2) Green (RoHS & no Sb/Br) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) CU NIPDAU Level-1-260C-UNLIM (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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