SN74AUC245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS www.ti.com SCES419A – JANUARY 2003 – REVISED MARCH 2005 FEATURES • VCC 1 20 3 4 19 OE 18 B1 17 B2 5 6 16 B3 15 B4 7 14 B5 13 B6 2 8 12 B7 9 10 11 B8 • • • • • A1 A2 A3 A4 A5 A6 A7 A8 DIR • RGY PACKAGE (TOP VIEW) Optimized for 1.8-V Operation and Is 3.6-V I/O Tolerant to Support Mixed-Mode Signal Operation Ioff Supports Partial-Power-Down Mode Operation Sub-1-V Operable Max tpd of 1.7 ns at 1.8 V Low Power Consumption, 20-µA Max ICC ±8-mA Output Drive at 1.8 V Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101) GND • DESCRIPTION/ORDERING INFORMATION This octal bus transceiver is operational at 0.8-V to 2.7-V VCC, but is designed specifically for 1.65-V to 1.95-V VCC operation. The SN74AUC245 is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. 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. ORDERING INFORMATION PACKAGE (1) TA –40°C to 85°C (1) ORDERABLE PART NUMBER TOP-SIDE MARKING QFN – RGY Tape and reel SN74AUC245RGYR MS245 VFBGA – GQN Tape and reel SN74AUC245GQNR MS245 Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 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 © 2003–2005, Texas Instruments Incorporated SN74AUC245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS www.ti.com SCES419A – JANUARY 2003 – REVISED MARCH 2005 GQN PACKAGE (TOP VIEW) 1 2 3 4 A B C D E TERMINAL ASSIGNMENTS 1 2 3 4 A A1 DIR VCC OE B A3 B2 A2 B1 C A5 A4 B4 B3 D A7 B6 A6 B5 E GND A8 B8 B7 FUNCTION TABLE INPUTS OE DIR OPERATION L L B data to A bus L H A data to B bus H X Isolation LOGIC DIAGRAM (POSITIVE LOGIC) DIR 1 19 A1 2 18 To Seven Other Channels Pin numbers shown are for the RGY package. 2 OE B1 SN74AUC245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS www.ti.com Absolute Maximum Ratings SCES419A – JANUARY 2003 – REVISED MARCH 2005 (1) over operating free-air temperature range (unless otherwise noted) MIN MAX VCC Supply voltage range –0.5 3.6 V VI Input voltage range (2) –0.5 3.6 V –0.5 3.6 V –0.5 VCC + 0.5 state (2) UNIT VO Voltage range applied to any output in the high-impedance or power-off VO Output voltage range (2) IIK Input clamp current VI < 0 –50 mA IOK Output clamp current VO < 0 –50 mA IO Continuous output current ±20 mA ±100 mA Continuous current through VCC or GND θJA Package thermal impedance Tstg Storage temperature range (1) (2) (3) (4) package (3) 78 RGY package (4) 37 GQN –65 V °C/W °C 150 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 negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed. The package thermal impedance is calculated in accordance with JESD 51-7. The package thermal impedance is calculated in accordance with JESD 51-5. Recommended Operating Conditions (1) VCC Supply voltage VIH High-level input voltage VCC = 0.8 V MIN MAX 0.8 2.7 VCC 3.6 0.65 × VCC 3.6 1.7 3.6 VCC = 1.1 V to 1.95 V 0 0.35 × VCC VCC = 2.3 V to 2.7 V 0 0.7 Active state 0 VCC 3-state 0 3.6 VCC = 1.1 V to 1.95 V VCC = 2.3 V to 2.7 V VCC = 0.8 V VIL Low-level input voltage VO Output voltage IOH High-level output current IOL Low-level output current Input transition rise or fall rate TA Operating free-air temperature (1) V V 0 VCC = 0.8 V –0.7 VCC = 1.1 V –3 VCC = 1.4 V –5 VCC = 1.65 V –8 VCC = 2.3 V –9 VCC = 0.8 V 0.7 VCC = 1.1 V 3 VCC = 1.4 V 5 VCC = 1.65 V 8 VCC = 2.3 V ∆t/∆v UNIT V V mA mA 9 –40 20 ns/V 85 °C All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. 3 SN74AUC245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS www.ti.com SCES419A – JANUARY 2003 – REVISED MARCH 2005 Electrical Characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VOH VOL MIN TYP (1) MAX VCC IOH = –100 µA 0.8 V to 2.7 V IOH = –0.7 mA 0.8 V IOH = –3 mA 1.1 V 0.8 IOH = –5 mA 1.4 V 1 IOH = –8 mA 1.65 V 1.2 IOH = –9 mA 2.3 V 1.8 IOL = 100 µA 0.8 V to 2.7 V IOL = 0.7 mA 0.8 V IOL = 3 mA 1.1 V 0.3 IOL = 5 mA 1.4 V 0.4 IOL = 8 mA 1.65 V 0.45 IOL = 9 mA 2.3 V 0.6 UNIT VCC – 0.1 0.55 V 0.2 0.25 V VI = VCC or GND 0 to 2.7 V ±5 µA Ioff VI or VO = 2.7 V 0 ±10 µA IOZ (2) VO = VCC or GND 2.7 V ±10 µA ICC VI = VCC or GND, 20 µA Ci VI = VCC or GND 2.5 V 2.5 3 pF Cio VO = VCC or GND 2.5 V 7.5 8 pF II (1) (2) All inputs IO = 0 0.8 V to 2.7 V All typical values are at TA = 25°C. For I/O ports, the parameter IOZ includes the input leakage current. Switching Characteristics over recommended operating free-air temperature range, CL = 15 pF (unless otherwise noted) (see Figure 1) FROM (INPUT) TO (OUTPUT) VCC = 0.8 V tpd A or B B or A ten OE tdis OE PARAMETER TYP VCC = 1.2 V ± 0.1 V VCC = 1.5 V ± 0.1 V VCC = 1.8 V ± 0.15 V VCC = 2.5 V ± 0.2 V UNIT MIN MAX MIN MAX MIN TYP MAX MIN MAX 5 1 3.2 0.6 2 0.5 1 1.7 0.4 1.4 ns A or B 9 1.2 4.9 1 3 0.8 1.2 2.4 0.6 1.8 ns A or B 9.5 1.9 5.7 1.2 4 0.9 1.9 4.1 0.6 2.9 ns Switching Characteristics over recommended operating free-air temperature range, CL = 30 pF (unless otherwise noted) (see Figure 1) FROM (INPUT) TO (OUTPUT) tpd A or B ten tdis PARAMETER 4 VCC = 1.8 V ± 0.15 V VCC = 2.5 V ± 0.2 V UNIT MIN TYP MAX MIN MAX B or A 0.6 1.3 2.2 0.5 1.8 ns OE A or B 1.1 1.5 3 1.1 2.4 ns OE A or B 1.6 2.2 4 0.8 2.6 ns SN74AUC245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS www.ti.com SCES419A – JANUARY 2003 – REVISED MARCH 2005 Operating Characteristics TA = 25°C PARAMETER Cpd Power dissipation capacitance Outputs enabled Outputs disabled TEST CONDITIONS VCC = 0.8 V VCC = 1.2 V VCC = 1.5 V VCC = 1.8 V VCC = 2.5 V TYP TYP TYP TYP TYP 20 21 21 23 27 1 1 1 1 1 f = 10 MHz UNIT pF 5 SN74AUC245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS www.ti.com SCES419A – JANUARY 2003 – REVISED MARCH 2005 PARAMETER MEASUREMENT INFORMATION 2 × VCC S1 RL From Output Under Test Open GND CL (see Note A) TEST S1 tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open 2 × VCC GND RL LOAD CIRCUIT VCC CL RL V∆ 0.8 V 1.2 V ± 0.1 V 1.5 V ± 0.1 V 1.8 V ± 0.15 V 2.5 V ± 0.2 V 1.8 V ± 0.15 V 2.5 V ± 0.2 V 15 pF 15 pF 15 pF 15 pF 15 pF 30 pF 30 pF 2 kΩ 2 kΩ 2 kΩ 2 kΩ 2 kΩ 1 kΩ 500 Ω 0.1 V 0.1 V 0.1 V 0.15 V 0.15 V 0.15 V 0.15 V VCC Timing Input VCC/2 0V tw tsu th VCC VCC/2 Input VCC/2 VCC VCC/2 VCC/2 Data Input 0V 0V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES VOLTAGE WAVEFORMS PULSE DURATION VCC VCC/2 Input VCC/2 0V tPHL tPLH VOH VCC/2 Output VCC/2 VOL tPHL VCC/2 VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES INVERTING AND NONINVERTING OUTPUTS VCC/2 VCC/2 0V tPZL tPLZ VCC VCC/2 tPZH VOH Output Output Waveform 1 S1 at 2 × VCC (see Note B) tPLH VCC/2 VCC Output Control Output Waveform 2 S1 at GND (see Note B) VOL + V∆ VOL tPHZ VCC/2 VOH - V∆ VOH ≈0 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES LOW- AND HIGH-LEVEL ENABLING 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 ≤ 10 MHz, ZO = 50 Ω, slew rate ≥ 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. All parameters and waveforms are not applicable to all devices. Figure 1. Load Circuit and Voltage Waveforms 6 PACKAGE OPTION ADDENDUM www.ti.com 4-Oct-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty SN74AUC245GQNR ACTIVE VFBGA GQN 20 1000 SNPB Level-1-240C-UNLIM SN74AUC245RGYR ACTIVE QFN RGY 20 1000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1YEAR SN74AUC245ZQNR ACTIVE VFBGA ZQN 20 1000 Green (RoHS & no Sb/Br) SNAGCU Level-1-260C-UNLIM TBD Lead/Ball Finish MSL Peak Temp (3) (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) 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. 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