SN74AXC4T774RSVR

SN74AXC4T774 ZHCSK02B – JULY 2019 – REVISED MAY 2021 具有独立方向控制、可配置电压转换和三态输出功能的 SN74AXC4T774 4 位双 电源总线收发器 1 特性 • 完全可配置的双轨设计可允许各个端口在 0.65V 至 3.6V 的电源电压范围内运行 • 工作温度范围为 –40°C 至 +125°C • 独立方向控制引脚，支持可配置的升降压转换 • 无干扰电源时序 • 从 1.8V 转换到 3.3V 时，支持高达 310Mbps 的转 换速率 • VCC 隔离特性 – 如果任何一个 VCC 输入低于 100mV，则所有 I/O 输出均禁用且处于高阻抗状态 • Ioff 支持局部断电模式运行 • 兼容 AVC 系列电平转换器 • 闩锁性能超过 100mA，符合 JESD 78 II 类规范 • ESD 保护性能超过 JESD 22 规范要求 – 8000V 人体放电模型 – 1000V 充电器件模型 2 应用 • • • • • • 企业与通信 工业 个人电子产品 无线基础设施 楼宇自动化 销售终端 SN74AXC4T774 器件旨在实现数据总线间的异步通 信。根据方向控制输入 (DIRx) 的逻辑电平，该器件将 数据从 A 总线传输至 B 总线，或者将数据从 B 总线传 输至 A 总线。输出使能输入 (OE) 用于禁用输出，从而 有效隔离总线。SN74AXC4T774 器件旨在使控制引脚 （DIRx 和 OE）以 VCCA 为基准。 为了确保电平转换器 I/O 在上电或断电期间处于高阻抗 状态，OE 引脚应通过上拉电阻器连接至 VCCA。 该器件完全符合使用 Ioff 电流的部分断电应用的规范要 求。当器件断电时，Ioff 保护电路可确保不从输入、输 出或偏置到特定电压的组合 I/O 获取多余电流，也不向 其提供多余电流。 VCC 隔离特性能确保当 VCCA 或 VCCB 低于 100mV 时，可通过禁用 I/O 端口的输出来将其设为高阻抗状 态。 无干扰电源时序使电源轨能以任何顺序打开或关断，从 而提供强大的电源时序性能。 器件信息 封装尺寸（标称值） SN74AXC4T774PW TSSOP (16) 5.00mm x 4.40mm SN74AXC4T774BQB WQFN (16) 2.50mm x 3.50mm SN74AXC4T774RSV UQFN (16) 2.60mm x 1.80mm (1) 3 说明 SN74AXC4T774 是一款使用两个独立可配置电源轨的 四位同相总线收发器。当 VCCA 和 VCCB 电源电压低至 0.65V 时 ， 该 器 件 可 正 常 工 作 。 A 端 口 用 于 跟 踪 VCCA ，可支持 0.65V 至 3.6V 范围内的任何电源电 压。B 端口用于跟踪 VCCB ，同样支持 0.65V 至 3.6V 范围内的任何电源电压。此外，SN74AXC4T774 还与 单电源系统兼容。 封装(1) 器件型号 如需了解所有可用封装，请参阅数据表末尾的可订购产品附 录。 One of Four Transceivers VCCA VCCB DIRx OE Bx Ax 功能方框图 本文档旨在为方便起见，提供有关 TI 产品中文版本的信息，以确认产品的概要。有关适用的官方英文版本的最新信息，请访问 www.ti.com，其内容始终优先。TI 不保证翻译的准确性和有效性。在实际设计之前，请务必参考最新版本的英文版本。 English Data Sheet: SCES898 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 Table of Contents 1 特性................................................................................... 1 2 应用................................................................................... 1 3 说明................................................................................... 1 4 Revision History.............................................................. 2 5 Pin Configuration and Functions...................................3 6 Specifications.................................................................. 4 6.1 Absolute Maximum Ratings........................................ 4 6.2 ESD Ratings............................................................... 4 6.3 Recommended Operating Conditions.........................5 6.4 Thermal Information....................................................5 6.5 Electrical Characteristics.............................................6 6.6 Switching Characteristics, VCCA = 0.7 ± 0.05 V.......... 7 6.7 Switching Characteristics, VCCA = 0.8 ± 0.04 V.......... 7 6.8 Switching Characteristics, VCCA = 0.9 ± 0.045 V........ 8 6.9 Switching Characteristics, VCCA = 1.2 ± 0.1 V............ 9 6.10 Switching Characteristics, VCCA = 1.5 ± 0.1 V.......... 9 6.11 Switching Characteristics, VCCA = 1.8 ± 0.15 V...... 10 6.12 Switching Characteristics, VCCA = 2.5 ± 0.2 V........ 11 6.13 Switching Characteristics, VCCA = 3.3 ± 0.3 V........ 11 6.14 Operating Characteristics: TA = 25°C..................... 13 6.15 Typical Characteristics............................................ 15 7 Parameter Measurement Information.......................... 16 7.1 Load Circuit and Voltage Waveforms........................16 8 Detailed Description......................................................18 8.1 Overview................................................................... 18 8.2 Functional Block Diagram......................................... 18 8.3 Feature Description...................................................18 8.4 Device Functional Modes..........................................19 9 Application and Implementation.................................. 20 9.1 Application Information............................................. 20 9.2 Typical Application.................................................... 20 10 Power Supply Recommendations..............................22 11 Layout........................................................................... 22 11.1 Layout Guidelines................................................... 22 11.2 Layout Example...................................................... 22 12 Device and Documentation Support..........................23 12.1 Related Documentation.......................................... 23 12.2 接收文档更新通知................................................... 23 12.3 支持资源..................................................................23 12.4 Trademarks............................................................. 23 12.5 Electrostatic Discharge Caution..............................23 12.6 Glossary..................................................................23 13 Mechanical, Packaging, and Orderable Information.................................................................... 23 4 Revision History Changes from Revision A (July 2020) to Revision B (May 2021) Page • Updated the Serial Peripheral Interface (SPI) Application figure in the Typical Application section................. 20 Changes from Revision * (July 2019) to Revision A (July 2020) Page • 更新了整个文档中的表格、图和交叉参考的编号格式......................................................................................... 1 2 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 DIR1 DIR1 15 VCCA VCCB A1 3 14 B1 A1 3 A2 4 13 B2 A2 4 A3 5 12 11 B3 A3 5 A4 6 1 1 2 16 DIR2 16 VCCA 5 Pin Configuration and Functions DIR2 2 15 VCCB 14 B1 13 B2 Thermal Pad 12 B3 A4 6 B4 11 B4 DIR3 7 8 10 GND OE 9 DIR4 GND 10 9 OE 7 DIR4 8 DIR3 图 5-2. BQB Package 16-Pin WQFN Transparent Top View DIR2 DIR1 VCCA VCCB 图 5-1. PW Package 16-Pin TSSOP Top View 16 15 14 13 12 B1 A2 2 11 B2 A3 3 10 B3 A4 4 9 B4 DIR3 6 DIR4 5 7 8 OE 1 GND A1 图 5-3. RSV Package 16-Pin UQFN Transparent Top View Pin Functions PIN NAME NO. TYPE DESCRIPTION PW RSV BQB A1 3 1 3 I/O Input/output A1. Referenced to VCCA. A2 4 2 4 I/O Input/output A2. Referenced to VCCA. A3 5 3 5 I/O Input/output A3. Referenced to VCCA. A4 6 4 6 I/O Input/output A4. Referenced to VCCA. B1 14 12 14 I/O Input/output B1. Referenced to VCCB. B2 13 11 13 I/O Input/output B2. Referenced to VCCB. B3 12 10 12 I/O Input/output B3. Referenced to VCCB. B4 11 9 11 I/O Input/output B4. Referenced to VCCB. DIR1 1 15 1 I Direction-control input for port 1. Referenced to VCCA. DIR2 2 16 2 I Direction-control input for port 2. Referenced to VCCA. DIR3 7 5 7 I Direction-control input for port 3. Referenced to VCCA. DIR4 8 6 8 I Direction-control input for port 4. Referenced to VCCA. OE 9 7 9 I Tri-state output enable. Pull OE high to place all outputs in tri-state mode. Referenced to VCCA. GND 10 8 10 — Ground VCCA 16 14 16 — A-port power supply voltage. 0.65 V ≤ VCCA ≤ 3.6 V VCCB 15 13 15 — B-port power supply voltage. 0.65 V ≤ VCCB ≤ 3.6 V Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 3 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)(1) MIN MAX UNIT VCCA Supply voltage A –0.5 4.2 V VCCB Supply voltage B –0.5 4.2 V I/O Ports (A Port) –0.5 4.2 VI Input Voltage(2) I/O Ports (B Port) –0.5 4.2 Control Inputs –0.5 4.2 A Port –0.5 4.2 B Port –0.5 4.2 A Port –0.5 VCCA + 0.2 B Port –0.5 VCCB + 0.2 V VO Voltage applied to any output in the high-impedance or power-off state(2) VO Voltage applied to any output in the high or low state(2) (3) IIK Input clamp current VI < 0 –50 mA IOK Output clamp current VO < 0 –50 mA IO Continuous output current Continuous current through VCC or GND Tj Junction Temperature Tstg Storage temperature (1) (2) (3) V V –50 50 mA –100 100 mA 150 °C 150 °C –65 Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. The input voltage and output negative-voltage ratings may be exceeded if the input and output current ratings are observed. The output positive-voltage rating may be exceeded up to 4.2 V maximum if the output current rating is observed. 6.2 ESD Ratings VALUE V(ESD) (1) (2) 4 Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±8000 Charged device model (CDM), per JEDEC specification JESD22-C101(2) ±1000 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted)(1) (2) MIN MAX VCCA Supply voltage A 0.65 3.6 V VCCB Supply voltage B 0.65 3.6 V Data Inputs VCCI = 0.65 V - 0.75 V VCCI x 0.70 VCCI = 0.76 V - 1 V VCCI x 0.70 VCCI = 1.1 V - 1.95 V VCCI x 0.65 VCCI = 2.3 V - 2.7 V VIH 1.6 VCCI = 3 V - 3.6 V High-level input voltage Control Inputs(DIRx, OE), Referenced to VCCA 2 VCCA = 0.65 V - 0.75 V VCCA x 0.70 VCCA = 0.76 V - 1 V VCCA x 0.70 VCCA = 1.1 V - 1.95 V VCCA x 0.65 VCCA = 2.3 V - 2.7 V 1.6 VCCA = 3 V - 3.6 V Data Inputs 2 VCCI = 0.65 V - 0.75 V VCCI x 0.30 VCCI = 0.76 V - 1 V VCCI x 0.30 VCCI = 1.1 V - 1.95 V VCCI x 0.35 VCCI = 2.3 V - 2.7 V VIL 0.7 VCCI = 3 V - 3.6 V Low-level input voltage Control Inputs(DIRx, OE), Referenced to VCCA 0.8 VCCA = 0.65 V - 0.75 V VCCA x 0.30 VCCA = 0.76 V - 1 V VCCA x 0.30 VCCA = 1.1 V - 1.95 V VCCA x 0.35 VCCA = 2.3 V - 2.7 V 0.8 Input voltage (1) 0 3.6 Active State 0 VCCO Tri-State 0 3.6 10 ns/V –40 125 °C VO Output voltage Δt/Δv(2) Input transition rise and fall time TA Operating free-air temperature (1) (2) V 0.7 VCCA = 3 V - 3.6 V VI UNIT V V VCCI is the VCC associated with the input port.VCCO is the VCC associated with the output port. 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, SCBA004. 6.4 Thermal Information SN74AXC4T774 THERMAL METRIC(1) PW (TSSOP) RSV (UQFN) BQB (WQFN) UNIT 16 PINS 16 PINS 16 PINS RθJA Junction-to-ambient thermal resistance 118.2 130.8 73.7 °C/W RθJC(top) Junction-to-case (top) thermal resistance 48.6 69.1 70.9 °C/W RθJB Junction-to-board thermal resistance 64.5 59.9 43.5 °C/W YJT Junction-to-top characterization parameter 7.3 3.9 4.9 °C/W YJB Junction-to-board characterization parameter 63.9 58.3 43.5 °C/W RθJC(bottom) Junction-to-case (bottom) thermal resistance NA NA 21.2 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 5 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 6.5 Electrical Characteristics over operating free-air temperature range (unless otherwise noted) (1) (2) Operating free-air temperature (TA) PARAMETER TEST CONDITIONS VCCA VCCB -40°C to 85°C MIN TYP(4) VOH VOL II Low-level output VI = VIL voltage Input leakage current MIN TYP(4) MAX VCCO – 0.1 VCCO – 0.1 0.65 V 0.55 0.55 0.76 V 0.58 0.58 0.85 V 0.85 V 0.65 0.65 IOH = -3 mA 1.1 V 1.1 V 0.85 0.85 IOH = -6 mA 1.4 V 1.4 V 1.05 1.05 IOH = -8 mA 1.65 V 1.65 V 1.2 1.2 IOH = -9 mA 2.3 V 2.3 V 1.75 1.75 IOH = -12 mA 3V 3V IOL = 100 µA 0.7 V - 3.6 V 0.7 V - 3.6 V IOL = 50 µA 0.65 V 0.65 V 0.1 0.1 IOL = 200 µA 0.76 V 0.76 V 0.18 0.18 IOL = 500 µA 0.85 V 0.85 V 0.2 0.2 IOL = 3 mA 1.1 V 1.1 V 0.25 0.25 IOL = 6 mA 1.4 V 1.4 V 0.35 0.35 IOL = 8 mA 1.65 V 1.65 V 0.45 0.45 IOL = 9 mA 2.3 V 2.3 V 0.55 0.55 IOL = 12 mA 3V 3V 0.7 0.7 IOH = -100 µA 0.7 V - 3.6 V 0.7 V - 3.6 V IOH = -50 µA 0.65 V IOH = -200 µA 0.76 V IOH = -500 µA 2.3 V 2.3 0.1 0.1 0.65 V- 3.6 V –0.5 0.5 –1 1 µA Data Inputs (Ax, Bx),VI = VCCI or GND 0.65 V- 3.6 V 0.65 V- 3.6 V –4 4 –8 8 µA Partial power down current A Port: VI or VO = 0 V - 3.6 V 0V 0 V - 3.6 V –4 4 –8 8 B Port: VI or VO = 0 V - 3.6 V 0 V - 3.6 V 0V –4 4 –8 8 IOZ Tri-state output current (3) A or B Port, VI = VCCI or GND, 3.6 V VO = VCCO or GND, OE = VIH 3.6 V –4 4 –8 8 ICCA VCCA supply current VI = VCCI or GND VCCB supply current V Control inputs (DIRx, OE):VI = 0.65 V- 3.6 V VCCA or GND Ioff ICCB VI = VCCI or GND IO = 0 IO = 0 0.65 V- 3.6 V 0.65 V- 3.6 V 0V 3.6 V 15 3.6 V 0V 10 18 0.65 V- 3.6 V 0.65 V- 3.6 V 15 27 0V 3.6 V 3.6 V 0V 0.65 V- 3.6 V 0.65 V- 3.6 V –2 µA 27 µA –12 10 –2 µA 18 µA 40 µA –12 ICCA + ICCB Combined supply current VI = VCCI or GND Ci Control Input Capacitance VI = 3.3 V or GND 3.3 V 3.3 V 4.5 4.5 pF Cio Data I/O Capacitance OE = VCCA, VO = 1.65V DC +1 3.3 V MHz -16 dBm sine wave 3.3 V 6.5 6.5 pF (1) (2) (3) (4) 6 High-level output VI = VIH voltage UNIT -40°C to 125°C MAX IO = 0 21 VCCI is the VCC associated with the input port. VCCO is the VCC associated with the output port. For I/O ports, the parameter IOZ includes the input leakage current. All typical data is taken at 25°C. Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 6.6 Switching Characteristics, VCCA = 0.7 ± 0.05 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B A OE tdis A Disable time OE OE ten TO B A Enable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V UNIT 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 172 0.5 120 0.5 88 0.5 51 0.5 46 0.5 56 0.5 78 0.5 221 -40°C to 125°C 0.5 172 0.5 120 0.5 88 0.5 51 0.5 46 0.5 56 0.5 78 0.5 221 -40°C to 85°C 0.5 172 0.5 141 0.5 109 0.5 51 0.5 16 0.5 12 0.5 9 0.5 9 -40°C to 125°C 0.5 172 0.5 141 0.5 109 0.5 51 0.5 16 0.5 12 0.5 9 0.5 9 -40°C to 85°C 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 -40°C to 125°C 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 -40°C to 85°C 0.5 189 0.5 161 0.5 145 0.5 102 0.5 99 0.5 102 0.5 113 0.5 176 -40°C to 125°C 0.5 189 0.5 161 0.5 145 0.5 102 0.5 99 0.5 102 0.5 113 0.5 176 -40°C to 85°C 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 -40°C to 125°C 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 -40°C to 85°C 0.5 309 0.5 219 0.5 177 0.5 133 0.5 127 0.5 132 0.5 165 0.5 418 -40°C to 125°C 0.5 309 0.5 219 0.5 177 0.5 133 0.5 127 0.5 132 0.5 165 0.5 418 ns ns ns 6.7 Switching Characteristics, VCCA = 0.8 ± 0.04 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B OE tdis TO A A Disable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 141 0.5 96 0.5 73 0.5 39 0.5 29 0.5 28 0.5 29 0.5 40 -40°C to 125°C 0.5 141 0.5 96 0.5 73 0.5 39 0.5 29 0.5 28 0.5 29 0.5 40 -40°C to 85°C 0.5 120 0.5 96 0.5 76 0.5 39 0.5 16 0.5 11 0.5 9 0.5 9 -40°C to 125°C 0.5 120 0.5 96 0.5 76 0.5 39 0.5 16 0.5 12 0.5 9 0.5 9 -40°C to 85°C 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 -40°C to 125°C 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 -40°C to 85°C 0.5 156 0.5 131 0.5 116 0.5 71 0.5 67 0.5 68 0.5 70 0.5 84 -40°C to 125°C 0.5 156 0.5 131 0.5 116 0.5 71 0.5 67 0.5 68 0.5 70 0.5 84 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 ns ns 7 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM OE ten TO A Enable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 -40°C to 125°C 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 -40°C to 85°C 0.5 258 0.5 174 0.5 137 0.5 90 0.5 73 0.5 71 0.5 77 0.5 106 -40°C to 125°C 0.5 258 0.5 174 0.5 137 0.5 90 0.5 73 0.5 71 0.5 77 0.5 106 ns 6.8 Switching Characteristics, VCCA = 0.9 ± 0.045 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis ten B Propagation delay B A OE A Disable time OE B OE A Enable time OE 8 TO B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V UNIT 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 109 0.5 76 0.5 60 0.5 33 0.5 23 0.5 21 0.5 21 0.5 24 -40°C to 125°C 0.5 109 0.5 76 0.5 60 0.5 33 0.5 23 0.5 21 0.5 21 0.5 24 -40°C to 85°C 0.5 88 0.5 73 0.5 60 0.5 33 0.5 16 0.5 11 0.5 9 0.5 9 -40°C to 125°C 0.5 88 0.5 73 0.5 60 0.5 33 0.5 16 0.5 12 0.5 9 0.5 9 -40°C to 85°C 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 -40°C to 125°C 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 -40°C to 85°C 0.5 138 0.5 112 0.5 97 0.5 51 0.5 46 0.5 46 0.5 46 0.5 54 -40°C to 125°C 0.5 138 0.5 112 0.5 97 0.5 51 0.5 46 0.5 46 0.5 46 0.5 54 -40°C to 85°C 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 -40°C to 125°C 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 -40°C to 85°C 0.5 203 0.5 140 0.5 110 0.5 70 0.5 52 0.5 45 0.5 43 0.5 51 -40°C to 125°C 0.5 203 0.5 140 0.5 110 0.5 74 0.5 54 0.5 47 0.5 43 0.5 51 Submit Document Feedback ns ns ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 6.9 Switching Characteristics, VCCA = 1.2 ± 0.1 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B A OE tdis A Disable time OE OE ten TO B A Enable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V UNIT 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 50 0.5 39 0.5 33 0.5 20 0.5 14 0.5 12 0.5 10 0.5 12 -40°C to 125°C 0.5 50 0.5 39 0.5 33 0.5 20 0.5 14 0.5 12 0.5 10 0.5 12 -40°C to 85°C 0.5 51 0.5 39 0.5 33 0.5 20 0.5 15 0.5 11 0.5 8 0.5 7 -40°C to 125°C 0.5 51 0.5 39 0.5 33 0.5 20 0.5 15 0.5 12 0.5 8 0.5 7 -40°C to 85°C 0.5 28 0.5 28 0.5 28 0.5 28 0.5 28 0.5 28 0.5 28 0.5 28 -40°C to 125°C 0.5 29 0.5 29 0.5 29 0.5 29 0.5 29 0.5 29 0.5 29 0.5 29 -40°C to 85°C 0.5 123 0.5 95 0.5 78 0.5 33 0.5 26 0.5 25 0.5 23 0.5 26 -40°C to 125°C 0.5 124 0.5 95 0.5 79 0.5 34 0.5 27 0.5 26 0.5 24 0.5 26 -40°C to 85°C 0.5 39 0.5 39 0.5 39 0.5 39 0.5 39 0.5 39 0.5 39 0.5 39 -40°C to 125°C 0.5 40 0.5 40 0.5 40 0.5 40 0.5 40 0.5 40 0.5 40 0.5 40 -40°C to 85°C 0.5 124 0.5 87 0.5 70 0.5 51 0.5 38 0.5 33 0.5 26 0.5 25 -40°C to 125°C 0.5 124 0.5 87 0.5 70 0.5 55 0.5 42 0.5 36 0.5 28 0.5 26 ns ns ns 6.10 Switching Characteristics, VCCA = 1.5 ± 0.1 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B OE tdis TO A A Disable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 16 0.5 16 0.5 16 0.5 15 0.5 11 0.5 10 0.5 8 0.5 10 -40°C to 125°C 0.5 16 0.5 16 0.5 16 0.5 15 0.5 11 0.5 10 0.5 8 0.5 10 -40°C to 85°C 0.5 47 0.5 29 0.5 23 0.5 14 0.5 11 0.5 9 0.5 7 0.5 6 -40°C to 125°C 0.5 47 0.5 29 0.5 23 0.5 14 0.5 11 0.5 9 0.5 7 0.5 6 -40°C to 85°C 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 -40°C to 125°C 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 -40°C to 85°C 0.5 120 0.5 91 0.5 74 0.5 29 0.5 22 0.5 20 0.5 20 0.5 20 -40°C to 125°C 0.5 120 0.5 92 0.5 75 0.5 30 0.5 23 0.5 22 0.5 19 0.5 20 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 ns ns 9 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM OE ten TO A Enable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 24 0.5 24 0.5 24 0.5 24 0.5 24 0.5 24 0.5 24 0.5 24 -40°C to 125°C 0.5 25 0.5 25 0.5 25 0.5 25 0.5 25 0.5 25 0.5 25 0.5 25 -40°C to 85°C 0.5 28 0.5 29 0.5 33 0.5 41 0.5 31 0.5 27 0.5 22 0.5 19 -40°C to 125°C 0.5 29 0.5 30 0.5 33 0.5 42 0.5 33 0.5 29 0.5 24 0.5 21 ns 6.11 Switching Characteristics, VCCA = 1.8 ± 0.15 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis ten B Propagation delay B A OE A Disable time OE B OE A Enable time OE 10 TO B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V MIN MAX MIN -40°C to 85°C 0.5 12 -40°C to 125°C 0.5 12 -40°C to 85°C 0.5 -40°C to 125°C 0.9 ± 0.045 V MAX MIN 0.5 11 0.5 12 56 0.5 0.5 56 -40°C to 85°C 0.5 -40°C to 125°C 0.5 -40°C to 85°C 1.2 ± 0.1 V MAX MIN 0.5 11 0.5 12 28 0.5 0.5 28 17 0.5 18 0.5 0.5 117 -40°C to 125°C 0.5 -40°C to 85°C -40°C to 125°C 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V UNIT 3.3 ± 0.3 V MAX MIN MAX MIN MAX MIN MAX MIN MAX 0.5 11 0.5 9 0.5 8 0.5 7 0.5 7 0.5 12 0.5 9 0.5 9 0.5 7 0.5 7 21 0.5 12 0.5 10 0.5 8 0.5 6 0.5 5 0.5 21 0.5 12 0.5 10 0.5 9 0.5 7 0.5 6 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 90 0.5 73 0.5 28 0.5 21 0.5 19 0.5 16 0.5 18 119 0.5 90 0.5 74 0.5 29 0.5 22 0.5 20 0.5 17 0.5 18 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 -40°C to 85°C 0.5 21 0.5 20 0.5 20 0.5 32 0.5 27 0.5 24 0.5 20 0.5 18 -40°C to 125°C 0.5 22 0.5 22 0.5 22 0.5 34 0.5 29 0.5 26 0.5 22 0.5 19 Submit Document Feedback ns ns ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 6.12 Switching Characteristics, VCCA = 2.5 ± 0.2 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B A OE tdis A Disable time OE OE ten TO B A Enable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V UNIT 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 10 0.5 10 0.5 9 0.5 8 0.5 7 0.5 6 0.5 6 0.5 6 -40°C to 125°C 0.5 10 0.5 10 0.5 9 0.5 8 0.5 7 0.5 7 0.5 6 0.5 6 -40°C to 85°C 0.5 78 0.5 30 0.5 21 0.5 10 0.5 8 0.5 7 0.5 6 0.5 5 -40°C to 125°C 0.5 78 0.5 30 0.5 21 0.5 10 0.5 8 0.5 7 0.5 6 0.5 5 -40°C to 85°C 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 -40°C to 125°C 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 -40°C to 85°C 0.5 115 0.5 89 0.5 72 0.5 26 0.5 19 0.5 18 0.5 14 0.5 17 -40°C to 125°C 0.5 117 0.5 89 0.5 72 0.5 28 0.5 21 0.5 19 0.5 15 0.5 17 -40°C to 85°C 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 -40°C to 125°C 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 -40°C to 85°C 0.5 15 0.5 14 0.5 13 0.5 14 0.5 15 0.5 16 0.5 15 0.5 15 -40°C to 125°C 0.5 16 0.5 15 0.5 15 0.5 16 0.5 17 0.5 18 0.5 17 0.5 16 ns ns ns 6.13 Switching Characteristics, VCCA = 3.3 ± 0.3 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B OE tdis TO A A Disable time OE B Test Condtions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 10 0.5 9 0.5 9 0.5 8 0.5 6 0.5 6 0.5 5 0.5 5 -40°C to 125°C 0.5 10 0.5 9 0.5 9 0.5 8 0.5 6 0.5 6 0.5 5 0.5 5 -40°C to 85°C 0.5 221 0.5 40 0.5 24 0.5 12 0.5 10 0.5 7 0.5 6 0.5 5 -40°C to 125°C 0.5 221 0.5 40 0.5 24 0.5 12 0.5 10 0.5 7 0.5 6 0.5 5 -40°C to 85°C 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 -40°C to 125°C 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 -40°C to 85°C 0.5 115 0.5 89 0.5 72 0.5 26 0.5 19 0.5 17 0.5 14 0.5 16 -40°C to 125°C 0.5 117 0.5 89 0.5 72 0.5 27 0.5 20 0.5 18 0.5 14 0.5 16 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 ns ns 11 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM OE ten A Enable time OE 12 TO B Test Condtions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 -40°C to 125°C 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 -40°C to 85°C 0.5 13 0.5 12 0.5 11 0.5 11 0.5 11 0.5 12 0.5 12 0.5 12 -40°C to 125°C 0.5 14 0.5 12 0.5 12 0.5 12 0.5 12 0.5 13 0.5 13 0.5 13 Submit Document Feedback UNIT ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 6.14 Operating Characteristics: TA = 25°C PARAMETER Power Dissipation Capacitance per transceiver (A to B: outputs enabled) Power Dissipation Capacitance per transceiver (A to B: outputs disabled) TEST CONDITIONS CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CpdA Power Dissipation Capacitance per transceiver (B to A: outputs enabled) Power Dissipation Capacitance per transceiver (B to A: outputs disabled) CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns VCCA VCCB MIN TYP 0.7 V 0.7 V 2.4 0.8 V 0.8 V 2.3 0.9 V 0.9 V 2.2 1.2 V 1.2 V 2.2 1.5 V 1.5 V 2.2 1.8 V 1.8 V 2.2 2.5 V 2.5 V 2.4 3.3 V 3.3 V 3.0 0.7 V 0.7 V 1.5 0.8 V 0.8 V 1.5 0.9 V 0.9 V 1.5 1.2 V 1.2 V 1.5 1.5 V 1.5 V 1.5 1.8 V 1.8 V 1.5 2.5 V 2.5 V 1.6 3.3 V 3.3 V 2.0 0.7 V 0.7 V 13.4 0.8 V 0.8 V 15.0 0.9 V 0.9 V 14.0 1.2 V 1.2 V 20.7 1.5 V 1.5 V 29.6 1.8 V 1.8 V 40.2 2.5 V 2.5 V 65.8 3.3 V 3.3 V 91.7 0.7 V 0.7 V 1.3 0.8 V 0.8 V 1.1 0.9 V 0.9 V 1.1 1.2 V 1.2 V 1.0 1.5 V 1.5 V 1.0 1.8 V 1.8 V 1.0 2.5 V 2.5 V 1.0 3.3 V 3.3 V 1.0 MAX UNIT pF pF pF pF Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 13 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 PARAMETER Power Dissipation Capacitance per transceiver (A to B: outputs enabled) Power Dissipation Capacitance per transceiver (A to B: outputs disabled) TEST CONDITIONS CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CpdB Power Dissipation Capacitance per transceiver (B to A: outputs enabled) Power Dissipation Capacitance per transceiver (B to A: outputs disabled) 14 CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns VCCA VCCB MIN TYP 0.7 V 0.7 V 13.4 0.8 V 0.8 V 13.8 0.9 V 0.9 V 14.9 1.2 V 1.2 V 20.6 1.5 V 1.5 V 29.6 1.8 V 1.8 V 40.3 2.5 V 2.5 V 66.2 3.3 V 3.3 V 92.5 0.7 V 0.7 V 1.3 0.8 V 0.8 V 1.2 0.9 V 0.9 V 1.1 1.2 V 1.2 V 1.1 1.5 V 1.5 V 1.1 1.8 V 1.8 V 1.1 2.5 V 2.5 V 1.1 3.3 V 3.3 V 1.1 0.7 V 0.7 V 2.5 0.8 V 0.8 V 2.4 0.9 V 0.9 V 2.3 1.2 V 1.2 V 2.2 1.5 V 1.5 V 2.3 1.8 V 1.8 V 2.3 2.5 V 2.5 V 2.5 3.3 V 3.3 V 3.0 0.7 V 0.7 V 1.6 0.8 V 0.8 V 1.5 0.9 V 0.9 V 1.5 1.2 V 1.2 V 1.5 1.5 V 1.5 V 1.5 1.8 V 1.8 V 1.5 2.5 V 2.5 V 1.6 3.3 V 3.3 V 2.0 Submit Document Feedback MAX UNIT pF pF pF pF Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 6.15 Typical Characteristics 3.4 VCC = 1.8V VCC = 2.5V VCC = 3.3V 3.2 3 2.6 VOH (V) VOH (V) 2.8 2.4 2.2 2 1.8 1.6 1.4 0 2 4 6 8 10 12 IOH (mA) 14 16 18 1.25 1.2 1.15 1.1 1.05 1 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 VCC = 0.7V VCC = 1.2V 0 20 0.5 1 1.5 2 D001 2.5 3 IOH (mA) 3.5 4 4.5 5 D001 220 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 -50 200 180 160 140 VOL (mV) VOL (mV) 图 6-1. Typical (TA=25°C) Output High Voltage (VOH) 图 6-2. Typical (TA=25°C) Output High Voltage (VOH) vs Source Current (IOH) vs Source Current (IOH) 120 100 80 60 40 VCC = 1.8V VCC = 2.5V VCC = 3.3V VCC = 0.7V VCC = 1.2V 20 0 0 2 4 6 8 10 12 IOL (mA) 14 16 18 20 0 0.5 D001 1 1.5 2 2.5 3 IOL (mA) 3.5 4 4.5 5 D001 图 6-3. Typical (TA=25°C) Output High Voltage (VOL) 图 6-4. Typical (TA=25°C) Output High Voltage (VOL) vs Sink Current (IOL) vs Sink Current (IOL) Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 15 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 7 Parameter Measurement Information 7.1 Load Circuit and Voltage Waveforms Unless otherwise noted, all input pulses are supplied by generators having the following characteristics: • f = 1 MHz • ZO = 50 Ω • dv/dt ≤ 1 ns/V Measurement Point 2 x VCCO S1 RL Open Output Pin Under Test GND CL(1) A. RL CL includes probe and jig capacitance. 图 7-1. Load Circuit 表 7-1. Load Circuit Conditions Parameter VCCO RL CL S1 VTP Δt/ Δv Input transition rise or fall rate 0.65 V – 3.6 V 1 MΩ 15 pF Open N/A 1.1 V – 3.6 V 2 kΩ 15 pF Open N/A tpd Propagation (delay) time 0.65 V – 0.95 V 20 kΩ 15 pF Open N/A 3 V – 3.6 V 2 kΩ 15 pF 2 × VCCO 0.3 V 1.65 V – 2.7 V 2 kΩ 15 pF 2 × VCCO 0.15 V ten, tdis Enable time, disable time ten, tdis Enable time, disable time 1.1 V – 1.6 V 2 kΩ 15 pF 2 × VCCO 0.1 V 0.65 V – 0.95 V 20 kΩ 15 pF 2 × VCCO 0.1 V 3 V – 3.6 V 2 kΩ 15 pF GND 0.3 V 1.65 V – 2.7 V 2 kΩ 15 pF GND 0.15 V 1.1 V – 1.6 V 2 kΩ 15 pF GND 0.1 V 0.65 V – 0.95 V 20 kΩ 15 pF GND 0.1 V VCCI(1) VCCI(1) Input A, B Input A, B VCCI / 2 VCCI / 2 500 ps/V ± 10 ns/V 0V VOH(2) VCCI / 2 Output B, A VCCI / 2 VOL(2) 1. 2. 0V VOH(2) tpd tpd Output B, A 100 kHz VCCI is the supply pin associated with the input port. VOH and VOL are typical output voltage levels that occur with specified RL, CL, and S1 1. 2. Ensure Monotonic Rising and Falling Edge VOL(2) VCCI is the supply pin associated with the input port. VOH and VOL are typical output voltage levels that occur with specified RL, CL, and S1 图 7-3. Input Transition Rise or Fall Rate 图 7-2. Propagation Delay 16 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 VCCA OE VCCA / 2 VCCA / 2 GND tdis ten VCCO(3) Output(1) VCCO / 2 VOL + VTP VOL(4) VOH(4) VOH - VTP Output(2) VCCO / 2 GND A. B. C. D. Output waveform on the condition that input is driven to a valid Logic Low. Output waveform on the condition that input is driven to a valid Logic High. VCCO is the supply pin associated with the output port. VOH and VOL are typical output voltage levels with specified RL, CL, and S1. 图 7-4. Enable Time And Disable Time Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 17 SN74AXC4T774 www.ti.com.cn ZHCSK02B – JULY 2019 – REVISED MAY 2021 8 Detailed Description 8.1 Overview The SN74AXC4T774 is a 4-bit, dual-supply noninverting bidirectional voltage level translation device. Ax pins and control pins (DIRx and OE) are reference to VCCA logic levels, and Bx pins are referenced to VCCB logic levels. The A port is able to accept I/O voltages ranging from 0.65 V to 3.6 V, while the B port can accept I/O voltages from 0.65 V to 3.6 V. A high on DIR allows data transmission from A to B and a low on DIR allows data transmission from B to A when OE is set to low. When OE is set to high, both Ax and Bx pins are in the highimpedance state. See Device Functional Modes for a summary of the operation of the control logic. 8.2 Functional Block Diagram One of Four Transceivers VCCA VCCB DIRx OE Bx Ax 8.3 Feature Description 8.3.1 Standard CMOS Inputs Standard CMOS inputs are high impedance and are typically modeled as a resistor in parallel with the input capacitance given in the Electrical Characteristics. The worst case resistance is calculated with the maximum input voltage, given in the Absolute Maximum Ratings, and the maximum input leakage current, given in the Electrical Characteristics, using ohm's law (R = V ÷ I). Signals applied to the inputs need to have fast edge rates, as defined by Δt/Δv in Recommended Operating Conditions to avoid excessive current consumption and oscillations. If a slow or noisy input signal is required, a device with a Schmitt-trigger input should be used to condition the input signal prior to the standard CMOS input. 8.3.2 Balanced High-Drive CMOS Push-Pull Outputs A balanced output allows the device to sink and source similar currents. The high drive capability of this device creates fast edges into light loads so routing and load conditions should be considered to prevent ringing. Additionally, the outputs of this device are capable of driving larger currents than the device can sustain without being damaged. The electrical and thermal limits defined in the Absolute Maximum Ratings must be followed at all times. 8.3.3 Partial Power Down (Ioff) The inputs and outputs for this device enter a high-impedance state when the device is powered down, inhibiting current backflow into the device. The maximum leakage into or out of any input or output pin on the device is specified by Ioff in the Electrical Characteristics. 8.3.4 VCC Isolation The inputs and outputs for this device enter a high-impedance state when either supply is