The TRSF3238E consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM) protection on the driver output (DOUT) and receiver input (RIN) terminals. The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between notebook and subnotebook computer applications. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting output (ROUT1B), which allows applications using the ring indicator to transmit data while the device is powered down. The TRSF3238E operates at data signaling rates up to 1000 kbit/s.

Flexible control options for power management are featured when the serial port and driver inputs are inactive. The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 µA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus occurs if there is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown plus enabled, the device activates automatically when a valid signal is applied to any receiver or driver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than -2.7 V, or has been between -0.3 V and 0.3 V for less than 30 µs. INVALID is low (invalid data) if all receiver input voltages are between -0.3 V and 0.3 V for more than 30 µs.

• RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)
• Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 Standards
• Operates With 3-V to 5.5-V VCC Supply
• Operates up to 1000 kbit/s
• Five Drivers and Three Receivers
• Auto-Powerdown Plus Feature Enables Flexible Power-Down Mode
• Low Standby Current . . . 1 μA Typical
• External Capacitors . . . 4 × 0.1 μF
• Accept 5-V Logic Input With 3.3-V Supply
• Always-Active Noninverting Receiver Output (ROUT1B)
• ESD Protection for RS-232 Interface Pins
  • ±15-kV Human-Body Model (HBM)
  • ±8-kV IEC61000-4-2, Contact Discharge
  • ±15-kV IEC61000-4-2, Air-Gap Discharge
• APPLICATIONS
  • Battery-Powered Systems
  • PDAs
  • Notebooks
  • Subnotebooks
  • Laptops
  • Palmtop PCs
  • Hand-Held Equipment
  • Modems
  • Printers

• Drivers per package
• 5
• Receivers per package
• 3
• Logic voltage (Min) (V)
• 3.3
• Data rate (Max) (kbps)
• 1000
• Main supply voltage (Nom) (V)
• 3.3, 5
• Features
• Auto-Powerdown Plus
• ESD HBM (kV)
• 15
• Rating
• Catalog
• Operating temperature range (C)
• -40 to 85, 0 to 70
• Vout (Typ) (V)
• 5.4

TRSF3238E的完整型号有：TRSF3238ECDBR、TRSF3238EIDBR、TRSF3238EIDWR，以下是这些产品的关键参数及官网采购报价：

TRSF3238ECDBR，工作温度：0 to 70，封装：SSOP (DB)-28，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网TRSF3238ECDBR的批量USD价格：1.132（1000+）

TRSF3238EIDBR，工作温度：-40 to 85，封装：SSOP (DB)-28，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网TRSF3238EIDBR的批量USD价格：1.245（1000+）

TRSF3238EIDWR，工作温度：-40 to 85，封装：SOIC (DW)-28，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网TRSF3238EIDWR的批量USD价格：1.245（1000+）

PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice

PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助?PSpice for TI 的设计和仿真环境及其内置的模型库，您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案，然后再进行布局和制造，可缩短产品上市时间并降低开发成本。

在?PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)

TINA-TI — 基于 SPICE 的模拟仿真程序

TINA-TI 提供了 SPICE 所有的传统直流、瞬态和频域分析以及更多。TINA 具有广泛的后处理功能，允许您按照希望的方式设置结果的格式。虚拟仪器允许您选择输入波形、探针电路节点电压和波形。TINA 的原理图捕获非常直观 - 真正的“快速入门”。

TINA-TI 安装需要大约 500MB。直接安装，如果想卸载也很容易。我们相信您肯定会爱不释手。

TINA 是德州仪器 (TI) 专有的 DesignSoft 产品。该免费版本具有完整的功能，但不支持完整版 TINA 所提供的某些其他功能。

如需获取可用 TINA-TI 模型的完整列表，请参阅：SpiceRack - 完整列表

需要 HSpice (...)

TIDA-00557 — 用于智能电网和变电站自动化的全调制解调器控制（8 线 RS232）模块参考设计

TIDA-00557 参考设计为采用 DB-9 插接式连接器的数据终端设备 (DTE) 提供一个接口作为真正的 RS-232（八路信号 + 接地）物理层接口，同时还支持数据通信设备 (DCE) 接口。此设计适用于智能电网 IED、保护继电器和变电站自动化领域。此设计满足 IEC61000-4-2 规定的 +-/ 8kV 接触放电 ESD 保护和 IEC61000-4-5 规定的 +/-1kV 浪涌保护。