The TRS3238E 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. This device operates at data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew rate.

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 400 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
• Accepts 5-V Logic Input With 3.3-V Supply
• Always-Active Noninverting Receiver Output (ROUT1B)
• Alternative High-Speed Pin-Compatible Device (1 Mbit/s) for TRSF3238
• 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)
• 400
• Main supply voltage (Nom) (V)
• 3.3, 5
• Features
• Auto-Powerdown
• ESD HBM (kV)
• 15
• Rating
• Catalog
• Operating temperature range (C)
• -40 to 85, 0 to 70
• Vout (Typ) (V)
• 5.4

TRS3238E的完整型号有：TRS3238ECDB、TRS3238ECDBR、TRS3238ECPWR、TRS3238EIDB、TRS3238EIDBR、TRS3238EIPW、TRS3238EIPWR，以下是这些产品的关键参数及官网采购报价：

TRS3238ECDB，工作温度：0 to 70，封装：SSOP (DB)-28，包装数量MPQ：50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TRS3238ECDB的批量USD价格：1.07（1000+）

TRS3238ECDBR，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TRS3238ECDBR的批量USD价格：.892（1000+）

TRS3238ECPWR，工作温度：0 to 70，封装：TSSOP (PW)-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TRS3238ECPWR的批量USD价格：.892（1000+）

TRS3238EIDB，工作温度：-40 to 85，封装：SSOP (DB)-28，包装数量MPQ：50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TRS3238EIDB的批量USD价格：1.16（1000+）

TRS3238EIDBR，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TRS3238EIDBR的批量USD价格：.981（1000+）

TRS3238EIPW，工作温度：-40 to 85，封装：TSSOP (PW)-28，包装数量MPQ：50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TRS3238EIPW的批量USD价格：1.16（1000+）

TRS3238EIPWR，工作温度：-40 to 85，封装：TSSOP (PW)-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TRS3238EIPWR的批量USD价格：.981（1000+）

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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。

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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”。

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