The TRSF23243 consists of two ports, each containing three line drivers and five line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). This device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. This combination of drivers and receivers matches that needed for two typical serial ports used in an IBM PC/AT, or compatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, this device includes an always-active noninverting output (ROUT2) per port, which allows applications using the ring indicator to transmit data while the device is powered down. The 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 available when either or both serial ports are inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs of its respective port are disabled. If FORCEOFF is set low, both drivers and receivers (except ROUT2) are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur.

Auto-powerdown can be disabled when FORCEON and FORCEOFF are high and should be done when driving a serial mouse. With auto-powerdown enabled, the RS-232 port is activated automatically when a valid signal is applied to any respective receiver input. The INV output is used to notify the user if an RS-232 signal is present at any receiver input. INV 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. INV is low (invalid data) if all receiver input voltages are between -0.3 V and 0.3 V for more than 30 µs.

• Single-Chip and Single-Supply Interface for Two IBM PC/AT Serial Ports
• 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
• Always-Active Noninverting Receiver Output (ROUT2) Per Port
• Operates Up To 250 kbit/s
• Low Standby Current . . . 1 μA Typical
• External Capacitors . . . 4 × 0.22 μF
• Accepts 5-V Logic Input With 3.3-V Supply
• Allows for Flexible Power Down of Either Serial Port
• Serial-Mouse Driveability
• RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)
• APPLICATIONS
  • Battery-Powered Systems
  • Notebooks
  • Laptops
  • Palmtop PCs
  • Hand-Held Equipment

• Drivers per package
• 6
• Receivers per package
• 10
• Logic voltage (Min) (V)
• 3.3
• Data rate (Max) (kbps)
• 250
• Main supply voltage (Nom) (V)
• 3.3, 5
• Features
• Auto-Powerdown
• ESD HBM (kV)
• 15
• Rating
• Catalog
• Operating temperature range (C)
• 0 to 70
• Vout (Typ) (V)
• 5.4

TRSF23243的完整型号有：TRSF23243CDGGR、TRSF23243CDLR，以下是这些产品的关键参数及官网采购报价：

TRSF23243CDGGR，工作温度：0 to 70，封装：TSSOP (DGG)-48，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TRSF23243CDGGR的批量USD价格：1.518（1000+）

TRSF23243CDLR，工作温度：0 to 70，封装：SSOP (DL)-48，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TRSF23243CDLR的批量USD价格：1.38（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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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。

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