The TRS3221 device consists of one line driver, one line receiver with dedicated enable pin, and a dual charge-pump circuit with ±15-kV ESD protection pin-to-pin (serial-port connection pins, including GND). The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from one 3-V to 5.5-V supply. The TRS3221 device operates at data signaling rates up to 250 kbps and a maximum of 30-V/µs driver output slew rate.

Flexible control options for power management are available when the serial port is inactive. The automatic power-down 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 on the receiver input, the driver output is disabled and the supply current is reduced to 1 µA. The INVALID output notifies the user if an RS-232 signal is present at the receiver input.

• 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 250 kbps
• One Driver and One Receiver
• Low Standby Current: 1-μA Typical
• External Capacitors: 4 × 0.1 μF
• Accepts 5-V Logic Input With 3.3-V Supply
• Alternative High-Speed Pin-Compatible Device (1 Mbps)
  • SNx5C3221
• Automatic Power-Down Feature Automatically Disables Drivers for Power Savings

• Drivers per package
• 1
• Receivers per package
• 1
• 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)
• -40 to 85
• Vout (Typ) (V)
• 5.4

TRS3221的完整型号有：TRS3221IPWR，以下是这些产品的关键参数及官网采购报价：

TRS3221IPWR，工作温度：-40 to 85，封装：TSSOP (PW)-16，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TRS3221IPWR的批量USD价格：.57（1000+）

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TINA-TI — 基于 SPICE 的模拟仿真程序

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