The SN65C3243 and SN75C3243 consist of three line drivers, 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 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 a single 3-V to 5.5-V supply. In addition, this device includes an always-active noninverting output (ROUT2B), 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 1 Mbit/s and an increased slew-rate range of 24 V/µs to 150 V/µs.

Flexible control options for power management are available when the serial port is 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 are disabled. If FORCEOFF is set low, both drivers and receivers (except ROUT2B) 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 device is activated automatically when a valid signal is applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any receiver 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. Refer to Figure 5 for receiver input levels.

• Operates With 3-V to 5.5-V VCC Supply
• Always-Active Noninverting Receiver Output (ROUT2B)
• Low Standby Current . . . 1 μA Typ
• External Capacitors . . . 4 × 0.1 μF
• Accepts 5-V Logic Input With 3.3-V Supply
• Inter-Operable With SN65C3238, SN75C3238
• Supports Operation From 250 kbit/s to 1 Mbit/s
• RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• APPLICATIONS
  • Battery-Powered Systems
  • PDAs
  • Notebooks
  • Laptops
  • Palmtop PCs
  • Hand-Held Equipment

• Drivers per package
• 3
• Receivers per package
• 5
• Logic voltage (Min) (V)
• 3.3
• Data rate (Max) (kbps)
• 1000
• 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

SN75C3243的完整型号有：SN75C3243DBR、SN75C3243DW、SN75C3243DWR、SN75C3243PW、SN75C3243PWR，以下是这些产品的关键参数及官网采购报价：

SN75C3243DBR，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SN75C3243DBR的批量USD价格：.92（1000+）

SN75C3243DW，工作温度：0 to 70，封装：SOIC (DW)-28，包装数量MPQ：20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SN75C3243DW的批量USD价格：1.104（1000+）

SN75C3243DWR，工作温度：0 to 70，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SN75C3243DWR的批量USD价格：.92（1000+）

SN75C3243PW，工作温度：0 to 70，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SN75C3243PW的批量USD价格：1.104（1000+）

SN75C3243PWR，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SN75C3243PWR的批量USD价格：.92（1000+）

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