SN75C3243 - 3V 至 5.5V 多通道 RS-232 线路驱动器/接收器

SN75C3243是TI德州仪器公司的一款无产品，SN75C3243是3V 至 5.5V 多通道 RS-232 线路驱动器/接收器，本站介绍了SN75C3243的封装应用图解、特点和优点、功能等，并给出了与SN75C3243相关的TI元器件型号供参考。

SN75C3243 - 3V 至 5.5V 多通道 RS-232 线路驱动器/接收器 - 无 - RS-232收发器 - 德州仪器

产品描述

产品特性

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

DESCRIPTION/ORDERING INFORMATION

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.

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