SP202ECN-L

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1. Description

The SP202ECN-L , SP232E and SP233E devices are a family of line driver and receiver pairs that meets the specifications of RS-232 and V.28 serial protocols. The devices are pin-to-pin compatible with MaxLinear’s SP232A and SP233A devices as well as popular industry standard pinouts. The ESD tolerance has been improved on these devices to over ±15kV for Human Body Model. This series offers a 120kbps data rate under load, small ceramic type 0.1µF charge pump capacitors and overall ruggedness for commercial applications. Features include MaxLinear’s BiCMOS design which allows low power operation without sacrificing performance. The series is available in lead free packages and includes commercial and industrial temperature ranges.

2. Features 

    1. Operates from a single +5V power supply

    2. Meets all RS-232D and ITU V.28 specifications

    3. Operates with 0.1µF to 10µF ceramic capacitors

    4. No external capacitors required (SP233E)

    5. High data rate - 120kbps under load

    6. Low power CMOS operation

    7. Lead-free packaging

    8. Improved ESD specifications: ±15kV Human Body Model

3. Pin Information

4. The SP202ECN-L device consists of three basic circuit blocks: 1. Driver 2. Receiver 3. Charge pump

    1. driver

The driver is an inverting level transmitter that converts TTL Or CMOS logic level to EIA / TIA-232 level Reverse detection with respect to the input logic level. typical The output voltage swing of the driver is ±6V. Even in the worst case Under the load condition of 3kΩ and 2500pF, the driver output is Ensure that the minimum is ±5.0V, so as to meet RS-232 specification. Drive output is protected Prevent infinite short circuit to ground without degradation In terms of reliability. The slew rate of the driver output is internally limited to 30V/µs to meet EIA standard (EIA-232F). In addition, the driver outputs low-level to high-level conversion Meet the standard monotonic output requirements.

    2. receiver

The receiver converts the EIA / TIA-232 signal level to Invert TTL or CMOS logic output level. Due to input Usually comes from a transmission line, where the long cable length And system interference will reduce the signal, input It has a typical hysteresis margin of 500mV. This ensures The receiver is hardly affected by noise transmission String. The minimum input threshold is 0.8V and 2.8V The maximum value again fully meets the ±3V RS-232 requirements. If the input is not connected, the internal 5kΩ pull-down resistor to ground will submit the output The receiver enters a high state. In actual system applications, the signal is very likely Applied to receiver input before power up Receiver circuit. For example, when the PC The user tried to print, but found that the printer was not Open. In this case, the RS-232 signal from the PC will Appears at the receiver input of the printer. As a printer Turn on the power and the receiver will work normally. all These devices are fully protected.

    3. Charge pump

The charge pump is a patented design and used by Exar This is a unique approach compared to older inefficient designs. Charge pump requires 4 external capacitors and use Four-phase voltage conversion technology. Internal power The power supply consists of a dual charge pump, providing a The output voltage swing of the driver is ±6V. Internal oscillator Control the four stages of voltage excursion.