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MAX202IDWR RS-232 Interface Transceiver

Other Parts Discussed in Thread: MAX202, MAX3232, MAX232, TRS232E, TRS232, MAX232E

Hello,

I am experiencing problems with the charge pumps on these chips. Charge pumps operate properly up to about 5.65V at the Vcc (pin 16). At this voltage, very high ripples starts to show up at +V and -V charge pump outputs (pins 2 and 6). At -40°C, charge pumps operate properly just to about 5.5V at the Vcc.

In my circuit, charge pump capacitors are 0.1µF/50V 5% X7R ceramics. V+ capacitor is connected to Vcc.

Vcc decoupling capacitor is 47µF, ceramic type.

Please advice.