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The AY0438 is a CMOS integrated device that drives aliquid crystal display, usually under microprocessorcontrol. The part acts as a smart peripheral that drivesup to 32 LCD segments. It needs only three controllines due to its serial input construcTIon. It latches thedata to be displayed and relieves the microprocessorfrom the task of generaTIng the required waveforms.The AY0438 can drive any standard or custom paralleldrive LCD display, whether it be field effect or dynamicscattering; 7-, 9-, 14- or 16-segment characters; decimals;leading + or -; or special symbols. SeveralAY0438 devices can be cascaded. The AC frequencyof the LCD waveforms can either be supplied by theuser or generated by attaching a capacitor to the LCDinput, which controls the frequency of an internal oscillator.The AY0438 is available in 40-lead dual in-line plasTIcand 44-lead PLCC packages. Unpackaged dice arealso available.
