The MAX7231/32/33/34 family are low‑power LCD driver ICs that interface microprocessors to multiplexed numeric and alphanumeric displays. MAX7231 drives 8 digits with parallel input, MAX7232 drives 10 digits with serial input, MAX7233 drives 4 alphanumeric characters, and MAX7234 drives 5 alphanumeric characters. All devices include two independent annunciators per digit and an on‑chip oscillator.
Typical applications include portable instrumentation, industrial equipment, telecommunications, medical equipment, panel meters, and machine control. The datasheet details absolute maximum ratings, electrical characteristics, pin configurations, terminal definitions, timing diagrams, and package information for the 40‑lead DIP and 44‑lead plastic chip carrier versions.
| Digits driven (MAX7231) | 8 digits |
|---|---|
| Digits driven (MAX7232) | 10 digits |
| Alphanumeric characters (MAX7233) | 4 characters |
| Alphanumeric characters (MAX7234) | 5 characters |
| Annunciators per digit | 2 independent annunciators |
| Supply voltage (Vt) | 4.5 V – 5.5 V |
| Operating temperature range | -20 °C to +85 °C |
Each device provides two independent annunciators per digit.
The recommended supply voltage is between 4.5 V and 5.5 V.