MAX3233E/MAX3235E are EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wake-up features, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection.
The Maxim MAX3233E and MAX3235E are dual RS‑232 transceivers that integrate internal charge‑pump capacitors, providing +15 kV ESD protection and AutoShutdown Plus low‑power operation.
They are intended for subnotebook, handheld, cellular phone and other battery‑powered equipment, and are offered in 20‑pin SO and plastic DIP packages.
| Supply Voltage Range | +3.3 V (MAX3233E) / +5 V (MAX3235E) |
|---|---|
| Maximum Data Rate | 250 kbps |
| ESD Protection | +15 kV HBM, +8 kV IEC contact, +15 kV IEC air‑gap |
| Supply Current (normal operation) | 1 A |
The devices achieve a 1 A supply current in normal operation.
AutoShutdown Plus shuts down the charge pumps when no RS‑232 activity is detected for 30 seconds, lowering the supply current to 1 pA.
Pins are protected to +15 kV Human Body Model, +8 kV IEC contact discharge, and +15 kV IEC air‑gap discharge.
The MAX3233E works from a +3.3 V supply, while the MAX3235E works from a +5 V supply.