explain
Max3222e is composed of two line drivers, two line receivers and a dual charge pump circuit. It has pin to pin (serial port connection pin, including GND) ± 15kV ESD protection.
The device meets the requirements of TIA / eia-232-f and provides an electrical interface between the asynchronous communication controller and the serial port connector. The charge pump and four small external capacitors support a single power supply from 3V to 5.5V. The device operates at a typical data signal transmission rate of up to 500kbit / s, and the output voltage swing rate of the driver is large, which is 30V/ μ s。
Input low level by setting off (pwrdown) (only 1 is consumed from the power supply) μ A current), the max3222e can be placed in off mode. When the device is turned off, the receiver remains active and the driver is placed in a high impedance state. In addition, during shutdown, the on-board charge pump will be disabled; V + decreases to VCC and V – increases to GND. By setting enable (EN) to high level, the receiver output can also be placed in high impedance state.
characteristic
• provide ESD protection for RS-232 bus pins
–± 15kV human body discharge model (HBM)
–± 8Kv IEC61000-4-2 contact discharge
–± 15kV IEC61000-4-2 air gap discharge
• meet or * meet the requirements of TIA / eia-232-f and ITU V.28 standards
• powered by 3V to 5.5V VCC power supply
• up to 500kbit / S
• two drivers and two receivers
• low standby current one μ A (typ) • external capacitor four × zero point one μ F • accept 5V logic input and 3.3V power supply
• alternative high-speed pin compatible devices for snx5c3222e (1mbit / s)
application
• industrial PC
• wired network
• data center and network equipment
• laptop
• handheld devices
