| TYPE | DESCRIPTION |
|---|
| Mounting Style | Surface Mount |
| Number of Pins | 8 Pin |
| Supply Voltage (DC) | 2.50V (min) |
| Case/Package | SOIC-8 |
| Output Current | 200 mA |
| Supply Current | 450 µA |
| Number of Positions | 8 Position |
| Power Dissipation | 727 mW |
| Operating Temperature (Max) | 85 ℃ |
| Operating Temperature (Min) | -40 ℃ |
| Supply Voltage | 3.3V, 5V |
| Supply Voltage (Max) | 6 V |
| Supply Voltage (Min) | 2.5 V |
| TYPE | DESCRIPTION |
|---|
| Product Lifecycle Status | Unknown |
| Packaging | Cut Tape (CT) |
| Operating Temperature | -40℃ ~ 85℃ |
The MAX253ESA+T is a transformer driver for isolated RS485 interface in 8 pin NSOIC package. It is a monolithic oscillator/power-driver specifically designed to provide isolated power for an isolated RS485 or RS232 data interface. The device drives a centre-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W. It consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break before make action between the two switches. The SD pin puts the entire device into a low-power shutdown state, disabling both the power switches and oscillator. It is used in high noise-immunity communications interface, isolated and/or high-voltage power supplies and bridge ground differentials.
● Supply voltage range is 2.5V to 6V
● Operating temperature range from -40°C to 85°C
● Shutdown supply current is 0.4µA
● Pin-selectable frequency of 350KHz or 200KHz
● Maximum on-resistance of switch is 4ohm
● Maximum operating supply current is 5mA
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