Datasheet MAX253 (Maxim)
| Manufacturer | Maxim |
| Description | Transformer Driver for Isolated RS-485 Interface |
| Pages / Page | 18 / 1 — MAX253. Transformer Driver for. Isolated RS-485 Interface. General … |
| File Format / Size | PDF / 284 Kb |
| Document Language | English |
MAX253. Transformer Driver for. Isolated RS-485 Interface. General Description. Benefits and Features. Ordering Information
Model Line for this Datasheet
- MAX253C/D MAX253CPA MAX253CPA+ MAX253CSA MAX253CSA+ MAX253CSA+T MAX253CSA+TG002 MAX253CSA-T MAX253CUA MAX253CUA+ MAX253CUA+T MAX253CUA-T MAX253EPA MAX253EPA+ MAX253ESA MAX253ESA+ MAX253ESA+T MAX253ESA+TG002 MAX253ESA-T MAX253ESA/V+ MAX253ESA/V+T MAX253EUA MAX253EUA+ MAX253EUA+T MAX253MJA MAX253MSA/PR MAX253MSA/PR+ MAX253MSA/PR+T
Text Version of Document
MAX253 Transformer Driver for Isolated RS-485 Interface General Description Benefits and Features
The MAX253 monolithic oscillator/power-driver is • Simple Power-Supply Transformer Driver Design for specifically designed to provide isolated power for an Isolated RS-485/RS-232 Data-Interface Applications isolated RS-485 or RS-232 data interface. The device • Single 5V or 3.3V Supply drives a center-tapped transformer primary from a 5V • Low-Current Shutdown Mode: 0.4µA or 3.3V DC power supply. The secondary can be • Pin-Selectable Frequency: 350kHz or 200kHz wound to provide any isolated voltage needed at power levels up to 1W. • 8-Pin DIP, SO, and µMAX® Packages Take Minimal Board Space The MAX253 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-
Ordering Information
flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-
PART TEMP RANGE PIN-PACKAGE
make action between the two switches. MAX253CPA 0°C to +70°C 8 Plastic DIP The SD pin puts the entire device into a low-power MAX253CSA 0°C to +70°C 8 SO shutdown state, disabling both the power switches and MAX253CUA 0°C to +70°C 8 µMAX oscillator. MAX253C/D 0°C to +70°C Dice*
Applications
MAX253EPA -40°C to +85°C 8 Plastic DIP MAX253ESA -40°C to +85°C 8 SO Isolated RS-485/RS-232 Power-Supply Transformer Driver MAX253ESA/V -40°C to +85°C 8 SO MAX253MJA -55°C to +125°C 8 CERDIP** High Noise-Immunity Communications Interface *Contact factory for dice specifications. Isolated and/or High-Voltage Power Supplies **Contact factory for availability and processing to MIL-STD-883. Bridge Ground Differentials Devices are also available in a lead(Pb)-free/RoHS-compliant package. Specify lead-free by adding a (+) to the part number Medical Equipment when ordering. Process Control /V Denotes an automotive qualified part.
Typical Operating Circuit
VIN 5V ON / OFF C1 4 6 OUTPUT SD VCC 1 5V @ 200mA D1 C3 C2 MAX253 3 8 FS D2 FREQUENCY SWITCH GND1 GND2 2 7 µMAX is a registered trademark of Maxim Integrated Products, Inc. 19-0226; Rev 3; 2/15
The MAX253 monolithic oscillator/power-driver is • Simple Power-Supply Transformer Driver Design for specifically designed to provide isolated power for an Isolated RS-485/RS-232 Data-Interface Applications isolated RS-485 or RS-232 data interface. The device • Single 5V or 3.3V Supply drives a center-tapped transformer primary from a 5V • Low-Current Shutdown Mode: 0.4µA or 3.3V DC power supply. The secondary can be • Pin-Selectable Frequency: 350kHz or 200kHz wound to provide any isolated voltage needed at power levels up to 1W. • 8-Pin DIP, SO, and µMAX® Packages Take Minimal Board Space The MAX253 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-
Ordering Information
flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-
PART TEMP RANGE PIN-PACKAGE
make action between the two switches. MAX253CPA 0°C to +70°C 8 Plastic DIP The SD pin puts the entire device into a low-power MAX253CSA 0°C to +70°C 8 SO shutdown state, disabling both the power switches and MAX253CUA 0°C to +70°C 8 µMAX oscillator. MAX253C/D 0°C to +70°C Dice*
Applications
MAX253EPA -40°C to +85°C 8 Plastic DIP MAX253ESA -40°C to +85°C 8 SO Isolated RS-485/RS-232 Power-Supply Transformer Driver MAX253ESA/V -40°C to +85°C 8 SO MAX253MJA -55°C to +125°C 8 CERDIP** High Noise-Immunity Communications Interface *Contact factory for dice specifications. Isolated and/or High-Voltage Power Supplies **Contact factory for availability and processing to MIL-STD-883. Bridge Ground Differentials Devices are also available in a lead(Pb)-free/RoHS-compliant package. Specify lead-free by adding a (+) to the part number Medical Equipment when ordering. Process Control /V Denotes an automotive qualified part.
Typical Operating Circuit
VIN 5V ON / OFF C1 4 6 OUTPUT SD VCC 1 5V @ 200mA D1 C3 C2 MAX253 3 8 FS D2 FREQUENCY SWITCH GND1 GND2 2 7 µMAX is a registered trademark of Maxim Integrated Products, Inc. 19-0226; Rev 3; 2/15
