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MAX253CSA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX253CSA Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 18 page Transformer Driver for Isolated RS-485 Interface _______________Detailed Description The MAX253 is an isolated power-supply transformer driver specifically designed to form the heart of a fully isolated RS-485 data interface. Completely isolated communications are obtained by combining the MAX253 with a linear regulator, a center-tapped trans- former, optocouplers, and the appropriate Maxim inter- face product (as described in the Isolated RS-485/RS- 232 Data Interface section). The MAX253 consists of an RC oscillator followed by a toggle flip-flop, which generates two 50% duty-cycle square waves, out-of-phase at half the oscillator fre- quency (Figure 2). These two signals drive the ground- referenced output switches. Internal delays ensure break-before-make action between the two switches. Ground SD for normal operation. When high, SD dis- ables all internal circuitry, including the oscillator and both power switches. Pulling FS low reduces the oscillator frequency and low- ers the supply current (see Supply Current vs. Temperature in the Typical Operating Characteristics). FS includes a weak pull-up, so it will be set to the high- frequency state if not connected. MAX253 D1 D2 FS GND1 GND2 VCC 1 8 4 6 27 3 SD FREQUENCY SWITCH ON / OFF R2 50 Ω R1 50 Ω VIN 5V C1 0.1µF Figure 1. Test Circuit MAX253 D1 D2 FS GND2 GND1 VCC FREQUENCY SWITCH C3 C1 C2 5V @ 200mA ISO OUTPUT 5V N N Q Q OSC F / F VIN SD ON / OFF 400kHz/ 700kHz T ISO GND Figure 2. Block Diagram MAX253 6 Maxim Integrated |
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