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MAX562EAI Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX562EAI Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page Complete 230kbps, 2.7V to 5.25V Serial Interface for Notebook Computers 6 _______________________________________________________________________________________ _______________Detailed Description The MAX562 has three sections: the charge-pump voltage converter, the drivers (transmitters), and the receivers. Charge-Pump Voltage Converter The charge-pump voltage converter is used to produce a positive and a negative supply to drive the transmitters. The positive voltage (V+) is generated by a regulated charge pump working as either a doubler or a tripler (depending on the VCC level) and using capacitors C1A, C1B and C3 (see Typical Operating Circuit). The negative voltage (V-) derives from V+ using a simple charge-pump inverter that employs capacitors C2 and C4. These charge-pump converters are regulated to give output voltages of +5.8V and -5.2V. Having regulated supplies generated on-chip makes the MAX562's performance insen- sitive to variations in VCC from 2.7V to 5.25V, transmitter load- ing changes, and operating temperature changes. When SHDN is low, the charge pumps are disabled, V+ is internally connected to VCC, and V- is internally connected to GND. EIA/TIA-562 Drivers The driver output voltage is guaranteed to meet the ±3.7V EIA/TIA-562 specification over the full range of operating temperatures and voltages, when each transmitter is loaded with up to 3k Ω and operated up to 230kbps (see Typical Operating Characteristics). The typical driver out- put voltage swing exceeds ±4V with a 3k Ω load on all transmitter outputs. The open-circuit output voltage swing is typically from (V+ - 0.7V) to (V- + 0.7V). Output swing is not significantly dependent on VCC since the charge pumps are regulated. Input thresholds are CMOS and TTL compatible. Connect unused inputs to VCC or to GND. When SHDN is low, the driver outputs are off and their leak- age currents are less than 10µA, even if the transmitter outputs are back-driven between -7V and +15V. Taking SHDN low does not disable the receivers. When SHDN and EN are both low, the entire chip is disabled and all outputs are high impedance. Power consumption is lowest in this condition. Exiting shutdown takes about 100µs, but depends on VCC. Figure 5 shows SHDN VOH VOL +3V 0V OUTPUT DISABLE TIME (tDT) +3V -3V 0V A. TIMING DIAGRAM 1 OR 0 TX 3k 50pF B. TEST CIRCUIT TRANSMITTER OUTPUTS Figure 3. Transmitter-Output Disable Timing EN VOH -1V, VOL +1.6V R_IN R_OUT 1k 150pF A. TEST CIRCUIT B. ENABLE TIMING EN INPUT RECEIVER OUTPUTS +3V 0V OUTPUT ENABLE TIME (tER) VOH VOL EN RECEIVER OUTPUTS EN +3V 0V OUTPUT DISABLE TIME (tDR) VOH -0.5V VOL +0.5V EN INPUT VOH VOL C. DISABLE TIMING R_ Figure 4. Receiver-Output Enable and Disable Timing |
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