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MAX562 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX562 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page +3V-Powered, Low-Power, True RS-232 Transceiver 4 _______________________________________________________________________________________ ____________________________Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25°C, unless otherwise noted.) 500 1500 2500 3500 LOAD CAPACITANCE (pF) 6 7 9 10 12 11 SLEW RATE vs. LOAD CAPACITANCE 4500 8 RISING EDGE ALL TRANSMITTERS LOADED SIMULTANEOUSLY w/ SPECIFIED CAPACITANCE AND 3k Ω 13 14 FALLING EDGE NAME FUNCTION LN LP VCC Supply Voltage Input, 3.0V to 3.6V 1 2 – S — D EN R1OUT- R5OUT Receiver Outputs, swing GND to VCC T1IN-T3IN Transmitter Inputs 3 4 5 Transmitter Outputs R5IN-R1IN Receiver Inputs 6-10 11-13 15-17 18-22 _____________________Pin Description PIN T3OUT- T1OUT V+ Positive Supply generated on-board 23 GND Ground 24 V- 14 Inductor/Diode Connection Point Inductor/Diode Connection Point Shutdown Control. Connect to VCC for normal operation. Connect to GND to shut down the power supply and to disable the drivers. Receiver status is not changed by this control. Receiver Enable Control. Connect to VCC for normal operation. Connect to GND to force the receiver outputs into a high-Z state. Negative Supply generated on-board _______________Detailed Description The MAX212 line driver/receiver is intended for 3V- powered EIA/TIA-232E and V.28/V.24 communications interfaces where 3 drivers and 5 receivers are required. The operating voltage range extends from 3.6V down to 3.0V while still maintaining true RS-232 and EIA/TIA-562 transmitter output voltage levels. The circuit comprises three sections: power supply, transmitters, and receivers. The power-supply sec- tion converts the supplied 3V to about ±6.5V, to pro- vide the voltages necessary for the drivers to meet true RS-232 levels. External components are small and inexpensive. The transmitters and receivers are guaranteed to oper- ate at data rates of 120kbps. A shutdown mode reduces current to 1µA to extend battery life in portable systems. While shut down, all receivers can remain active or can be disabled under logic control. This enables a system incorporating the MAX212 to be in low-power shutdown mode and still monitor incoming RS-232 activity. Three-state drivers on all receiver outputs are provided so that multiple receivers, generally of different inter- face standards, can be wire-ORed at the UART. 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) 80 100 120 140 180 160 SUPPLY POWER vs. SUPPLY VOLTAGE 4.5 120kbps ALL TRANSMITTERS AT SPECIFIED DATA RATES w/ 2500pF AND 3k Ω LOADS 64kbps 20kbps 0 1000 2000 3000 LOAD CAPACITANCE (pF) 20 30 40 50 70 60 SUPPLY CURRENT vs. LOAD CAPACITANCE 5000 120kbps 64kbps 20kbps 4000 80 ALL TRANSMITTERS AT SPECIFIED CAPACITANCE AND DATA RATES w/ 3k Ω LOADS |
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