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MAX3222EEWN Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3222EEWN Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 26 page ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers 10 ______________________________________________________________________________________ The complementary outputs on the MAX3237E/ MAX3241E (R_OUTB) are always active, regardless of the state of EN or SHDN. This allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where VCC drops to zero in shutdown to accommodate peripherals such as UARTs (Figure 2). MAX3222E/MAX3237E/MAX3241E/ MAX3246E Shutdown Mode Supply current falls to less than 1µA in shutdown mode (SHDN = low). The MAX3237E’s supply current falls to10nA (typ) when all receiver inputs are in the invalid range (-0.3V < R_IN < +0.3). When shut down, the device’s charge pumps are shut off, V+ is pulled down to VCC, V- is pulled to ground, and the transmitter out- puts are disabled (high impedance). The time required to recover from shutdown is typically 100µs, as shown in Figure 3. Connect SHDN to VCC if shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB (MAX3237E/MAX3241E). ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated to protect against electrostatic dis- charges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup. Furthermore, the MAX3237E logic I/O pins also have ±15kV ESD protection. Protecting the logic I/O pins to ±15kV makes the MAX3237E ideal for data cable applications. T1OUT R1OUTB Tx 5k Ω UART VCC T1IN LOGIC TRANSITION DETECTOR R1IN R1OUT THREE-STATED EN = VCC SHDN = GND VCC TO µP Rx PREVIOUS RS-232 Tx UART PROTECTION DIODE PROTECTION DIODE SHDN = GND VCC VCC GND Rx 5k Ω a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM A ACTIVE RECEIVER OUTPUT IN SHUTDOWN. b) NEW MAX3237E/MAX3241E: EN SHUTS DOWN RECEIVER OUTPUTS B (EXCEPT FOR B OUTPUTS), SO NO CURRENT FLOWS TO UART IN SHUTDOWN. B B OUTPUTS INDICATE RECEIVER ACTIVITY DURING SHUTDOWN WITH EN HIGH. GND MAX3237E/MAX3241E Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237E/MAX3241E (b) with Previous Transceivers (a) 40 µs/div SHDN T2OUT T1OUT 5V/div 0 2V/div 0 VCC = 3.3V C1–C4 = 0.1 µF Figure 3. Transmitter Outputs Recovering from Shutdown or Powering Up |
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