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MAX3322E Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3322E Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 13 page High-input impedance is guaranteed from -13.0V to +13.0V, when the receiver is in high-input-impedance mode. The receiver is able to withstand the RS-232 maximum input voltage of ±25V. Shutdown Mode Supply current falls to less than 10µA when the MAX3322E/MAX3323E are placed in shutdown mode (logic low). When in shutdown mode, the devices’ charge pumps are turned off, V+ decays to VCC, V- is pulled to ground, the transmitter outputs and the receiver outputs are disabled (high impedance), and the receiver inputs are in high impedance (Table 1). The device enters shutdown when VL or VCC is absent. The time required to exit shutdown is typically 50µs, as shown in Figure 4. Connect SHDN to VCC if shutdown mode is not used. VL Logic Supply Input Unlike other RS-232 interface devices, in which the receiver outputs swing between 0 and VCC, the MAX3322E/MAX3323E feature a separate logic supply input (VL) that sets VOUT for the receiver outputs and sets thresholds for the transmit and shutdown inputs. This feature allows a great deal of flexibility in interfac- ing to many types of systems with different logic levels. Connect this input to the host logic supply (1.65V ≤ VL ≤ 5.5V). ±15kV ESD Protection To protect the MAX3322E/MAX3323E against ESD, transmitters and receivers have extra protection against static electricity to protect the device up to ±15kV. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. ESD protec- tion can be tested in various ways; the transmitter and receiver pins are characterized for protection to the fol- lowing limits: • ±15kV using the Human Body Model • ±8kV using the IEC 1000-4-2 Contact Discharge method • ±15kV using the IEC 1000-4-2 Air-Gap method Note: ESD performance depends on many conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. Human Body Model Figure 5 shows the Human Body Model, and Figure 6 shows the current waveform it generates when dis- charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of inter- est, which is then discharged into the test device through a 1.5k Ω resistor. ±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications _______________________________________________________________________________________ 7 TXENABLE RENABLE SHDN TRANSMITTER OUTPUT RECEIVER OUTPUT RECEIVER INPUT 1 1 0 High-Z High-Z High-Z 1 1 1 Active Enabled 5k Ω 1 0 0 High-Z High-Z High-Z 1 0 1 Active Enabled High-Z 0 1 0 High-Z High-Z High-Z 0 1 1 High-Z Enabled 5k Ω 0 0 0 High-Z High-Z High-Z 0 0 1 High-Z Enabled High-Z Table 1. Tx/Rx Logic 50 µs/div T2 T1 5V/div 2V/div VCC = 3.3V C1–C4 = 0.1 µF Figure 4. Transmitter Outputs when Exiting Shutdown |
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