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MAX3190EEUT-T Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX3190EEUT-T Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page Detailed Description The MAX3190/MAX3190E are EIA/TIA-232 transmitters that convert CMOS/TTL logic levels to RS-232 signals. They operate on ±7.5V to ±12V supplies and feature enhanced electrostatic discharge protection (see ESD Protection). The MAX3190/MAX3190E guarantee a 460kbps data rate with worst-case loads of 3k Ω in par- allel with 1000pF. The MAX3190/MAX3190E invert the TOUT signal relative to TIN (standard RS-232). The transmitter input does not have a pullup resistor and should be connected to GND if unused. Shutdown The MAX3190/MAX3190E feature a shutdown input. Drive SHDN low to reduce the supply current to 1µA (max). Shutdown also forces TOUT into a high-imped- ance state, allowing the signal line to be safely con- trolled by other transmitters. Drive SHDN high for normal operation. ESD Protection As with all Maxim devices, ESD protection structures are incorporated on all pins to protect against ESD encoun- tered during handling and assembly. The MAX3190E’s transmitter output has extra protection against static electricity. Maxim has developed state-of-the-art struc- tures enabling this pin to withstand ESD up to ±15kV without damage or latch-up. The MAX3190E’s transmit- ter output is characterized for protection to the following limits: • ±15kV using the Human Body Model • ±8kV using the Contact Discharge method specified in IEC 1000-4-2 • ±15kV using the Air-Gap Discharge method specified in IEC 1000-4-2 Human Body Model Figure 2 shows the Human Body Model, and Figure 3 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 interest, and then discharged into the test device through a 1.5k Ω resistor. IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi- cally refer to ICs. The MAX3190E enables the design of equipment that meets the highest level (Level 4) of IEC 1000-4-2 without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2. Because series resistance is lower in the IEC 1000-4-2 model, the ESD withstand voltage measured to this standard is general- ly lower than that measured using the Human Body. Figure 4 shows the IEC 1000-4-2 model, and Figure 5 ±15kV ESD-Protected, 460kbps, RS-232 Transmitters in SOT23-6 4 _______________________________________________________________________________________ Pin Description 50% 50% 50% 50% tPLH tPHL +10V -10V TOUT TIN VIH VIL Figure 1. Transmitter Propagation-Delay Timing NAME FUNCTION 1 SHDN Active-Low Shutdown. Pull low to reduce the supply current and to force TOUT into a high-impedance state. 2 GND Ground PIN 3 TIN TTL/CMOS Transmitter Input 4 TOUT RS-232 Transmitter Output 6 VCC Positive Supply Voltage 5 VEE Negative Supply Voltage CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 100pF RC 1M Ω RD 1500 Ω HIGH- VOLTAGE DC SOURCE DEVICE UNDER TEST Figure 2. Human Body ESD Test Model |
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