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MAX3212EWI Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX3212EWI Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page not the absolute voltages. Increasing the size of C1 and C2 increases the time V+ and V- take to reach their final value. Bypass VCC to GND with at least 0.33 µF close to the MAX3212. Increase this to 4.7 µF if there are no other VCC supply bypass components less than 6 inches (15cm) away from the MAX3212. Component suppliers are listed in Table 1. RS-232 Drivers All three drivers are identical and deliver EIA/TIA-232E and EIA/TIA-562 output voltage levels when VCC is be- tween 2.7V and 3.6V. When FORCEOFF is driven low or when the AutoShutdown circuitry senses invalid voltage levels at all receiver inputs, the drivers are disabled and the outputs are forced into a high-impedance state. RS-232 Receivers The MAX3212 receivers convert RS-232 signals to CMOS-logic output levels. All receivers have one in- verting three-state output. Receiver 5 also has a com- plementary (noninverting) output. In shutdown, all five inverting receivers can be either active or inactive under logic control. The complementary output (R5OUTB) is always active, regardless of the state of EN or the part’s shutdown sta- tus. R5OUTB can monitor RS-232 activity while the other receivers are high impedance. This allows Ring Indicator to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where the UART’s VCC is set to 0V in shut- down. (See Figure 2.) Enable Control The EN input has two functions: It allows enabling/dis- abling of the receivers, and it is used to reset the transi- tion detector. Driving EN low places five inverting receiver outputs (R_OUT) into a high-impedance state. R5OUTB is always active, regardless of the state of EN or the part’s shutdown status (Table 2). EN has no effect on T_OUT. EN also resets the transition detector. Drive EN high and then low to reset the TRAN output low. TRAN goes high when a transition occurs on any receiver input. +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver 6 _______________________________________________________________________________________ Table 1. Suggested Component Suppliers Table 2. AutoShutdown Logic MANUFACTURER PART NUMBER PHONE FAX Motorola MMBD6050LT1 USA (408) 749-0510 USA (408) 991-7420 Murata-Erie LQH4N150K-TA USA (404) 436-1300 Japan (075) 951-9111 USA (404) 684-1541 Japan (075) 955-6526 Sumida CD43150 USA (708) 956-0666 Japan (03) 3607-5111 USA (708) 956-0702 Japan (03) 3607-5428 TDK NLC453232T-150K USA (708) 803-6100 Japan (03) 3278-5111 USA (708) 803-6296 Japan (03) 3278-5358 Allegro TMPD6050LT USA (508) 853-5000 USA (508) 853-5049 Philips PMBD6050 USA (401) 762-3800 USA (401) 767-4493 RS-232 SIGNAL PRESENT AT RECEIVER INPUT FORCEOFF INPUT FORCEON INPUT INVALID OUTPUT TRANSCEIVER STATUS Yes H X H Normal Operation No H H L Normal Operation (Forced On) No H L L Shutdown (AutoShutdown) Yes L X H Shutdown (Forced Off) No L X L Shutdown (Forced Off) Diodes Inductors |
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