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SP233AET Datasheet(PDF) 5 Page - Sipex Corporation |
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SP233AET Datasheet(HTML) 5 Page - Sipex Corporation |
5 / 12 page Date: 10/17/ 05 SP232A Series Enhanced RS232 Transceivers © Copyright 2005 Sipex Corporation 5 The instantaneous slew rate of the transmitter output is internally limited to a maximum of 30V/ µs in order to meet the standards [EIA RS-232-F ]. The transition region slew rate of these enhanced products is typically 10V/ µs. The smooth transi- tion of the loaded output from V OL to VOH clearly meets the monotonicity requirements of the stan- dard [EIA RS-232-F]. Receivers The receivers convert RS-232 input signals to inverted TTL signals. Since the input is usually from a transmission line, where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mV. This ensures that the receiver is virtually immune to noisy transmission lines. The input thresholds are 0.8V minimum and 2.4V maximum, again well within the ±3V RS-232 requirements. The receiver inputs are also pro- tected against voltages up to ±25V. Should an input be left unconnected, a 5K Ω pulldown resis- tor to ground will commit the output of the receiver to a high state. Figure 2. Typical Circuits using the SP233ACP and SP233ACT Figure 3. Typical Circuits using the SP310A and SP312A R2 20 19 R IN R OUT 2 R 1 34 R IN R OUT 1 T2 1 18 T IN 2 T OUT 2 T1 2 5 T IN 1 T OUT 1 9 GND 400k Ω 400k Ω 13 8 C + C - V+ V- V- 1 1 10 7 VCC +5V INPUT 11 2 1 5k Ω 5k Ω 17 12 C + C + C - C - 2 2 GND 6 14 15 16 2 2 Do not make connection to these pins SP233ACP Connect on PCB Pin 11 to Pin 15 Pin 10 to Pin 16 Pin 12 to Pin 17 Both Pins 6 and 9 to GND R2 20 19 R IN R OUT 2 R 1 34 R IN R OUT 1 T2 1 18 T IN 2 T OUT 2 T1 2 5 T IN 1 T OUT 1 9 GND 400k Ω 400k Ω 14 13 C + C - V+ V- V- 1 1 11 7 VCC +5V INPUT 12 2 1 5k Ω 5k Ω 17 10 C + C + C - C - 2 2 GND 6 8 15 16 2 2 Do not make connection to these pins SP233ACT Connect on PCB Pin 12 to Pin 15 Pin 11 to Pin 16 Pin 10 to Pin 17 Both Pins 6 and 9 to GND R2 10 9 R IN R OUT 2 R1 13 14 R IN R OUT 1 T2 11 8 T IN 2 T OUT 2 T1 12 15 T IN 1 T OUT 1 16 GND 400k Ω 400k Ω 4 2 C + C - 1 1 7 17 V CC V+ + + 0.1 F 6.3V µ Charge Pump +5V INPUT 3 V- 2 1 5k Ω 5k Ω 6 5 C + C - 2 2 + 0.1 F 16V µ 10 F 6.3V µ SP310A + 18 ON/OFF + 0.1 µF 10V * *The negative terminal of the V+ storage capacitor can be tied to either VCC or GND. Connecting the capacitor to VCC (+5V) is recommended. 0.1 µF 10V R2 10 9 R IN R OUT 2 R1 13 14 R IN R OUT 1 T2 11 8 T IN 2 T OUT 2 T1 12 15 T IN 1 T OUT 1 16 GND 400k Ω 400k Ω 4 2 C + C - 1 1 7 17 V CC V+ + + 0.1 F 6.3V µ +5V INPUT 3 V- 2 1 5k Ω 0.1 F 10V µ 5k Ω 6 5 C + C - 2 2 + 0.1 F 16V µ Charge Pump 10 F 6.3V µ SP312A + 18 SHUTDOWN 1 EN + 0.1 F 10V µ * *The negative terminal of the V+ storage capacitor can be tied to either VCC or GND. Connecting the capacitor to VCC (+5V) is recommended. |
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