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ICL232LPE Datasheet(PDF) 5 Page - Intersil Corporation |
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ICL232LPE Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 6 page 5 300 Ω with ±2V applied to the outputs and VCC =0V. Receivers The receiver inputs accept up to ±30V while presenting the required 3k Ω to 7kΩ input impedance even it the power is off (VCC = 0V). The receivers have a typical input threshold of 1.3V which is within the ±3V limits, known as the transition region, of the RS-232 specification. The receiver output is 0V to VCC. The output will be low whenever the input is greater than 2.4V and high whenever the input is floating or driven between +0.8V and -30V. The receivers feature 0.5V hysteresis to improve noise rejection. Applications The ICL232 may be used for all RS-232 data terminal and communication links. It is particularly useful in applications where ±12V power supplies are not available for conven- tional RS-232 interface circuits. The applications presented represent typical interface configurations. A simple duplex RS-232 port with CTS/RTS handshaking is illustrated in Figure 10. Fixed output signals such as DTR (data terminal ready) and DSRS (data signaling rate select) is generated by driving them through a 5k Ω resistor connected to V+. In applications requiring four RS-232 inputs and outputs (Figure 11), note that each circuit requires two charge pump capacitors (C1 and C2) but can share common reservoir capacitors (C3 and C4). The benefit of sharing common res- ervoir capacitors is the elimination of two capacitors and the reduction of the charge pump source impedance which effectively increases the output swing of the transmitters. TOUT V- < VTOUT <V+ 300 Ω 400k Ω TXIN GND < TXIN <VCC V- V+ VCC FIGURE 7. TRANSMITTER ROUT GND < VROUT <VCC 5k Ω RXIN -30V < RXIN < +30V GND VCC FIGURE 8. RECEIVER T1IN,T2IN VOH VOL tPLH tPHL Average Propagation Delay = tPHL + tPLH 2 OR R1IN,R2IN T1OUT,T2OUT OR R1OUT,R2OUT FIGURE 9. PROPAGATION DELAY DEFINITION - + - + - + CTR (20) DATA TERMINAL READY DSRS (24) DATA SIGNALING RATE RS-232 INPUTS AND OUTPUTS TD (2) TRANSMIT DATA RTS (4) REQUEST TO SEND RD (3) RECEIVE DATA CTS (5) CLEAR TO SEND SIGNAL GROUND (7) 15 8 13 7 14 16 - + 6 R2 R1 T2 T1 9 12 10 11 4 5 3 1 ICL232 C1 1 µF C2 1 µF TD RTS RD CTS SELECT +5V INPUTS OUTPUTS TTL/CMOS C3 1 µF C4 1 µF 2 5k Ω 5k Ω FIGURE 10. SIMPLE DUPLEX RS-232 PORT WITH CTS/RTS HANDSHAKING ICL232 |
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