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ICL232MJE Datasheet(PDF) 5 Page - Harris Corporation |
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ICL232MJE Datasheet(HTML) 5 Page - Harris Corporation |
5 / 5 page 8-53 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. 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 - + RS-232 INPUTS AND DTR (20) DATA TERMINAL DSRS (24) DATA SIGNALING DCD (8) DATA CARRIER R1 (22) RING INDICATOR SIGNAL GROUND (7) 15 8 13 7 14 2 - 4 R2 R1 T2 T1 9 12 10 11 3 1 ICL232 C1 1 µF DTR DSRS DCD R1 +5V INPUTS OUTPUTS TTL/CMOS - + - + TD (2) TRANSMIT DATA RTS (4) REQUEST TO SEND RD (3) RECEIVE DATA CTS (5) CLEAR TO SEND 8 13 7 14 15 R2 R1 T2 T1 9 12 10 11 4 5 3 1 ICL232 C1 1 µF C2 1 µF TD RTS RD CTS INPUTS OUTPUTS TTL/CMOS - + 5 C2 1 µF 16 C3 2 6 2 6 V- V+ - C4 2 µF OUTPUTS RATE SELECT READY DETECT FIGURE 11. COMBINING TWO ICL232s FOR 4 PAIRS OF RS-232 INPUTS AND OUTPUTS µF ICL232 |
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