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LTC1323 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1323 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1323 SWITCHI G WAVEFOR S Figure 12. Single-Ended Receiver 1.5V RXI, RXI RXI RXI 1.5V VOL VOH VIL VIH V VIH LTC1323 • F12 tPHL 0.8V 1.5V tPLH 2.4V 1.5V f = 1MHz: tr ≤ 10ns: tf ≤ 10ns Figure 13. Receiver Enable and Disable 1.5V 3V 0V RXEN f = 1MHz: tr ≤ 10ns: tf ≤ 10ns 1.5V RXO, RXO, RXDO VOL 5V tZL tLZ 0.5V OUTPUT NORMALLY LOW 0V LTC1323 • F13 2.3V 2.3V tZH VOH OUTPUT NORMALLY HIGH tHZ 0.5V RXO, RXO, RXDO APPLICATIO S I FOR ATIO Functional Description The “serial port” on the back of an Apple-compatible computer or peripheral is a fairly versatile “multi-protocol” connector. It must be able to connect to a wide bandwidth LAN (an AppleTalk/LocalTalk network), which requires a high speed differential transceiver to meet the AppleTalk specification, and it must also be able to connect directly to a printer or modem through a short RS232 style link. The LTC1323 is designed to provide all the functions necessary to implement such a port on a single chip. Two versions of the LTC1323 are available: a 16-pin SO version which provides the minimum solution for interfacing to an AppleTalk network in a smaller package, and a larger 24-pin SO Wide version which additionally includes all the hand- shaking lines required to implement a complete AppleTalk/ modem/printer serial port. All LTC1323s run from a single 5V power supply while providing true single-ended com- patibility, and include a 0.5 µA low power shutdown mode to improve lifetime in battery-powered devices. The 24- pin SO Wide version also includes a receiver keep-alive mode for monitoring external signals while drawing 65 µA typically. The LTC1323 includes an RS422-compatible differential driver/receiver pair for data transmission, with the driver specified to drive 2V into the 100 Ω primary of a typical LocalTalk interface transformer/RFI interference network. Either output of the differential RS422 driver can also act as an single-ended driver, allowing the LTC1323 to commu- nicate over a standard serial connection. The 24-pin SO Wide LTC1323 also includes an extra single ended only driver and two extra RS232-compatible single-ended re- ceivers for handshaking lines. All versions include an on- board charge pump to provide a regulated – 5V supply required for the single-ended drivers. The charge pump can also provide up to 10mA of external load current to power other circuitry. |
Similar Part No. - LTC1323_15 |
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Similar Description - LTC1323_15 |
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