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SP303 Datasheet(PDF) 7 Page - Sipex Corporation |
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SP303 Datasheet(HTML) 7 Page - Sipex Corporation |
7 / 8 page 75 Corporation SIGNAL PROCESSING EXCELLENCE Figure 4. Macintosh™ AppleTalk™ Interface. the transmit data driver in ApppleTalk™ mode. Both differential drivers have output signals on each pin that typically swing ±6V. The peak to peak differential voltage swing is typically ±12V. The second driver is used for transmitting the handshake output signal and can be used as either a differential driver or single ended. This particular application required a single–ended inverting signal for the handshake output signal. Some Macintosh equipment requires an extra single–ended inverting receiver which is called a general purpose input. The GPI receiver is normally connected to pin 7 on the external 8 pin connector. This receiver is not available on the SP303CT. Since the SP303CT is usually connected to the outside world, it is suggested that the user place transient voltage suppression devices on each of the 1/0 lines to ensure up to ±25kV ESD protec- tion. TXD RTS RXD CTS DTR RFI FILTER TXDA– TXDA+ RXDA+ RXDA– HSKiA HSKoA 3 4 5 87 6 1 2 GND SUPPLY +5V +12V –12V VCCVDDVEE SP303 28 1 15 23 6 5 20 9 10 26 3 2 17 12 14 7 8 SELECT A SELECT B 13 22 No Connect RFI FILTER RFI FILTER RFI FILTER RFI FILTER RFI FILTER TXD RTS RXD CTS DTR RFI FILTER TXDA– TXDA+ RXDA+ RXDA– HSKiA HSKoA 3 4 5 87 6 1 2 GND SUPPLY +5V +12V –12V VCCVDDVEE SP303 28 1 15 23 6 5 20 9 10 26 3 2 17 12 14 7 8 SELECT A SELECT B 13 22 No Connect RFI FILTER RFI FILTER RFI FILTER RFI FILTER RFI FILTER POWER SUPPLY SEQUENCING There are two requirements for power supply sequencing for the SP303. The first is that V DD is always greater than V CC. The second is that when the part is powered up, V DD must be applied 20ms before V CC. |
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