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SP333CT Datasheet(PDF) 6 Page - Sipex Corporation |
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SP333CT Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 13 page 6 TGoddard/SP333/9617R0 SP333 RS-232/AppleTalk Programmable Transceiver © Copyright 2000 Sipex Corporation THEORY OF OPERATION... The SP333 is a single chip device that can be configured via software for either RS-232 or AppleTalk™ interface modes at any time. The SP333 is made up of three basic circuit ele- ments: single-ended drivers and receivers, dif- ferential drivers and receivers, and charge pump. APPLETALK™ DRIVERS/RECEIVERS... To program the SP333 for MacMode, Pin 25 should be connected to a logic HIGH. In MacMode, the SP333 offers a complete AppleTalk serial interface. The driver section of the AppleTalk interface is made up of a differential driver and a single- ended inverting driver. The differential driver has voltage swings that are typically ±5V on each output pin under loaded conditions, and typically ±8V under no-load conditions. The differential driver can maintain ±3.6V (mini- mum) swings (per pin) under worst case load conditions of 450 Ω between the differential output. The differential driver is equipped with a tri- state control pin. When TXEN is a logic LOW, the differential driver is active. When the TXEN pin is a logic HIGH, the differential driver outputs are tri-stated. The TXEN pin only functions in MacMode. The differential AppleTalk driver can support data rates up to 10Mbps. The single-ended AppleTalk driver also has typical voltage output swings of ±5V under loaded conditions, and ±8V under no-load con- ditions. The single-ended AppleTalk driver can maintain ±3.6V (minimum) swings under worst case conditions of 450 Ω to ground. The single- ended AppleTalk driver can support data rates over 400kbps. The receiver section of the SP333 is made up of a differential receiver, a single-ended non-in- verting receiver , and a single-ended inverting receiver. The differential receiver has an input sensitivity of ±200mV over a common mode range of ±7V. The receivers have a typical input resistance of 15k Ω (12kΩ minimum). The differential receiver can receive data up to 10Mbps. The single-ended non-inverting receiver has a ±200mV input threshold, however, the input voltage can vary between ±7V. The typical input resistance of the single-ended non-invert- ing receiver is 15k Ω (12kΩ minimum). The single-ended non-inverting receiver can also receive data up to 10Mbps. The SP333 also has a single-ended inverting receiver input. This receiver is basically an RS- 232 receiver (R5 receiver) and is typically used as a GPI (General Purpose Input) in the AppleTalk interface. The GPI input has TTL- compatible input thresholds that can receive +3V 0V RXEN 5V RXx 0V 1.5V 1.5V tZL tZH f = 1MHz; tR < 10ns; tF < 10ns 1.5V 1.5V tLZ tHZ 0.5V 0.5V Output normally LOW Output normally HIGH VIL VIH RXx Figure 6. Receiver Enable and Disable Times |
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