| v+ | I | 1 | Positive Power Supply | +5v |
| v- | I | 15 | Negative Power Supply | -5v |
| GND | l | 20 | Ground | ov |
| XIN | I | 27 | Oscillator Input | This pin corresponds to the input of the oscillator. It is normally connected to an external crystal but may also be connected to a pulse gen_erator. The nominal frequency of the oscillator is 4.9152MHz. |
| XOUT | O | 28 | Oscillator Output | This pin corresponds to theroutput of an inverter with sufficientloop qain to start and maintain the crystal oscillating. |
| CLK | O | 26 | Clock | This pin delivers a clock signal, thefrequency of which is the crystal frequency. It may be used as a buffered clock a microcontroller. |
| C/B | l | 3 | CCITT/BELL Selection | This three-state input selects the features corresponding to CCITT or BELL recommandation. |
| NS | l | 4 | Synchronous/ Asynchronous Selection | This three-state input selects the synchrorlous bit format or the asynchronous character format mode in DPSK transmission. This input allows also character length selection (refer to table 8). |
| CLS | I | 12 | Character Length | This input selects the character length in conjunction with A/S input (refer to table 8). |
| OSE | l | 6 | Over-speed Selection | This input selects the over-speed in asynchronous character format mode required by CCITT recommandation (refer to table 8). |
| BRS | l | 7 | Binary Rate Selection | A Logic "O' on this input turns chip on1200 bps_rate. A logic "1" turns the chip on 600bps or 0-300bps according to C/B selection. |
| NO TL | I I | 19 5 | Answer/Orig. Selection Test Loop Selection | A logic "O" on this input turns the chip on answer mode. A logic "1" turns the chip on originate mode. This three-state input, selects the test loops mode (refer to table 6). |
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TP2300 on stock Temperature Alarm Output (.12) An over-temperature alarm output is provided at header J2. This open collector output is designed to drive an LED. Rns J2:+ and J2:C are internally connected to the power supply (P+) and a transis- tor's collector, respectively. When the alarm is closed, Pin C is at circuit ground (P-).
o o o o o o o o c o r - ( D 5 - t ( t , 2 1 ( 0 0 ) a l n l P J a d L u a l a s P O a l q e r v \ o l l y L u n L U ! X e I A I
