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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM7968 데이터시트(PDF) 13 Page - Advanced Micro Devices |
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AM7968 데이터시트(HTML) 13 Page - Advanced Micro Devices |
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13 / 127 page  AMD 9 Am7968/Am7969 swings, which are referenced to +5.0 V. When SERIN– is grounded, the Am7969 is put into Test Mode; SERIN+ becomes a single-ended ECL input, the PLL clock gen- erator is bypassed, and X1 determines the bit rate (rather than the byte rate). Both pins have internal pull down resistors which cause unterminated inputs to stay low. VCC1, VCC2 Power Supply VCC1 and VCC2 are +5.0 volt nominal power supply pins. VCC1 powers TTL I/O, and VCC2 powers internal Logic and Analog circuitry. VLTN Violation (TTL Output) The rising edge of this output indicates that a transmis- sion error has been detected. It changes state at the same time DOi or COi change and will be followed by either DSTRB or CSTRB. This pin goes LOW when the next valid byte is decoded. X1, X2 Crystal Oscillator Inputs (Inputs) These two crystal input pins connect to an internal paral- lel/mode oscillator which oscillates at the fundamental frequency external crystal. During normal operation, the byte rate is set by the crystal frequency. Alternatively, X1 can be driven by an external frequency source. In multiple TAXI systems, this external source could be a TAXI Transmitter’s CLK output or an external TTL fre- quency source. |
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