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ACT4402-I Datasheet(PDF) 2 Page - Aeroflex Circuit Technology |
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ACT4402-I Datasheet(HTML) 2 Page - Aeroflex Circuit Technology |
2 / 7 page Aeroflex Circuit Technology SCD4402 REV A 5/28/99 Plainview NY (516)694-6700 2 provides for the removal of the transmitter output from the line. A logic “1” signal applied to the “INHIBIT” takes priority over the condition of the data inputs and disables the transmitter (See Transmitter Logic Waveform, Figure 1). The Transmitter may be safely operated for an indefinite period with the bus (point A) short circuited at 100% duty cycle. Receiver The Receiver section accepts bi-phase differential data at the input and produces two TTL signals at the output. The outputs are DATA and DATA, and represent positive and negative excursions of the input beyond a pre-determined threshold (See Receiver Logic Waveform, Figure 2). The pre-set internal thresholds will detect data bus signals, point A Figure 5, exceeding 1.20 Volts P-P and reject signals less than 0.6 Volts P-P when used with a transformer (See Figure 5 for transformer data and typical connection). A low level at the RX Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended. DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT Note: DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them, and must be in the same state during off times (both high or low). Figure 1 — Transmitter Logic Waveforms Idealized Figure 2 — Receiver Logic Waveforms Idealized (ACT4402) Note overlap LINE TO LINE INPUT DATA OUT DATA OUT STROBE |
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