Datenblatt-Suchmaschine für elektronische Bauteile |
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ST16C552CJ68 Datenblatt(PDF) 6 Page - Exar Corporation |
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ST16C552CJ68 Datenblatt(HTML) 6 Page - Exar Corporation |
6 / 39 page 6 ST16C552/552A Rev. 3.40 Symbol Pin Signal Type Pin Description reached. SLCT 65 I Select (with internal pull-up) - General purpose input or line printer select status. Normally this pin is connected to a printer output (active low) that indicates the ready status of a printer, i.e., on-line and/or on-line and ready. -SLCTIN 58 I/O Select In (open drain, with internal pull-up) - General purpose I/O or line printer select. This pin can be read via Bit-3 in the printer command register, or written via bit-3 in the printer control register. As this pin is open-drain, it can be wire-or’d with other outputs. Normally this signal is connected with a printer to select the printer with an active low. -STROBE 55 I/O Strobe (open drain, with internal pull-up) - General purpose I/O or data strobe output. Normally this output is connected to a printer and indicates that valid data is available at the printer port (PD0-PD7). -TXRDY A/B 22,42 O Transmit Ready A/B (active low). These outputs provide the TX FIFO/THR status for individual transmit channels (A-B). As such, an individual channel’s -TXRDY A-B buffer ready status is indicated by logic 0, i.e., at least one location is empty and available in the FIFO or THR. This pin goes to a logic 1 when there are no more empty locations in the FIFO or THR. VCC 23,40,64 Pwr 2.97 to 5.5V power supply input. All inputs are 5V tolerant except for XTAL1 and all printer port inputs for devices with revision "F" and newer. -CD A/B 29,8 I Carrier Detect (active low) - These inputs are associated with individual UART channels A through B. A logic 0 on this pin indicates that a carrier has been detected by the modem for that channel. -CTS A/B 28,13 I Clear to Send (active low) - These inputs are associated with individual UART channels, A through B. A logic 0 on this pin(s) indicates the modem or data set is ready to accept transmit data from the 552/552A for the given channel. Status can be tested by reading MSR bit-4 for that channel(s). -CTS has no SYMBOL DESCRIPTION |
Ähnliche Teilenummer - ST16C552CJ68 |
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Ähnliche Beschreibung - ST16C552CJ68 |
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