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CMX644AD2 Datasheet(PDF) 4 Page - CML Microcircuits |
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CMX644AD2 Datasheet(HTML) 4 Page - CML Microcircuits |
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4 / 34 page  V22 and Bell 212A Modem CMX644A © 2000 Consumer Microcircuits Limited 4 D/644A/6 1.3 Signal List CMX644A D2/D5/P4 Signal Description Pin No. Name Type 1 XTALN O/P The inverted output of the on-chip oscillator. 2 XTAL/CLOCK I/P The input to the on-chip oscillator, for external Xtal circuit or clock. 3 SERIAL CLOCK I/P The ‘C-BUS’ serial clock input. This clock, produced by the µController, is used for the transfer timing of commands to and from the device. 4 COMMAND DATA I/P The ‘C-BUS’ serial data input from the µController. Data is loaded into this device in 8- bit bytes, MSB (B7) first, and LSB (B0) last, synchronised to the SERIAL CLOCK. 5 REPLY DATA T/S The ‘C-BUS’ serial data output to the µController. The transmission of REPLY DATA bytes is synchronised to the SERIAL CLOCK under control of the CSN input. This 3-state output is held at high impedance when not sending data to the µController. 6 CSN I/P The ‘C-BUS’ data loading control function: this input is provided by the µController. Data transfer sequences are initiated, completed or aborted by the CSN signal. 7 IRQN O/P This output indicates an interrupt condition to the µController by going to a logic ‘0’. This is a ‘wire-ORable’ output, enabling the connection of up to 8 peripherals to 1 interrupt port on the µController. This pin has a low impedance pulldown to logic ‘0’ when active and a high impedance when inactive. An external pull-up resistor is required. 8 TOP O/P The output of the transmit gain control. 9 TXO O/P The output of the line driver amplifier. 10 TXN I/P The inverting input to the line driver amplifier. 11 TXON O/P The inverted output of the line driving amplifier. Pins TXO and TXON provide symmetrical outputs for use with a balanced load to give sufficient Tx line signal levels even at low VDD. |
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