TS7514 Datasheet | STMicroelectronics

DESCRIPTION The TS7514 is an FSK modem which can be programmed for asynchronous half-duplex voiceband munications on a 2-wireline or full duplex PIN CONNECTIONS DIP24 MOD/DTMF MC/BC RTS ENP DGND Tx D PRD XTAL IN XTAL OUT DCD Rx D ZCO 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 AXTL DIP24 PLCC28 PLCC28 MOD/DTMF MC/BC ATXL WLO ATO RTS WLO ATO N/C V+ ENP 5 6 7 8 9 10 11 12 13 14 15 16 17 18 25 24 23 22 21 20 19 V+ AGND VRAO1 RAI1 RAI2 N/C 7514-01.EPS / 7514-02.EPS AGND VRAO1 RAI1 RAI2 RAO2 RFO DGND Tx D PRD N/C XTAL IN XTAL OUT N/C Rx D RAO2 November 1998 1/19 7514-01.TBL Part Number Temperature Range Package PIN DESCRIPTION Name MOD/DMTF Pin Number DIP24 1 PLCC28 1 MODEM or DMTF Operating Mode Selection. Also controls write operations to control registers (if MOD/DMTF = 0 and MC/BC = 0). Digital Control Input. In MODEM mode, it sets transmission mode to main or back channel. It also permits selection of dialing or control registers programming. Request to Send. When RTS = 0, the circuit sends an analog signal to the ATO output. The signal depends on the operating mode selected. When RTS = 1, the signal sent to ATO is suppressed after its first zero crossing. When MOD/DMTF = 0 and MC/BC = 0, the RTS pin acts as a clock for serial data loading into the input register. Serial Register Write Select Input. When ENP = 0, the serial register input is connected to Tx D. When ENP = 1, the register input is connected to PRD. Digital Ground = 0V. All digital signals are referenced to this pin. Digital Input for Transmit or Control Data Digital Input for Control Data. Selected through ENP Crystal Oscillator Input. Can be tied to an external clock generator. f QUARTZ = 3.579MHz. Crystal Oscillator Output Data Carrier Detect Output Digital Receive Data Output Zero Crossing Rx Digital Output (ringing detection) Analog Output for the Receive Signal after...