S-7040D

The S-7040D decoder IC has been designed in accordance with the CCIR* radio paging code number 1 (POCSAG* code) which can be used for display pager since It processes the POCSAG signal internally and sends the decoded data to an external microprocessor. The S-7040D has a battery saving function which drives signal receiving circuil intermittently. Furthermore the S-7040D can also be used for tone-only pager without microprocessor. Eight kinds of paging tone cadences are generated to valid pagings to make the user know which information is received.(* CCIR: International Radio Consultative Committee, POCSAG: Post Office Code Standardization Advisory Group.)

The features of S-7040D can be summarized as (1)operating voltage: 1.7 to 3.6 (3.0 typ.); (2)current consumption: 50 PA max. (3.0 V); (3)data rate: 512/1200 bps selectable (76kHz crystal), 512bps (32kHz crystal); (4)user address: 4 (2addresses/frame); (5)user frame: 2; (6)four cadences per an address; (7)external elements: crystal oscillator (32 KHz/76 KHz), CG, RF; (8)direct interface to IDROM (S-29131A/S-2913); (9)3 paging signals: Tone, LED, Vibrator; (10)CPU direct interface, CPU control output and reference clock output for CPU (32 KHz or 76 KHz ).

The absolute maximum ratings of S-7040D are (1)power supply voltage VDD: -0.3 to 5.0V; (2)input voltage VIN: VSS-0.3 to VDD + 0.3V; (3)output voltage VOUT: VSS to VDD V; (4)storage temperature Tstg: -40 to + 125°C; (5)operating temperature Topr: -10 to + 70°C.