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LC737212M Folha de dados(PDF) 1 Page - Sanyo Semicon Device |
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LC737212M Folha de dados(HTML) 1 Page - Sanyo Semicon Device |
1 / 27 page Overview The LC737212 and LC737212M are CMOS LSI telephone dialers for pushbutton telephones. They support both DTMF and pulse dialing. These products include 25 16-digit memories for storing telephone numbers and one 63-digit memory for redialing, and they provide, in a single chip, all the functions required for dialing and control for a standard independent telephone, including on-hook dialing and a hold function. They also provide a serial I/O interface for connection to a microcontroller. Functions • Fabrication in a CMOS process that allows these circuits to be directly operated from a telephone line • Support for single-contact keypads • Built-in oscillator circuit (fosc = 3.58 MHz) that can drive either a standard color-TV crystal oscillator element or a ceramic resonator • High-precision DTMF signal • Frequency generator circuit (±0.1%) adopted for eased ceramic resonator selection • Five one-touch 16-digit auto-dial memories and 20 quick-dialing memories • On-hook or off-hook can be specified for memory entries. • Mode change and pause data items can be stored in the dialing memories. • 63-digit redial memory • Automatic pause (3.9 seconds) insertion when the mode is switched. • Automatic pause (1.0 second) insertion after a flash operation. • Mode changing is one-directional, from pulse mode to tone mode. • Output of a key press tone (1036 Hz, 31 ms) for keys other than DTMF keys when key input is valid • Output of an operation complete confirmation tone (2072 Hz, 279 ms for each telephone number) when a telephone number is stored in memory • Generates 12 signal types in DTMF mode. • Supports an on-hook dialing mode. • Supports a hold function with hold mode. • Supports both 10 and 20 pps dialing pulse rates. • The mode can be switched from either the P/T pin or by a key input. • Settable dialing pulse circuit closed ratio (make percent): either 33% or 39%. • Supports either keypad or serial input. • Provides serial output of the keypad input data and the internal status. • Capable of controlling the serial output timing. • Supports 18 user-defined keys. • Wide operating power-supply voltage range — Pulse mode: VDD = 1.5 to 5.5 V — DTMF mode: VDD = 2.0 to 5.5 V • Low power operation — Pulse mode: IDD = 0.5 mA max (VDD = 3.0 V) — DTMF mode: IDD = 1.0 mA max (VDD = 3.0 V) • Low standby current —IDR = 0.5 µA max (VDD = 1.0 V) CMOS LSI Ordering number : EN5203203 21398RM(OT) No. 5203-1/27 SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN Telephone Dialer IC with On-Chip Memory for Push- Button Telephones LC737212, LC737212M |
Nº de peça semelhante - LC737212M |
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Descrição semelhante - LC737212M |
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