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LC737212 Datasheet, PDF (1/27 Pages) Sanyo Semicon Device – Telephone Dialer IC with On-Chip Memory for Push- Button Telephones | |||
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Ordering number : EN5203203
CMOS LSI
LC737212, LC737212M
Telephone Dialer IC with On-Chip Memory for Push-
Button Telephones
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
â Pulse mode: VDD = 1.5 to 5.5 V
â DTMF mode: VDD = 2.0 to 5.5 V
⢠Low power operation
â Pulse mode: IDD = 0.5 mA max (VDD = 3.0 V)
â DTMF mode: IDD = 1.0 mA max (VDD = 3.0 V)
⢠Low standby current
â IDR = 0.5 µA max (VDD = 1.0 V)
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
21398RM(OT) No. 5203-1/27
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