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LC737212M Datasheet

  • LC737212M

  • Telephone Dialer IC with On-Chip Memory for Push- Button Tel...

  • 27頁

  • SANYO

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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
鈥?Fabrication in a CMOS process that allows these circuits
to be directly operated from a telephone line
鈥?Support for single-contact keypads
鈥?Built-in oscillator circuit (fosc = 3.58 MHz) that can
drive either a standard color-TV crystal oscillator
element or a ceramic resonator
鈥?High-precision DTMF signal
鈥?Frequency generator circuit (鹵0.1%) adopted for eased
ceramic resonator selection
鈥?Five one-touch 16-digit auto-dial memories and 20
quick-dialing memories
鈥?On-hook or off-hook can be specified for memory
entries.
鈥?Mode change and pause data items can be stored in the
dialing memories.
鈥?63-digit redial memory
鈥?Automatic pause (3.9 seconds) insertion when the mode
is switched.
鈥?Automatic pause (1.0 second) insertion after a flash
operation.
鈥?Mode changing is one-directional, from pulse mode to
tone mode.
鈥?Output of a key press tone (1036 Hz, 31 ms) for keys
other than DTMF keys when key input is valid
鈥?Output of an operation complete confirmation tone
(2072 Hz, 279 ms for each telephone number) when a
telephone number is stored in memory
鈥?Generates 12 signal types in DTMF mode.
鈥?Supports an on-hook dialing mode.
鈥?Supports a hold function with hold mode.
鈥?Supports both 10 and 20 pps dialing pulse rates.
鈥?The mode can be switched from either the P/T pin or by
a key input.
鈥?Settable dialing pulse circuit closed ratio (make
percent): either 33% or 39%.
鈥?Supports either keypad or serial input.
鈥?Provides serial output of the keypad input data and the
internal status.
鈥?Capable of controlling the serial output timing.
鈥?Supports 18 user-defined keys.
鈥?Wide operating power-supply voltage range
鈥?Pulse mode: V
DD
= 1.5 to 5.5 V
鈥?DTMF mode: V
DD
= 2.0 to 5.5 V
鈥?Low power operation
鈥?Pulse mode: I
DD
= 0.5 mA max (V
DD
= 3.0 V)
鈥?DTMF mode: I
DD
= 1.0 mA max (V
DD
= 3.0 V)
鈥?Low standby current
鈥?I
DR
= 0.5 碌A max (V
DD
= 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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