Features: • 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 ...
C737212M: Features: • 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 ...
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Parameter |
Symbol |
Conditions |
Ratings |
Unit |
Maximum power supply voltage |
VDD max |
0.3 to +6.5 |
V | |
Maximum input voltage |
VIN max |
0.3 to VDD +0.3 |
V | |
Maximum output voltage |
VOUT max |
0.3 to VDD +0.3 |
V | |
Allowable power dissipation |
Pd max |
Ta 70 °C |
250 |
mW |
Minimum load resistance |
PL min |
Between the DTMF and VSS pins |
1 |
k |
Operating temperature |
Topr |
30 to +70 |
°C | |
Storage temperature |
Tstg |
40 to +125 |
°C |
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 andcontrol for a standard independent telephone, including on-hook dialing and a hold function. C737212M also provide a serial I/O interface for connection to a microcontroller.