The SC9102 chip can be found in old telephones.The SC9102C/D are Tone/Pulse switchable dialer which are fabricated in COMS technology with wide operating voltage for both tone and pulse mode, and consumes very low memory retention current in on hook state.
* Tone/Pulse switchable dialer
* One 32-digit last number redial memory
* Pulse-to-tone (P→T) is provided for PBX operation
* Flash key is available
* Minimum tone duration is 100ms
* Minimum intertone pause is 106ms
* Uses 3.579549MHz crystal or ceramic resonator
* Redial Pause time (0ms)
* Mixed dialing
* Power on reset circuit is provided
* Many options can be selected
Mode (10PPS; 20PPS; Tone)
M/B ratio (40:60;33:66)
Pause time (3.6ms)
* Flash function (RESET)
(P→T) pause time (3.6ms)
Flash time (600/100ms)
Flash pause time (0ms)
* Packaged in 18-pin plastic DIP
You can also find the KA2411 chip in the phone.The KA2410/KA2411 is a bipolar integrated circuit designed for telephone
bell replacement.
• Designed for telephone bell replacement
• Low current drain.
• Small size ‘MINIDIP’ package.
• Adjustable 2-frequency tone.
• Adjustable warbling rate.
• Built-in hysteresis prevents false triggering and rotary dial
‘CHIRPS’.
• Extension tone ringer modules.
• Alarms or other alerting devices.
• External triggering or ringer disable. (KA2410)
• Adjustable for reduced initial supply current. (KA2411)
