OVERVIEW

The SM1125 series are melody ICs fabricated in NPC’s Molybdenum-gate CMOS for use in mobile telecommunications equipment. A maximum of 16 melodies can be stored in programmable ROM.

FEATURES

■ Maximum of 16 melody selections (with up to 512 steps)

■ Level hold playback mode

■ External reference clock input versions and builtin RC oscillator versions available, set by masterslice option (RC oscillator versions require an external resistor and capacitor).

■ 12 selectable clock frequencies (fixed for all melodies)

• External clock input versions (12 frequencies)

- 32.768kHz system: 32.768, 65.536 and 131.072kHz

- 37.5kHz system: 37.5, 75.0 and 150.0kHz

- 38.4kHz system: 38.4, 76.8 and 153.6kHz

- 48.0kHz system: 48.0, 96.0 and 192.0kHz

• Built-in oscillator versions (4 frequencies)

- 38.4kHz (standard oscillator frequency)

- 32.768kHz

- 37.5kHz

- 48.0kHz

■ 2-pin serial data melody selection and 1-pin melody playback control

■ Power save function

• External clock input versions Clock gating in no-play modes

• Built-in RC oscillator versions Oscillator stopped in no-play modes

■ Molybdenum-gate CMOS process

■ 8-pin plastic VSOP package