SM1126

SM1126 Series NIPPON PRECISION CIRCUITS INC. Melody IC with Built-in SRAM OVERVIEW The SM1126 Series are melody ICs for use in mobile telecommunications equipment. A maximum of 15 melodies can be stored in programmable ROM and one in built-in read/write SRAM. PINOUT (Top View) 8-pin VSOP FEATURES s s OSC SIO SC ST 1 2 3 4 8 7 VSS VDD MTO TEST s s s s s s s 2.0 to 3.6 V supply voltage Maximum of 16 melody selections (15 in ROM + 1 in SRAM) 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). Selectable clock frequencies (fixed for all melodies) External clock input versions (6 frequencies) - 32.768 kHz system: 32.768, 65.536 and 131.072 kHz - 38.4 kHz system: 38.4, 76.8 and 153.6 kHz Built-in RC oscillator versions (1 frequency) - 131.072 kHz 2-pin serial data melody selection and 1-pin melody playback control Parity check function Delivery pattern alarm Power save function External clock input versions Clock gating in non-play modes Built-in RC oscillator versions Oscillator stopped in non-play modes 1126×× 6 5 PACKAGE DIMENSIONS (Unit: mm) 4.4 0.2 6.4 0.3 0.575 TYP 3.1 0.3 1.15 0.05 0.15− 0.05 + 0.1 0.10 D e vice SM1126××V P ackag e 8-pin VSOP 0.1 0.05 ORDERING INFORMATION 0.65 0.22 0.1 + 0.12 M NIPPON PRECISION CIRCUITS—1 0.5 0.2 SM1126 Series BLOCK DIAGRAM OSC OSC Master slice SW1...