Kc89c72 Datasheet Jun 2026

+---\/---+ GND | 1 40| VCC (+5V) N.C. | 2 39| TEST 1 Analog Ch. B| 3 38| Analog Ch. A Analog Ch. C| 4 37| DA7 DA6 | 5 36| DA5 DA4 | 6 35| DA3 DA2 | 7 34| DA1 DA0 | 8 33| BC2 BC1 | 9 32| BDIR N.C. |10 31| /RESET CHIP |11 30| CLOCK IOA7|12 29| IOB7 IOA6|13 28| IOB6 IOA5|14 27| IOB5 IOA4|15 26| IOB4 IOA3|16 25| IOB3 IOA2|17 24| IOB2 IOA1|18 23| IOB1 IOA0|19 22| IOB0 TEST |20 21| N.C. +--------+ Bus Control Logic

(Channel C Tone Period) : 12-bit value for Channel C's pitch.

: Three onboard digital-to-analog converters convert digital amplitude settings into raw analog audio currents. Master Register Map The KC89C72 features 16 internal, 8-bit control registers ( R15cap R 15 kc89c72 datasheet

The 40-pin layout of the KC89C72 features unique bus control logic designed originally for old-school 8-bit processors. Modern implementations utilize shift registers or direct microcontroller general purpose I/O pins to drive these control states.

You can find current stock and detailed technical documents on distribution sites like UTSource or Jotrin Electronics . KC89C72 | In Stock - utsource +---\/---+ GND | 1 40| VCC (+5V) N

The KC89C72 chip was prominently integrated across Asian electronic ecosystems throughout the 1980s and 1990s. Notable hardware deployment areas include:

Here is a practical reference circuit for prototyping with the KC89C72. A Analog Ch

Do not use datasheets for the YM2149 (Yamaha's clone of the AY-3-8910) without checking. While functionally similar, the YM2149 has slight differences in analog output levels and pin 26 (which is often "TEST" on the YM vs. "I/O" on the AY). Always default to the General Instrument AY-3-8910 datasheet for the KC89C72.

Understanding this register map is critical for programming the KC89C72 — any complete datasheet includes these details with example code.