Kc89c72 Datasheet _top_ Access
The KC89C72 is a ghost in the datasheet library—a functional component with a missing identity. If you are repairing a vintage Korean arcade board or a obscure 80s home computer, do not despair. Treat the KC89C72 , download that original datasheet, and you will have all the electrical and programming information required to get sound out of the chip.
: It is a go-to replacement for repairing old arcade boards or MSX systems.
The is a 3-voice programmable sound generator (PSG) IC. It was manufactured by Microchip Technology (after acquiring GI’s semiconductor division) and also under license by other vendors like GoldStar (now LG) and UMC .
When working directly with modern development architectures like Arduino or retro PCBs, adhering to the standard absolute ratings outlined below prevents component failure. Recommended Value / Range +5.0V DC ( ±plus or minus Standard TTL logic rail Input Clock Frequency 1.0 MHz to 2.0 MHz Typically driven at 1.77 MHz or 2.0 MHz Package Format DIP-40 (Dual In-line Package) Through-hole format Logic Thresholds TTL Compatible ≤is less than or equal to 0.8V, High: ≥is greater than or equal to Register Mapping & Sound Synthesis Control kc89c72 datasheet
Here is the technical bridge:
The most critical section of any datasheet is the pinout diagram. For the KC89C72, the 28-pin configuration is straightforward.
The KC89C72 is housed in a standard package. Below is the absolute pin mapping required when designing printed circuit boards (PCBs) or setting up development environments on breadboards. KC89C72 | In Stock - UTSOURCE.net The KC89C72 is a ghost in the datasheet
The device lacks a built-in oscillator. You must supply an external 1 MHz to 2 MHz square wave using a standard crystal oscillator package or a PWM output from a primary MCU.
The KC89C72 is typically identified as a or a Mass Storage Controller ASIC. It belongs to a family of chips designed during the peak of the personal computer boom (late 1980s to mid-1990s) to reduce the component count on motherboards and expansion cards.
: Set both BC1 = 0 and BDIR = 0 to release the shared bidirectional data lines. : It is a go-to replacement for repairing
| Parameter | Value | | :--- | :--- | | | Programmable Sound Generator (PSG) | | Package | 28-pin DIP (Dual Inline Package) or SOP | | Technology | CMOS (Low power consumption) | | Channels | 3 independent tone channels | | Noise Generator | 1 shared pseudo-random noise source | | Envelope Generator | 1 programmable envelope (can be cycled or single-shot) | | Output | 3-bit D/A converter (digital output, usually via external resistor ladder) | | Clock Frequency | Up to 2 MHz (some clones support up to 4 MHz) | | Supply Voltage (Vdd) | 5V ±10% | | Current Consumption | < 25 mA (typical), < 250 µA (standby) |
: Unlike modern microcontrollers, the KC89C72 does not feature an onboard oscillator circuit. An external active TTL-level clock source between 1 MHz and 2 MHz must be wired straight into Pin 30. A simple RC circuit or a 74HC00 NAND-gate inverter chain can be deployed to step down higher master frequencies.