From the kc89c72 datasheet, here are the key electrical characteristics at T_A = 25°C, VCC = 5V ±5%:
| Parameter | Min | Typ | Max | Unit | |----------------------|------|-----|------|------| | Supply Voltage (VCC) | 4.75 | 5.0 | 5.25 | V | | Supply Current (ICC) | - | 15 | 30 | mA | | Clock Frequency | 0.5 | 1.0 | 2.0 | MHz | | Input Low Voltage (VIL) | 0 | - | 0.8 | V | | Input High Voltage (VIH) | 2.0 | - | VCC | V | | Output Low Voltage (VOL @ 1.6mA) | - | 0.4 | 0.5 | V | | Output High Voltage (VOH @ -0.4mA) | 2.4 | - | - | V |
Timing requirements (bus control):
The KC89C72 uses three control pins – BC1, BC2, BDIR – to select read/write operations and address/data latches.
Despite the age of this component, several sources still host scanned PDFs of the original datasheet: kc89c72 datasheet
⚠️ Warning: Many free datasheet sites contain incomplete documents or mix pages from the KC89C72 with the AY8910. Verify the header page shows "KC89C72" and the Microchip / GoldStar logo.
On a practical level, the KC89C72 datasheet is a lifeline. Original AY-3-8910 chips have become rare and expensive. But because the Soviet clone is pin-for-pin compatible, modern synth hobbyists and retrocomputer restorers can buy NOS (New Old Stock) KC89C72s on eBay for a fraction of the price. The datasheet is their canonical text, verifying that the strange, Cyrillic-stamped chip from a former Leningrad warehouse will indeed sing in a 1980s arcade board. From the kc89c72 datasheet , here are the
Culturally, the datasheet represents the ultimate triumph of information. During the Cold War, the West controlled the technology; the East controlled the espionage. The KC89C72 is a physical manifestation of that espionage—a chip that should not exist, born from reverse-engineering photos and stolen masks. Yet today, its datasheet floats freely on the internet, a document that unites a Russian engineer in St. Petersburg, a German chiptune musician, and an American hardware hacker in a shared, silent agreement: a square wave is a square wave, regardless of ideology.
A datasheet provides absolute maximum ratings and recommended operating conditions: The KC89C72 uses three control pins – BC1,