HYM8563 → RV-8564
Cross-reference / replacement · Haoyu (HYM) → Micro Crystal
- Interface:
- I²C (up to 400 kHz)
- Oscillator:
- Integrated 32.768 kHz
- Compatibility:
- PCF8563 register-compatible
- Timekeeping Current:
- ~250 nA @ 3V
Compatibility & sourcing notes
The HYM8563 is a PCF8563-compatible clone (same I²C address 0x51/A2h, same 16-register map, shares the Linux pcf8563 driver); the RV-8564 is likewise PCF8563-compatible (A2h/A3h, identical register map), so existing PCF8563/HYM8563 firmware runs unchanged. It is software-compatible but not a footprint drop-in: the RV-8564 is a self-contained SMD module with embedded 32.768kHz crystal, so the PCB must be re-laid for the module (and the external crystal removed).
Registers and interface are similar and firmware largely ports, but the package/pinout differs — re-layout and validate in your design.
Frequently asked questions
Can RV-8564 replace the HYM8563? ▾
The HYM8563 is a PCF8563-compatible clone (same I²C address 0x51/A2h, same 16-register map, shares the Linux pcf8563 driver); the RV-8564 is likewise PCF8563-compatible (A2h/A3h, identical register map), so existing PCF8563/HYM8563 firmware runs unchanged. It is software-compatible but not a footprint drop-in: the RV-8564 is a self-contained SMD module with embedded 32.768kHz crystal, so the PCB must be re-laid for the module (and the external crystal removed).
What should I check when replacing the HYM8563? ▾
Registers and interface are similar and firmware largely ports, but the package/pinout differs — re-layout and validate in your design.
Is the RV-8564 in stock, and can I get a quote? ▾
JLink Technology is an authorized distributor and supplies RV-8564 with stock, pricing, and lead time. Click "Request a Quote" with your quantity and we reply within one business day.