SY58021UMG Precision Clock Buffer for Antminer E9 E9pro Hashboard Repair

SY58021UMG Precision Clock Buffer | 1:4 LVPECL Fan-Out for Antminer E9 / E9pro Hashboard Repair

The SY58021UMG is a high-speed precision clock buffer specifically used on Antminer E9 and E9pro hashboards for precise clock distribution. Fully differential 1:4 LVPECL fan-out generates four identical copies of the input clock with exceptional consistency — less than 15ps output deviation out of phase across all four outputs, critical for synchronising ASIC chip groups along the hashboard chain.

Headline specs: only 70fs RMS phase jitter (typical), input signal acceptance down to 100mV, multi-format input compatibility (LVPECL, LVDS, CML), 800mV output swing compatible with 100K LVPECL, dual-rail 2.5V / 3.3V supply. The combination of low jitter and high fan-out drives a stable clock to multiple ASIC chip groups simultaneously.

When to Replace the SY58021UMG

• Hashboard scan failure across multiple chip groups — clock distribution broken, all groups downstream of failed buffer lose sync.
• Chip-count mismatch on E9 / E9pro hashboard — buffer feeding one chain dead, that chain reports as missing.
• Jitter visible on scope at the buffer outputs — degraded IC producing too much phase noise for the chip chain to lock.
• Visible damage on the 16-VQFN package — burnt, cracked, or discoloured after a fault event.

SY58021UMG Specifications

FAQ — SY58021UMG Clock Buffer

Q: How do I confirm the clock buffer is the failed part?
A: Scope the buffer's four output pins. Healthy buffer produces four identical clock waveforms with <15ps phase offset between them. Missing output, asymmetric amplitudes, or excessive jitter (visible eye closure) = buffer failed. Check VCC pins first to rule out supply-side issues.

Q: Can I substitute a different fan-out ratio (1:2 or 1:8)?
A: No — the E9 / E9pro hashboard layout is designed for 1:4 fan-out. A 1:2 buffer leaves half the chip groups unfed; a 1:8 doesn't match the load-balancing of the trace layout. Stick with SY58021UMG exactly.

Q: Rework profile?
A: 3×3mm VQFN — small package with thermal pad on the bottom. Preheat the board to 100°C, hot air at 320°C with flux paste. The thermal pad needs full reflow, so allow extra dwell vs a standard QFN.

Q: Bulk pricing for E9 hashboard repair benches?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities on SY58021UMG stock.

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Antminer E9 / E9pro repair benches stocking SY58021UMG clock buffers in tape-and-reel volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.