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Microchip SY75608TWL-TR: An Ultra-Low-Jitter Clock Buffer for the PCIe Gen6 Era
9/17/2026 7:01:09 PM
As PCIe evolves from Gen5 to Gen6, the clock jitter budget has been compressed to an unprecedented level. Microchip Technology's SY75608TWL-TR is an 8-output LP-HCSL fanout buffer designed precisely for this challenge. Its core mission is to achieve near-lossless clock distribution in high-speed serial links.The device's technical highlights begin with jitter performance. In PCIe Gen6 applications, the SY75608TWL-TR provides only 6 fs of additive jitter; for Gen5 it is 10 fs, and for Gen3/4 it is 20 fs. Its integrated jitter from 12 kHz to 20 MHz is 52 fs. Femtosecond-level jitter means the phase noise introduced by the clock buffer is almost negligible, leaving valuable margin in the link budget. The chip supports output frequencies up to 250 MHz. Its inputs are compatible with HCSL, LVDS, PECL, and CML differential signal standards, while its outputs use low-power HCSL (LP-HCSL) with integrated termination resistors, simplifying board-level design.
In terms of application positioning, the SY75608TWL-TR targets cloud computing, high-performance computing, PCIe switches, and PCIe-based solid-state drives. Its 2:8 input-to-output ratio allows a single device to provide clock fanout for multiple PCIe links, offering a significant layout advantage in server motherboards or accelerator card designs. The device uses a 6 mm × 6 mm VQFN-48 package, includes an integrated LDO for power-supply noise rejection, supports 1.8 V / 2.5 V / 3.3 V supply voltages with ±10% tolerance, and operates over a temperature range of -40°C to +105°C.
|
Key Specification |
Value |
|
Additive jitter (PCIe Gen6) |
6 fs |
|
Additive jitter (PCIe Gen5) |
10 fs |
|
Output frequency (max) |
250 MHz |
|
Input-to-output ratio |
2:8 |
|
Supply voltage |
1.8 V / 2.5 V / 3.3 V (±10%) |
|
Operating temperature |
-40°C to +105°C |
|
Package |
VQFN-48 (6 mm × 6 mm) |
Q: What is the difference between the SY75608TWL-TR and an ordinary clock generator?
A: A clock generator creates a clock frequency from a crystal or reference clock, whereas the SY75608TWL-TR is a clock buffer (fanout buffer). It does not generate a new frequency; instead, it copies and distributes one input clock to multiple outputs. Its core value lies in preserving signal integrity during distribution. The lower the additive jitter, the closer the distributed clock quality is to the original input.
Q: Why is an LP-HCSL output important for PCIe designs?
A: Traditional HCSL outputs require external termination resistors at the receiver or driver, which increases BOM cost and layout complexity. The SY75608TWL-TR integrates termination into the output stage, and LP-HCSL consumes less power than standard HCSL. This is especially useful on densely routed server motherboards.
With femtosecond-level jitter, integrated termination, and wide-temperature operation, the SY75608TWL-TR provides a highly reliable clock distribution solution for PCIe Gen5/Gen6 systems and offers clear engineering value in today's high-speed interconnect designs.
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