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9ZML1253E

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2:12 Low-Power PCIe Clock Mux with SMBus Write Protection

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Features

  • SMBus write lock feature; increases system security
  • 2 software-configurable input-to-output delay lines; manage transport delay for complex topologies
  • LP-HCSL outputs with 85Ω Zout; eliminate 48 resistors, save 82mm² of area
  • 12 OE# pins; hardware control of each output
  • 3 selectable SMBus addresses; multiple devices can share the same SMBus segment
  • Selectable PLL bandwidths; minimize jitter peaking in cascaded PLL topologies
  • Hardware/SMBus control of PLL bandwidth and bypass; change mode without power cycle
  • Spread spectrum compatible; tracks spreading input clock for EMI reduction
  • 100MHz PLL mode; UPI support
  • 10mm x 10mm 72-VFQFPN package; small board footprint
Find Other Products in Application-Specific Clocks
9ZML1253E - Block Diagram
9ZML1253E - Pinout
9ZML1253E - Block Diagram
9ZML1253E - Pinout

Description

The 9ZML1253E is a second-generation enhanced performance DB1200ZL derivative. The part is a pin-compatible upgrade to the 9ZML1232B while offering a much-improved phase jitter performance. Fixed external feedback maintains low drift for critical QPI/UPI applications, while each input channel has software adjustable input-to-output delay to ease transport delay management for today's more complex server topologies. The 9ZML1253E has an SMBus Write Lockout pin for increased device and system security.

Parameters

Attributes Value
Temp. Range (°C) -40 to 85°C

Package Options

Pkg. Type Pkg. Dimensions (mm) Lead Count (#) Pitch (mm)
VFQFPN 10.0 x 10.0 x 1.0 72 0.5

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Introducing Renesas’ enhanced PCIe clock buffer family. These PCIe Gen5 clock buffers offer fanout and zero-delay operating modes, supporting both legacy systems and the most complex timing trees within a single device. Unlike many existing solutions, whose performance limitations force their use in fanout buffer mode, these clock buffers meet both PCIe Gen5 and prominent CPU-specific phase jitter requirements in all operating modes. The extremely low 50fs rms PCIe Gen5 additive phase jitter enables multi-level cascading within the strict PCIe Gen5 jitter budget. Renesas’ high-performance oscillators and clock generators provide an ideal clock source for the enhanced PCIe clock buffer family. 

For more information about these PCIe Gen5 clock buffers, visit the PCIe timing page.

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