Description

The 9ZML1233E/9ZML1253E are second generation enhanced

performance DB1200ZL derivatives. The parts are pin-compatible

upgrades to the 9ZML1232B, while offering much improved phase

jitter performance. A 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

9ZML1233E and 9ZML1253E have an SMBus Write Lockout pin

for increased device and system security.

PCIe Clocking Architectures

▪ Common Clocked (CC)

▪ Independent Reference (IR) with and without spread spectrum

Typical Applications

▪ Servers

▪ Storage

▪ Networking

▪ SSDs

Output Features

▪ 12 Low-Power (LP) HCSL output pairs (1233E)

▪ 12 Low-Power (LP) HCSL output pairs with 85Ω Zout (1253E)

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; eliminate 24 resistors, save 41mm2 of area

(1233E)

▪ LP-HCSL outputs with 85Ω Zout; eliminate 48 resistors, save

82mm2 of area (1253E)

▪ 12 OE# pins; hardware control of each output

▪ 3 selectable SMBus addresses; multiple devices can share

same SMBus segment

▪ Selectable PLL bandwidths; minimizes 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

▪ 10 x 10 mm 72-VFQFPN package; small board footprint

Key Specifications

▪ Cycle-to-cycle jitter < 50ps

▪ Output-to-output skew < 50ps

▪ Input-to-output delay: 0ps default

▪ Input-to-output delay variation < 50ps

▪ Phase jitter: PCIe Gen4 < 0.5ps rms

▪ Phase jitter: UPI > 9.6GB/s < 0.1ps rms

▪ Phase jitter: IF-UPI