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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Microchip Technology MDB1900ZCQZ-TR

Name: MDB1900ZCQZ-TR
Brand: Microchip Technology
SKU: MDB1900ZCQZ-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MDB1900ZCQZ-TR

Manufacturer:: Microchip Technology

Category:: Application Specific Clock/Timing

Package:: 72-VFQFN Exposed Pad

Datasheet:: MDB1900ZCQZ-TR.pdf

Description:: BUFFER 19-OUTPUT

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Product details

Overview

MDB1900ZCQZ-TR from Microchip (formerly Micrel) is a zero-delay clock buffer IC designed for high-speed serial timing distribution in Intel platform server and storage systems. It delivers true 0ps input-to-output delay in PLL mode at 100MHz/133MHz, supports 19 differential HCSL output pairs, and integrates a programmable low-phase-noise PLL for PCIe Gen1/2/3, SATA, SAS, ESI, SMI, and QPI reference clock fanout. It operates across 0°C to +70°C in a 72-pin 10mm × 10mm QFN package.

For engineers reviewing the MDB1900ZCQZ-TR datasheet, MDB1900ZCQZ-TR pinout, MDB1900ZCQZ-TR application, or MDB1900ZCQZ-TR equivalent, this page provides verified technical context, validated pin functions, confirmed jitter performance (≤35ps cycle-to-cycle, ≤0.25ps PCIe Gen3 phase jitter), SMBus-configurable outputs, and industrial-grade thermal specs - all specific to the MDB1900ZCQZ-TR commercial temperature variant.

Technical Context

The MDB1900ZCQZ-TR implements an internal feedback path enabling true zero-delay operation without requiring external PCB trace routing, distinguishing it from legacy DB1900Z-compliant buffers. Its dual-mode architecture supports both PLL-based jitter filtering (with selectable high/low bandwidth) and bypass mode for 0–250MHz fanout.

It accepts a 0.7V HCSL differential input (CLK_IN/CLK_IN#), uses tri-level control pins (HBW_BYPASS_LBW#, 100M_133M#) to configure frequency and loop bandwidth, and provides 19 HCSL-compatible differential output pairs with individual OE# enable control and glitch-free assertion/de-assertion.

Key Specifications

Parameter	Value and Actual Design Meaning
Input-to-output delay (PLL mode)	Fixed at 0ps - enables deterministic timing alignment critical for PCIe Gen3 and QPI interconnects.
Cycle-to-cycle jitter (PLL mode)	<35ps - meets stringent PCIe Gen3 and QPI 9.6Gbps accumulated jitter requirements (<0.15ps).
Output-to-output skew	<35ps - ensures tight skew control across all 19 HCSL output pairs for multi-lane synchronization.
Phase jitter (PCIe Gen3)	0.25ps RMS - validated per Intel-supplied MATLAB scripts using CDR = 10MHz filter profile.
Operating supply	2.5V or 3.3V ±5% - supports dual-voltage system design with 450mA typical operating current.
Ambient temperature range	0°C to +70°C - commercial-grade operation matching the MDB1900ZCQZ-TR ordering suffix.
Package	72-pin 10mm × 10mm QFN - RoHS/GREEN/PFOS compliant with exposed thermal pad tied to GND.

Pinout & Package

Package: 72-pin 10mm × 10mm QFN with exposed thermal pad (ePad) connected to ground for electrical and thermal integrity.

Pin/Terminal	Circuit Role	Design Meaning
CLK_IN / CLK_IN#	Differential HCSL clock input	0.7V swing reference input; accepts 100MHz/133MHz with spread-spectrum tolerance (−0.5%).
FB_OUT / FB_OUT#	Internal PLL feedback output	Differential HCSL feedback path - eliminates need for external PCB trace routing per DB1900Z spec.
DIF_0 to DIF_18 (19 pairs)	Differential HCSL clock outputs	19 fully buffered, matched-output pairs; each pair supports 0.7V HCSL logic with <35ps output-to-output skew.
OE_5# to OE_12# (8 pins)	Active-low output enable controls	Glitch-free per-output enable/disable; 50kΩ internal pull-down for default disable on power-up.
SA_0 / SA_1	SMBus address select inputs	Tri-level inputs supporting nine unique SMBus addresses - enables daisy-chaining up to nine devices on one bus.

Key Features

Feature	Design Value
Zero-delay PLL mode	0ps fixed input-to-output delay with internal feedback - removes layout-dependent delay variation and simplifies timing closure.
Selectably tunable PLL bandwidth	Configurable high-bandwidth (2–4MHz) or low-bandwidth (0.7–1.4MHz) modes via HBW_BYPASS_LBW# pin - optimizes jitter filtering for PCIe vs. QPI/SAS.
HCSL-compatible differential outputs	19 output pairs with 0.7V swing, 45–55% duty cycle, and <125ps rise/fall time variation - ensures signal integrity on 85Ω/100Ω controlled-impedance traces.
SMBus interface	Configures output enable states and fine-tunes output delays; supports 9 address options and 5V-tolerant SDA/SCL pins.
Spread-spectrum modulation tolerance	Accepts −0.5% down-spread SSC input (30–33kHz triangular) - reduces EMI without degrading output jitter performance.

Applications

PCI Express Timing (Gen1/2/3)	SATA/SAS Storage Timing
Use Scenario: Distributing 100MHz/133MHz reference clocks to multiple PCIe root ports and endpoints on Intel Romley platform servers. IC Role / Device Role / Timing Role: Zero-delay buffer providing synchronized, low-jitter clock fanout with internal PLL jitter cleanup. Use Value: Enables compliance with PCIe Gen3 phase jitter limit (0.25ps RMS) while maintaining deterministic 0ps delay across all lanes.	Use Scenario: Driving reference clocks to multiple SATA PHYs and SAS expanders in enterprise storage backplanes. IC Role / Device Role / Timing Role: High-fanout HCSL clock distributor supporting 0–250MHz frequencies in bypass or PLL mode. Use Value: Delivers <35ps output-to-output skew across 19 outputs - ensures simultaneous sampling across multi-lane storage interfaces.
Intel QuickPath Interconnect (QPI)	ESI/SMI System Management Timing
Use Scenario: Providing ultra-low-jitter 100MHz clock to QPI links between CPUs and memory controllers in multi-socket servers. IC Role / Device Role / Timing Role: Accumulated jitter optimizer with <0.15ps RMS at 9.6Gbps - meets Intel QPI_SMI specification. Use Value: Reduces bit error rate by suppressing long-term phase accumulation through internal PLL filtering.	Use Scenario: Generating stable 4MHz/16MHz clocks for embedded controller (EC) and system management interrupt (SMI) logic. IC Role / Device Role / Timing Role: Low-power, SMBus-controllable clock source with dedicated OE# pins for dynamic power gating. Use Value: Achieves <0.2ps RMS accumulated jitter at 4MHz - improves reliability of time-critical firmware handshakes.

PCI Express Timing (Gen1/2/3)

SATA/SAS Storage Timing

Use Scenario: Distributing 100MHz/133MHz reference clocks to multiple PCIe root ports and endpoints on Intel Romley platform servers.

IC Role / Device Role / Timing Role: Zero-delay buffer providing synchronized, low-jitter clock fanout with internal PLL jitter cleanup.

Use Value: Enables compliance with PCIe Gen3 phase jitter limit (0.25ps RMS) while maintaining deterministic 0ps delay across all lanes.

Use Scenario: Driving reference clocks to multiple SATA PHYs and SAS expanders in enterprise storage backplanes.

IC Role / Device Role / Timing Role: High-fanout HCSL clock distributor supporting 0–250MHz frequencies in bypass or PLL mode.

Use Value: Delivers <35ps output-to-output skew across 19 outputs - ensures simultaneous sampling across multi-lane storage interfaces.

Intel QuickPath Interconnect (QPI)

ESI/SMI System Management Timing

Use Scenario: Providing ultra-low-jitter 100MHz clock to QPI links between CPUs and memory controllers in multi-socket servers.

IC Role / Device Role / Timing Role: Accumulated jitter optimizer with <0.15ps RMS at 9.6Gbps - meets Intel QPI_SMI specification.

Use Value: Reduces bit error rate by suppressing long-term phase accumulation through internal PLL filtering.

Use Scenario: Generating stable 4MHz/16MHz clocks for embedded controller (EC) and system management interrupt (SMI) logic.

IC Role / Device Role / Timing Role: Low-power, SMBus-controllable clock source with dedicated OE# pins for dynamic power gating.

Use Value: Achieves <0.2ps RMS accumulated jitter at 4MHz - improves reliability of time-critical firmware handshakes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-delay clock buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT8T49N242A	Supports PCIe Gen4 (16GHz), higher integration (integrated VCO), but requires external feedback resistors and lacks tri-level bandwidth selection.	Better suited for next-gen platforms requiring >133MHz operation; less optimized for legacy Romley/QPI designs.	Choose IDT8T49N242A only if Gen4 support, integrated VCO, or wider frequency range (up to 2.1GHz) is required.
Si53302-D-GM	Offers lower phase jitter (0.15ps Gen3), but uses LVDS/LVPECL outputs instead of HCSL and has no internal feedback path.	Requires external termination and PCB trace routing for zero-delay operation - increases layout complexity and skew risk.	Prefer Si53302-D-GM when sub-0.2ps Gen3 jitter is mandatory and HCSL compatibility is not required.

Compared with IDT8T49N242A and Si53302-D-GM, the MDB1900ZCQZ-TR uniquely combines DB1900Z-compliant internal feedback, native HCSL output drive, and tri-level PLL bandwidth control - making it the optimal drop-in replacement for Intel Romley-era server clock trees without layout changes.

Availability

MDB1900ZCQZ-TR is available at Aetrix Electronics and suitable for PCIe Gen3 server motherboard design, SATA/SAS storage backplane timing, and Intel QPI multi-socket CPU interconnects requiring stable component supply and commercial-temperature operation.

Supply support for MDB1900ZCQZ-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology acquired Micrel in 2015 and maintains full support for its high-performance timing portfolio, including zero-delay buffers and clock synthesizers used in datacenter and enterprise infrastructure.

The MDB1900ZC product line was developed specifically for Intel platform timing compliance - delivering DB1900Z-specification performance with integrated feedback, HCSL drive strength, and SMBus configurability for server-class clock distribution.

FAQ

What is the operating temperature range for MDB1900ZCQZ-TR?

The MDB1900ZCQZ-TR is rated for 0°C to +70°C ambient operation, as indicated by the "QZ" suffix in the part number. This commercial temperature grade is distinct from the "QY" variant (−40°C to +85°C). All electrical and jitter specifications - including <35ps cycle-to-cycle jitter and 0.25ps PCIe Gen3 phase jitter - are guaranteed within this 0°C to +70°C range.

Does MDB1900ZCQZ-TR require external feedback components on the PCB?

No. The MDB1900ZCQZ-TR integrates the feedback path internally, with FB_OUT/FB_OUT# pins providing the differential HCSL feedback signal directly from the PLL. Unlike legacy zero-delay buffers, no external trace routing or termination resistors are needed - eliminating layout-dependent delay variation and simplifying compliance with Intel's DB1900Z specification.

How many differential clock outputs does MDB1900ZCQZ-TR support?

The MDB1900ZCQZ-TR provides 19 differential HCSL clock output pairs (DIF_0 through DIF_18), totaling 38 output terminals. Each pair is fully buffered, matched, and capable of driving 100Ω or 85Ω controlled-impedance traces. Eight dedicated OE# pins (OE_5# through OE_12#) allow independent, glitch-free enable/disable control of selected outputs.

Can MDB1900ZCQZ-TR operate with spread-spectrum clock inputs?

Yes. The MDB1900ZCQZ-TR tolerates −0.5% down-spread spectrum modulation on the CLK_IN/CLK_IN# input at 30–33kHz (triangular or Lexmark profile). In PLL mode, it preserves low output jitter - e.g., 0.28ps RMS for PCIe Gen3 under SSCON - while maintaining <35ps cycle-to-cycle jitter and <0.15ps accumulated jitter at 9.6Gbps QPI.

What voltage supplies does MDB1900ZCQZ-TR require?

The MDB1900ZCQZ-TR operates from either 2.5V or 3.3V ±5% supplies, applied to VDDA (core), VDDR (differential input), and VDD (output power) pins. Total operating current is 450mA typical (3.3V) or 350mA typical (2.5V); power-down current drops to 43mA. All supplies must be independently decoupled per the layout guidelines in the datasheet.

MDB1900ZCQZ-TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 72-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: PCI Express (PCIe), SATA CPU

Input:: HCSL

Output:: HCSL

Number of Circuits:: 1

Ratio - Input:Output:: 1:19

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 133.33MHz

Voltage - Supply:: 2.375V ~ 3.465V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 72-QFN (10x10)

MDB1900ZCQZ-TR FAQ

1.How can I place an order for MDB1900ZCQZ-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for MDB1900ZCQZ-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MDB1900ZCQZ-TR reliable?

The price and inventory of MDB1900ZCQZ-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MDB1900ZCQZ-TR is usually 5 days.

3.What payment methods are accepted for MDB1900ZCQZ-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MDB1900ZCQZ-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MDB1900ZCQZ-TR?

MDB1900ZCQZ-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MDB1900ZCQZ-TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MDB1900ZCQZ-TR?

For technical support, including MDB1900ZCQZ-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MDB1900ZCQZ-TR requirements.

6.How does Aetrix verify that MDB1900ZCQZ-TR is sourced from the original manufacturer or authorized distributors?

All MDB1900ZCQZ-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MDB1900ZCQZ-TR meets industry standards.

7.What is the process for return or replacement of MDB1900ZCQZ-TR?

All MDB1900ZCQZ-TR units undergo pre-shipment inspection (PSI). If there is an issue with MDB1900ZCQZ-TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MDB1900ZCQZ-TR part is unused and in its original packaging.

Return procedure for MDB1900ZCQZ-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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