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LMKDB1204REXT

The Texas Instruments LMKDB1204REXT is a 2-input, 4-output LP-HCSL clock multiplexer designed for PCIe Gen 1 to Gen 7 applications. It offers extremely low additive jitter and supports flexible power supply voltages.

✓ Total Stock: 1,000 pcs

$ Price Range: $2.23

LMKDB1204REXT Available from 1 distributor

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✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Risen Electronics ✓ Non-Authorised Inventory information	1,000 pcs On Request	1000 pcs	On Request	1	On Request	On Request	On Request	On Request	2026-02-16 21:33:16

LMKDB1204REXT Specifications Quick View

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Category	New Products
Manufacturer Name	Texas Instruments

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LMKDB1204REXT Description

Short technical summary and product information.

The LMKDB1204REXT from Texas Instruments is an ultra-low jitter LP-HCSL clock multiplexer that supports PCIe Gen 1 through Gen 7 architectures. This device is DB2000QL compliant, ensuring adherence to stringent industry standards.

Key electrical characteristics include an additive RMS jitter as low as 2.1fs for PCIe Gen 7, with typical jitter of 31fs (12kHz to 20MHz) at 156.25MHz. It operates with core and output supply voltages of 1.8V or 3.3V, and features an output skew of 50ps. The device supports both common clock (CC) and independent reference (IR) PCIe modes, and can handle input clocks with or without spread spectrum clocking (SSC).

Designed for reliability, the LMKDB1204REXT includes features such as fail-safe inputs, automatic output disable, individual output enable/disable pins, and loss of signal (LOS) detection. The output impedance can be configured for 85Ω or 100Ω. The component is housed in a VQFN (REX) package measuring 4 mm x 4 mm, with an operating temperature range of -40°C to 105°C.

This clock multiplexer is suitable for applications requiring high-speed clock distribution with minimal jitter, such as in servers, networking equipment, and high-performance computing systems.

LMKDB1204REXT Quick Information

Product Type: Clock Multiplexer

Canonical Name: LMKDB1204REXT 2-input 4-output LP-HCSL Clock Multiplexer

Subcategory: Clock Multiplexer

LMKDB1204REXT Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

LMKDB1204REXT Estimated Pricing

Qty	Low	High
1+	$2.23	$2.23

Estimated market price range - modelled values for guidance only, not live distributor offers.

LMKDB1204REXT Features

2-input, 4-output LP-HCSL clock multiplexer.
Supports PCIe Gen 1 to Gen 7 architectures.
Extremely low additive RMS jitter.
Operates at 1.8V or 3.3V supply.
Wide -40°C to 105°C temperature range.

LMKDB1204REXT Applications

High-speed clock distribution.
PCIe Gen 1 to Gen 7 systems.
Servers and networking equipment.
High-performance computing.

LMKDB1204REXT FAQs

7 frequently asked questions generated from this part’s specifications.

What is the supply voltage range for the LMKDB1204REXT?

The core and output supply voltage can be set to 1.8V or 3.3V.

What package is the LMKDB1204REXT available in?

The LMKDB1204REXT is offered in a 16 mm² VQFN package measuring 4mm × 4mm.

What is the operating temperature range?

The operating temperature range is -40°C to 105°C.

How many outputs does the LMKDB1204REXT provide?

It provides four LP-HCSL outputs.

Which PCIe generations does the LMKDB1204REXT support?

It supports PCIe Gen 1 through Gen 7.

What are the input and output signal types?

Both input and output are LP-HCSL (low-power HCSL) types.

What is the additive jitter performance?

Additive jitter is 31fs typical for 12kHz-20MHz and as low as 2.1fs for PCIe Gen 7.