Texas Instruments LMK6CE04000CDLFT

Overview

LMK6CE04000CDLFT from Texas Instruments is a factory-programmed, ultra-low-jitter LVCMOS bulk-acoustic wave (BAW) oscillator delivering 40.000 MHz output with ±25 ppm total frequency stability over –40°C to +105°C, integrated LDO for –72 dBc PSRR at 500 kHz, and <5 ms start-up time. It serves as a high-stability reference clock for FPGA I/O banks, industrial PLC timing, and PCIe Gen 1–7 root complex clocking in compact embedded systems.

For engineers reviewing the LMK6CE04000CDLFT datasheet, LMK6CE04000CDLFT pinout, LMK6CE04000CDLFT application, or LMK6CE04000CDLFT equivalent, this page delivers verified package mapping (DLF-4 VSON), confirmed 4-pin terminal roles, jitter performance at 40 MHz (RMS: ≤500 fs), supply noise immunity specs, and direct alternatives for LVCMOS clock replacement in temperature-critical designs.

Technical Context

The LMK6CE04000CDLFT implements TI's monolithic BAW resonator co-integrated with fractional-N divider and LVCMOS output driver in a single die, eliminating external crystal and load capacitors. Its internal LDO regulates core voltage independently of VDD rail noise, enabling stable operation under 50 mVpp 500 kHz ripple.

Factory programming fixes output frequency (40.000 MHz), voltage (2.5V–3.3V ±5%), and functional pin configuration (Pin 1 = ST/NC). The device operates across full industrial temperature range (–40°C to +105°C) with guaranteed aging-inclusive stability and supports OE/ST control via logic-level input.

Key Specifications

Pinout & Package

LMK6CE04000CDLFT uses the 4-pin DLF-4 VSON package (2.5 mm × 2.0 mm), optimized for space-constrained PCB layouts and thermal performance in high-density systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVCMOS oscillator applications.

Compared with Si510-40.000M-GR and AK2-40.000MHZ-EV-T, LMK6CE04000CDLFT uniquely combines extended temperature operation, aging-inclusive ±25 ppm stability, and on-die LDO-enabling drop-in replacement of quartz oscillators in thermally aggressive, high-reliability applications without redesigning power delivery.

Availability

LMK6CE04000CDLFT is available at Aetrix Electronics and suitable for industrial automation, FPGA-based test equipment, and PCIe-compliant server platforms requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LMK6CE04000CDLFT 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and clock solutions, with vertically integrated manufacturing including BAW resonator fabrication.

The LMK6x family targets high-speed digital systems needing ultra-low-jitter, crystal-free timing-designed specifically for SERDES reference clocks in telecom, data center, and industrial edge computing.

FAQ

What is the maximum capacitive load supported by LMK6CE04000CDLFT at 40 MHz?

The device supports up to 15 pF capacitive load when operating above 50 MHz; at 40 MHz, it safely drives 30 pF per TI's recommended operating conditions. Exceeding this may increase rise/fall times beyond 1 ns and degrade duty cycle accuracy. Layout best practices require short traces and local 100 nF + 10 nF decoupling at VDD.

Does LMK6CE04000CDLFT require external configuration or programming after soldering?

No. LMK6CE04000CDLFT is factory-programmed with fixed 40.000 MHz output, LVCMOS drive strength, 2.5V–3.3V supply compatibility, and Pin 1 configured as standby (ST) input. No EEPROM writes, I²C commands, or external resistors are needed-it operates immediately upon power application.

How does the integrated LDO affect power supply design?

The internal LDO allows direct connection to noisy DC/DC outputs (e.g., 3.3V buck converter with 50 mVpp ripple), eliminating need for discrete LDOs or ferrite-bead filters. However, VDD still requires 100 nF ceramic + 10 nF high-frequency decoupling placed within 2 mm of the VDD pin to maintain PSRR performance.

Can LMK6CE04000CDLFT be used in place of a 40 MHz quartz crystal + oscillator IC?

Yes-LMK6CE04000CDLFT is a pin-compatible, drop-in replacement for 4-pin LVCMOS crystal oscillators (XO) in same DLF-4 footprint. It removes crystal matching, load capacitor selection, and ESD-sensitive crystal handling, while improving jitter (500 fs vs. typical 1–2 ps) and temperature stability (±25 ppm vs. ±50 ppm).