LMK1C1104DQFT

Clock Buffers, Drivers Overview

The LMK1C1104DQFT is a 1:4 LVCMOS clock buffer from the Texas Instruments LMK1C110x family, housed in an 8-pin WSON (2.00 mm × 2.00 mm) package. It supports supply voltages of 3.3 V, 2.5 V, and 1.8 V, with maximum operating frequencies of 250 MHz at 3.3 V and 200 MHz at lower voltages. Key electrical parameters include a propagation delay of up to 3 ns, output-output skew under 50 ps, and additive jitter ranging from 7.5 fs typical at 3.3 V to 19.2 fs typical at 1.8 V. The device features synchronous output enable control via the 1G pin and includes fail-safe inputs to prevent oscillation without an input signal.

Clock Buffers, Drivers Feature Summary

• Four LVCMOS outputs with low skew (< 50 ps) and extremely low additive jitter (max 50 fs).
• Synchronous output enable (1G) allows simultaneous switching of all outputs to a low state.
• Fail-safe inputs prevent output oscillation when no input signal is present.
• Operates across a wide temperature range from –40°C to +125°C.

Clock Buffers, Drivers Applications

• Factory automation and control systems
• Telecommunications equipment
• Data center and enterprise computing infrastructure
• Grid infrastructure synchronization

Clock Buffers, Drivers Procurement Notes

Verify the DQF suffix indicates the 8-pin WSON package configuration. Confirm the T suffix corresponds to the small tape-and-reel carrier containing 250 units per reel. Ensure the orderable part number matches the specific voltage and performance grade required for the target application environment.

Clock Buffers, Drivers Selection Notes

Select this component for applications requiring a single-ended LVCMOS input to fan out to four outputs with minimal skew. Compare against LMK1C1102 or LMK1C1103 if fewer outputs are needed, as they share pin compatibility. Consider the LMK1C1104PWR variant if a TSSOP package is preferred over the compact WSON form factor.

Clock Buffers, Drivers Part Context

This device belongs to the LMK1C110x modular clock buffer family, which also includes 1:2, 1:3, 1:6, and 1:8 variants. The family is designed for backward compatibility with the CDCLVC110x series. The LMK1C1104 specifically provides four buffered outputs, distinguishing it from the two-output LMK1C1102 and three-output LMK1C1103 models within the same footprint.

Clock Buffers, Drivers Replacement Considerations

LMK1C1104DQFR (WSON, 3000-unit reel)

Clock Buffers, Drivers FAQ

How does the fail-safe input feature function?

The device incorporates input hysteresis that prevents random oscillation at the outputs in the absence of an input signal. This allows input pins to be left open or driven before VDD is applied without damaging the device.

What is the maximum operating frequency for different supply voltages?

The maximum input/output frequency is 250 MHz when powered by 3.3 V. For 2.5 V and 1.8 V supply voltages, the maximum frequency is limited to 200 MHz.

Can unused outputs on the LMK1C1104 be left unconnected?

Yes, unused LVCMOS outputs can be left floating. This design choice helps reduce overall system component cost and complexity.