NXP Semiconductors MC100ES6139DT

Overview

MC100ES6139DT from Freescale Semiconductor is a 3.3V ECL/PECL/HSTL/LVDS clock generation IC providing synchronous ÷2/4 and ÷4/5/6 division with <50 ps output-to-output skew, >1.0 GHz maximum frequency, and differential ECL/PECL input compatibility. It serves as a low-skew timing source in high-speed serial link transceivers, FPGA clock trees, and telecom line-card synchronization systems.

For engineers reviewing the MC100ES6139DT datasheet, MC100ES6139DT pinout, MC100ES6139DT application, or MC100ES6139DT equivalent, key selection criteria include synchronous enable/disable behavior, master reset for multi-chip alignment, VBB reference output for AC-coupled sinusoidal inputs, and dual-mode operation across ECL (VEE = –3.135 V to –3.8 V) and PECL (VCC = 3.135 V to 3.8 V) supply configurations.

Technical Context

The MC100ES6139DT integrates two independent synchronous divider blocks: one generating ÷2/4 outputs (Q0/Q1 pairs), the other producing ÷4/5/6 outputs (Q2/Q3 pairs), with all common edges precisely aligned due to internal clock domain synchronization. Its internal enable flip-flop is clocked on the falling edge of CLK, ensuring glitch-free transitions during enable/disable cycles.

Startup state is random; therefore, the MR input must be asserted in multi-device systems to guarantee deterministic phase alignment between MC100ES6139DT units. The VBB output provides a stable DC reference at VCC–1.4 V, enabling direct AC coupling of sine-wave sources without external biasing networks.

Key Specifications

Pinout & Package

MC100ES6139DT is housed in a 20-lead TSSOP package (Case 948E-02), 6.5 mm × 4.4 mm footprint, 0.65 mm pitch, with exposed thermal pad for enhanced power dissipation in high-frequency operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock generation applications.

Compared with MC100ES6139DT, MC100EP6139DT delivers higher frequency headroom and lower jitter but demands stricter power integrity; ICS853S01I offers simplified LVDS integration and lower power at the expense of ECL/PECL flexibility and maximum frequency capability.

Availability

MC100ES6139DT is available at Aetrix Electronics and suitable for optical transport network line cards, FPGA-based protocol analyzers, and high-speed data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for MC100ES6139DT 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

Freescale Semiconductor (now part of NXP Semiconductors) was a leading designer of high-performance analog and mixed-signal timing solutions for communications infrastructure and computing platforms.

The MC100ES6139DT belongs to the 100ES ECL/PECL clock generation family, engineered specifically for low-skew, multi-division clock synthesis in telecom, datacom, and test equipment where deterministic phase alignment and sub-100 ps jitter are critical.

FAQ

What is the recommended power supply configuration for MC100ES6139DT in PECL mode?

For PECL operation, MC100ES6139DT requires VCC = 3.135 V to 3.8 V with VEE = 0 V. All four VCC pins and both VEE pins must be externally connected to their respective supplies. Decoupling capacitors (0.1 µF ceramic + 4.7 µF tantalum) should be placed near each VCC/VEE pair to maintain signal integrity at >1 GHz operation. Do not float any supply pin.

How does the synchronous enable (EN) pin prevent runt pulses in MC100ES6139DT?

The EN pin in MC100ES6139DT is synchronized to the falling edge of the internal clock, ensuring that enable/disable transitions occur only when the internal clock is in the LOW state. This eliminates the possibility of generating incomplete clock cycles (runt pulses) during control assertion, a failure mode common in asynchronous clock gates. The specification limits for EN timing are referenced strictly to the negative edge of CLK.

Can MC100ES6139DT accept a single-ended input, and if so, how is it configured?

Yes, MC100ES6139DT supports single-ended inputs. To configure this, connect the VBB output to the CLK input and bypass it to ground with a 0.01 µF capacitor. The internal 75 kΩ pulldown resistor ensures a defined LOW state on the complementary CLK input. This method maintains proper common-mode voltage and avoids false triggering while preserving timing accuracy.

What is the function of the VBB pin on MC100ES6139DT, and why is it critical for AC-coupled sources?

The VBB pin on MC100ES6139DT provides a stable DC reference at VCC–1.4 V, which matches the optimal common-mode voltage for ECL/PECL receivers. When using AC-coupled sinusoidal sources (e.g., crystal oscillators), connecting VBB to the input termination network eliminates the need for external bias resistors, reduces component count, and prevents DC offset drift over temperature - directly improving long-term phase stability in MC100ES6139DT-based clock trees.

Is master reset (MR) required for all MC100ES6139DT applications, or only in specific configurations?

Master reset (MR) is mandatory only in systems using multiple MC100ES6139DT devices to ensure deterministic phase alignment across chips. For single-device applications, MR is optional because the internal divider architecture guarantees synchronization between the ÷2/4 and ÷4/5/6 output groups. However, asserting MR at power-up remains good practice for guaranteed repeatable startup behavior in production systems.