Analog Devices Inc./Maxim Integrated MAX9423EHJ

Overview

MAX9423EHJ from Maxim Integrated is a quad differential LVECL-to-LVPECL translator in 32-pin TQFP (5mm × 5mm), designed for high-speed clock and data distribution in telecom backplanes. It delivers 336ps typical propagation delay, 17ps typical channel-to-channel skew, 600–660mV differential output swing at 3.3V VCC, integrated 100Ω differential input impedance, and 50Ω series output termination - enabling direct interface to LVPECL loads without external resistors in base station timing paths.

For engineers reviewing the MAX9423EHJ datasheet, MAX9423EHJ pinout, MAX9423EHJ application, or MAX9423EHJ equivalent, this device is selected for ultra-low-skew clock translation where deterministic jitter <1.0ps(RMS), synchronous/asynchronous mode flexibility via SEL, and guaranteed operation from -40°C to +85°C are critical in DSLAM, central office, and ATE systems.

Technical Context

The MAX9423EHJ implements four independent differential translator channels with dual-mode operation: asynchronous mode (SEL high) routes inputs directly to outputs with 336ps t_P, while synchronous mode (SEL low) latches all channels on the rising edge of CLK with 506ps t_P. Each channel features matched internal 100Ω differential input termination and 50Ω series output drivers with 8.2mA internal current sources.

It operates across split supplies: VEE = -2.0V to -3.6V for LVECL-compatible inputs and VCC = 2.375V to 3.6V for LVPECL outputs referenced to VCC. Differential input voltage range is ±3V, and output common-mode voltage is VCC − 1.5V to VCC − 1.1V - ensuring compatibility with standard LVPECL receiver thresholds.

Key Specifications

Pinout & Package

MAX9423EHJ uses a 32-pin 5mm × 5mm TQFP package with exposed paddle connected to VEE internally. Pin layout supports full differential I/O routing with dedicated VCC (pins 11,17,24,30), GND (pins 14,20,21,27), and VEE (pins 1,8).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad LVECL-to-LVPECL translation applications.

Compared with MAX9422EHJ, MAX9423EHJ reduces component count via integrated 50Ω outputs; versus MC100EP139DG, it supports true bipolar LVECL inputs and achieves lower skew - making it optimal for telecom infrastructure demanding both input compatibility and timing precision.

Availability

MAX9423EHJ is available at Aetrix Electronics and suitable for DSLAM backplane timing, central office clock distribution, and base station transceiver synchronization requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX94423EHJ 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The MAX9420–MAX9423 family was engineered specifically for ultra-low-skew, high-frequency clock and data translation in telecom infrastructure - emphasizing deterministic timing, differential noise immunity, and seamless LVECL-to-LVPECL interoperability.

FAQ

What is the operating temperature range for MAX9423EHJ?

The MAX9423EHJ is specified for continuous operation from -40°C to +85°C ambient temperature. This industrial temperature grade ensures reliable performance in base station cabinets, DSLAM shelves, and central office environments where thermal management is constrained. All AC and DC parameters - including propagation delay, skew, and output swing - are guaranteed across this full range per the datasheet's characterization data.

Does MAX9423EHJ require external termination resistors on its inputs?

No, MAX9423EHJ does not require external input termination resistors. It integrates 100Ω differential input impedance between each IN_/IN_ pair, as confirmed in the "Ordering Information" table and "Detailed Description" section. This eliminates the need for external Thevenin networks or biasing circuits typically required for open-input translators like the MAX9420/MAX9421.

Can MAX9423EHJ operate in both synchronous and asynchronous modes?

Yes, MAX9423EHJ supports both modes via the differential SEL input. When SEL/SEL is high/low, all four channels operate asynchronously with direct input-to-output translation (336ps t_P). When SEL/SEL is low/high, operation becomes synchronous - latching all inputs on the rising edge of CLK (506ps t_P). This dual-mode capability is explicitly documented in the General Description and Functional Diagram.

What are the supply voltage requirements for MAX9423EHJ?

MAX9423EHJ requires two supplies: VEE = -2.0V to -3.6V (for LVECL input compatibility) and VCC = 2.375V to 3.6V (for LVPECL output referencing). GND is at 0V. These ranges are defined in the Absolute Maximum Ratings and DC Electrical Characteristics tables. Operation outside these ranges risks damage or undefined behavior - especially exceeding VEE < -4.1V or VCC > +4.1V.

Is MAX9423EHJ pin-compatible with other devices in the MAX9420–MAX9423 family?

Yes, all MAX9420–MAX9423 variants - including MAX9423EHJ - share identical 32-pin TQFP pinouts and footprint, as shown in the "Pin Configurations" diagram. However, functional differences exist: MAX9423EHJ has integrated 100Ω inputs and 50Ω outputs, whereas MAX9420EHJ has open inputs/outputs and MAX9421EHJ has open inputs with 50Ω outputs. Pin compatibility enables layout reuse, but electrical design must match the specific variant's termination scheme.