Analog Devices Inc./Maxim Integrated MAX9396EHJ+

Overview

MAX9396EHJ+ from Maxim Integrated is a high-speed 2:1 multiplexer and 1:2 demultiplexer with integrated loopback functionality, designed for signal redundancy switching in telecom/datacom backplanes. It supports 1.25Gbps operation, delivers 450mV (min) LVDS differential output swing, and accepts CML/LVPECL/LVDS inputs with common-mode range from +0.6V to (V_CC − 0.05V). It is deployed in central office clock distribution and protection switching systems.

For engineers reviewing the MAX9396EHJ+ datasheet, MAX9396EHJ+ pinout, MAX9396EHJ+ application, or MAX9396EHJ+ equivalent, key selection criteria include guaranteed channel-to-channel skew ≤87ps, 2ps(RMS) max random jitter, fail-safe low-level input detection, and independent LVCMOS/LVTTL enable control per output pair.

Technical Context

The MAX9396EHJ+ implements dual-channel differential signal routing: Channel B performs 2:1 multiplexing using BSEL to select between INB0 and INB1 differential inputs, while Channel A performs 1:2 demultiplexing of INA to OUTA0/OUTA1. Loopback mode-enabled independently via LB_SELA and LB_SELB-cross-connects channels: LB_SELA = V_CC routes INB_x to OUTA_y, and LB_SELB = V_CC routes INA to OUTB.

Its BiCMOS process enables ultra-low jitter performance: 57ps_P-P (typ) pseudorandom bit sequence jitter and 2ps_RMS (max) added random jitter at 625MHz. Input fail-safe circuitry forces differential-low outputs when common-mode voltage drops below +0.6V or inputs are undriven, ensuring robust behavior in fault-tolerant systems.

Key Specifications

Pinout & Package

MAX9396EHJ+ is housed in a 32-pin TQFP package (5mm × 5mm × 1.0mm, pkg code H32-1), RoHS-compliant and lead-free (+ suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed differential multiplexer/demultiplexer applications.

Compared with MAX9396EHJ+, MAX9395EHJ+ reduces integration by omitting demux and loopback-lowering cost but requiring external components for redundancy management; SN65LVDS386DGG offers higher speed but shifts switching intelligence off-chip, increasing design complexity and board area.

Availability

MAX9396EHJ+ is available at Aetrix Electronics and suitable for central office backplane clock distribution, DSLAM redundancy switching, and telecom protection switching systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX9396EHJ+ 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) designs precision analog, mixed-signal, and high-speed interface ICs for demanding industrial, telecom, and computing applications.

The MAX9396EHJ+ belongs to Maxim's high-speed differential switching product line, engineered specifically for fault-resilient clock and data path management in carrier-class infrastructure equipment.

FAQ

What is the maximum data rate supported by the MAX9396EHJ+?

The MAX9396EHJ+ is guaranteed to operate at 1.25Gbps with a 450mV minimum differential output swing under PRBS testing conditions. This rating is validated across the full −40°C to +85°C temperature range and with 150mV minimum differential input amplitude, making it suitable for OC-24/STM-16 telecom interfaces and high-speed datacom links where deterministic jitter must remain below 120ps_P-P.

Does the MAX9396EHJ+ support LVDS input signals?

Yes, the MAX9396EHJ+ differential inputs accept LVDS signals provided the common-mode voltage falls within +0.6V to (V_CC − 0.05V) and the differential voltage exceeds 150mV. While optimized for CML and LVPECL levels, its input stage is compatible with LVDS without level-shifting, and internal 100Ω termination eliminates need for external resistors on the board.

How does the fail-safe feature of the MAX9396EHJ+ behave during undriven inputs?

When inputs are undriven or their common-mode voltage drops below +0.6V, the MAX9396EHJ+'s internal fail-safe circuitry forces all differential outputs into a defined low state (V_OD ≈ 0V). This behavior prevents metastability and ensures predictable signal levels during hot-swap events, cable disconnects, or upstream device power loss-critical for fault-tolerant telecom systems.

Can the MAX9396EHJ+ perform simultaneous loopback on both channels?

Yes, the MAX9396EHJ+ supports fully independent loopback control: LB_SELA governs Channel A (routing INB_x to OUTA_y), and LB_SELB governs Channel B (routing INA to OUTB). Both can be asserted high simultaneously, enabling end-to-end path verification without disrupting normal signal flow-ideal for built-in self-test in protection switching architectures.

What is the purpose of the internal 68kΩ pull-down resistors on INB0, INB1, and INA pins?

The internal 68kΩ pull-down resistors on the MAX9396EHJ+ differential input pins ensure a known DC bias state when those inputs are unconnected or unterminated, preventing floating nodes that could cause excessive current draw or undefined switching behavior. They do not affect AC performance but provide robustness during board bring-up, maintenance, or partial system operation.