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Analog Devices Inc./Maxim Integrated MAX9391EHJ
- Part No.:
- MAX9391EHJ
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 32-TQFP
- Datasheet:
-
MAX9391EHJ.pdf
- Description:
- LOGIC LEVEL TRANSLATOR
- Quantity:
- Payment:
- Shipping:
Inventory:371
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Product details
Overview
MAX9391EHJ from Maxim Integrated is a dual 2×2 crosspoint switch IC designed for high-speed differential signal routing in telecom and datacom systems. It accepts LVPECL/CML inputs, delivers LVDS outputs (250mV swing, 1.5GHz bandwidth), features low-level input fail-safe detection, and supports configurable modes including 2:1 mux, 1:2 splitter, and dual repeater - deployed in DSLAM clock distribution and fault-tolerant protection switching.
For engineers reviewing the MAX9391EHJ datasheet, MAX9391EHJ pinout, MAX9391EHJ application, or MAX9391EHJ equivalent, this page delivers verified electrical specs, real-world configuration logic, fail-safe behavior under undriven conditions, and precise package-level layout guidance for high-speed differential trace routing and termination.
Technical Context
The MAX9391EHJ implements two independent 2×2 differential switch channels with separate ASEL/BSEL control inputs per channel and ENA/ENB enable pins per output pair. Its internal architecture supports simultaneous or asymmetric configurations - e.g., Channel A as 2:1 mux while Channel B operates as 1:2 splitter - using LVCMOS/LVTTL logic levels.
It integrates VCC-referenced input fail-safe circuitry optimized for LVPECL/CML signals (common-mode range 0.6V to VCC–0.05V), differential output drivers compliant with TIA/EIA-644 LVDS, and on-chip pull-down resistors (68kΩ to GND) on all differential inputs to ensure defined states when unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Switching Frequency | 1.5GHz - guarantees reliable operation up to 1.34Gbps serial links with PRBS jitter compliance. |
| Differential Output Swing | 250mV (min) into 100Ω - meets TIA/EIA-644 LVDS standard for noise margin and EMI control. |
| Added Random Jitter | 2ps(RMS) max - enables robust clock-and-data recovery (CDR) in high-sensitivity SerDes interfaces. |
| Output-to-Output Skew | 65ps (max) - ensures timing alignment across dual-channel LVDS outputs for synchronous fanout. |
| Supply Voltage Range | 3.0V to 3.6V - compatible with standard 3.3V system rails and allows margin for ripple/noise. |
| Input Fail-Safe Type | Low-level detection - forces differential low output when common-mode voltage drops below 0.6V or inputs are floating (LVPECL/CML optimized). |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial and central-office telecom environments. |
Pinout & Package
The MAX9391EHJ is housed in a 32-pin TQFP (5mm × 5mm, 1.0mm height, H32-1 package code) with exposed pad for thermal management. Pin pitch is 0.8mm; recommended PCB layout includes dedicated ground plane, local 0.1µF + 0.01µF VCC bypassing, and matched 50Ω differential trace routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 17, 21 | ENB1 / ENB0 / ENA1 / ENA0 | LVCMOS/LVTTL enable inputs - drive high to activate corresponding LVDS output pair; internal 435kΩ pulldown ensures safe default-off state. |
| 2–3, 6–7, 18–19, 22–23 | OUTB1 / OUTB0 / OUTA1 / OUTA0 | Differential LVDS output pairs - require 100Ω termination at receiver; noninverting/inverting labels match standard LVDS polarity convention. |
| 10–11, 14–15, 26–27, 30–31 | INB0 / INB1 / INA0 / INA1 | VCC-referenced differential inputs - accept LVPECL/CML; internal 68kΩ pulldown to GND defines idle state and enables fail-safe low output. |
| 12, 16, 28, 32 | BSEL0 / BSEL1 / ASEL0 / ASEL1 | LVCMOS/LVTTL select inputs - configure routing per Table 1 (e.g., BSEL0=VCC selects INB1→OUTB0); internal 435kΩ pulldown sets default to INB0/INA0. |
| 4, 9, 20, 25 | GND | Ground terminals - must connect to solid ground plane; four pins minimize ground loop impedance for high-frequency return paths. |
| 8, 13, 24, 29 | VCC | Power supply inputs - each requires local 0.1µF + 0.01µF ceramic bypass; 0.01µF placed closest to pin for HF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable topology per channel | Supports independent 2×2 crosspoint, 2:1 mux, 1:2 splitter, or dual repeater via ASEL/BSEL logic - eliminates need for multiple discrete switches in modular designs. |
| LVPECL/CML-to-LVDS translation | Accepts VCC-referenced inputs (0.6V to VCC–0.05V common-mode) and outputs standardized LVDS (1.25V common-mode, 250mV swing) - bridges legacy driver families to modern LVDS receivers. |
| Fail-safe low-level input detection | Forces differential low output when inputs float or common-mode falls below 0.6V - prevents undefined states in hot-swap or cable-disconnect scenarios in DSLAM backplanes. |
| Ultra-low deterministic jitter | 82ps(P-P) max added deterministic jitter at 1.34Gbps - preserves eye opening in multi-hop serial links where jitter accumulation is critical. |
| Channel-to-channel skew control | 65ps max tCCS between any two LVDS outputs - enables synchronous clock/data fanout without external deskew circuitry. |
Applications
| DSLAM Clock Distribution | Fault-Tolerant Protection Switching |
|---|---|
Use Scenario: Distributing synchronized clock signals across multiple line cards in a digital subscriber line access multiplexer. IC Role / Device Role / Timing Role: Dual-channel LVPECL-to-LVDS crosspoint switch that routes primary/backup clocks to redundant clock domains while maintaining sub-100ps skew. Use Value: Enables seamless switchover during line-card failure without clock interruption, leveraging independent ENA/ENB enables and fail-safe low output during transition. | Use Scenario: Providing redundant signal paths in central-office backplane systems where single-point failure must not disrupt service. IC Role / Device Role / Timing Role: Configured as dual 2:1 muxes - selects active path while monitoring standby path integrity via loopback diagnostics. Use Value: Achieves <1µs switchover time using LVCMOS control inputs and maintains LVDS signal integrity (250mV swing, 1.5GHz BW) across both paths. |
| High-Speed Data Fanout Buffering | Serial Link Signal Regeneration |
Use Scenario: Replicating high-speed serial data streams (e.g., 1.25Gbps Ethernet) to multiple downstream PHYs in telecom line cards. IC Role / Device Role / Timing Role: Operated as dual 1:2 splitters - reproduces identical differential waveforms on two output pairs with matched propagation delay. Use Value: Delivers 65ps max inter-output skew and 2ps(RMS) random jitter addition - preserves bit-error-rate (BER) in parallel receive paths. | Use Scenario: Restoring degraded LVPECL/CML signals after long PCB traces or connector losses in high-density backplanes. IC Role / Device Role / Timing Role: Used as dual repeater - retimes and reshapes input signals using clean internal LVDS drivers and low-jitter PLL-free architecture. Use Value: Recovers 250mV LVDS output amplitude even with 150mV differential input, extending usable trace length by >30% versus passive routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual differential crosspoint switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9390EHJ | High-level input fail-safe (0.05V to VCC–0.6V common-mode range); optimized for LVDS/HSTL inputs instead of LVPECL/CML. | Suitable for GND-referenced source systems (e.g., FPGA LVDS outputs), not VCC-referenced sources like ECL clock generators. | Select MAX9390EHJ only when interfacing to LVDS or HSTL transmitters; MAX9391EHJ is mandatory for LVPECL/CML sources. |
| SN65LVDS387DGG | Single 2×2 LVDS crosspoint (not dual); no input fail-safe; 800MHz max bandwidth; different pinout and control logic (3-state enable only). | Limited to simpler point-to-point LVDS fanout without redundancy or mixed-signaling support. | Use SN65LVDS387DGG only for cost-sensitive, single-channel LVDS-only applications where fail-safe and bandwidth headroom are not required. |
Compared with MAX9390EHJ, the MAX9391EHJ provides essential low-level fail-safe for VCC-referenced inputs and matches its 1.5GHz performance; versus SN65LVDS387DGG, it offers dual independent channels, fail-safe, higher bandwidth, and flexible topology selection - making it uniquely suited for telecom protection switching and multi-standard signal aggregation.
Availability
MAX9391EHJ is available at Aetrix Electronics and suitable for DSLAM clock distribution, fault-tolerant protection switching, and high-speed data fanout buffering requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX9391EHJ 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 RF solutions for industrial, communications, and computing markets.
The MAX9391EHJ belongs to Maxim's "Anything-to-LVDS" crosspoint switch product line, engineered specifically to bridge diverse differential signaling standards (LVPECL, CML, HSTL, LVDS) into standardized LVDS outputs for clock/data distribution in telecom infrastructure.
FAQ
What input signaling standards does the MAX9391EHJ support?
The MAX9391EHJ supports LVPECL and CML differential inputs, with a specified common-mode voltage range of 0.6V to (VCC – 0.05V). Its internal 68kΩ pulldown resistors and low-level fail-safe detection are optimized for these VCC-referenced standards. It does not support LVDS or HSTL inputs - those require the MAX9390EHJ variant. The MAX9391EHJ maintains full functionality across its −40°C to +85°C operating range.
How does the fail-safe feature operate on the MAX9391EHJ?
The MAX9391EHJ's fail-safe circuitry forces all LVDS outputs to a differential low state when differential inputs are undriven or when their common-mode voltage falls below 0.6V. This behavior is enabled by internal 68kΩ resistors pulling each input to GND, ensuring defined logic states during power-up, hot-swap, or cable disconnect. The MAX9391EHJ implements this low-level detection specifically for LVPECL/CML compatibility - distinct from the high-level detection in the MAX9390EHJ.
Can the MAX9391EHJ be configured as independent switch topologies per channel?
Yes, the MAX9391EHJ supports fully independent configuration of Channel A and Channel B via separate ASEL0/ASEL1 and BSEL0/BSEL1 control inputs. For example, Channel A can be set as a 2:1 mux (ASEL0=VCC, ASEL1=GND) while Channel B operates as a 1:2 splitter (BSEL0=BSEL1=GND), as defined in Table 1 of the datasheet. This flexibility eliminates the need for external logic and enables dynamic reconfiguration in real-time diagnostic or protection scenarios using the MAX9391EHJ.
What is the required termination for MAX9391EHJ LVDS outputs?
The MAX9391EHJ LVDS outputs require a 100Ω differential termination resistor placed directly across the complementary output pair (e.g., OUTA0 to OUTA0) at the receiver inputs. This termination is mandatory for proper signal integrity, amplitude control (250mV swing), and common-mode voltage stabilization (1.25V). Failure to terminate will cause reflections, reduced swing, and increased jitter - degrading performance in 1.5GHz operation. The MAX9391EHJ datasheet specifies 100Ω ±1% tolerance for optimal results.
Does the MAX9391EHJ support DC coupling of differential inputs?
Yes, the MAX9391EHJ supports DC-coupled differential inputs within its specified common-mode range of 0.6V to (VCC – 0.05V). Its internal input stage is designed for direct connection to LVPECL/CML sources without AC coupling capacitors, provided the source's common-mode voltage remains within that window. This simplifies board layout and preserves low-frequency signal content - a key advantage in clock distribution applications where DC stability matters. The MAX9391EHJ's fail-safe behavior remains active under DC-coupled conditions.
MAX9391EHJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Crosspoint Switch
- Circuit:
- 2 x 2:2
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFP (5x5)
MAX9391EHJ FAQ
1.How can I place an order for MAX9391EHJ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9391EHJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX9391EHJ reliable?
The price and inventory of MAX9391EHJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9391EHJ is usually 5 days.
3.What payment methods are accepted for MAX9391EHJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9391EHJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9391EHJ?
MAX9391EHJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9391EHJ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX9391EHJ?
For technical support, including MAX9391EHJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9391EHJ requirements.
6.How does Aetrix verify that MAX9391EHJ is sourced from the original manufacturer or authorized distributors?
All MAX9391EHJ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX9391EHJ meets industry standards.
7.What is the process for return or replacement of MAX9391EHJ?
All MAX9391EHJ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9391EHJ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX9391EHJ part is unused and in its original packaging.
Return procedure for MAX9391EHJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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