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Analog Devices Inc. LTC4317IDHC#PBF
- Part No.:
- LTC4317IDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC4317IDHC#PBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:436
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Product details
Overview
LTC4317IDHC#PBF from Analog Devices (formerly Linear Technology) is a dual-channel I²C/SMBus address translator IC that enables coexistence of multiple slave devices with identical hardwired addresses on a single bus. It performs real-time 7-bit address translation via XOR-based configuration using external resistors, supports level translation across 2.5V/3.3V/5V buses, and operates over –40°C to +85°C. It is used in server backplanes and telecom chassis to resolve I²C address conflicts during hot-swap module insertion.
For engineers reviewing the LTC4317IDHC#PBF datasheet, LTC4317IDHC#PBF pinout, LTC4317IDHC#PBF application, or LTC4317IDHC#PBF equivalent, key selection criteria include its dual-output channel architecture, resistor-configurable translation byte (0x00–0x7F), ±4kV HBM ESD rating, stuck-bus timeout (30ms), and compatibility with I²C Fast Mode (400kHz).
Technical Context
The LTC4317IDHC#PBF implements a hardware-based, zero-software-address-translation engine using two independent output channels (SDAOUT1/SCLOUT1 and SDAOUT2/SCLOUT2), sharing a common input bus (SCLIN/SDAIN). Its internal shift register processes incoming 7-bit I²C addresses bit-by-bit against a user-defined translation byte derived from analog voltage thresholds at XORH1/XORL1 and XORH2/XORL2 pins.
It integrates precharge circuitry (1V via 200kΩ) for live insertion, glitch filtering (50–100ns), and automatic recovery from abnormal conditions including stuck-low/high SCL (30ms timeout), premature STOP/START bits, and bus idle detection (120µs). Pass-through mode is activated by pulling XORHn high, bypassing translation while maintaining bus connectivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.25V to 5.5V - Supports level translation between mismatched 2.5V/3.3V/5V I²C domains; VCC must connect to lower supply rail. |
| Max Clock Frequency | 400kHz - Fully compatible with I²C Fast Mode; timing validated under load (100pF, 10kΩ pull-up). |
| Address Translation Range | 127 options (0x00–0x7F) - Achieved via 3-bit upper nibble (XORH) and 4-bit lower nibble (XORL) analog voltage configuration. |
| Stuck Bus Timeout | 30ms (typ) - Automatically reconnects SDAIN–SDAOUT if SCLIN remains static, preventing permanent bus lockup. |
| ESD Rating | ±4kV HBM - Robust protection for hot-swap environments in telecom and server applications. |
| Operating Temperature | –40°C to +85°C - Industrial-grade qualification confirmed by LTC4317I temperature grade marking. |
| Pass Switch RDS(ON) | 1.8Ω (typ @ 5V) - Low on-resistance ensures minimal signal degradation and voltage drop on SCL/SDA paths. |
Pinout & Package
16-lead (5mm × 3mm) plastic DFN package with exposed pad (Pin 17 = GND); RoHS-compliant, lead-free finish (PBF suffix). Pin count optimized via shared input bus (SCLIN/SDAIN) and dual independent output pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16, 17 (GND) | Ground reference | Three GND connections (including exposed pad) ensure low-impedance return path and thermal dissipation. |
| 2 (SCLOUT2), 4 (SCLOUT1) | Output clock line | Drive SCL for downstream slave segments; require external pull-up to local bus supply. |
| 3 (SCLIN) | Input/output clock line | Connects to master-side SCL; bidirectional with internal precharge and glitch filtering. |
| 5 (SDAIN) | Input/output data line | Connects to master-side SDA; bidirectional with internal precharge, glitch filter, and hot-swap isolation. |
| 6 (SDAOUT1), 8 (SDAOUT2) | Output data line | Deliver translated SDA to slave segments; open-drain outputs requiring external pull-up. |
| 7 (READY1), 9 (READY2) | Status indicator | Open-drain ready signals go high after XORH/XORL sampling and bus idle detection; indicate translation readiness. |
| 10 (ENABLE2), 15 (ENABLE1) | Channel enable | Active-high control: low disables translation and disconnects SDA/SCL paths; rising edge triggers reconfiguration. |
| 11 (XORH2), 12 (XORL2), 13 (XORH1), 14 (XORL1) | Translation byte inputs | Analog voltage inputs (referenced to VCC) setting upper/lower nibbles of 7-bit XOR translation byte per channel. |
| 18 (VCC) | Power supply | Single supply input; powers internal logic and pass switches; must be tied to lower of input/output bus voltages. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent translation channels | Enables two separate slave groups (e.g., two plug-in cards) to share one master bus without address collision. |
| Resistor-configurable address translation | Eliminates firmware dependency: 7-bit translation byte set via precision voltage dividers on XORH/XORL pins (1% resistors recommended). |
| Hardware-level hot-swap support | Precharge circuitry (1V/200kΩ) minimizes bus disturbance during live insertion; N1/N2 switches remain off until ENABLE high and bus idle detected. |
| Stuck-bus auto-recovery | Monitors SCLIN for >30ms static state and forces reconnection-critical for unattended telecom/server systems. |
| Pass-through mode | Asserting XORHn high disables translation instantly, allowing general-call addressing (e.g., reset commands) without bus interruption. |
Applications
| Server Backplane I²C Expansion | Telecom Chassis Hot-Swap Modules |
|---|---|
|
Use Scenario: Multiple identical FRU (Field Replaceable Unit) modules with fixed I²C addresses are inserted into a central backplane. IC Role / Device Role / Timing Role: LTC4317IDHC#PBF sits between backplane master and each module's slave bus, translating incoming addresses to unique values per slot. Use Value: Enables deterministic addressing without modifying slave firmware or requiring custom PCB silkscreen labels per slot. |
Use Scenario: Line cards with identical sensor or PMBus power monitor ICs are hot-swapped into a carrier shelf. IC Role / Device Role / Timing Role: LTC4317IDHC#PBF isolates each card's I²C domain and translates master requests to match card-specific slave addresses. Use Value: Prevents bus contention during insertion/removal and eliminates need for software-based address remapping during card discovery. |
| Industrial PLC I/O Expansion | Medical Equipment Sensor Subsystems |
|
Use Scenario: Modular I/O racks use identical ADC or GPIO expander ICs across multiple slots, all connected to one controller I²C bus. IC Role / Device Role / Timing Role: LTC4317IDHC#PBF provides per-slot address translation and bus isolation, enabling plug-and-play expansion. Use Value: Reduces BOM complexity by allowing identical slave modules; simplifies firmware as controller sees unique addresses per slot. |
Use Scenario: Patient monitoring system integrates multiple identical temperature/humidity sensors on separate daughterboards. IC Role / Device Role / Timing Role: LTC4317IDHC#PBF bridges main controller bus to each sensor board, translating addresses and providing ESD-hardened isolation. Use Value: Ensures reliable communication despite repeated sensor board replacement; ±4kV HBM withstands clinical environment ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C address translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4302-2 | Software-configurable (I²C register access), single-channel, includes GPIO and ACC (adaptive clock control). | Requires firmware driver support; better suited for dynamic address reassignment during runtime. | Select LTC4302-2 when address mapping must change under host control; LTC4317IDHC#PBF is preferred for fixed, resistor-set translation with zero software overhead. |
| LTC4307 | Single-channel buffer with 60mV offset, 30ms stuck-bus disconnect/recovery, no address translation capability. | Provides bus buffering and fault recovery only-no address conflict resolution. | Choose LTC4307 only for basic hot-swap buffering where slaves already have unique addresses; LTC4317IDHC#PBF is required when address duplication exists. |
Compared with LTC4302-2 and LTC4307, the LTC4317IDHC#PBF uniquely delivers dual-channel, resistor-programmed address translation without firmware dependency-making it optimal for cost-sensitive, high-reliability systems where slave addresses cannot be modified and hot-swap robustness is mandatory.
Availability
LTC4317IDHC#PBF is available at Aetrix Electronics and suitable for server backplanes, telecom chassis, industrial PLCs, and medical sensor subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4317IDHC#PBF 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
Analog Devices acquired Linear Technology in 2017; Linear pioneered high-performance analog ICs for precision signal conditioning, power management, and interface solutions.
The LTC4317 belongs to Linear's I²C/SMBus infrastructure portfolio, designed specifically to solve physical-layer interoperability challenges-including address conflicts, voltage mismatches, and hot-swap reliability-in dense, modular electronic systems.
FAQ
What is the primary function of the LTC4317IDHC#PBF?
The LTC4317IDHC#PBF is a dual-channel I²C/SMBus address translator that enables multiple slave devices with identical hardwired addresses to coexist on the same bus. It performs real-time 7-bit address translation using external resistors to configure XORH/XORL pins-no software programming is required. The LTC4317IDHC#PBF supports level translation across 2.5V/3.3V/5V domains and operates from –40°C to +85°C.
How does the LTC4317IDHC#PBF handle hot-swap insertion into an active I²C bus?
The LTC4317IDHC#PBF uses internal precharge circuitry (1V via 200kΩ) to minimize bus disturbance during live insertion. Its N1/N2 pass switches remain off until ENABLE is asserted high and the bus is confirmed idle (≥120µs high state or STOP bit). Only then does it connect input and output buses and assert READYn. This prevents SDA/SCL corruption and ensures safe hot-swap operation in telecom and server applications.
Can the LTC4317IDHC#PBF translate addresses for both read and write operations?
Yes, the LTC4317IDHC#PBF translates the full 7-bit I²C address during the START condition, before the R/W bit is transmitted. The translation byte is applied identically for both read and write cycles. The R/W bit passes through unmodified, so the slave responds correctly to both directions-enabling full bidirectional communication without protocol modification.
What is the role of the XORH and XORL pins on the LTC4317IDHC#PBF?
The XORH and XORL pins on the LTC4317IDHC#PBF set the 7-bit address translation byte via analog voltage thresholds. XORH configures the upper 3 bits (a6–a4), and XORL configures the lower 4 bits (a3–a0). Each pin connects to a resistive divider between VCC and GND; specific voltage ratios correspond to binary values per Linear's recommended tables. Pulling XORH high activates pass-through mode, disabling translation.
Does the LTC4317IDHC#PBF support I²C 10-bit addressing or SMBus PEC?
No, the LTC4317IDHC#PBF explicitly does not support I²C 10-bit addressing, SMBus Parity Error Code (PEC), Alert Response Address (ARA), or Address Resolution Protocol (ARP). Its design targets standard 7-bit I²C and SMBus protocols-including Send/Receive Byte, Write/Read Word, Block Transfers, and General Call-but excludes extended features requiring additional address bits or checksum handling.
LTC4317IDHC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Address Translator
- Interface:
- I2C
- Voltage - Supply:
- 2.25V ~ 5.5V
- Supplier Device Package:
- 16-DFN (5x3)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LTC4317IDHC#PBF FAQ
1.How can I place an order for LTC4317IDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4317IDHC#PBF 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 LTC4317IDHC#PBF reliable?
The price and inventory of LTC4317IDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4317IDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC4317IDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4317IDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4317IDHC#PBF?
LTC4317IDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4317IDHC#PBF 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 LTC4317IDHC#PBF?
For technical support, including LTC4317IDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4317IDHC#PBF requirements.
6.How does Aetrix verify that LTC4317IDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4317IDHC#PBF 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 LTC4317IDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC4317IDHC#PBF?
All LTC4317IDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4317IDHC#PBF, 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 LTC4317IDHC#PBF part is unused and in its original packaging.
Return procedure for LTC4317IDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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