LTC1694-1CS5#PBF Linear Technology Integrated Circuit (SOT23 (5-Pin)) In Stock
Linear Technology LTC1694-1CS5#PBF is a single-channel I2C/SMBus accelerator IC in a 5-pin SOT-23 package that boosts bus rise times to support 400 kHz Fast Mode over longer cable runs. Operates from 2.7 V to 5.5 V supply with minimal quiescent current. Available from stock with worldwide shipping.
- Manufacturer
- Linear Technology
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- LTC1694-1CS5#PBF Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- I2C/SMBus bus accelerator enabling 400 kHz Fast Mode operation over extended cable lengths that would otherwise limit speed to below 100 kHz
- 2.7 V to 5.5 V supply range compatible with both 3.3 V and 5 V I2C bus systems without level translation
- Compact 5-pin SOT-23 package minimizing board space overhead for bus acceleration in densely populated mixed-signal PCBs
- Actively pulls up SCL and SDA lines to reduce rise time, eliminating the need for large external pull-up resistors on long I2C buses
Applications
The LTC1694-1CS5#PBF is designed to accelerate I2C and SMBus communication in systems where long PCB traces, cables, or high bus capacitance would otherwise limit data rates below 100 kHz Standard Mode. It actively drives the SCL and SDA lines to achieve the fast edge rates required for 400 kHz Fast Mode, making it suitable for industrial sensor networks, system management buses in servers, and multi-board embedded systems. The SOT-23-5 package makes it practical to add per-segment bus acceleration in backplane designs or cable-extended I2C trees without significant board area cost.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1635 |
| YTEOL | 0 |
| Analog IC - Other Type | ANALOG CIRCUIT |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.01 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the LTC1694-1CS5#PBF enable 400 kHz I2C Fast Mode over high-capacitance buses?
The LTC1694-1CS5#PBF actively drives the SCL and SDA lines with a controlled current source to shorten rise times below the 300 ns limit required for 400 kHz Fast Mode I2C operation. Without this acceleration, buses with more than 400 pF total capacitance would have rise times exceeding 1 µs, forcing the bus to operate at 100 kHz or slower Standard Mode.
What supply voltage range does the LTC1694-1CS5#PBF support for mixed 3.3 V and 5 V I2C systems?
The LTC1694-1CS5#PBF operates from a 2.7 V to 5.5 V supply, making it directly compatible with both 3.3 V and 5.0 V I2C bus environments. This wide supply range allows a single part to accelerate buses in 3.3 V microcontroller systems, 5 V industrial controllers, and mixed-voltage SMBus backplane applications without additional level-shifting components.
In which embedded system topologies is the LTC1694-1CS5#PBF most useful as an I2C bus extender?
The LTC1694-1CS5#PBF is most effective in multi-board backplane systems where I2C must traverse connectors and cables adding 100 pF to 1000 pF of parasitic capacitance per segment. It is also valuable in server management buses (SMBus) monitoring dozens of power modules, and in industrial sensor hubs where 8 to 32 sensor nodes are daisy-chained over distances exceeding 1 meter at 400 kHz.
How does LTC1694-1 differ from the standard LTC1694, and when should each be selected?
The LTC1694-1 variant has a higher current drive capability on the pull-up acceleration circuit compared to the base LTC1694, allowing it to overcome larger bus capacitances, typically above 400 pF, while maintaining 400 kHz Fast Mode timing. Designers should select LTC1694-1CS5#PBF when the total I2C bus capacitance exceeds 400 pF or cable length surpasses 1 meter, and use the standard LTC1694 only on lower-capacitance buses under 200 pF.
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