DocumentationDatasheet
Design Note
- DN193 - SMBus Accelerator Improves Data Integrity
- DN238 - SOT-23 SMBus Fan Speed Controller Extends Battery Life and Reduces Noise
Reliability Data
Product Selector Card
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Features
- Improves SMBus Rise Time Transition
- Ensures Data Integrity with Multiple Devices
on the SMBus - Improves Low State Noise Margin
- Auto Detect Low Power Standby Mode
- Wide Supply Voltage Range: 2.7V to 6V
- Low Profile (1mm) SOT-23 (ThinSOT™) Package
Typical Application
Description
The LTC™1694 is a dual SMBus active pull-up designed to enhance data transmission speed and reliability under all specified SMBus loading conditions. The LTC1694 is also compatible with the Philips I²C™ Bus.
The LTC1694 allows multiple device connections or a longer, more capacitive interconnect, without compromising slew rates or bus performance, by using two bilevel hysteretic current source pull-ups.
During positive bus transitions, the LTC1694 current sources provide 2.2mA to quickly slew the SMBus line. During negative transitions or steady DC levels, the current sources decrease to 275µA to improve negative slew rate and improve low state noise margins. An auto detect standby mode reduces supply current if both SCL and SDA are high.
The LTC1694 is available in a 5-pin SOT-23 package, requiring virtually the same space as two surface mount resistors.
SOT-23
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1694-1CS5#PBF | SOT | 5 | C | $1.56 | |
| LTC1694-1CS5#TRMPBF | SOT | 5 | C | $1.61 | $1.35 |
| LTC1694-1CS5#TRPBF | SOT | 5 | C | $1.61 | $1.30 |
| LTC1694-1IS5#PBF | SOT | 5 | I | $2.01 | |
| LTC1694-1IS5#TRMPBF | SOT | 5 | I | $2.01 | $1.65 |
| LTC1694-1IS5#TRPBF | SOT | 5 | I | $2.01 | $1.60 |
| LTC1694CS5#PBF | SOT | 5 | C | $1.56 | |
| LTC1694CS5#TRMPBF | SOT | 5 | C | $1.61 | $1.35 |
| LTC1694CS5#TRPBF | SOT | 5 | C | $1.61 | $1.30 |
| LTC1694IS5#PBF | SOT | 5 | I | $2.01 | |
| LTC1694IS5#TRMPBF | SOT | 5 | I | $2.01 | $1.65 |
| LTC1694IS5#TRPBF | SOT | 5 | I | $2.01 | $1.60 |
| LTC1694-1CS5 | SOT | 5 | C | $3.12 | |
| LTC1694-1CS5#TR | SOT | 5 | C | $3.22 | $2.60 |
| LTC1694CS5 | SOT | 5 | C | $3.12 | |
| LTC1694CS5#TR | SOT | 5 | C | $3.22 | $2.60 |
| LTC1694-1IS5#TR | SOT | 5 | I | $4.02 | $3.20 |
| LTC1694IS5 | SOT | 5 | I | $4.02 | |
| LTC1694IS5#TR | SOT | 5 | I | $4.02 | $3.20 |
| LTC1694-1IS5 | SOT | 5 | I | $4.02 | |
| LTC1694-1CS5#TRM | SOT | 5 | C | $3.22 | $2.70 |
| LTC1694-1IS5#TRM | SOT | 5 | I | $4.02 | $3.30 |
| LTC1694CS5#TRM | SOT | 5 | C | $3.22 | $2.70 |
| LTC1694IS5#TRM | SOT | 5 | I | $4.02 | $3.30 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.