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MAX6968: 8-Port, 5.5V Constant-Current LED Driver Data Sheet (Rev. 2)10/6/2005PDF287K
Overview
Features and Benefits
- 25Mb Industry-Standard 4-Wire Serial Interface at 5V
- 3V to 5.5V Logic Supply
- 8 Constant-Current LED Outputs Rated at 5.5V
- Up to 55mA Continuous Current per Output
- Output Current Programmed by Single Resistor
- 3% Current Matching Between Outputs
- 6% Current Matching Between ICs
- -40°C to +125°C Temperature Range
Product Details
The MAX6968 serial-interfaced LED driver provides eight open-drain, constant-current sinking LED driver outputs rated at 5.5V. The MAX6968 operates from a 3V to 5.5V supply. The MAX6968 supply and the LEDs' supply or supplies may power up in any order. The constant-current outputs are programmed together to up to 55mA using a single external resistor. The MAX6968 operates with a 25Mb, industry-standard, 4-wire serial interface.
The MAX6968 uses the industry-standard shift-register-plus-latch-type serial interface. The driver accepts data shifted into an 8-bit shift register using data input DIN and clock input CLK. Input data appears at the output DOUT eight clock cycles later to allow cascading of multiple MAX6968s. The latch-enable input LE loads the 8 bits of shift register data into an 8-bit output latch to set which LEDs are on and which are off. The output-enable input active-low OE gates all eight outputs on and off, and is fast enough to be used as a PWM input for LED intensity control.
For applications requiring LED fault detection, refer to the MAX6977 data sheet that automatically detects open-circuit LEDs.
For safety-related applications requiring a watchdog timer, refer to the MAX6978 data sheet that includes a fail-safe feature that blanks the display if the serial interface becomes inactive for more than 1s.
The MAX6968 is one of a family of 12 shift-register-plus-latch-type LED drivers. The family includes 8-port and 16-port types, with 5.5V- or 36V-rated LED outputs, with and without open-circuit LED detection and watchdog. All versions operate from a 3V to 5.5V supply, and are specified over the -40°C to +125°C temperature range.
Applications
- Architectural Lighting
- Gaming Features
- Marquee Displays
- Point-of-Order Signs
- Traffic Signs
- Variable Message Signs
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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MAX6968 Reliability Data1/12/2023PDF31K
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX6968AAE+ | Material Declaration | Reliability Data | 16-SSOP-5.3_MM | |
| MAX6968AAE+T | Material Declaration | Reliability Data | 16-SSOP-5.3_MM | |
| MAX6968APE+ | Material Declaration | Reliability Data | Plastic Dual-In-Line, Narrow (0.3in) | |
| MAX6968AUE+ | Material Declaration | Reliability Data | 16-TSSOP_4.4_EP-4.4_MM | |
| MAX6968AUE+T | Material Declaration | Reliability Data | 16-TSSOP_4.4_EP-4.4_MM | |
| Wafer Fabrication Data | MAX6968 Reliability Data |
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