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A6277: 8-Bit Serial-Input, Constant-Current Latched LED Driver (PDF)
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A6277
8-Bit Serial-Input, Constant-Current Latched LED Driver
This device is in production, however, a currently available next generation replacement part is available.
Date of status change: May 3, 2010.
For existing customer transition, and for new customers or new applications, refer to the A6279.
Features
- Up to 150 mA constant-current outputs
- Undervoltage lockout
- Low-power CMOS logic and latches
- High data input rate
- Similar to Toshiba TD62715FN
- High/low output current function
- Digital dimming control
Description
The A6277 is specifically designed for LED display applications. Each BiCMOS device includes an 8-bit CMOS shift register, accompanying data latches, and eight NPN constant-current sink drivers. Two package styles and two operating temperature ranges are available.
The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 5 V logic supply, typical serial data-input rates are up to 20 MHz. The LED drive current is determined by the user selection of a single resistor. A CMOS serial data output permits cascade connections in applications requiring additional drive lines. For inter-digit blanking, all output drivers can be disabled with an ENABLE input high. In addition, a HIGH/LOW function enables full selected current with the application of a logic low, or 50% selected current with the application of a logic high.
Two package styles are provided, a through-hole DIP (suffix A), and a surface-mount SOIC (LW). The copper leadframe and low logic-power dissipation allow the DIP to sink 122 mA through all outputs continuously over the operating temperature range (1.0 V drop, 85°C). Both packages are lead (Pb) free, with 100% matte-tin leadframe plating.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A6277ELWTR-T | 20-lead SOIC | Yes | view data | -40 °C to 85 °C | pre-eol |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.