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Related Links:

Datasheets:
A6277: 8-Bit Serial-Input, Constant-Current Latched LED Driver (PDF)

Selection Guides:
Power Integrated Circuits,

LED Display Drivers,

Relay/Solenoid Drivers

when this product is updated

Technical Publications:
Constant-Current LED Drivers (PDF)

Press Releases:
Allegro MicroSystems Inc. Offers New LED Display Driver

A6277
8-Bit Serial-Input, Constant-Current Latched LED Driver

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

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A6277EA-T	20-pin DIP	Yes	view data	-40 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A6277ELW-T	20-lead SOIC	Yes	view data	-40 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A6277ELWTR-T	20-lead SOIC	Yes	view data	-40 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.

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.