A6277

• 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.