The A6277x 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 deter- mined by the user’s 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. The first character of the part number suffix determines the device operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and suffix ‘S–’ is -20°C to +85°C. Two package styles are provided for through-hole DIP (suffix ‘–A’) or surface-mount SOIC (suffix ‘–LW’) applications. The copper lead frame and low logic-power dissipation allow the dual in-line package to sink 122 mA through all outputs continuously over the operating temperature range (1.0 V drop, +85°C). Note that the A6277EA (DIP) and the A6277ELW (SOIC) are electrically identical.
The A6277 series is designed for LED‑display applications. Each device contains an 8‑bit CMOS shift register, latches, and eight NPN constant‑current sink drivers. Data can be clocked in at rates up to 20 MHz, and the output current is set by a single external resistor. The driver supports cascade connections and offers a HIGH/LOW function for 50 % current control.
Electrical specifications include a 5 V logic supply, selectable output current up to 150 mA per channel, and operating temperature ranges of –40 °C to +85 °C (suffix E) or –20 °C to +85 °C (suffix S). The device is offered in 20‑pin DIP (A‑suffix) and 20‑pin SOIC (LW‑suffix) packages.
| Supply Voltage Range (Vop) | 4.5 V – 5.5 V |
|---|---|
| Maximum Output Current per Channel | 150 mA |
| Maximum Serial Data Input Rate | 20 MHz |
| Operating Temperature Range (suffix E) | -40 °C to +85 °C |
| Operating Temperature Range (suffix S) | -20 °C to +85 °C |
The driver supports serial data‑input rates up to 20 MHz.
Each device includes eight NPN constant‑current sink drivers.
Suffix E devices operate from –40 °C to +85 °C, while suffix S devices operate from –20 °C to +85 °C.