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6277

Allegro MicroSystems
Part Number 6277
Manufacturer Allegro MicroSystems
Description 8-BIT SERIAL-INPUT/ CONSTANTCURRENT LATCHED LED DRIVER
Published Apr 3, 2005
Detailed Description 6277 PRELIMINARY INFORMATION (Subject to change without notice) July 20, 2000 Data Sheet 26185.202 8-BIT SERIAL-INPUT,...
Datasheet PDF File 6277 PDF File

6277
6277

Overview
6277 PRELIMINARY INFORMATION (Subject to change without notice) July 20, 2000 Data Sheet 26185.
202 8-BIT SERIAL-INPUT, CONSTANTCURRENT LATCHED LED DRIVER 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 determined 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).
A6277ELW LOGIC GROUND SERIAL DATA IN CLOCK LATCH ENABLE HIGH/LOW (CURRENT) POWER GROUND OUT 0 OUT 1 OUT 2 OUT 3 1 2 3 4 5 6 SUB VDD IO REGULATOR CK L FF OE 20 19 18 17 16 15 LOGIC SUPPLY REXT SERIAL DATA OUT 1 SERIAL DATA OUT 2 OUTPUT ENABLE POWER GROUND OUT 7 OUT 6 OUT 5 OUT 4 REGISTER LATCHES SUB 7 8 9 10 14 13 12 11 Dwg.
PP-029-17A Note that the A6277EA (DIP) and the A6277ELW (SOIC) are electrically identical and share a common terminal number assignment.
ABSOLUTE MAXIMUM RAT...


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