Maker : Allegro MicroSystems
Part No. : A6277EA

  Datasheet PDF : A6277EA.pdf
  Cross Reference : A6277EA Cross Reference
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Shortcut : A6277EA  A6277ELW 

Product Information

6277 8-BIT SERIAL-INPUT, CONSTANTCURRENT LATCHED LED DRIVER 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 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). Data Sheet 26185.202 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 RATINGS Supply Voltage, VDD ...................... 7.0 V Output Voltage Range, VO ............................ -0.5 V to +24 V Output Current, IO ....................... 150 mA Input Voltage Range, VI .................... -0.4 V to VDD + 0.4 V Package Power Dissipation, PD ..................................... See Graph Operating Temperature Range, TA Suffix ‘S-’ ................ -20°C to +85°C Suffix ‘E-’ ................ -40°C to +85°C Storage Temperature Range, TS ........................... -55°C to +150°C Caution: These CMOS devices have input static protection (Class 2) but are still susceptible to damage if exposed to extremely high static electrical charges. FEATURES s s s s s s To 150 mA Constant-Current Outputs Under-Voltage Lockout Low-Power CMOS Logic and Latches High Data Input Rate Similar to Toshiba TD62715FN High/Low Output Current Function Digital “Dim” Control Always order by complete part number, e.g., A6277EA . 6277 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS 2.5 SUFFIX 'A', R θJA = 55°C/W 2.0 1.5 1.0 0.5 SUFFIX 'LW', R θJA = 70°C/W 0 25 50 75 100 125 AMBIENT TEMPERATURE IN °C 150 Dwg. GP-018-1 FUNCTIONAL BLOCK DIAGRAM UVLO CLOCK SERIAL DATA IN LATCH ENABLE LOGIC GROUND SERIAL DATA OUT2 SERIAL DATA OUT 1 OUTPUT ENABLE (ACTIVE LOW) MOS BIPOLAR POWER GROUND POWER GROUND SUB OUT 0 OUT 1 OUT 2 OUT N HIGH/LOW (CURRENT) V DD LOGIC SUPPLY SERIAL-PARALLEL SHIFT REGISTER FF LATCHES IO REGULATOR R EXT Dwg. FP-013-7 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2001, Allegro MicroSystems, Inc. 6277 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER VDD VDD IN IN Dwg. EP-010-11 Dwg. EP-010-12 OUTPUT ENABLE (active low) LATCH ENABLE and HIGH/LOW VDD VDD IN OUT Dwg. EP-063-6 Dwg. EP-010-13 CLOCK and SERIAL DATA IN TRUTH TABLE Serial Shift Register Contents Data Clock Input Input I1 I2 I3 ... IN-1 IN H L X H L R1 R2 ... R1 R2 ... RN-2 ...

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