|Description||16-Bit Serial-input Latched Constant-current Led Drivers|
|Company||Allegro Micro Systems, Inc.|
|Datasheet||Download A6277ELW datasheet
LOGIC GROUND SERIAL DATA IN CLOCK LATCH ENABLE HIGH/LOW (CURRENT) POWER GROUND OUT 0 OUT 1 OUT 2 OUT
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 5 V logic supply, typical serial data-input rates are 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 to +85°C, and suffix `S' 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 and share a common terminal number assignment.
Supply Voltage, VDD...................... 7.0 V Output Voltage Range, VO............................ +24 V Output Current, IO....................... 150 mA Input Voltage Range, VI.................... V to VDD 0.4 V Package Power Dissipation, PD..................................... See Graph Operating Temperature Range, TA Suffix `S-'................ to +85°C Suffix `E-'................ to +85°C Storage Temperature Range, TS........................... 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
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" ControlAlways order by complete part number, e.g., A6277EA.
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
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts (508) 853-5000 Copyright © 2001, Allegro MicroSystems, Inc.
Serial Shift Register Contents Data Clock Input RN X Serial Latch Data Enable Output Input L = Low Logic (Voltage) Level H = High Logic (Voltage) Level X X... Latch Contents I2 I3...
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