News Release from: Allegro MicroSystems Europe
Edited by the Electronicstalk Editorial Team on 28 April 2003
Latched constant-current LED drivers
The new A6275EA and A6275ELW are a range of 8bit serial-input latch constant-current LED driver integrated circuits.
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The new A6275EA and A6275ELW from Allegro MicroSystems are a range of 8bit serial-input latch constant-current LED driver integrated circuits. Each BiCMOS device includes an 8bit CMOS shift register, accompanying data latches, and eight NPN constant-current sink drivers. The CMOS shift register and latches allow direct interfacing with microprocessor-based systems.
With a 5V logic supply, typical serial data-input rates are up to 20MHz.
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 interdigit blanking, all output drivers can be disabled with the 'enable' input high.
Two package styles are provided for through-hole DIP (suffix A) or surface-mount SOIC (suffix LW).
Under normal applications, copper lead frames and low logic-power dissipation allow these devices to sink maximum rated current through all outputs continuously over the operating temperature range (90mA, 0.9V drop, +85C).
All devices are also available for operation over the standard temperature range of -20 to +85C.
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