A6276SA Datasheet, PDF (1/13 Pages) Allegro MicroSystems – 16-Bit Serial Input, Constant-Current Latched LED Driver

A6276
16-Bit Serial Input, Constant-Current
Latched LED Driver
Features and Benefits
▪ Up to 90 mA constant-current outputs
▪ Undervoltage lockout
▪ Low-power CMOS logic and latches
▪ High data input rate
▪ Functional replacement for TB62706BN/BF
Packages
24-pin DIP
(A package)
24-pin TSSOP
with exposed thermal pad
(LP package)
24-pin SOICW
(LW package)
Not to scale
Description
The A6276 is specifically designed for LED-display
applications. Each BiCMOS device includes a 16-bit CMOS
shift register, accompanying data latches, and 16 NPN constant-
current sink drivers. Except for package style and allowable
package power dissipation, the device options are identical.
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 selection of a single resistor.
A CMOS serial data output permits cascaded connections in
applications requiring additional drive lines. For inter-digit
blanking, all output drivers can be disabled with an ENABLE
input high. Similar 8-bit devices are available as the A6275.
Three package styles are provided: through-hole DIP (suffix A),
surface-mount SOIC (suffix LW), and TSSOP with exposed
thermal pad (suffix LP). In normal applications, the copper
leadframe and low logic-power dissipation of the DIP allow it
to sink maximum rated current through all outputs continuously
over the operating temperature range (90 mA, 0.75 V drop,
85°C). All packages are lead (Pb) free, with 100% matte tin
leadframe plating.
Functional Block Diagram
26185.201H