A6275EA 데이터 시트보기 (PDF) - Allegro MicroSystems
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A6275EA Datasheet PDF : 12 Pages
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A6275
8-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
▪ Pin-compatible with TB62705CP
Packages
16-pin DIP
(A package)
Not to scale
16-pin SOICW
(LW package)
Description
TheA6275 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.
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 cascade connections in
applications requiring additional drive lines. For inter-digit
blanking, all output drivers can be disabled with an ENABLE
input high. A similar 150 mA output device is available as the
A6277; a similar 16-bit device is available as the A6276.
Two package styles are provided: a through-hole DIP (suffix
A) and a surface-mount SOICW (suffix LW). Under normal
applications, copper leadframes and low logic-power dissipation
allow these devices to sink maximum rated current through
all outputs continuously over the operating temperature range
(90 mA, 0.9 V drop, 85°C). Both packages are lead (Pb) free,
with 100% matte tin leadframe plating.
CLOCK
SERIAL
DATA IN
LATCH
ENABLE
GROUND
Functional Block Diagram
VDD
UVLO
SERIAL-PARALLEL SHIFT REGISTER
LATCHES
MOS
BIPOLAR
LOGIC
SUPPLY
SERIAL
DATA OUT
OUTPUT ENABLE
(ACTIVE LOW)
26185.200F
OUT 0 OUT 1 OUT 2
IO
REGULATOR
OUT N
R EXT
Dwg. FP-013-3
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