A6275ELW-T Allegro Micro Systems, Inc., A6275ELW-T Datasheet

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A6275ELW-T

Manufacturer Part Number
A6275ELW-T
Description
Manufacturer
Allegro Micro Systems, Inc.
Datasheet
1.A6275ELW-T.pdf (11 pages)
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
Not to scale
26185.200E
GROUND
DATA IN
ENABLE
SERIAL
CLOCK
LATCH
(A package)
16-pin DIP
8-Bit Serial Input Constant-Current Latched LED Driver
OUT
0
OUT
16-pin SOICW
(LW package)
SERIAL-PARALLEL SHIFT REGISTER
1
Functional Block Diagram
OUT
2
LATCHES
Description
The A6275 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 de ter mined 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.
OUT
N
UVLO
REGULATOR
I
O
BIPOLAR
MOS
V
DD
LOGIC
SUPPLY
SERIAL
DATA OUT
OUTPUT ENABLE
(ACTIVE LOW)
R
EXT
A6275
Dwg. FP-013-3

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A6275ELW-T Summary of contents

Page 1

Serial Input Constant-Current Latched LED Driver Features and Benefits ▪ 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 ...

Page 2

... Serial-Input Constant-Current Latched LED Driver A6275 Selection Guide Part Number Package A6275EA-T 16-pin DIP A6275ELW-T 16-pin SOICW A6275ELWTR-T 16-pin SOICW A6275SLW-T 16-pin SOICW A6275SLWTR-T 16-pin SOICW Absolute Maximum Ratings* Characteristic Supply Voltage Input Voltage Range Output Voltage Range Output Current Ground Current ...

Page 3

Serial-Input Constant-Current Latched LED Driver A6275 IN OUTPUT ENABLE (active low Serial Shift Register Contents Input Input ...

Page 4

Serial-Input Constant-Current Latched LED Driver A6275 ELECTRICAL CHARACTERISTICS at T Characteristic Symbol Supply Voltage Range Undervoltage Lockout Output Current (any single output) Output Current Matching (difference between any two outputs at same Output Leakage Current Logic Input ...

Page 5

Serial-Input Constant-Current Latched LED Driver A6275 SWITCHING CHARACTERISTICS 470 Ω mA, V EXT O Characteristic Symbol Propagation Delay Time Propagation Delay Time Output Fall Time Output Rise Time RECOMMENDED OPERATING CONDITIONS Characteristic Symbol ...

Page 6

Serial-Input Constant-Current Latched LED Driver A6275 TIMING REQUIREMENTS and SPECIFICATIONS C 50% CLOCK A B SERIAL DATA 50% DATA SERIAL 50% DATA OUT D LATCH 50% ENABLE OUTPUT LOW = ALL OUTPUTS ENABLED ENABLE OUT N HIGH ...

Page 7

Serial-Input Constant-Current Latched LED Driver A6275 ALLOWABLE OUTPUT CURRENT AS A FUNC TION OF DUTY CYCLE A Package 100 +25° θ 60°C ...

Page 8

Serial-Input Constant-Current Latched LED Driver A6275 ALLOWABLE OUTPUT CURRENT AS A FUNC TION OF DUTY CYCLE (cont.) A Package 100 +85° θ R ...

Page 9

Serial-Input Constant-Current Latched LED Driver A6275 Package A GROUND 1 SERIAL 2 DATA IN CLOCK 3 CK LATCH L 4 ENABLE OUT 5 0 OUT 6 1 OUT 7 2 OUT 8 3 Terminal No. Terminal Name GND 1 2 ...

Page 10

Serial-Input Constant-Current Latched LED Driver A6275 The load current per bit ( set by the external re sis tor shown in the fi gure below. EXT 100 100 200 ...

Page 11

Serial-Input Constant-Current Latched LED Driver A6275 1.27 MIN +0.25 1.52 –0.38 10.30±0. 16X 0.10 C 0.41 ±0.10 1.27 For Reference Only Dimensions in millimeters (reference JEDEC MS-013 AA) Dimensions exclusive of mold flash, ...

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