A6278ELPTR-T Allegro Microsystems Inc, A6278ELPTR-T Datasheet

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A6278ELPTR-T

Manufacturer Part Number
A6278ELPTR-T
Description
IC,Laser Diode/LED Driver,BICMOS,TSSOP,16PIN,PLASTIC
Manufacturer
Allegro Microsystems Inc
Type
Linear (Non-Switching)r
Datasheet
1.A6279EETTR-T.pdf (18 pages)

Specifications of A6278ELPTR-T

Constant Current
Yes
Topology
8-Bit Shift Register
Number Of Outputs
8
Internal Driver
Yes
Type - Primary
General Purpose
Frequency
25MHz
Voltage - Supply
3 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
75.5mA
Internal Switch(s)
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Efficiency
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
620-1263-2
A6278ELPTR-T
Features and Benefits
▪ 3.0 to 5.5 V logic supply range
▪  S chmitt trigger inputs for improved noise immunity
▪ Power-On Reset (POR)
▪ Up to 90 mA constant-current sinking outputs
▪ LED open circuit detection
▪ Low-power CMOS logic and latches
▪ High data input rate
▪ 20 ns typical staggering delay on the outputs
▪ Internal UVLO and thermal shutdown (TSD) circuitry
Packages:
28 pin QFN (suffix ET)
16 and 24 pin DIP (suffix A)
16 and 24 pin TSSOP (suffix LP)
16 and 24 pin SOIC (suffix LW)
Not to scale
6278-DS, Rev. 10
SUPPLY
OUTPUT
ENABLE
DATA IN
ENABLE
SERIAL
CLOCK
LATCH
LOGIC
REXT
V
DD
Exposed Pad
(ET and LP packages)
Control Logic
Block
Functional Block Diagram
Regulator
LED Drivers with Open LED Detection
Serial-Input Constant-Current Latched
I
O
V
DD
Output Control Drivers and Open Circuit Detector
OUT0 OUT1
UVLO
Description
The A6278 and A6279 devices are specifically designed for
LED display applications. Each of these BiCMOS devices
includes a CMOS shift register, accompanying data latches,
and NPN constant-current sink drivers. The A6278 contains
8 sink drivers, while there are 16 in the A6279.
The CMOS shift register and latches allow direct interfacing
with microprocessor-based systems. With a 3.3 or 5 V logic
supply, typical serial data-input rates can reach up to 25 MHz.
The LED drive current is determined by the user’s selection of
a single resistor. A CMOS serial data output permits cascading
between multiple devices in applications requiring additional
drive lines. Open LED connections can be detected and signaled
back to the host microprocessor through the SERIAL DATA
OUT pin.
Four package styles are provided: a QFN surface mount,
0.90 mm overall height nominal (A6279 only); a DIP (type A)
for through-hole applications; and for leaded surface-mount, an
SOIC (type LW) and a TSSOP with exposed thermal pad (type
LP). All package styles for the A6278 are electrically identical
to each other, as are the A6279 package styles. All packages
are lead (Pb) free, with 100% matte tin plated leadframes.
Serial - Parallel Shift Register
Latches
A6278
OUT7 (A6278)
OUT15 (A6279)
and
SERIAL
DATA OUT
GND
V
LED
A6279

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A6278ELPTR-T Summary of contents

Page 1

Features and Benefits ▪ 3.0 to 5.5 V logic supply range ▪  S chmitt trigger inputs for improved noise immunity ▪ Power-On Reset (POR) ▪ constant-current sinking outputs ▪ LED open circuit detection ▪ Low-power ...

Page 2

... A6278 and A6279 Selection Guide Part Number Packing 1 A6278EA-T 25 pieces per tube A6278ELPTR-T 1 4000 pieces per 13-in. reel A6279ELPTR-T 4000 pieces per 13-in. reel A6279ELWTR-T 2 1000 pieces per 13-in. reel A6279EETTR-T 1500 pieces per 7-in. reel 1 Variant is in production but has been determined to be LAST TIME BUY. This classification indicates that the variant is obsolete and notice has been given ...

Page 3

A6278 and A6279 Package A, LW, LP 16-pin GND 1 SERIAL DATA IN 2 CLOCK 3 LATCH ENABLE 4 EP OUT0 5 OUT1 6 7 OUT2 8 OUT3 OUTPUT ENABLE Terminal List Table Number A, LW A6278 A6279 ...

Page 4

A6278 and A6279 OPERATING CHARACTERISTICS Characteristic ELECTRICAL CHARACTERISTICS valid at T LOGIC SUPPLY Voltage Range Undervoltage Lockout Output Current (any single output) Output Current Matching (difference between any two outputs at the same Output Leakage Current Logic ...

Page 5

A6278 and A6279 Serial Shift Register Contents Clock Data Input … I Input n … n … n ...

Page 6

A6278 and A6279 CLOCK SERIAL DATA IN t SU(D) SERIAL DATA OUT LATCH ENABLE A6278 A6279 OUTPUT ENABLE OUT0 OUT1 Logic Levels: V and GND DD OUTn LED Open Circuit Detection (Test) Mode Timing ...

Page 7

A6278 and A6279 Normal Mode Serial data present at the SERIAL DATA IN to the shift register on the logic 0-to-logic 1 transition of the CLOCK input pulse. On succeeding CLOCK pulses, the register shifts data towards the SERIAL DATA ...

Page 8

A6278 and A6279 Constant Current (R ) EXT The A6278 and A6279 allow the user to set the magnitude of the constant current to the LEDs. Once set, the current remains constant regardless of the LED voltage variation, the supply ...

Page 9

A6278 and A6279 Undervoltage Lockout The A6278 and A6279 include an internal under-voltage lockout (UVLO) circuit that disables the outputs in the event that the logic supply voltage drops below a minimum acceptable level. This feature prevents the display of ...

Page 10

A6278 and A6279 Load Supply Voltage (V ) LED These devices are designed to operate with driver voltage drops ( 0.7 to 3V, with an LED forward voltage 1 higher voltages are ...

Page 11

A6278 and A6279 Allowable Output Current versus Duty Cycle, A6278 A Package 25° (%) LP Package 25° (%) LW Package 25° ...

Page 12

A6278 and A6279 Allowable Output Current versus Duty Cycle, A6279 A Package 25° (%) LP Package 25° (%) LW Package 25° ...

Page 13

A6278 and A6279 Characteristic Symbol Package Thermal Resistance R θJA *Additional thermal information is available on the Allegro Web site. A6278 5.0 4.0 3.0 2.0 1 100 Ambient Temperature, T Serial-Input, Constant-Current Latched LED Drivers with ...

Page 14

A6278 and A6279 1.27 MIN +0.25 1.52 –0. 1.27 MIN +0.25 1.52 –0.38 Serial-Input, Constant-Current Latched LED Drivers with Open LED Detection Package A, 16-pin DIP (A6278) 19.05±0.25 +0.76 +0.38 6.35 10.92 ...

Page 15

A6278 and A6279 Package LP, 16-pin TSSOP with Exposed Thermal Pad (A6278) 5.00 ±0. 3.00 16X 0.10 C +0.05 0.65 0.25 –0.06 Serial-Input, Constant-Current Latched LED Drivers with Open LED Detection 4° ±4 +0.05 0.15 ...

Page 16

A6278 and A6279 Package LP, 24-pin TSSOP with Exposed Thermal Pad (A6279) 7.80 ±0. 4.32 24X 0.10 C +0.05 0.25 0.65 –0.06 Serial-Input, Constant-Current Latched LED Drivers with Open LED Detection 4° ±4 +0.05 0.15 ...

Page 17

A6278 and A6279 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, gate burrs, and dambar protrusions Exact case and lead configuration at ...

Page 18

A6278 and A6279 29X 0.08 C +0.05 0.25 –0.07 +0.20 0.55 –0. Copyright ©2005-2010, Allegro MicroSystems, Inc. The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, ...

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