A6278ELW-T

A6278ELW-T Datasheet

A6278 and A6279

Part	Datasheet
A6278ELW-T	A6278ELW-T (pdf)

Related Parts	Information
A6279ELW-T	A6279ELW-T
A6278EA-T	A6278EA-T
A6278ELP-T	A6278ELP-T
A6279EA-T	A6279EA-T
A6279ELP-T	A6279ELP-T
A6278ELPTR-T	A6278ELPTR-T
A6279EETTR-T	A6279EETTR-T
A6279ELPTR-T	A6279ELPTR-T
A6279ELWTR-T	A6279ELWTR-T
A6278ELWTR-T	A6278ELWTR-T

PDF Datasheet Preview
A6278 and A6279 Serial-Input Constant-Current Latched LED Drivers with Open LED Detection to V logic supply range Schmitt 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 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 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, 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. Not to scale LOGIC SUPPLY SERIAL DATA IN CLOCK OUTPUT ENABLE LATCH ENABLE Functional Block Diagram UVLO VDD Control Logic Block Serial - Parallel Shift Register Latches SERIAL DATA OUT REXT IO Regulator Exposed Pad ET and LP packages Output Control Drivers and Open Circuit Detector OUT0 OUT1 OUT7 A6278 OUT15 A6279 VLED A6278 and A6279 Serial-Input, Constant-Current Latched LED Drivers with Open LED Detection Selection Guide Packing Package Type Terminals LED Drive Lines A6278EA-T1 25 pieces per tube A6278ELPTR-T1 4000 pieces per 13-in. reel TSSOP with exposed thermal pad A6279ELPTR-T 4000 pieces per 13-in. reel TSSOP with exposed thermal pad A6279ELWTR-T2 1000 pieces per 13-in. reel SOICW A6279EETTR-T 1500 pieces per 7-in. reel MLP surface mount 1Variant 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. Sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Status date change November 1, Deadline for receipt of LAST TIME BUY orders is April 30, Recommended substitute A6279. 2Variant 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. Sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Status date change May 3, Deadline for receipt of LAST TIME BUY orders is October 29, Recommended substitute A6279. Absolute Maximum Ratings Parameter LOGIC SUPPLY Voltage Range Load Supply Voltage Range OUTx Current any single output Ground Current

PDF Datasheet Preview

A6278 and A6279

Serial-Input Constant-Current Latched LED Drivers with Open LED Detection
to V logic supply range Schmitt 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

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 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, 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.

Not to scale

LOGIC SUPPLY

SERIAL DATA IN

CLOCK

OUTPUT ENABLE LATCH ENABLE

Functional Block Diagram

UVLO VDD

Control Logic Block

Serial - Parallel Shift Register Latches

SERIAL DATA OUT

REXT

IO Regulator

Exposed Pad ET and LP packages

Output Control Drivers and Open Circuit Detector

OUT0 OUT1

OUT7 A6278 OUT15 A6279

VLED

A6278 and A6279

Serial-Input, Constant-Current Latched LED Drivers with Open LED Detection

Selection Guide

Packing

Package Type

Terminals

LED Drive Lines

A6278EA-T1
25 pieces per tube

A6278ELPTR-T1 4000 pieces per 13-in. reel TSSOP with exposed thermal pad

A6279ELPTR-T 4000 pieces per 13-in. reel TSSOP with exposed thermal pad

A6279ELWTR-T2 1000 pieces per 13-in. reel SOICW

A6279EETTR-T 1500 pieces per 7-in. reel MLP surface mount
1Variant 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. Sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Status date change November 1, Deadline for receipt of LAST TIME BUY orders is April 30, Recommended substitute A6279. 2Variant 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. Sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Status date change May 3, Deadline for receipt of LAST TIME BUY orders is October 29, Recommended substitute A6279.

Absolute Maximum Ratings

Parameter LOGIC SUPPLY Voltage Range Load Supply Voltage Range OUTx Current any single output

Ground Current

More datasheets: 6017C SL001 | 6017C SL002 | 6017C SL005 | 264-7USOC/S400-A8 | M3272 SL001 | M3272 SL005 | M3272 SL002 | A6279ELW-T | A6278EA-T | A6278ELP-T

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Datasheet ID: A6278ELW-T 516050