A6277ELW

A6277ELW Datasheet

A6277 8-Bit Serial Input Constant-Current Latched LED Driver

Part	Datasheet
A6277ELW	A6277ELW (pdf)

Related Parts	Information
A6277ELWTR-T	A6277ELWTR-T
A6277ELWTR	A6277ELWTR
A6277ELW-T	A6277ELW-T
A6277EA	A6277EA
A6277EA-T	A6277EA-T

PDF Datasheet Preview
A6277 8-Bit Serial Input Constant-Current Latched LED Driver Up to 150 mA constant-current outputs Undervoltage lockout Low-power CMOS logic and latches High data input rate Similar to Toshiba TD62715FN High/low output current function Digital dimming control Packages 20-pin DIP A package 20-pin SOICW LW package Not to scale The A6277 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. Two package styles and two operating temperature ranges are available. 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. In addition, a HIGH/LOW function enables full selected current with the application of a logic low, or 50% selected current with the application of a logic high. Two package styles are provided, a through-hole DIP suffix A , and a surface-mount SOIC LW . The copper leadframe and low logic-power dissipation allow the DIP to sink 122 mA through all outputs continuously over the operating temperature range V drop, 85°C . Both packages are lead Pb free, with 100% matte-tin leadframe plating. Functional Block Diagram 26185.202F A6277 8-Bit Serial Input Constant-Current Latched LED Driver Selection Guide Packing Package A6277EA-T* 20-pin DIP 18 per tube A6277ELWTR-T 20-pin SOICW 1000 per reel 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 This classification indicates that the variant is obsolete and notice has been given. 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 2, Deadline for receipt of LAST TIME BUY orders is April 30, Absolute Maximum Ratings Characteristic Notes Rating Supply Voltage Output Voltage Range Input Voltage Output Current Operating Ambient Temperature Maximum Junction Temperature Storage Temperature VDD VO VI IO TA TJ max Tstg Range E to 24 to VDD + 150 to 85 150 to 150 * Caution These CMOS devices have input static protection Class 2 but are still susceptible to damage if exposed to extremely high static electrical charges. Units V mA ºC ºC ºC Thermal Characteristics may require derating at maximum conditions, see application information Characteristic Test Conditions*

PDF Datasheet Preview

A6277 8-Bit Serial Input Constant-Current Latched LED Driver

Up to 150 mA constant-current outputs Undervoltage lockout Low-power CMOS logic and latches High data input rate Similar to Toshiba TD62715FN High/low output current function Digital dimming control

Packages
20-pin DIP A package
20-pin SOICW LW package

Not to scale

The A6277 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. Two package styles and two operating temperature ranges are available.

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. In addition, a HIGH/LOW function enables full selected current with the application of a logic low, or 50% selected current with the application of a logic high.

Two package styles are provided, a through-hole DIP suffix A , and a surface-mount SOIC LW . The copper leadframe and low logic-power dissipation allow the DIP to sink 122 mA through all outputs continuously over the operating temperature range V drop, 85°C . Both packages are lead Pb free, with 100% matte-tin leadframe plating.

Functional Block Diagram
26185.202F

A6277
8-Bit Serial Input Constant-Current Latched LED Driver

Selection Guide

Packing

Package

A6277EA-T*
20-pin DIP
18 per tube

A6277ELWTR-T
20-pin SOICW
1000 per reel
*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. 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 2, Deadline for receipt of LAST TIME BUY orders is April 30,

Absolute Maximum Ratings*

Characteristic

Notes

Rating

Supply Voltage Output Voltage Range Input Voltage Output Current Operating Ambient Temperature Maximum Junction Temperature Storage Temperature

VDD VO VI IO TA TJ max Tstg

Range E
to 24 to VDD +
150 to 85
150 to 150
* Caution These CMOS devices have input static protection Class 2 but are still susceptible to damage if exposed to extremely high static electrical charges.

Units V mA ºC ºC ºC

Thermal Characteristics may require derating at maximum conditions, see application information

Characteristic

Test Conditions*

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Datasheet ID: A6277ELW 516049