Allegro A6276SLWA, A6276SA, A6276ELW, A6276EA Datasheet

Data Sheet

26185.201

6276

16-BIT SERIAL-INPUT, CONSTANT­CURRENT LATCHED LED DRIVER

Always order by complete part number, e.g., A6276EA .

The A6276EA and A6276ELW are specifically designed for LED­display applications. Each BiCMOS device includes a 16-bit CMOS
shift register, accompanying data latches, and 16 npn constant-current
sink drivers. Except for package style and allowable package power
dissipation, the two devices are identical.

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’s 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. Similar 8-bit devices are available as the
A6275EA and A6275ELW.

Two package styles are provided for through-hole DIP (suffix A) or
surface-mount SOIC (suffix LW). Under normal applications, a copper
lead frame and low logic-power dissipation allow the dual in-line
package to sink maximum rated current through all outputs continu­ously over the operating temperature range (90 mA, 0.75 V drop,
+85°C). Both devices are also available for operation over the standard
temperature range of -20°C to +85°C. To order, change the suffix
letter ‘E’ to ‘S’.

Note that the A6276EA (DIP) and the A6276ELW
(SOIC) are electrically identical and share a
common terminal number assignment.

A6276ELW

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VDD...................... 7.0 V

Output Voltage Range,

V

O

............................ -0.5 V to +17 V

Output Current, I

O

........................ 90 mA

Ground Current, I

GND

............... 1475 mA

Input Voltage Range,

V

I

.................... -0.4 V to VDD + 0.4 V

Package Power Dissipation,

P

D

..................................... See Graph

Operating Temperature Range,

T

A

............................. -40°C to +85°C

Storage Temperature Range,

T

S

........................... -55°C to +150°C

Caution: These CMOS devices have input
static protection (Class 2) but are still suscep­tible to damage if exposed to extremely high
static electrical charges.

FEATURES

■ To 90 mA Constant-Current Outputs

■ Under-Voltage Lockout

■ Low-Power CMOS Logic and Latches

■ High Data Input Rate

■ Functional Replacement for TB62706BN/BF

GROUND

REGISTER

LATCHES

1

2

3

817

18

19

20

21

23

4

5

6

7

22

24

SERIAL
DATA OUT

LOGIC
SUPPLY

SERIAL

DATA IN

OUTPUT
ENABLE

LATCH

ENABLE

CLOCK CK

V

DD

OE

OUT

1

OUT

2

OUT

0

OUT

12

OUT

14

OUT

13

OUT

3

OUT

15

R

EXT

I

REGULATOR

L

O

12

9

10

11

OUT

5

OUT

6

OUT

4

OUT

7

13

14

15

16

Dwg. PP-029-11

OUT

8

OUT

10

OUT

9

OUT

11

6276

16-BIT SERIAL-INPUT,
CONSTANT-CURRENT
LATCHED LED DRIVER

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

2

Copyright © 2000, Allegro MicroSystems, Inc.

50 75 100 125 150

2.5

0.5

0

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

AMBIENT TEMPERATURE IN °C

2.0

1.5

1.0

25

Dwg. GP-022-3

24-LEAD SOIC, R

θJA

= 75°C/W

24-PIN DIP, R

θJA

= 50°C/W

FUNCTIONAL BLOCK DIAGRAM

MOS

BIPOLAR

GROUND

LATCH

ENABLE

OUTPUT ENABLE
(ACTIVE LOW)

SERIAL
DATA OUT

CLOCK

SERIAL

DATA IN

SERIAL-PARALLEL SHIFT REGISTER

LATCHES

V

DD

LOGIC
SUPPLY

R

EXT

OUT0OUT

1

Dwg. FP-013-3

OUT

2

OUT

N

I

REGULATOR

O

UVLO

6276

16-BIT SERIAL-INPUT,

CONSTANT-CURRENT

LATCHED LED DRIVER

www.allegromicro.com

3

CLOCK and SERIAL DATA IN SERIAL DATA OUT

LATCH ENABLEOUTPUT ENABLE (active low)

Dwg. EP-010-6

IN

V

DD

Dwg. EP-010-7

IN

V

DD

Dwg. EP-010-5

IN

V

DD

Dwg. EP-063-1

V

DD

OUT

TRUTH TABLE

Serial Shift Register Contents Serial Latch Latch Contents Output Output Contents
Data Clock Data Enable Enable
Input Input I

1I2I3

... I

N-1IN

Output Input I1I2I3... I

N-1IN

Input I1I2I3... I

N-1

I

N

HHR

1R2

... R

N-2RN-1

R

N-1

LLR

1R2

... R

N-2RN-1

R

N-1

XR

1R2R3

... R

N-1RN

R

N

XXX...X X X L R1R2R3... R

N-1 RN

P1P2P3... P

N-1PN

P

N

HP1P2P3... P

N-1 PN

LP1P2P3... P

N-1 PN

XXX...X X H H H H ... H H

L = Low Logic (Voltage) Level H = High Logic (Voltage) Level X = Irrelevant P = Present State R = Previous State

6276

16-BIT SERIAL-INPUT,
CONSTANT-CURRENT
LATCHED LED DRIVER

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

4

ELECTRICAL CHARACTERISTICS at TA = +25°C, VDD = 5 V (unless otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Unit

Supply Voltage Range V

DD

Operating 4.5 5.0 5.5 V

Under-Voltage Lockout V

DD(UV)

VDD = 0 → 5 V 3.4 – 4.0 V

Output Current I

O

VCE = 0.7 V, R

EXT

= 250 Ω 64.2 75.5 86.8 mA

(any single output)

VCE = 0.7 V, R

EXT

= 470 Ω 34.1 40.0 45.9 mA

Output Current Matching ∆I

O

0.4 V ≤ V

CE(A)

= V

CE(B)

≤ 0.7 V:

(difference between any R

EXT

= 250 Ω – ±1.5 ±6.0 %

two outputs at same VCE)

R

EXT

= 470 Ω – ±1.5 ±6.0 %

Output Leakage Current I

CEX

VOH = 15 V – 1.0 5.0 µA

Logic Input Voltage V

IH

0.7V

DD

–VDDV

V

IL

GND – 0.3V

DD

V

SERIAL DATA OUT V

OL

IOL = 500 µA––0.4V

Voltage

V

OH

IOH = -500 µA4.6––V

Input Resistance R

I

ENABLE Input, Pull Up 150 300 600 kΩ

LATCH Input, Pull Down 100 200 400 kΩ

Supply Current I

DD(OFF)

R

EXT

= open, VOE = 5 V – 0.8 1.4 mA

R

EXT

= 470 Ω, VOE = 5 V 3.5 6.0 8.0 mA

R

EXT

= 250 Ω, VOE = 5 V 6.5 11 15 mA

I

DD(ON)

R

EXT

= 470 Ω, VOE = 0 V 7.0 13 20 mA

R

EXT

= 250 Ω, VOE = 0 V 10 22 32 mA

Typical Data is at VDD = 5 V and is for design information only.