ALLEGRO 6276 DATA SHEET

6276

16-BIT SERIAL-INPUT, CONSTANT­CURRENT LATCHED LED DRIV ER

26185.201E

Data Sheet

A6276ELW

GROUND

SERIAL

DATA IN

ENABLE

1

2

CLOCK CK

3

LATCH

4

OUT

5

0

OUT

6

1

OUT

7

2

8 17

OUT

3

9

OUT

4

OUT

10

5

OUT

11

6

12

OUT

7

REGULATOR

L

REGISTER

LATCHE S

V

I

O

Note that three packages offered are electrically
identical and share a common terminal number as­signment.

LOGIC

24

DD

SUPPLY

R

23

EXT

SERIAL

22

DATA OUT

OUTPUT

21

OE

ENABLE

20

OUT

15

OUT

19

14

18

OUT

13

OUT

12

OUT

16

11

OUT

15

10

OUT

14

9

13

OUT

8

Dwg. PP-029-1 1

ABSOLUTE MAXI MUM RATINGS

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

Output Voltage Range,

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

V

O

Output Current, I
Ground Current, I
Input Voltage Range,

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

V

I

Package Power Dissipation,

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

P

D

Operating T emperature Range,

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

T

A

Storage T emperature Range,

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

T

S

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

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

O

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

GND

The A6276 is specifically designed for LED-display 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 device
options 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 de ter ­mined 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.

Three package styles are provided: through-hole DIP (suffix A),
surface-mount SOIC (suffix LW) and TSSOP with exposed thermal pad
(suffix LP). 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 con tin u ous ly over the operating
temperature range (90 mA, 0.75 V drop, +85°C).

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

Selection Guide

Part Number Pb-free* Package Packing

A6276EA-T Yes 24-pin DIP 15 per tube –40 to 85
A6276ELP-T Yes 24-pin TSSOP 62 per tube –40 to 85
A6276ELPTR-T Yes 24-pin TSSOP 4000 per reel –40 to 85
A6276ELW-T Yes 24-pin SOICW 31 per tube –40 to 85
A6276ELWTR-T Yes 24-pin SOICW 1000 per reel –40 to 85
A6276SLW-T Yes 24-pin SOICW 31 per tube –20 to 85

A6276SLWTR-T Yes 24-pin SOICW 1000 per reel –20 to 85
*Pb-based variants are being phased out of the product line. The variants cited in this
footnote are in production but have been determined to be NOT FOR NEW DESIGN.
This classification indicates that sale of this device is currently restricted to existing
customer applications. The variants should not be purchased for new design applica­tions because obsolescence in the near future is probable. Samples are no longer
available. Status change: May 1, 2006. These variants include:A6276EA, A6276ELW,
A6276ELWTR, A6276SA, A6276SLW, and A6276SLWTR.

Ambient

Temperature (°C)

6276

16-BIT SERIAL-INPUT,
CONSTANT-CURRENT
LATCHED LED DRIV ER

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

0

25

*Mounted on single-layer, two-sided PCB, with 3.8 in2copper each side;

additional information on Allegro Web site

50 75 100 125 150
AMBIENT TEMPERATURE IN °°°°C

24-PIN TSSOP*, R

24-PIN DIP, R

θJA

24-LEAD SOIC, R

θJA

=32°C/W

=50°C/W

θJA

= 85°C/W

FUNCTIONAL BLOCK DI A GRAM

CLOCK

SERIAL

DATA IN

LATCH

ENABLE

GROUND

2

OUT0OUT

SERIAL-PARALLEL SHIFT REGISTER

LATCHES

OUT

1

2

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
Copyright © 2000, 2003 Allegro MicroSystems, Inc.

OUT

N

UVLO

BIPOLAR

I

O

REGULATOR

V

DD

MOS

LOGIC
SUPPLY

SERIAL
DATA OUT

OUTPUT ENABLE
(ACTIVE LOW)

R

EXT

Dwg. FP-013-3

6276

DD

16-BIT SERIAL-INPUT,

CONSTANT-CURRENT

LATCHED LED DRIVER

V

DD

V

DD

IN

Dwg. EP-010-11

IN

Dwg. EP-010-12

LATCH ENABLEOUTPUT ENABLE (active low)

V

DD

IN

Dwg. EP-063-6

Dwg. EP-010-13

V

OUT

CLOCK and SERIAL DATA IN SERIAL DATA OUT

TRUTH TABLE

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

1I2I3

HHR

LLR

XR

1R2R3

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

P1P2P3... P

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

www.allegromicro.com

1R2

1R2

... I

... R

... R

... R

N-1IN

N-2RN-1

N-2RN-1

N-1RN

N-1PN

Output Input I1I2I3... I

R

N-1

R

N-1

R

N

P

N

HP1P2P3... P

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

N-1IN

N-1 RN

N-1 PN

Input I1I2I3... I

LP1P2P3... P

I

N-1

N-1 PN

N

3

6276

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

ELECTRICAL CHARACTERISTICS at T

= +25°C, V

A

= 5 V (unless otherwise noted).

DD

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Unit

Supply Voltage Range V

Under-Voltage Lockout V

Output Current I

DD

DD(UV)

O

(any single output)

Output Current Matching ∆I

O

(difference between any R
two outputs at same VCE)

Output Leakage Current I

Logic Input Voltage V

SERIAL DATA OUT V
Voltage

CEX

V

V

IH

IL

OL

OH

Operating 4.5 5.0 5.5 V

V

= 0 → 5 V 3.4 – 4.0 V

DD

VCE = 0.7 V, R

VCE = 0.7 V, R

0.4 V ≤ V

V

OH

I

OL

I

OH

CE(A)

EXT

R

EXT

= 15 V – 1.0 5.0 µA

= 500 µA – – 0.4 V

= -500 µA 4.6 – – V

= 250 Ω 64.2 75.5 86.8 mA

EXT

= 470 Ω 34.1 40.0 45.9 mA

EXT

= V

CE(B)

≤ 0.7 V:
= 250 Ω – ±1.5 ±6.0 %
= 470 Ω – ±1.5 ±6.0 %

0.7V

GND – 0.3V

–VDDV

DD

DD

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)

I

DD(ON)

R

= open, VOE = 5 V – 0.8 1.4 mA

EXT

R

= 470 Ω, V

EXT

R

= 250 Ω, V

EXT

R

= 470 Ω, V

EXT

R

= 250 Ω, V

EXT

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

4

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

= 5 V 3.5 6.0 8.0 mA

OE

= 5 V 6.5 11 15 mA

OE

= 0 V 7.0 13 20 mA

OE

= 0 V 10 22 32 mA

OE

6276

16-BIT SERIAL-INPUT,

CONSTANT-CURRENT

LATCHED LED DRIVER

SWITCHING CHARACTERISTICS at T
R

EXT

= 470 Ω, I

= 40 mA, VL = 3 V, R

O

= 25°C, V

A

= 65 Ω, C

L

= VIH = 5 V, VCE = 0.4 V, VIL = 0 V,

DD

= 10.5 pF.

L

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Unit

Propagation Delay Time t

pHL

CLOCK-OUT

LATCH-OUT

ENABLE-OUT

n

n

n

– 350 1000 ns

– 350 1000 ns

– 350 1000 ns

CLOCK-SERIAL DATA OUT – 40 – ns

Propagation Delay Time t

pLH

CLOCK-OUT

LATCH-OUT

ENABLE-OUT

n

n

n

– 300 1000 ns

– 300 1000 ns

– 300 1000 ns

CLOCK-SERIAL DATA OUT – 40 – ns

Output Fall Time t

Output Rise Time t

f

r

90% to 10% voltage 150 350 1000 ns

10% to 90% voltage 150 300 600 ns

RECOMMENDED OPERATING CONDITIONS

Characteristic Symbol Conditions Min. Typ. Max. Unit

Supply Voltage V

Output Voltage V

Output Current I

Logic Input Voltage V

Clock Frequency f

www.allegromicro.com

DD

O

O

I

OH

I

OL

IH

V

IL

CK

Continuous, any one output – – 90 mA

SERIAL DATA OUT – – -1.0 mA

SERIAL DATA OUT – – 1.0 mA

Cascade operation – – 10 MHz

4.5 5.0 5.5 V

– 1.0 4.0 V

0.7V

-0.3 – 0.3V

–VDD + 0.3 V

DD

DD

V

5