Data Sheet
26185.201B
6276
16-BIT SERIAL-INPUT, CONSTANT-
CURRENT LATCHED LED DRIVER
Always order by complete part number, e.g., A6276EA .
The A6276EA and A6276ELW are 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 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 deter-
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.
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 continu-
ously 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, V
DD
...................... 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 V
DD
+ 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 suscep-
tible to damage if exposed to extremely high
static electrical charges.
FEATURES
s To 90 mA Constant-Current Outputs
s Under-Voltage Lockout
s Low-Power CMOS Logic and Latches
s High Data Input Rate
s Functional Replacement for TB62706BN/BF
GROUND
REGISTER
LATCHES
1
2
3
8
17
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 (508) 853-5000
2
Copyright 2000, 2003 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
JA
= 75
C/W
24-PIN DIP, R
JA
= 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
OUT
0
OUT
1
Dwg. FP-013-3
OUT
2
OUT
N
I
REGULATOR
O
UVLO
6276
16-BIT SERIAL-INPUT,
CONSTANT-CURRENT
LATCHED LED DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
ELECTRICAL CHARACTERISTICS at T
A
= +25
C, V
DD
= 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)
V
DD
= 0 5 V
3.4
4.0
V
Output Current
I
O
V
CE
= 0.7 V, R
EXT
= 250
64.2
75.5
86.8
mA
(any single output)
V
CE
= 0.7 V, R
EXT
= 470
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
1.5
6.0
%
two outputs at same V
CE
)
R
EXT
= 470
1.5
6.0
%
Output Leakage Current
I
CEX
V
OH
= 15 V
1.0
5.0
A
Logic Input Voltage
V
IH
0.7V
DD
V
DD
V
V
IL
GND
0.3V
DD
V
SERIAL DATA OUT
V
OL
I
OL
= 500
A
0.4
V
Voltage
V
OH
I
OH
= -500
A
4.6
V
Input Resistance
R
I
ENABLE Input, Pull Up
150
300
600
k
LATCH Input, Pull Down
100
200
400
k
Supply Current
I
DD(OFF)
R
EXT
= open, V
OE
= 5 V
0.8
1.4
mA
R
EXT
= 470
, V
OE
= 5 V
3.5
6.0
8.0
mA
R
EXT
= 250
, V
OE
= 5 V
6.5
11
15
mA
I
DD(ON)
R
EXT
= 470
, V
OE
= 0 V
7.0
13
20
mA
R
EXT
= 250
, V
OE
= 0 V
10
22
32
mA
Typical Data is at V
DD
= 5 V and is for design information only.
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