Allegro Microsystems A6275EA

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Technical Document


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A6275ELW
Data Sheet
26185.200
8-BIT SERIAL-INPUT, CONSTANT-
CURRENT LATCHED LED DRIVER
Always order by complete part number, e.g., A6275EA .
The A6275EA and A6275ELW are 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. 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 16-bit devices are available as
the A6276EA and A6276ELW.
Two package styles are provided for through-hole DIP (suffix A) or
surface-mount SOIC (suffix LW). Under normal applications, copper
lead frames and low logic-power dissipation allow these devices to
sink maximum rated current through all outputs continuously over the
operating temperature range (90 mA, 0.9 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’.
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
................. 750 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.
GROUND
REGISTER
LATCHES
1
2
3
89
10
11
12
13
15
4
5
6
7
14
16
SERIAL
DATA OUT
LOGIC
SUPPLY
SERIAL
DATA IN
OUTPUT
ENABLE
LATCH
ENABLE
CLOCK CK
V
DD
OE
OUT
1
OUT
2
Dwg. PP-029-10
OUT
0
OUT
4
OUT
6
OUT
5
OUT
3
OUT
7
R
EXT
I
REGULATOR
L
O
Note that the A6275EA (DIP) and the A6275ELW
(SOIC) are electrically identical and share a
common terminal number assignment.
6275
FEATURES
To 90 mA Constant-Current Outputs
Under-Voltage Lockout
Low-Power CMOS Logic and Latches
High Data Input Rate
Pin-Compatible with TB62705CP
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6275
8-BIT SERIAL-INPUT,
CONSTANT-CURRENT
LATCHED LED DRIVER
2
Copyright © 2000, Allegro MicroSystems, Inc.
50 75 100 125 150
2.5
0.5
0
AMBIENT TEMPERATURE IN °C
2.0
1.5
1.0
25
Dwg. GP-018B
SUFFIX 'A', R = 60°C/W
θJA
SUFFIX 'LW', R = 80°C/W
θJA
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
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
6275
8-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
Dw
g
. 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
1
I
2
I
3
... I
N-1
I
N
Output Input I
1
I
2
I
3
... I
N-1
I
N
Input I
1
I
2
I
3
... I
N-1
I
N
HHR
1
R
2
... R
N-2
R
N-1
R
N-1
LLR
1
R
2
... R
N-2
R
N-1
R
N-1
XR
1
R
2
R
3
... R
N-1
R
N
R
N
XXX...X X X L R
1
R
2
R
3
... R
N-1
R
N
P
1
P
2
P
3
... P
N-1
P
N
P
N
HP
1
P
2
P
3
... P
N-1
P
N
LP
1
P
2
P
3
... P
N-1
P
N
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
1234NEXT

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