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A6275 Datasheet

  • A6275

  • 8-BIT SERIAL-INPUT, CONSTANTCURRENT LATCHED LED DRIVER

  • 12頁

  • ALLEGRO   ALLEGRO

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6275
8-BIT SERIAL-INPUT, CONSTANT-
CURRENT LATCHED LED DRIVER
A6275ELW
GROUND
SERIAL
DATA IN
CLOCK
LATCH
ENABLE
OUT
0
OUT
1
OUT
2
OUT
3
1
2
3
4
5
6
7
8
CK
L
REGISTER
LATCHES
12
11
10
9
OE
V
DD
I
O
REGULATOR
16
15
14
13
LOGIC
SUPPLY
R
EXT
SERIAL
DATA OUT
OUTPUT
ENABLE
OUT
7
OUT
6
OUT
5
OUT
4
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鈥檚 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擄C). Both
devices are also available for operation over the standard temperature
range of -20擄C to +85擄C. To order, change the suffix letter 鈥楨鈥?to 鈥楽鈥?
Data Sheet
26185.200
Dwg. PP-029-10
Note that the A6275EA (DIP) and the A6275ELW
(SOIC) are electrically identical and share a
common terminal number assignment.
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
擄
C to +85
擄
C
Storage Temperature Range,
T
S
...........................
-55
擄
C to +150
擄
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
I
I
I
I
I
To 90 mA Constant-Current Outputs
Under-Voltage Lockout
Low-Power CMOS Logic and Latches
High Data Input Rate
Pin-Compatible with TB62705CP
Always order by complete part number, e.g.,
A6275EA
.

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