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Электронный компонент: 6275

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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 +85C. 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
8
9
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
I To 90 mA Constant-Current Outputs
I Under-Voltage Lockout
I Low-Power CMOS Logic and Latches
I High Data Input Rate
I 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
JA
SUFFIX 'LW', R = 80
C/W
JA
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 ENABLE
OUTPUT 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
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
H
H
R
1
R
2
...
R
N-2
R
N-1
R
N-1
L
L
R
1
R
2
...
R
N-2
R
N-1
R
N-1
X
R
1
R
2
R
3
...
R
N-1
R
N
R
N
X
X
X
...
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
H
P
1
P
2
P
3
...
P
N-1
P
N
L
P
1
P
2
P
3
... P
N-1
P
N
X
X
X
...
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
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6275
8-BIT SERIAL-INPUT,
CONSTANT-CURRENT
LATCHED LED DRIVER
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
4
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
5.0
10
14
mA
R
EXT
= 250
, V
OE
= 0 V
8.0
16
24
mA
Typical Data is at V
DD
= 5 V and is for design information only.
6275
8-BIT SERIAL-INPUT,
CONSTANT-CURRENT
LATCHED LED DRIVER
www.allegromicro.com
5
RECOMMENDED OPERATING CONDITIONS
Characteristic
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply Voltage
V
DD
4.5
5.0
5.5
V
Output Voltage
V
O
-
1.0
4.0
V
Output Current
I
O
Continuous, any one output
-
-
90
mA
I
OH
SERIAL DATA OUT
-
-
-1.0
mA
I
OL
SERIAL DATA OUT
-
-
1.0
mA
Logic Input Voltage
V
IH
0.7V
DD
-
V
DD
+ 0.3
V
V
IL
-0.3
-
0.3V
DD
V
Clock Frequency
f
CK
Cascade operation
-
-
10
MHz
SWITCHING CHARACTERISTICS at T
A
= 25
C, V
DD
= V
IH
= 5 V, V
CE
= 0.4 V, V
IL
= 0 V,
R
EXT
= 470
, I
O
= 40 mA, V
L
= 3 V, R
L
= 65
, C
L
= 10.5 pF.
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Propagation Delay Time
t
pHL
CLOCK-OUT
n
350
1000
ns
LATCH-OUT
n
350
1000
ns
ENABLE-OUT
n
350
1000
ns
CLOCK-SERIAL DATA OUT
80
110
ns
Propagation Delay Time
t
pLH
CLOCK-OUT
n
300
1000
ns
LATCH-OUT
n
300
1000
ns
ENABLE-OUT
n
300
1000
ns
CLOCK-SERIAL DATA OUT
80
110
ns
Output Fall Time
t
f
90% to 10% voltage
150
350
1000
ns
Output Rise Time
t
r
10% to 90% voltage
150
300
600
ns