6277
PRELIMINARY INFORMATION
(Subject to change without notice)
July 20, 2000
Data Sheet
26185.202
8-BIT SERIAL-INPUT, CONSTANT-
CURRENT LATCHED LED DRIVER
The A6277x is specifically designed for LED-display applications.
Each BiCMOS device includes an 8-bit CMOS shift register, accompa-
nying data latches, and eight npn constant-current sink drivers. Two
package styles and two operating temperature ranges are available.
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. In addition, a HIGH/LOW function
enables full selected current with the application of a logic low, or 50%
selected current with the application of a logic high.
The first character of the part number suffix determines the device
operating temperature range. Suffix 鈥楨鈥撯€?is for -40擄C to +85擄C, and
suffix 鈥楽鈥撯€?is -20擄C to +85擄C. Two package styles are provided for
through-hole DIP (suffix 鈥樷€揂鈥? or surface-mount SOIC (suffix 鈥樷€揕W鈥?
applications. The copper lead frame and low logic-power dissipation
allow the dual in-line package to sink 122 mA through all outputs
continuously over the operating temperature range (1.0 V drop,
+85擄C).
A6277ELW
LOGIC
GROUND
SERIAL
DATA IN
CLOCK
LATCH
ENABLE
HIGH/LOW
(CURRENT)
POWER
GROUND
OUT
0
OUT
1
OUT
2
OUT
3
1
2
3
4
5
6
SUB
V
DD
I
O
REGULATOR
CK
L
FF
OE
20
19
18
17
16
15
LOGIC
SUPPLY
R
EXT
SERIAL
DATA OUT
1
SERIAL
DATA OUT
2
OUTPUT
ENABLE
POWER
GROUND
OUT
7
OUT
6
OUT
5
OUT
4
REGISTER
LATCHES
SUB
7
8
9
10
14
13
12
11
Dwg. PP-029-17A
Note that the A6277EA (DIP) and the A6277ELW
(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 +24 V
Output Current, I
O
.......................
150 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
Suffix 鈥楽-鈥?................
-20
擄
C to +85
擄
C
Suffix 鈥楨-鈥?................
-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
To 150 mA Constant-Current Outputs
I
24 V Outputs
I
Under-Voltage Lockout
I
Low-Power CMOS Logic and Latches
I
High Data Input Rate
I
Similar to Toshiba TD62715FN
I
High/Low Output Current Function
Always order by complete part number, e.g.,
A6277EA
.
1
2
3
4
5
6
7
8
9
10
11
12
