A6277 Datasheet PDF - Allegro MicroSystems
| Part Number | A6277 | |
| Description | 8-BIT SERIAL-INPUT/ CONSTANTCURRENT LATCHED LED DRIVER | |
| Manufacturers | Allegro MicroSystems | |
| Logo |  |
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6277
8-BIT SERIAL-INPUT, CONSTANT-
CURRENT LATCHED LED DRIVER
A6277ELW
LOGIC
GROUND
SERIAL
DATA IN
1
2
CLOCK 3 CK
LATCH
ENABLE
HIGH/LOW
(CURRENT)
POWER
GROUND
4
5
6
OUT 0 7
L
SUB
OUT1 8
OUT 2 9
OUT3 10
VDD 20
IO
REGULATOR
19
18
FF 17
OE 16
REGISTER
LATCHES
15
SUB
14
LOGIC
SUPPLY
REXT
SERIAL
DATA OUT1
SERIAL
DATA OUT2
OUTPUT
ENABLE
POWER
GROUND
OUT 7
13 OUT6
12 OUT5
11 OUT4
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, VDD ...................... 7.0 V
Output Voltage Range,
VO ............................ -0.5 V to +24 V
Output Current, IO ....................... 150 mA
Input Voltage Range,
VI .................... -0.4 V to VDD + 0.4 V
Package Power Dissipation,
PD ..................................... See Graph
Operating Temperature Range, TA
Suffix ‘S-’ ................ -20°C to +85°C
Suffix ‘E-’ ................ -40°C to +85°C
Storage Temperature Range,
TS ........................... -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.
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’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. 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 ‘E–’ is for -40°C to +85°C, and
suffix ‘S–’ is -20°C to +85°C. Two package styles are provided for
through-hole DIP (suffix ‘–A’) or surface-mount SOIC (suffix ‘–LW’)
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°C).
FEATURES
s To 150 mA Constant-Current Outputs
s Under-Voltage Lockout
s Low-Power CMOS Logic and Latches
s High Data Input Rate
s Similar to Toshiba TD62715FN
s High/Low Output Current Function
Digital “Dim” Control
Always order by complete part number, e.g., A6277EA .
|
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6277
8-BIT SERIAL-INPUT,
CONSTANT-CURRENT
LATCHED LED DRIVER
SWITCHING CHARACTERISTICS at TA = 25°C, VDD = VIH = 5 V, VCE = 0.4 V, VIL = 0 V,
REXT = 470 Ω, IO = 40 mA, VL = 3 V, RL = 65 Ω, CL = 10.5 pF.
Characteristic
Propagation Delay Time
Propagation Delay Time
Output Fall Time
Output Rise Time
Symbol
tpHL
tpLH
tf
tr
Test Conditions
CLOCK-OUTn
LATCH-OUTn
ENABLE-OUTn
CLOCK-SERIAL DATA OUT1
CLOCK-OUTn
LATCH-OUTn
ENABLE-OUTn
CLOCK-SERIAL DATA OUT2
90% to 10% voltage
10% to 90% voltage
Min.
–
–
–
–
–
–
–
–
150
150
Limits
Typ. Max.
350 1000
350 1000
350 1000
40 –
300 1000
400 1000
380 1000
40 –
250 1000
250 600
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
RECOMMENDED OPERATING CONDITIONS
Characteristic
Supply Voltage
Output Voltage
Output Current
Logic Input Voltage
Clock Frequency
Symbol
VDD
VO
IO
IOH
IOL
VIH
VIL
fCK
Conditions
Continuous, any one output
SERIAL DATA OUT
SERIAL DATA OUT
Cascade operation
Min. Typ. Max.
4.5 5.0 5.5
– 1.0 4.0
– – 150
– – -1.0
– – 1.0
0.7VDD –
–
– – 0.3VDD
– – 10
Unit
V
V
mA
mA
mA
V
V
MHz
www.allegromicro.com
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| Information | Total 12 Pages | |
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| Download | [ A6277.PDF Datasheet ] | |
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