A6277ELW Allegro Microsystems Inc, A6277ELW Datasheet - Page 11

• Manufacturer Part Number: A6277ELW
• Description: IC LED DRIVER LINEAR 20-SOIC
• Manufacturer: Allegro Microsystems Inc
• Type: Linear (Non-Switching)r

Specifications of A6277ELW

• Constant Current: Yes
• Topology: 8-Bit Shift Register
• Number Of Outputs: 8
• Internal Driver: Yes
• Type - Primary: General Purpose
• Frequency: 20MHz
• Voltage - Supply: 4.5 V ~ 5.5 V
• Voltage - Output: 1V
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 120mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Efficiency: -

A6277
Terminal No.
7-14
15
16
17
18
19
20
1
2
3
4
5
6
POWER GROUND
POWER GROUND
SERIAL DATA IN
OUTPUT ENABLE
LOGIC GROUND
LATCH ENABLE
LOGIC SUPPLY
Terminal Name
SERIAL OUT
SERIAL OUT
(CURRENT)
HIGH/LOW
CLOCK
OUT
R
EXT
0-7
8-Bit Serial Input Constant-Current Latched LED Driver
2
1
(CURRENT)
HIGH/LOW
GROUND
GROUND
DATA IN
ENABLE
POWER
SERIAL
CLOCK
LATCH
LOGIC
OUT
OUT
OUT
OUT
Function
Serial-data input to the shift-register.
Ground.
Ground.
When (active) low, the output drivers are enabled; when high, all output
Reference terminal for control logic.
Clock input terminal for data shift on rising edge.
Data strobe input terminal; serial data is latched with high-level input.
Logic low for 100% of programmed current level;
logic high for 50% of programmed current level.
The eight current-sinking output terminals.
drivers are turned OFF (blanked).
CMOS serial-data output (on clock falling edge).
CMOS serial-data output (on clock rising edge)
to the following shift-registers.
An external resistor at this terminal establishes the output current for all sink
drivers.
(V
TERMINAL DESCRIPTION
0
1
2
3
DD
10
1
2
3
4
5
6
7
8
9
) The logic supply voltage.
Pin-out Diagram
CK
L
SUB
REGISTER
LATCHES
REGULATOR
I
O
FF
V
SUB
OE
DD
20
19
18
17
16
15
14
13
12
11
LOGIC
SUPPLY
R
SERIAL
DATA OUT
SERIAL
DATA OUT
OUTPUT
ENABLE
POWER
GROUND
OUT
OUT
OUT
OUT
EXT
Typically 5 V.
7
6
5
4
1
2
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
10