A6278ELP-T Allegro Microsystems Inc, A6278ELP-T Datasheet - Page 6

• Manufacturer Part Number: A6278ELP-T
• Description: IC LED DRIVER LINEAR 16-TSSOP
• Manufacturer: Allegro Microsystems Inc
• Type: Linear (Non-Switching)r

Specifications of A6278ELP-T

• Constant Current: Yes
• Topology: 8-Bit Shift Register
• Number Of Outputs: 8
• Internal Driver: Yes
• Type - Primary: General Purpose
• Frequency: 25MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 75.5mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Efficiency: -

A6278
A6279
Logic Levels: V
Logic Levels: V
A6278, n = 7
A6279, n = 15
DD
DD
and
and GND
and GND
LED Open Circuit Detection (Test) Mode Timing Requirements
(A) To enter LED OCD mode, a minimum of one CLOCK pulse is required after LATCH ENABLE is brought back low.
(C) When returning to Normal mode, a minimum of three CLOCK pulses is required after OUTPUT ENABLE is brought back high.
(B) To output the latched error code, OUTPUT ENABLE must be held low a minimum of 3 CLOCK cycles.
DATA OUT
DATA OUT
OUTPUT
OUTPUT
ENABLE
ENABLE
ENABLE
ENABLE
OUTPUT
ENABLE
CLOCK
CLOCK
OUTPUT
LATCH
LATCH
DATA IN
ENABLE
ENABLE
CLOCK
SERIAL
SERIAL
SERIAL
CLOCK
LATCH
OUT0
OUT1
OUTn
t
t
SU(OE1)
SU(OE1)
t
SU(D)
SDI n
t
t
high
high
Normal Mode Timing Requirements
t
t
high
H(D)
0
t
t
low
1
low
t
SDI n-1
low
1
Don't Care
Don't Care
Don't Care
Don't Care
Don't Care
t
W(OE1)
t
H(OE1)
t
H(OE1)
t
SU(LE1)
Serial-Input, Constant-Current Latched
1
LED Drivers with Open LED Detection
2
2
t
H(LE1)
3
SDI 0
t
t
SU(LE)
p(DO)
SDO n
1
3
n
t
H(LE)
SDO n
SDO n-1
t
SU(OE)
A6278, n = 7
A6279, n = 15
t
P(OE)
SDO n-2
t
D(Total)
t
D
t
W(OE)
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
SDO 0
t
P(OE)
t
D(Total)
t
D
t
W(OE)
6