A6278EA-T Allegro Microsystems Inc, A6278EA-T Datasheet - Page 5

• Manufacturer Part Number: A6278EA-T
• Description: IC,Laser Diode/LED Driver,BICMOS,DIP,16PIN,PLASTIC
• Manufacturer: Allegro Microsystems Inc
• Type: Linear (Non-Switching)r

Specifications of A6278EA-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: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• 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: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 620-1165-5; A6278EA-T

A6278
A6279
L = Low logic (voltage) level
H = High logic (voltage) level
X = Don’t care
P = Present state
R = Previous state
n = 7 for the A6278, n = 15 for the A6279
Serial
Input
Data
IN
H
X
L
OUTPUT ENABLE
(active low)
Clock
Input
and
I
H R
L R
R
X
P
0
0
0
Shift Register Contents
R
P
X X
I
0
1
0
1
1
R
R
P
R
I
1
1
2
2
2
…
…
…
V
…
…
…
DD
R
R
X
P
R
I
n-2
n-1
n-1
n-1
n-2
Inputs and Outputs Equivalent Circuits
R
X
R
P
R
I
n-1
n
n
n
n-1
IN
SERIAL DATA IN
CLOCK and
Serial
Data
R
R
Out
R
P
X
n-1
n-1
n
n
Serial-Input, Constant-Current Latched
LED Drivers with Open LED Detection
Truth Table
Enable
Latch
Input
H
L
V
DD
I
R
P
X
0
0
0
P
R
X X
I
1
1
1
Latch Contents
P
IN
LE
R
I
2
2
2
…
…
…
LATCH ENABLE
…
X
R
P
I
n-1
n-1
n-1
X
R
P
I
n
n
n
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Enable
Output
Input
H
L
V
V
DD
DD
I
P
H
0
0
SERIAL DATA OUT
P
Output Contents
I
H H
1
1
P
I
2
2
…
…
…
V
DD
P
H
I
n-1
n-1
OUT
P
H
I
n
n
5