a6279eet-t Allegro MicroSystems, Inc., a6279eet-t Datasheet - Page 4

• Manufacturer Part Number: a6279eet-t
• Description: Serial-input Constant-current Latched Led Drivers With Open Led Detection
• Manufacturer: Allegro MicroSystems, Inc.

A6278
A6279
OPERATING CHARACTERISTICS
ELECTRICAL CHARACTERISTICS valid at T
LOGIC SUPPLY Voltage Range
Undervoltage Lockout
Output Current (any single output)
Output Current Matching (difference between any two
outputs at the same V
Output Leakage Current
Logic Input Voltage
Logic Input Voltage Hysteresis
SERIAL DATA OUT Voltage
Input Resistance
LOGIC SUPPLY Current
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Open LED Detection Threshold
SWITCHING CHARACTERISTICS valid at T
58 Ω, C
CLOCK Pulse Width
SERIAL DATA IN Setup Time
SERIAL DATA IN Hold Time
LATCH ENABLE Setup Time
LATCH ENABLE Hold Time
OUTPUT ENABLE Set Up Time
OUTPUT ENABLE Hold Time
OUTPUT ENABLE Pulse Width
CLOCK to SERIAL DATA OUT Propagation Delay Time
OUTPUT ENABLE to OUT0 Propagation Delay Time
Staggering Delay (between consecutive outputs)
Total Delay Time (15 × t
CLOCK Pulse Width
SERIAL DATA IN Setup Time
SERIAL DATA IN Hold Time
LATCH ENABLE Setup Time
LATCH ENABLE Hold Time
OUTPUT ENABLE Set Up Time
OUTPUT ENABLE Hold Time
OUTPUT ENABLE Pulse Width*
CLOCK to SERIAL DATA OUT Propagation Delay Time
OUTPUT ENABLE to OUT0 Propagation Delay Time
Staggering Delay (between consecutive outputs)
Total Delay Time (15 × t
Output Fall Time
Output Rise Time
*See LED Open Circuit Detection (Test) mode timing diagram.
LED
= 10 pF, unless otherwise noted
and
Characteristic
CE
D
D
)
)
)
A
A
= 25
= 25
°
C, V
°
C, V
DD
DD
= V
V
Symbol
T
t
t
I
V
Serial-Input, Constant-Current Latched
= 3.0 to 5.5 V, unless otherwise noted
I
high,
t
high,
t
DD(OFF)
t
t
t
t
DD(ON)
T
JTSDhys
CE(ODC)
t
t
t
t
t
SU(OE)
t
t
SU(OE)
t
SU(LE)
t
t
SU(LE)
t
t
LED Drivers with Open LED Detection
DD(UV)
V
W(OE)
W(OE)
I
SU(D)
t
H(OE)
P(DO)
P(OE)
SU(D)
t
H(OE)
P(DO)
P(OE)
V
V
H(LE)
Dtotal
H(LE)
Dtotal
ΔI
V
V
CEX
V
JTSD
H(D)
H(D)
IH
R
I
t
t
Ihys
OH
t
t
DD
O
OL
D
D
IH
IL
f
r
O
I
t
t
= 3.0 to 5.5 V, V
low
low
Operating
V
V
V
V
V
V
V
V
V
All digital inputs
I
I
OUTPUT ENABLE input, Pull Up
LATCH ENABLE input, Pull Down
R
R
R
R
R
R
Temperature increasing
I
Normal Mode
Test Mode, V
90% to 10% voltage
10% to 90% voltage
OL
OH
O
DD
DD
CE
CE
CE
CE(A)
CE(A)
CE(A)
OH
EXT
EXT
EXT
EXT
EXT
EXT
> 5 mA, V
= 500 μA
= –500 μA
= 0.7 V, R
= 0.7 V, R
= 0.6 V, R
= 0.0 → 5.0 V
= 5.0 → 0.0 V
= 15 V
= open, V
= 470 Ω, V
= 225 Ω, V
= 3900 Ω, V
= 470 Ω, V
= 225 Ω, V
= V
= V
= V
CE(B)
CE(B)
CE(B)
CE
Test Conditions
CE
DD
= 0.7 V, V
EXT
EXT
EXT
= 0.7 V, R
= 0.7 V, R
= 0.6 V, R
OE
≥ 0.6 V
OE
OE
OE
OE
= 4.5 to 5.5 V
OE
= 225 Ω
= 470 Ω
= 3900 Ω
= 5 V
= 5 V
= 5 V
= 0 V
= 0 V
= 0 V
IL
EXT
EXT
EXT
= 0 V, R
= 225 Ω
= 470 Ω
= 3900 Ω
EXT
115 Northeast Cutoff, Box 15036
= 470 Ω, I
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
V
0.7V
DD
GND
Min.
2.15
64.2
34.1
4.25
200
150
100
600
3.0
2.4
2.0
20
10
10
20
20
40
20
30
10
20
20
20
40
20
40
20
30
10
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
– 0.4
DD
O
= 40 mA, V
Typ.
75.5
40.0
+1.0
+1.0
+1.0
0.30
300
200
165
300
300
5.0
5.0
1.0
15
75
20
75
20
75
75
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
0.3V
LED
Max
2.85
2.55
86.8
45.9
5.75
+6.0
+6.0
+6.0
18.0
32.0
V
400
600
400
150
150
5.5
5.0
0.4
1.4
5.0
8.0
3.0
40
40
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
DD
= 3 V, R
DD
Unit
LED
mA
mA
mA
mV
mA
mA
mA
mA
mA
mA
μA
kΩ
kΩ
°C
°C
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
us
ns
ns
ns
ns
ns
ns
%
%
%
V
V
V
V
V
V
V
V
=
4