content.
DABIC-5 8-Channel Source Driver with Overcurrent Protection OUT1
IN4
IN5
IN6
IN7
IN8
FAULT
IN3
2987
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
IN2
IN1
4.75 to 35 V
1 to 8 Load
Components
CPU
GND
VS
OE/R ¯
Description
Providing overcurrent protection for each of its eight
sourcing outputs, the UDN2987A-6 and UDN2987LW-6
drivers are used as an interface between standard low-level
logic and relays, motors, solenoids, LEDs, and incandescent
lamps. These devices include thermal shut down and output
transient protection/clamp diodes for use with sustaining
voltages to 35 V.
In these drivers, each channel includes a latch to turn off that
channel if the maximum channel current is exceeded. All
channels are disabled if the thermal shutdown is activated. A
common FAULT output is used to indicate either chip thermal
shutdown or any overcurrent condition. All outputs are enabled
by pulling the common OE/R input high. When OE/R
¯ is low,
all outputs are inhibited and the eight latches are reset. The
OE/R
¯ function can be especially important during power-up,
in preventing floating inputs from turning on the outputs.
Under normal operating conditions, each of eight outputs
will source in excess of 100 mA continuously at an ambient
temperature of 25°C and a supply of 35 V. The overcurrent
29876-DS, Rev. 2
Features and Benefits
4.75 to 35 V driver supply voltage
Output enable-disable (OE/R)
350 mA output source current
Overcurrent
protected
Internal ground clamp diodes
Output Breakdown Voltage 35 V minimum
TTL, DTL, PMOS, or CMOS compatible inputs
Internal Thermal Shutdown (TSD)
DABIC-5 8-Channel Source Driver
with Overcurrent Protection
Continued on the next page
Packages:
Typical Application
Not to scale
UDN2987<i>x-6
20-pin DIP
(A package)
20-pin SOICW
(LW package) DABIC-5 8-Channel Source Driver
with Overcurrent Protection
UDN2987<i>x-6
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Parameter
Symbol
Notes
Rating
Units
Supply Voltage
V
S
35
V
Continuous Output Current*
I
OUT
Outputs are disabled at approximately 500 mA
500
mA
FAULT Output Voltage
V
CE
35
V
FAULT Output Current
I
C
30
mA
Input Voltage
V
IN
0.3 to 14
V
Junction Temperature
T
J
150
°C
Storage Temperature Range
T
S
Range N
55 to 150
°C
Operating Temperature Range
T
A
20 to 85
°C
*For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
Selection Guide
Absolute Maximum Ratings
Part Number
Packing
Package
UDN2987A-6-T
18 pieces/tube
20-pin DIP
UDN2987LW-6-T
37 pieces/tube
20-pin SOIC, wide body
UDN2987LWTR-6-T
1000 pieces/13-in. reel
fault circuit will protect the device from short-circuits to ground
with supply voltages of up to 30 V.
The inputs are compatible with 5 and 12 V logic systems: TTL,
Schottky TTL, DTL, PMOS, and CMOS. In all cases, the output
is switched ON by an active high input level. Compared to their
predecessor devices, the UDN2987A and UDN2987LW, the
UDN2987A-6 and UDN2987LW-6 have a significantly faster T
PHL

(200 ns typical) and a lower driver supply voltage rating (4.75 V),
which allows the use of 5 V logic.
The UDN2987A-6 is supplied in a 20-pin dual in-line plastic (DIP)
package; the UDN2987LW-6 is supplied in a 20-lead small-outline
(SOIC-W) plastic package. All packages are lead (Pb) free, with
100% matte-tin leadframe plating.
Description (continued) DABIC-5 8-Channel Source Driver
with Overcurrent Protection
UDN2987<i>x-6
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Block Diagram
Pin-Out Diagram
Terminal List Table
Number
Name
Description
1
IN1
Logic input 1
2
IN2
Logic input 2
3
IN3
Logic input 3
4
IN4
Logic input 4
5
IN5
Logic input 5
6
IN6
Logic input 6
7
IN7
Logic input 7
8
IN8
Logic input 8
9
FAULT
Fault output
10
OE/ ¯R¯ Logic input for Output Enable and Reset
11
VS
Supply voltage
12
GND
Supply ground
13
OUT8
Output 8 to load
14
OUT7
Output 7 to load
15
OUT6
Output 6 to load
16
OUT5
Output 5 to load
17
OUT4
Output 4 to load
18
OUT3
Output 3 to load
19
OUT2
Output 2 to load
20
OUT1
Output 1 to load
Dwg. PP-067
1
2
3
4
5
6
7
8
14
15
16
17
18
19
20
9
10
11
12
13
OE
N
OE
SENSE
N
FF
x8
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
FAULT
OE/R
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
GND
VS
Package A (DIP) shown. Package LW
(SOIC-W) is electrically identical and has
the same terminal number assignment.
IN1
GND
VS
<1
OUT1
IN8
OUT8
FAULT
Driver 1 of 8 drivers
OE/R ¯
+ Q
R
S
Thermal
Shut Down DABIC-5 8-Channel Source Driver
with Overcurrent Protection
UDN2987<i>x-6
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS
, valid at T
A
= 25°C, V
OER
= 2.4 V, V
S
= 35 V, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Typ.
1
Max.
Units
Supply Voltage Functional Range
V
S
4.75 35
V
Output Leakage Current
2
I
OUTCEX
V
IN
= 0.4 V, all inputs simultaneously
200
<5.0 A
Output Sustaining Voltage
V
OUT(sus)
I
OUT
= 350 mA, L = 2.0 mH
35
V
Output Saturation Voltage
V
OUT(SAT)
V
IN
= 2.4 V, I
OUT
= 100 mA 1.6
1.8
V
V
IN
= 2.4 V, I
OUT
= 225 mA 1.7
1.9
V
V
IN
= 2.4 V, I
OUT
= 350 mA 1.8
2.0
V
Channel Shut Down Threshold
2
I
M
V
IN
= 2.4 V, V
s
= 30 V 500
370
mA
FAULT Leakage Current
I
CEX
V
CC
= 35 V <1.0
100
A
FAULT Saturation Voltage
V
CE(SAT)
I
C
= 30 mA 0.3
0.8
V
Input Voltage
V
IN(ON)
2.4
V
V
IN(OFF)
0.4
V
Input Current: INx, OE/R
¯ pins
I
IN(ON)
V
IN
= 2.4 V
100
A
V
IN
= 5.0 V
600
A
V
IN
= 12 V
1000
A
I
IN(OFF)
V
IN
= 0.4 V
15
A
Clamp Diode Leakage Current
I
R
V
R
= 35 V, T
A
= 70°C
50
A
Clamp Diode Forward Voltage
V
F
I
F
= 350 mA 1.5
1.8
V
Supply Current
I
S(ON)
V
IN
= 2.4 V, all inputs simultaneously; outputs open 7.0
18
mA
I
S(OFF)
V
IN
= 0.4 V, all inputs simultaneously 6.0
12
mA
Thermal Shut Down
T
JTSD 165 °C
Thermal Hysteresis
T
JTSDhys 15 °C
Reset Pulse Duration
t
RPD
1.0
s
Propagation Delay Time
t
PLH
V
S
= 35 V, R
L
= 100 , C
LOAD
= 30 pF 100
600
ns
t
PHL
V
S
= 35 V, R
L
= 100 , C
LOAD
= 30 pF 200
1000
ns
Blank Time
t
BLANK 1.0 s
1
Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary for indi-
vidual units, within the specified maximum and minimum limits.
2
For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin. DABIC-5 8-Channel Source Driver
with Overcurrent Protection
UDN2987<i>x-6
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
THERMAL CHARACTERISTICS
Characteristics
Symbol
Test Conditions
Rating
Unit
Package Thermal Resistance
*
R
JA
Package A, on 4-layer board based on JEDEC standard
32
°C/W
Package LW, on 4-layer board based on JEDEC standard
48
°C/W
*
Additional thermal information is available on the Allegro Web site.
T
A
(°C)
P
D
(W)
0
0.5
1.5
2.0
2.5
3.0
3.5
4.0
1.0
25
50
75
100
125
150
Power Dissipation versus Ambient Temperature
(R
JA
= 48 ºC/W)
Package L
W
(R
JA
= 32 ºC/W)
Package A DABIC-5 8-Channel Source Driver
with Overcurrent Protection
UDN2987<i>x-6
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Characteristic Performance
Allowable Output Current as a Function of Duty Cycle
(UDN2987A-6 shown, multiply by 78% for UDN2987LW-6)
T
A
= 25°C, V
S
= 35 V
T
A
= 50°C, V
S
= 35 V
0
10
20
30
40
50
60
70
80
90
100
400
350
300
250
200
150
100
50
0
Duty Cycle (%)
Collector Current (mA)
8 7 6
5
4
3
Quantity of outputs conducting simultaneously
Output Current Waveshapes
0
10
20
30
40
50
60
70
80
90
100
400
350
300
250
200
150
100
50
0
Duty Cycle (%)
Collector Current (mA)
8 7 6
5
4
3
2
Quantity of outputs conducting simultaneously
V
IN(A)
= V
IN(B)
I
SH
I
OUT(A)
I
OUT(B)
I
M
t
BLANK
t
RTB
t
PLH
t
PHL
OE/R Output (A) shorted
Momentary fault or capacitive charging (<1s) DABIC-5 8-Channel Source Driver
with Overcurrent Protection
UDN2987<i>x-6
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Applications Information and Circuit Description
As with all power integrated circuits, the UDN2987A-6 and
UDN2987LW-6 have a maximum allowable output current
rating. The 500 mA rating does not imply that operation at
that value is permitted or even obtainable. The channel out-
put current trip point is specified as 370 mA, minimum;
therefore, attempted operation at current levels greater
than 370 mA may cause a fault indication and channel
shut down. The device is tested at a maximum of 350 mA
and that is the recommended maximum output current
per driver. It provides protection for current overloads or
shorted loads up to 30 V.
All outputs are enabled by pulling the OE/R
¯
input high.
When OE/R
¯
is low or allowed to float (internal pull-down),
all outputs are inhibited and the latches are reset. Note that
the reset pulse duration (OE/R
¯
low) should be at least 1 s.
This will ensure safe operation under attempted reset condi-
tions with a shorted load. The latches are also reset during