Allegro UDN2987LW, UDN2987A Datasheet
2987
8-CHANNEL
SOURCE DRIVER
8-CHANNEL SOURCE DRIVER
WITH OVER-CURRENT PROTECTION
Providing over-current protection for each of its eight sourcing
outputs, the UDN2987A and UDN2987LW drivers are used as an
interface between standard low-level logic and relays, motors, solenoids, LEDs, and incandescent lamps. The device includes thermal
shutdown 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.
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 over-current fault circuit will protect
the device from short-circuits to ground with supply voltages of up to
35 V.
The inputs are compatible with 5 V 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. The UDN2987A is supplied
in a 20-pin dual in-line plastic package; the UDN2987LW is supplied in
a 20-lead small-outline plastic package.
FEATURES
■ 350 mA Output Source Current
■ Over-Current Protected
■ Internal Ground Clamp Diodes
■ Output Breakdown Voltage 35 V, Minimum
■ TTL, DTL, PMOS, or CMOS Compatible Inputs
■ Internal Thermal Shutdown
■ Automotive Capable
Data Sheet
29310.4A
Always order by complete part number:
Part Number Package
UDN2987A 20-Pin DIP
UDN2987LW 20-Lead Wide-Body SOIC
Note that the UDN2987A (DIP) and the UDN2987LW
(SOIC) are electrically identical and share a common
terminal number assignment.
Dwg. PP-067
V
S
1
2
3
4
5
6
7
8
14
15
16
17
18
19
20
9
10
11
12
13
GROUND
OUT
IN
FAULT
OE/R
1
OEN
OE
SENSEN
FF
x8
OUT
2
OUT
3
OUT
4
OUT
5
OUT
6
OUT
7
OUT
8
1
IN
2
IN
3
IN
4
IN
5
IN
6
IN
7
IN
8
2987
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
Driver Supply Voltage, VS..................... 35 V
Output Sustaining Voltage, V
CE(sus)
...... 35 V
Continuous Output Current,
I
OUT
........................................ -500 mA*
FAULT Output Voltage, V
CE
................. 35 V
FAULT Output Current, l
C
................. 30 mA
Input Voltage, V
IN
................................. 15 V
Package Power Dissipation,
P
D
........................................ See Graph
Operating Temperature Range,
T
A
................................. -20°C to +85°C
Storage Temperature Range,
T
S
............................... -55°C to +150°C
* Outputs are disabled at approximately -500 mA
per driver.
2987
8-CHANNEL
SOURCE DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
FUNCTIONAL BLOCK DIAGRAM
OUTPUT CURRENT WAVESHAPES
OVER-CURRENT FAULT SENSE
Dwg. No. A-13,293
Dwg. No. A-13,292
Dwg. No. A-13,286
PHL
50 75 100 125 150
2.5
0.5
0
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
AMBIENT TEMPERATURE IN °C
2.0
1.5
1.0
25
Dwg. GS-004A
SUFFIX 'LW', R = 70
°C/W
θJA
SUFFIX 'A', R = 55°C/W
θJA
Copyright © 1987, 1997, Allegro MicroSystems, Inc.
2987
8-CHANNEL
SOURCE DRIVER
ELECTRICAL CHARACTERISTICS at T
A
= 25°C, V
OE
= 2.4 V, VS = 35 V
(unless otherwise noted).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Functional Supply Range V
S
7.0 — 35 V
Output Leakage Current I
CEX
VIN = 0.4 V* — <-5.0 -200 µA
Output Sustaining Voltage V
OUT(sus)
I
OUT
= -350 mA, L = 2.0 mH 35 — — V
Output Saturation Voltage V
OUT(SAT)
VIN = 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 Shutdown Threshold I
M
VIN = 2.4 V -370 -500 — mA
FAULT Leakage Current I
CEX
VCC = 35 V — <1.0 100 µA
FAULT Saturation Voltage V
CE(SAT)
IC = 30 mA — 0.3 0.8 V
Input Voltage V
IN(ON)
2.4 — — V
V
IN(OFF)
— — 0.4 V
Input Current I
IN(ON)
VIN = 2.4 V — 125 170 µA
V
IN
= 5.0 V — 840 1020 µA
V
IN
= 12 V — 1500 1800 µA
I
IN(OFF)
VIN = 0.4 V — — 15 µA
Clamp Diode Leakage Current I
R
VR = 35 V, TA = 70°C——50µA
Clamp Diode Forward Voltage V
F
IF = 350 mA — 1.5 1.8 V
Supply Current I
S(ON)
VIN = 2.4 V*, Outputs Open — 13 18 mA
I
S(OFF)
VIN = 0.4 V* — 8.0 12 mA
Thermal Shutdown T
J
— 165 — °C
Thermal Hysteresis ∆T
J
—15— °C
Propagation Delay Time t
PLH
RL = 100Ω — 0.3 0.6 µs
t
PHL
RL = 100Ω — 2.0 4.0 µs
Dead Time t
d
— 1.0 — µs
*AII inputs simultaneously.
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