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2987 8-CHANNEL SOURCE DRIVER
2987
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 25C 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.
Data Sheet 29310.4A
IN 1 IN 2 IN 3 IN 4 IN 5 IN 6 IN 7 IN 8 FAULT OE/R
1 2 3 4 5 6 7 8 9
OE x8 OEN FF
20 19 18 17 16 15 14 13 12
SENSEN
OUT 1 OUT 2 OUT 3 OUT 4 OUT 5 OUT 6 OUT 7 OUT 8 GROUND V S
10
11
Dwg. PP-067
Note that the UDN2987A (DIP) and the UDN2987LW (SOIC) are electrically identical and share a common terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
at TA = +25C
Driver Supply Voltage, VS ..................... 35 V Output Sustaining Voltage, VCE(sus) ...... 35 V Continuous Output Current, IOUT ........................................ -500 mA* FAULT Output Voltage, VCE ................. 35 V FAULT Output Current, lC ................. 30 mA Input Voltage, VIN ................................. 15 V Package Power Dissipation, PD ........................................ See Graph Operating Temperature Range, TA ................................. -20C to +85C Storage Temperature Range, TS ............................... -55C to +150C
* Outputs are disabled at approximately -500 mA per driver.
FEATURES
s s s s s s s 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
Always order by complete part number: Part Number UDN2987A UDN2987LW Package 20-Pin DIP 20-Lead Wide-Body SOIC
2987 8-CHANNEL SOURCE DRIVER
FUNCTIONAL BLOCK DIAGRAM
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
2.5
2.0
SU FF IX
1.5
SU FF IX
'A ', R
J
A
=
'LW ', R
55 C /W
1.0
J
A=
70 C /W
0.5
0 25 50 75 100 125 AMBIENT TEMPERATURE IN C 150
Dwg. GS-004A
Dwg. No. A-13,286
OVER-CURRENT FAULT SENSE
OUTPUT CURRENT WAVESHAPES
PHL
Dwg. No. A-13,292
Dwg. No. A-13,293
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1987, 1997, Allegro MicroSystems, Inc.
2987 8-CHANNEL SOURCE DRIVER
ELECTRICAL CHARACTERISTICS at TA = 25C, VOE = 2.4 V, VS = 35 V (unless otherwise noted).
Characteristic Functional Supply Range Output Leakage Current Output Sustaining Voltage Output Saturation Voltage Symbol VS ICEX VOUT(sus) VOUT(SAT) VIN = 0.4 V* IOUT = -350 mA, L = 2.0 mH VIN = 2.4 V, IOUT = -100 mA VIN = 2.4 V, IOUT = -225 mA VIN = 2.4 V, IOUT = -350 mA Channel Shutdown Threshold FAULT Leakage Current FAULT Saturation Voltage Input Voltage IM ICEX VCE(SAT) VIN(ON) V IN(OFF) Input Current IIN(ON) VIN = 2.4 V VIN = 5.0 V VIN = 12 V IIN(OFF) Clamp Diode Leakage Current Clamp Diode Forward Voltage Supply Current IR VF IS(ON) IS(OFF) Thermal Shutdown Thermal Hysteresis Propagation Delay Time TJ TJ tPLH tPHL Dead Time *AII inputs simultaneously. td RL = 100 RL = 100 VIN = 0.4 V VR = 35 V, TA = 70C IF = 350 mA VIN = 2.4 V*, Outputs Open VIN = 0.4 V* VIN = 2.4 V VCC = 35 V IC = 30 mA Test Conditions Min. 7.0 -- 35 -- -- -- -370 -- -- 2.4 -- -- -- -- -- -- -- -- -- -- -- -- -- -- Limits Typ. Max. -- <-5.0 -- 1.6 1.7 1.8 -500 <1.0 0.3 -- -- 125 840 1500 -- -- 1.5 13 8.0 165 15 0.3 2.0 1.0 35 -200 -- 1.8 1.9 2.0 -- 100 0.8 -- 0.4 170 1020 1800 15 50 1.8 18 12 -- -- 0.6 4.0 -- Units V A V V V V mA A V V V A A A A A V mA mA C C s s s
2987 8-CHANNEL SOURCE DRIVER
ALLOWABLE OUTPUT CURRENT AS A FUNCTION OF DUTY CYCLE
(UDN2987A shown, multiply by 78% for UDN2987LW)
At +25C
APPLICATIONS INFORMATION AND CIRCUIT DESCRIPTION
As with all power integrated circuits, the UDN2987A and UDN2987LW 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 output 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 shutdown. 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 35 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 conditions with a shorted load. The latches are also reset during power up, regardless of the state of the OE/R input. The load current causes a small voltage drop across the internal low-value sense resistor. This voltage is compared to the voltage drop across a reference resistor with a constant current. The two resistors are matched to eliminate errors due to manufacturing tolerances or temperature effects. Each channel includes a comparator and its own latch. An over-current fault (VSENSE > VREF) will set the affected latch and shut down only that channel. All other channels will continue to operate normally. The latch includes a 1 s delay (td) to prevent unwanted triggering due to crossover currents generated when switching inductive loads. For an abrupt short circuit, the delay and output switching times will allow a brief, permissable current in excess of the trip current before the output driver is turned OFF. A common thermal shutdown disables all outputs if the chip temperature exceeds +165C. At thermal shutdown, all latches are reset. The outputs are disabled until the chip cools down to about +150C (thermal hysteresis). A common open-collector FAULT output is used to indicate any channel over-current condition or chip thermal shutdown.
At +50C
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2987 8-CHANNEL SOURCE DRIVER
UDN2987A
Dimensions in Inches (controlling dimensions)
0.014 0.008
20
11
0.430 0.280 0.240
MAX
0.300
BSC
1
0.070 0.045
0.100 1.060 0.980
BSC
10
0.005
MIN
0.210
MAX
0.015
MIN
0.150 0.115 0.022 0.014
Dwg. MA-001-20 in
Dimensions in Millimeters (for reference only)
0.355 0.204
20
11
10.92 7.11 6.10
MAX
7.62
BSC
1
1.77 1.15
2.54 26.92 24.89
BSC
10
0.13
MIN
5.33
MAX
0.39
MIN
3.81 2.93 0.558 0.356
Dwg. MA-001-20 mm
NOTES: 1. Exact body and lead configuration at vendor's option within limits shown. 2. Lead spacing tolerance is non-cumulative. 3. Lead thickness is measured at seating plane or below.
2987 8-CHANNEL SOURCE DRIVER
UDN2987LW
Dimensions in Inches (for reference only)
20 11 0.0125 0.0091
0.2992 0.2914
0.419 0.394
0.050 0.016 0.020 0.013
1
2
3 0.5118 0.4961
0.050
BSC
0 TO 8
0.0926 0.1043 0.0040 MIN.
Dwg. MA-008-20 in
Dimensions in Millimeters (controlling dimensions)
20 11 0.32 0.23
7.60 7.40
10.65 10.00
1.27 0.40 0.51 0.33
1
2
3 13.00 12.60
1.27
BSC
0 TO 8
2.65 2.35 0.10 MIN. Exact body and lead configuration at vendor's option within limits shown. Lead spacing tolerance is non-cumulative.
Dwg. MA-008-20 mm
NOTES: 1. 2.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2987 8-CHANNEL SOURCE DRIVER
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2987 8-CHANNEL SOURCE DRIVER
POWER SOURCE DRIVERS SELECTION GUIDE
IN ORDER OF 1) OUTPUT CURRENT, 2) OUTPUT VOLTAGE, 3) NUMBER OF DRIVERS
Output Ratings * mA -25 V 60 60 60 60 60 85 -25 30 50 35 50 50 -50 80 80 -80 # 8 10 12 20 32 8 8 8 8 8 8 8 8 8 8 8
Serial Input Latched Drivers
Features
Diode Clamp Saturated Outputs Internal Protection
-120
-350
- X X X X - - - X - - X - - X -
X X X X X - - - X - - X - - X -
-
Active Pull-Down Active Pull-Down Active Pull-Down Active Pull-Down
- X X X X X X X X X X
- - - - - - X X X - - - - - - -
- - - - - - - - - X - - - - - -
Part Number 5815 5810-F and 6809/10 5811 and 6811 5812-F and 6812 5818-F and 6818 6118 2585 2985 5895 2987 2981 and 2982 5891 2580 2983 and 2984 5890 2588
*
Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits or over-current protection voltage limits. Complete part number includes additional characters to indicate operating temperature range and package style.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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