1
2
3
4
5
6
7
8
V
S
GND
11
12
13
14
15
16
17
18
8-CHANNEL SOURCE DRIVER
Recommended for applications requiring separate logic and load grounds,
load supply voltages to 30 V, and load currents to 250 mA, the UDN2985A
source driver is used as an interface between standard low-power digital logic
and LEDs, relays, and solenoids. The outputs feature saturated transistors for
low collector-emitter saturation voltages.
The UDN2985A driver is for use with 5 V logic systems: TTL, Schottky
TTL, DTL, and CMOS. This device has a minimum output breakdown rating
of 30 V with a minimum output sustaining voltage of 15 V. The output is
switched on by an active-high input level.
Under normal operating conditions, this device can source up to 120 mA
for each of the eight outputs at an ambient temperature of 75
°C and a supply
voltage of 15 V. It incorporates input current-limiting resistors and output
transient-suppression diodes.
The UDN2985A source driver is supplied in an 18-pin dual in-line
package. All inputs are on one side of the package, output pins on the other,
to simplify printed wiring board layout.
Always order by complete part number:
UDN2985A .
Dwg. No. DS-1013
FEATURES
I TTL, DTL, or CMOS Compatible Inputs
I 250 mA Output Source Current Capability
I Output Transient-Suppression Diodes
I 30 V Minimum Output Breakdown Voltage
I Low Output-Saturation Voltage
PARTIAL SCHEMATIC DIAGRAM
1 of 8 DRIVERS
Data Sheet
29310.2A
Dwg. No. A-10,243
2985
ABSOLUTE MAXIMUM RATINGS
at T
A
= 25
°
C
Driver Supply Voltage, V
S
.................. 30 V
Continuous Output Current,
I
OUT
........................................ -250 mA
Input Voltage, V
IN
............................... 20 V
Package Power Dissipation,
P
D
.............................................. 2.2 W*
Operating Temperature Range,
T
A
............................... -20
°
C to +85
°
C
Storage Temperature Range,
T
S
............................... -55
°
C to +150
°
C
*Derate at the rate of 18 mW/
°C above
T
A
= 25
°C.
2985
8-CHANNEL
SOURCE DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Limits
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Output Leakage Current
I
CEX
V
IN
= 0.4 V, V
OUT
= 0 V
--
<-1.0
-100
µA
Output Sustaining Voltage
V
CE(sus)
l
OUT
= -120 mA, L = 3 mH
15
--
--
V
Output Saturation Voltage
V
CE(SAT)
V
IN
= 2.4, l
OUT
= -60 mA
--
0.8
1.1
V
V
IN
= 2.4, l
OUT
= -120 mA
--
0.9
1.2
V
Input Current Voltage
I
IN(ON)
V
IN
= 2.4 V
--
90
225
µA
V
IN
= 5.0 V
--
280
650
µA
I
IN(OFF)
V
IN
= 0.4 V
--
10
15
µA
Supply Current
I
S
V
S
= 30 V, V
IN
= 2.4 V
--
10
15
mA
(outputs open)
Clamp Diode
I
R
V
R
= 30 V, T
A
= 70
°C
--
<1.0
50
µA
Leakage Current
Clamp Diode
V
F
I
F
= 120 mA
--
1.1
2.0
V
Foward Voltage
Turn-On Delay
t
ON
--
0.5
1.0
µs
Turn-Off Delay
t
OFF
--
5.0
10
µs
ELECTRICAL CHARACTERISTICS at T
A
= 25
°
C, V
S
= 30 V (unless otherwise noted).
COMMON-CATHODE LED DRIVER
NOTE: Negative current is defined as coming out of (sourcing) the specified device pin.
Dwg. No. DS-1014
Copyright © 1984, 2000 Allegro MicroSystems, Inc.
2985
8-CHANNEL
SOURCE DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
POWER SOURCE DRIVERS
IN ORDER OF 1) OUTPUT CURRENT, 2) OUTPUT VOLTAGE, 3) NUMBER OF DRIVERS
Output Ratings *
Features
Serial
Latched
Diode
Saturated
Internal
mA
V
#
Input
Drivers
Clamp
Outputs
Protection
Part Number
-25
60
8
X
5815
60
10
X
X
active pull-down
5810-F and 6809/10
60
12
X
X
active pull-down
5811 and 6811
60
20
X
X
active pull-down
5812-F and 6812
60
32
X
X
active pull-down
5818-F and 6818
85
8
61 1
8
-120
-25
8
X
X
2585
30
8
X
X
2985
50
8
X
X
X
X
5895
-350
35
8
X
X
2987
50
8
X
2981 and 2982
50
8
X
X
X
5891
-50
8
X
2580
80
8
X
2983 and 2984
80
8
X
X
X
5890
-80
8
X
2588
-500
6
1
MOSFET
X
2525 and 2535
6
2
MOSFET
X
2526 and 2536
-4000
60
4
X
2944
* 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.
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
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 performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
PDF 
ZIP