Allegro UDN2985A Datasheet
Data Sheet
29310.2A†
2985
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
1
2
3
4
5
6
7
8
V
S
18
17
16
15
14
13
12
11
GND
Dwg. No. A-10,243
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.
ABSOLUTE MAXIMUM RATINGS
at T
= 25°C
A
Driver Supply Voltage, VS.................. 30 V
Continuous Output Current,
I
........................................ -250 mA
OUT
Input Voltage, VIN............................... 20 V
Package Power Dissipation,
PD.............................................. 2.2 W*
Operating Temperature Range,
TA............................... -20°C to +85°C
Storage Temperature Range,
TS............................... -55°C to +150°C
*Derate at the rate of 18 mW/°C above
TA= 25°C.
FEATURES
■ TTL, DTL, or CMOS Compatible Inputs
■ 250 mA Output Source Current Capability
■ Output Transient-Suppression Diodes
■ 30 V Minimum Output Breakdown Voltage
■ Low Output-Saturation Voltage
PARTIAL SCHEMATIC DIAGRAM
1 of 8 DRIVERS
Dwg. No. DS-1013
Always order by complete part number: UDN2985A .
2985
8-CHANNEL
SOURCE DRIVER
ELECTRICAL CHARACTERISTICS at TA = 25°C, VS = 30 V (unless otherwise noted).
Limits
Characteristics Symbol Test Conditions Min. Typ. Max. Units
Output Leakage Current I
Output Sustaining Voltage V
Output Saturation Voltage V
Input Current Voltage I
Supply Current I
CEX
CE(sus)
CE(SAT)
IN(ON)
I
IN(OFF)
S
VIN = 0.4 V, V
l
= -120 mA, L = 3 mH 15 — — V
OUT
V
= 2.4, l
IN
= 2.4, l
V
IN
VIN = 2.4 V — 90 225 µA
= 5.0 V — 280 650 µA
V
IN
VIN = 0.4 V — 10 15 µA
VS = 30 V, VIN = 2.4 V — 10 15 mA
= 0 V — <-1.0 -100 µA
OUT
= -60 mA — 0.8 1.1 V
OUT
= -120 mA — 0.9 1.2 V
OUT
(outputs open)
Clamp Diode I
R
VR = 30 V, TA = 70°C — <1.0 50 µA
Leakage Current
Clamp Diode V
F
IF = 120 mA — 1.1 2.0 V
Foward Voltage
Turn-On Delay t
Turn-Off Delay t
ON
OFF
NOTE: Negative current is defined as coming out of (sourcing) the specified device pin.
— 0.5 1.0 µs
— 5.0 10 µs
COMMON-CATHODE LED DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1984, 2000 Allegro MicroSystems, Inc.
Dwg. No. DS-1014
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