SLRS060C May   2012  – November 2016 ULN2003V12

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Diagram
    3. 7.3 Feature Description
      1. 7.3.1 TTL and Other Logic Inputs
      2. 7.3.2 Input RC Snubber
      3. 7.3.3 High-impedance Input Drivers
    4. 7.4 Device Functional Modes
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Unipolar Stepper Motor Driver
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Application Curves
      2. 8.2.2 Inverting Logic Level Shifter
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
      3. 8.2.3 Maximum Supply Selector
        1. 8.2.3.1 Design Requirements
      4. 8.2.4 Constant Current LED Driver
        1. 8.2.4.1 Design Requirements
      5. 8.2.5 NOR Logic Driver
        1. 8.2.5.1 Design Requirements
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
      1. 10.3.1 On-chip Power Dissipation
      2. 10.3.2 Thermal Reliability
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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8 Applications and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

Peripheral drivers such as the ULN2003V12 are primarily used in the following applications:

  • Stepper Motor Driving
  • Relay and Solenoid Driving
  • LED Driving
  • Logic Level Shifting

Peripheral Drivers are not limited to one specific application at a time, but can be used for all of these applications simultaneously. For example, one device could enable driving one stepper motor, driving one relay, driving an LED, and shifting a 3.3-V logic signal to a 12-V logic signal at the same time.

8.2 Typical Applications

8.2.1 Unipolar Stepper Motor Driver

The Figure 4 shows an implementation of ULN2003V12 for driving a unipolar stepper motor.

ULN2003V12 Driver_StepperMotorDriver.gif Figure 4. ULN2003V12 as a Stepper Motor Driver

8.2.1.1 Design Requirements

The unconnected input channels can be used for other functions. When an input pin is left open, the internal 300-kΩ pulldown resistor pulls the respective input pin to GND potential. For higher noise immunity use an external short across an unconnected input and GND pins. See Stepper Motor Driving with Peripheral Drivers (SLVA767) for additional information regarding stepper motor driving.

8.2.1.2 Application Curves

ULN2003V12 tc5_lrs059.png Figure 5. Freewheeling Diode VF vs IF

8.2.2 Inverting Logic Level Shifter

To use ULN2003V12 as an open-drain inverting logic level shifter, configure the device as shown in Figure 6. The device input and output logic levels can also be set independently. When using different channel input and output logic voltages, connect the ULN2003V12 COM pin to the maximum voltage.

ULN2003V12 Driver_LevelShifter.gif Figure 6. ULN2003V12 as Inverting Logic Level Shifter

8.2.2.1 Design Requirements

ULN2003V12 can be used in digital applications requiring logic level shifting up to 16 V at the output side. Because the device pulls the output transistor low when input is high, this configuration is useful for applications requiring inverting logic with the level shifting operation.

8.2.2.2 Detailed Design Procedure

To operate in level shifting operation, timing and propagation delay must be kept in mind. Depending on the pullup resistors at the output ULN2003V12 exhibits different propagation delays. The choice of pullup resistor is dependent on the drive required at the output. The device can pull output to ground with the output transistor, but to transition from low to high output resistor plays a critical role. If high drive at output is required, use Equation 1 to calculate a lower resistance.

Equation 1. RPullup = OUT1_VSUP / IDrive

For example, a drive of 5 mA is required at the output for 1.8-V to 5-V translation application.

Equation 2. RPullup = OUT1_VSUP / IDrive = 5 / 0.005 =1k

8.2.3 Maximum Supply Selector

The Figure 7 implements a maximum supply selector along with a 4-channel logic level shifter using a single ULN20003V12.

ULN2003V12 MaximumSupplySelector.gif Figure 7. ULN2003V12 as a Maximum Supply Selector

8.2.3.1 Design Requirements

This setup configures ULN2003V12’s channel clamp diodes OUT5 to OUT7 in a diode-OR configuration and thus the maximum supply among V1, V2, and V3 becomes available at the COM pin. The maximum supply is then used as a pullup voltage for level shifters. Limit the net GND pin current to less than 100-mA DC to ensure reliability of the conducting diode. The unconnected inputs IN5 to IN7 are pulled to GND potential through
300-kΩ internal pulldown resistor.

8.2.4 Constant Current LED Driver

When configured as per Figure 8, the ULN2003V12 outputs OUT1 to OUT6 act as independent constant current sources.

ULN2003V12 ConstantCurrentDriver.gif Figure 8. ULN2003V12 as a Constant Current Driver

8.2.4.1 Design Requirements

The current flowing through the resistor R1 is mirrored on all other channels. To increase the current sourcing connect several output channels in parallel. To ensure best current mirroring, set voltage drop across connected load such that VOUTx matches VOUT7.

8.2.5 NOR Logic Driver

Figure 9 shows a NOR Logic driver implementation using the ULN2003V12 device.

ULN2003V12 NORDriver.gif Figure 9. ULN2003V12 as a NOR driver

8.2.5.1 Design Requirements

The output channels sharing a common pullup resistor implement a logic NOR of the respective channel inputs. Node A is controlled by inputs IN1 and IN2 as described in Table 2 (Positive Logic Function: A = IN1+IN2). Node B is controlled by inputs IN3 and IN4 as described in Table 3 (Positive Logic Function: B = IN3+IN4). Node C is controlled by inputs IN5, IN6, and IN7 as described in Table 4 (Positive Logic Function C = IN5+IN6+IN7).

Table 2. Output A Function Table

IN1 IN2 A
L L H
X H L
H X L

Table 3. Output B Function Table

IN3 IN4 B
L L H
X H L
H X L

Table 4. Output C Function Table

IN5 IN6 IN7 C LED
L L L H OFF
X X H L ON
X H X L ON
H X X L ON