Pin Configuration
Figure 3. Pin Configuration (Top View)
Thermal Characteristics (1)
Package
8-Pin Small-Outline Integrated Circuit (SOIC)
Θ JL(2)
40
Θ JT(3)
31
Θ JA(4)
89
Ψ JB(5)
43
Ψ JT(6)
3
Unit
°C/W
Notes:
1. Estimates derived from thermal simulation; actual values depend on the application.
2. Theta_JL ( Θ JL ): Thermal resistance between the semiconductor junction and the bottom surface of all the leads
(including any thermal pad) that are typically soldered to a PCB.
3. Theta_JT ( Θ JT ): Thermal resistance between the semiconductor junction and the top surface of the package,
assuming it is held at a uniform temperature by a top-side heatsink.
4. Theta_JA ( Θ JA ): Thermal resistance between junction and ambient, dependent on the PCB design, heat sinking,
and airflow. The value given is for natural convection with no heatsink, as specified in JEDEC standards
JESD51-2, JESD51-5, and JESD51-7, as appropriate.
5. Psi_JB ( Ψ JB ): Thermal characterization parameter providing correlation between semiconductor junction
temperature and an application circuit board reference point for the thermal environment defined in Note 4. For
the SOIC-8 package, the board reference is defined as the PCB copper adjacent to pin 6.
6. Psi_JT ( Ψ JT ): Thermal characterization parameter providing correlation between the semiconductor junction
temperature and the center of the top of the package for the thermal environment defined in Note 4.
Pin Definitions
Pin#
1
8
3
2
4
7
5
6
Name
ENA
ENB
GND
INA
INB
OUTA
OUTB
VDD
Description
Enable Input for Channel A . Pull pin LOW to inhibit driver A. ENA has TTL thresholds.
Enable Input for Channel B . Pull pin LOW to inhibit driver B. ENB has TTL thresholds.
Ground . Common ground reference for input and output circuits.
Input to Channel A .
Input to Channel B .
Gate Drive Output A : Held LOW unless required input is present and V DD is above the internal
voltage threshold where the IC is functional.
Gate Drive Output B (inverted from the input). Held HIGH unless the required input is present
and V DD is above the internal voltage threshold where the IC is functional.
Supply Voltage . Provides power to the IC.
? 2010 Fairchild Semiconductor Corporation
FAN3278 ? Rev. 1.0.1
3
www.fairchildsemi.com
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