UDx2987-6

• 4.75 to 35 V driver supply voltage
• Output enable-disable (OE/R)
• 350 mA output source current
• Overcurrent protected
• Internal ground clamp diodes
• Output Breakdown Voltage 35 V minimum
• TTL, DTL, PMOS, or CMOS compatible inputs
• Internal Thermal Shutdown (TSD)

Description

Providing overcurrent protection for each of its eight sourcing outputs, the UDN2987A-6 and UDN2987LW-6 drivers are used as an interface between standard low-level logic and relays, motors, solenoids, LEDs, and incandescent lamps. These devices include thermal shut down 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. The OE/R function can be especially important during power-up, in preventing floating inputs from turning on the outputs.

Under normal operating conditions, each of eight outputs will source in excess of 100 mA continuously at an ambient temperature of 25°C and a supply of 35 V. The overcurrent fault circuit will protect the device from short-circuits to ground with supply voltages of up to 30 V.

The inputs are compatible with 5 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. Compared to their predecessor devices, the UDN2987A and UDN2987LW, the UDN2987A-6 and UDN2987LW-6 have a significantly faster TPHL (200 ns typical) and a lower driver supply voltage rating (4.75 V), which allows the use of 5 V logic.

The UDN2987A-6 is supplied in a 20-pin dual in-line plastic (DIP) package; the UDN2987LW-6 is supplied in a 20-lead small-outline (SOIC-W) plastic package. All packages are lead (Pb) free, with 100% matte-tin leadframe plating.