The TLV3601 EVM is able to support both the TLV3601 and TLV3603 devices. A key difference between devices is the way hysteresis is able to be applied.

The TLV3601 needs hysteresis applied through external components R6, a feedback resistor, and R1, a series resistor for IN+. Necessary calculations for the hysteric window must be made to figure out the value of both resistors.

Figure 6-5 TLV3601 Hysteresis Schematic

The TLV3603 utilizes an extra pin not available on the TLV3601, called LE/HYST. This pin is able to adjust the internal hysteresis of the device, through the attachment of an external resistor (R7) connecting to VEE. To understand the relationship between the resistor value of R7 and the amount of hysteresis created, see TLV3603 data sheet.

Alternatively, the pin also functions as an inverting Latch Enable. If the pin is connected to VEE, the device will hold the output state for as long as the pin remains connected to that voltage. If the pin is connected to VCC, the device will function normally with no hysteresis. Connections for VCC and VEE are supplied through J9 with R7 being populated with a 0 Ω resistor. However, if it is necessary to control when the device latches, a pulsing signal can be applied to SMA connector J6, with SMA connector J7 being the corresponding sense line for that input.

Figure 6-6 TLV3603 Hysteresis Schematic