DRV8870: Output Characteristics in Sleep/Coast/High-Z Mode

I'm using a DRV8870 in order to provide a bidirectional drive for a DC motor, but I also need one of the output lines to idle high when both inputs are low (DRV8870 is in sleep mode). I thought that this would be permissible as the outputs are high impedance when both of the inputs are low, however it seems that there is about 12mA flowing into pin 8 when pulled up to VM with a 300 ohm resistor, dropping the output voltage to ~8V and increasing the quiescent current in this battery powered system. Is there an internal path that I'm not considering in the DRV8870? I may be able to work around it in software if necessary, but would like to understand the issue further before making that determination.