IP2022 User’s Manual—In-System Debugging www.ubicom.com 353 5.6 ISD/ISP Electrical Specifications The signal levels for the ISD/ISP interface are listed in Table 5-3. Table 5-3  ISD/ISP Electrical Specifications Symbol Parameter Min Typ Max    Units TSS V_OH Output high voltage (I = 0 mA) 2.3 3.6 V TSS V_OH Output high voltage (I = 4 mA) 2.3 3.6 V TSS V_OL Output low voltage (I = 0 mA) 0 0.5 V TSS V_OL Output low voltage (I = 4 mA) 0 0.5 V TSCK V_OH Output high voltage (I = 0 mA) 2.3 3.6 V TSCK V_OH Output high voltage (I = 4 mA) 2.3 3.6 V TSCK V_OL Output low voltage (I = 0 mA) 0 0.5 V TSCK V_OL Output low voltage (I = 4 mA) 0 0.5 V TSI V_OH Output high voltage (I = 0 mA) 2.3 3.6 V TSI V_OH Output high voltage (I = 4 mA) 2.3 3.6 V TSI V_OL Output low voltage (I = 0 mA) 0 0.5 V TSI V_OL Output low voltage (I = 4 mA) 0 0.5 V TSO V_IH Input high voltage 1.2 - V TSO V_IL Input low voltage - 0.6 OSC V_OH Output high voltage (I = 0 mA) 2.3 3.6 OSC V_OH Output high voltage (I = 1 mA) 2.3 3.6 OSC V_OL Output low voltage (I = 0 mA) -0.3 0.5 OSC V_OL Output low voltage (I = 1 mA) -0.3 0.5