SAD1009

Philips Semiconductors Preliminary specification Universal DAC (UDAC) GENERAL DESCRIPTION SAD1009 The SAD1009 is intended as a peripheral to a microcontroller-based servo system in video cassette recorders. The device relieves the microcontroller of some of the real time functions. These functions include; generation of programmable pulse width signals (duty factor etc.) and accurate measurement of time period signals (tacho signal etc.). The SAD1009 has nine programmable output ports. All functions of the UDAC are programmable. Commands and data from the microcontroller are loaded via a bidirectional bus using a 16-bit format. Data from the time period measurement is transferred to the microcontroller via the same bidirectional bus, also using a 16-bit format. The clock signal for this device is provided by the quartz oscillator of the microcontroller. Features Generation of programmable pulse width signals Measurement of time period signals All functions are programmable QUICK REFERENCE DATA PARAMETER Supply Supply voltage range Inputs Input voltage LOW HIGH Input leakage current Input capacitance Outputs Output voltage LOW HIGH Output sink current Output source current PACKAGE OUTLINES SAD1009P: 24-lead DIL; plastic (SOT101A); SOT101-1; 1996 November 18. SAD1009T: 24-lead mini-pack; plastic (SO24; SOT137A); SOT 137-1; 1996 November 18. IOL = 1,6 mA IOH = − 1,0 mA VOL VOH IO − IO −− VDD −0,4 −− −− −− 1,6 1,0 0,4 V V mA mA VIL VIH ± II CI −− 2,4 −− −− −− 1 7,5 0,8 V...