LS6301

LSI/CSI LS6301 U® L LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 A3800 AC LINE FREQUENCY TIMER June 2004 FEATURES: Selectable Timing Intervals Internal Voltage Regulator Schmitt Trigger on all inputs for high noise immunity Power-On-Reset Built-in discharge when power is removed Output to drive an SCR connected to load Output to flash an indicator when timeout has occurred LS6301 (DIP); LS6301-S (SOIC) - See Figure 1 DESCRIPTION: The circuit operates by counting AC power line cycles. When the selected timeout occurs, the circuit will switch an external power device. Selectable timing intervals using 3 mode pins are indicated in Table 1. The circuit contains a Power-On-Reset (POR) to zero out all the timing counters upon power-up. A positive or negative transition of any of the A, B or C timing mode input pins will cause the timer to reset and begin again. Once time-out is achieved, it remains latched until a mode pin transition occurs or POR occurs. TABLE 1. TIMING INTERVALS (60 Hz INPUT) A INPUT B INPUT C INPUT TIMING I NTERVAL Vss Vss Vss 15 Minutes Vss Vss VDD 2 Minutes Vss VDD Vss 30 Minutes Vss VDD VDD 45 Minutes VDD Vss Vss 30 Seconds VDD Vss VDD 15 Minutes VDD VDD Vss 1 Hour VDD VDD VDD 2 Hours PIN ASSIGNMENT - TOP VIEW B1 OUT 1 2 OUT 2 3 VSS (+V) 4 FIGURE 1 LS6301 LSI 8 VDD (-V) 7 AC IN 6A 5C The C input mode pin contains an internal pull up resistor for direc...