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LTC699CS8 Datasheet(PDF) 4 Page - Linear Technology |
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LTC699CS8 Datasheet(HTML) 4 Page - Linear Technology |
4 / 4 page 4 LTC699 S APPLICATI I FOR ATIO Figure 1. Reset Active Time Watchdog Timer The LTC699 provides a watchdog timer function to moni- tor the activity of the microprocessor. If the microproces- sor does not toggle the Watchdog Input (WDI) within the time-out period, RESET is forced to active low for a minimum of 140ms. The watchdog time-out period is fixed at a 1.0 second minimum on the LTC699, which is adequate time for most systems to service the watchdog timer immediately after a reset. Figure 2 shows the timing diagram of watchdog time-out period and reset active time. The watchdog time-out period is restarted as soon as RESET is inactive. When either a high-to-low or low-to- high transition occurs at the WDI pin prior to time-out, the watchdog time is reset and begins to time out again. To ensure the watchdog time does not time out, either a high- to-low or low-to-high transition on the WDI pin must occur at or less than the minimum time-out period. If the input to the WDI pin remains either high or low, reset pulses will be issued every 1.6 seconds typically. The watchdog time can be deactivated by floating the WDI pin. The timer is also disabled when VCC falls below the reset voltage threshold. Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 © LINEAR TECHNOLOGY CORPORATION 1992 LT/GP 0192 10K REV 0 TJMAX θJA 110 °C 180°C/W CONDITIONS: PCB MOUNT ON FR4 MATERIAL, STILL AIR AT 25 °C, COPPER TRACE TJMAX θJA 110 °C 130°C/W VCC t1 t1 = RESET ACTIVE TIME V1 = RESET VOLTAGE THRESHOLD V2 = RESET VOLTAGE THRESHOLD + RESET THRESHOLD HYSTERESIS t1 V2 V2 V1 V1 LTC699 F01 RESET t1 = RESET ACTIVE TIME t2 = WATCHDOG TIME-OUT PERIOD VCC = 5V t2 t1 t1 WDI RESET LTC699 F02 t2 t1 Figure 2. Watchdog Time-Out Period and Reset Active Time PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP S8 Package 8-Lead Plastic SOIC N8 1191 E C eA 12 3 4 8 76 5 E1 D Q1 B1 e1 S A1 L A B SYMBOL A A1 B B1 C D E INCHES 0.130 ± 0.006 0.020 MIN 0.018 ± 0.003 0.045 – 0.065 0.009 – 0.015 0.400 MAX 0.300 – 0.320 MILLIMETERS 3.302 ± 0.127 0.508 MIN 0.457 ± 0.076 1.143 – 1.651 0.229 – 0.381 10.160 MAX 7.620 – 8.128 SYMBOL E1 eA e1 L Q1 S INCHES 0.250 ± 0.010 0.325 + 0.025 –0.015 0.100 ± 0.010 0.125 MIN 0.065 TYP 0.045 ± 0.015 MILLIMETERS 6.350 ± 0.254 8.255 + 0.635 –0.381 2.540 ± 0.254 3.175 MIN 1.651 TYP 1.143 ± 0.381 h × 45° S8 1191 α C L A B e1 A1 1 2 3 4 8 7 6 5 H D E SYMBOL A A1 B C D E INCHES 0.053 – 0.069 0.004 – 0.010 0.014 – 0.019 0.008 – 0.010 0.189 – 0.197 0.150 – 0.157 MILLIMETERS 1.346 – 1.753 0.102 – 0.254 0.356 – 0.483 0.203 – 0.254 4.801 – 5.004 3.810 – 3.988 SYMBOL e H h L α INCHES 0.050 TYP 0.228 – 0.244 0.010 – 0.020 0.016 – 0.050 MILLIMETERS 1.270 TYP 5.791 – 6.198 0.254 – 0.508 0.406 – 1.270 0° – 8° TYP |
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