CS8141 Cherry Semiconductor Corporation, CS8141 Datasheet
CS8141
Available stocks
Related parts for CS8141
CS8141 Summary of contents
Page 1
... The CS8141 has the same features as the CS8140, except that the CS8141 only responds to input signals (WDI) which are below the preset watchdog frequen- cy threshold ...
Page 2
Input Voltage Operating Range .................................................................................................................................................-0.5 to +26V Peak Transient Voltage (46V Load Dump @ 14V V Electrostatic Discharge (Human Body Model)...............................................................................................................................................4kV WDI Input Signal Range ...............................................................................................................................................-0.3 to +7V Internal Power Dissipation ..............................................................................................................................Internally limited Junction Temperature Range (TJ) .......................................................................................................................-40¡C to +150¡C ...
Page 3
... N/A 5 1,6-11,13-19,22 5-10 * The CS8141 uses a fused lead package. Leads 6-8 and 17-19 are fused together through the lead frame. These leads are electrically connected to IC ground and should be connected to system ground for a good thermal connection. Electrical Characteristics: continued TEST CONDITIONS ...
Page 4
V vs. V over 25ûC OUT IN LOAD 5 ENABLE IN 5.0 4 LOAD load 4 6.67W load 3 10W 3.0 load 2.5 2.0 1.5 1.0 ...
Page 5
Typical Performance Characteristics: continued Quiescent Current vs. V over ENABLE (V) IN Watchdog Frequency ...
Page 6
Dropout Voltage The input-output voltage differential at which the circuit ceases to regulate against further reduction in input volt- age. Measured when the output voltage has dropped 100mV from the nominal value obtained at 14V input, dropout voltage is dependent ...
Page 7
Figure 3: Timing Diagrams for Watchdog and ENABLE Functions 3a: V when Watchdog is held high and ENABLE = HIGH. OUT V IN ENABLE WDI 0V RESET 0V V OUT 0V 3b: V when Watchdog is held low and ENABLE ...
Page 8
... WDI(LOWER (3. WDI(UPPER (2. WDI(UPPER) DELAY For the CS8141 the lower limit is determined by the equa- tions in (a) above. The capacitor C also determines the frequency of the DELAY RESET signal and the POWER-ON- period. RESET Function The RESET function is activated when the Watchdog sig- ...
Page 9
... WDI(LOWER) FAIL 141 76 Figure 6: WDI signal for CDelay = 0.82µF using CS8141. Application Notes DELAY Energy conservation is another benefit of using a regulator with integrated microprocessor control features. Using the CS8140 or CS8141 as indicated in Figure 8, the micropro- cessor can control its own power down sequence. The momentary contact switch quickly charges C1 through R1 ...
Page 10
Battery 0.1mF (optional) Ignition 0.1mF *C1 is required if regulator is located far from the power source filter. **C2 required for stability ***R ² 80k½ Figure 7. Application Diagram 110K Figure 8. Applications diagram for CS8140. The ...
Page 11
Step 3: Increase the ESR of the capacitor from zero using the decade box and vary the load current until oscillations appear. Record the values of load current and ESR that cause the greatest oscillation. This represents the worst case ...
Page 12
... SO (tape & reel) CS8140YN14 14L PDIP CS8141YT7 7L TO-220 Straight CS8141YTVA7 7L TO-220 Vertical CS8141YTHA7 7L TO-220 Horizontal CS8141YDWF24 24L SO (internally fused leads) CS8141YDWFR24 24L SO (internally fused leads) (tape & reel) CS8141YN14 14L PDIP Rev. 2/23/99 Package Specification D Thermal Data English Min Max Min R 15 ...