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CS8141YDWF24 Datasheet(PDF) 1 Page - Cherry Semiconductor Corporation |
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CS8141YDWF24 Datasheet(HTML) 1 Page - Cherry Semiconductor Corporation |
1 / 12 page The CS8140 is a 5V Watchdog Regulator with protection circuitry and three logic control functions that allow a microprocessor to control its own power supply. The CS8140 is designed for use in automotive, switch mode power supply post regulator, and bat- tery powered systems. Basic regulator performance character- istics include a low noise, low drift, 5V ± 4% precision output voltage with low dropout voltage (1.25V @ IOUT = 500mA) and low quiescent current (7mA @ IOUT = 500mA). On board short circuit, ther- mal, and overvoltage protection make it possible to use this regulator in particu- larly harsh operating environments. The Watchdog logic function monitors an input signal (WDI) from the micro- processor or other signal source. When the signal frequency moves outside externally programmable window lim- its, a signal is generated ( ). An external capacitor (CDELAY) programs the watchdog win- dow frequency limits as well as the power on reset (POR) and delay. The function is activated by any of three conditions: the watchdog sig- nal moves outside of its preset limits; the output voltage drops out of regula- tion by more than 4.5%; or the IC is in its power up sequence. The sig- nal is independent of VIN and reliable down to VOUT = 1V. In conjunction with the Watchdog, the ENABLE function controls the regula- torÕs power consumption. The CS8140Õs output stage and its attendant circuitry are enabled by setting the ENABLE lead high. The regulator goes into sleep mode (IOUT = 250µA) when the ENABLE lead goes low and the watch- dog signal moves outside its preset window limits. This unique combina- tion of control functions in the CS8140 gives the microprocessor control over its own power down sequence: i.e. it gives the microprocessor the flexibility to perform housekeeping functions before it powers down. 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. RESET RESET RESET RESET RESET 1 Features Gnd WDI ENABLE VIN VOUT Delay Overvoltage Overtemperature Reference & Bias Short Circuit Watchdog Undervoltage Regulation RESET Control Logic ENABLE RESET Delay Sense *NOTE: shorted together on 7 Lead TO-220 * s 5V ± 4%, 500mA Output Voltage s µP Compatible Control Functions Watchdog ENABLE s Low Dropout Voltage (1.25V @ 500mA) s Low Quiescent Current (7mA @ 500mA) s Low Noise, Low Drift s Low Current SLEEP Mode (IQ = 250µA) s Fault Protection Thermal Shutdown Short Circuit 60V Peak Transient Voltage RESET Package Options 7 Lead TO-220 Tab (Gnd) 14 Lead PDIP 24 Lead SOIC Wide 5V, 500mA Linear Regulator with ENABLE, , and Watchdog RESET 1 1 Delay VOUT Sense WDI NC NC NC NC NC VIN ENABLE RESET Gnd NC NC NC Gnd NC NC NC NC NC NC NC CS8140/1 Description Block Diagram 1 Delay VOUT Sense WDI NC NC NC NC NC Gnd VIN ENABLE RESET NC 1VIN 2 ENABLE 3 4 Gnd 5 Delay 6 WDI 7VOUT RESET A Company ¨ Rev. 2/23/99 Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com |
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