Zakładka z wyszukiwarką danych komponentów |
|
ADM6346-42ARTZ-R7 Arkusz danych(PDF) 7 Page - Analog Devices |
|
ADM6346-42ARTZ-R7 Arkusz danych(HTML) 7 Page - Analog Devices |
7 / 12 page ADM6326/ADM6328/ADM6346/ADM6348 Rev. 0 | Page 7 of 12 THEORY OF OPERATION The ADM6326/ADM6328/ADM6346/ADM6348 are designed to protect the integrity of a system’s operation by ensuring the proper operation of the system during power-up, power-down, and brownout conditions. Ultralow supply currents make these devices particularly suitable for use in low power, portable equipment. RESET OUTPUT The ADM6326 and ADM6346 have an active low, push-pull reset output, whereas the ADM6328 and ADM6348 have an active low, open-drain reset output, which requires an external pull-up resistor. The RESET signal is guaranteed to be valid for VCC down to 1 V. When the ADM6326/ADM6328/ADM6346/ADM6348 are powered up, the RESET output remains low for a period typically equal to the RESET active timeout period of 185 ms. This feature allows adequate time for the system to power up correctly and for the power supply to stabilize before any devices are brought out of reset and are allowed to begin executing instructions. Initializing a system in this way provides a more reliable startup for micro- processor systems. When the monitored voltage falls below its associated threshold (VTH), RESET is asserted within 20 μs (typical). Asserting RESET this quickly means that the entire system can be reset at once before any part of the system’s voltage falls below its recommended operating voltage. This system reset can avoid dangerous and/or erroneous operation of a microprocessor based system. INTERFACING TO OTHER DEVICES The active low, open-drain reset output of the ADM6328 and ADM6348 makes these devices ideal for integration with devices such as microprocessors with bidirectional reset pins. Simply connect the RESET output of the ADM6328 or ADM6348 to the RESET input of the microprocessor using a single pull-up resistor to allow either device to initiate a system reset (see ). Figure 8 ADM6328/ADM6348 VCC VCC GND RESET MICROPROCESSOR SYSTEM VCC GND RPULL-UP RESET INPUT Figure 8. Interfacing to a Microprocessor with a Bidirectional Reset Pin TRANSIENT IMMUNITY To avoid unnecessary resets caused by fast power supply transients, the ADM6326/ADM6328/ADM6346/ADM6348 provide glitch immunity from negative-going VCC transients. Figure 5 shows the RESET comparator overdrive (that is, the maximum magnitude of negative-going pulses with respect to the typical threshold) vs. the pulse duration without a reset. VCC VCC VTH VTH tRD tRP VCC 0V 0V 1V RESET Figure 9. RESET Timing |
Podobny numer części - ADM6346-42ARTZ-R7 |
|
Podobny opis - ADM6346-42ARTZ-R7 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |