Electronic Components Datasheet Search |
|
MAX6444US Datasheet(PDF) 5 Page - Maxim Integrated Products |
|
MAX6444US Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 13 page µP Reset Circuits with Long Manual Reset Setup Period _______________________________________________________________________________________ 5 Detailed Description Reset Output The reset output is typically connected to the reset input of a microprocessor (µP). A µP’s reset input starts or restarts the µP in a known state. The MAX6443– MAX6452 µP supervisory circuits provide the reset logic to prevent code-execution errors during power- up, power-down and brownout conditions (see the Typical Operating Circuit). RESET changes from high to low whenever the moni- tored voltages (RSTIN or VCC) drop below the reset threshold voltages. Once VRSTIN and VCC exceed their respective reset threshold voltages, RESET remains low for the reset timeout period and then goes high. RESET is one-shot pulsed whenever selected manual reset inputs are asserted. RESET stays asserted for the nor- mal reset timeout period (140ms min). RESET is guaranteed to be in the proper output logic state for VCC inputs ≥ 1V. For applications requiring valid reset logic when VCC is less than 1V, see the Ensuring a Valid RESET Output Down to VCC = 0V section. Pin Description PIN MAX6443 MAX6444 MAX6445 MAX6446 MAX6447 MAX6448 MAX6449 MAX6450 MAX6451 MAX6452 NAME FUNCTION 1 2 2 2 2 GND Ground 21 11 1 RESET Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when VCC or RSTIN drops below its selected reset threshold and remains low for the 210ms reset timeout period after all monitored power-supply inputs exceed their selected reset thresholds. RESET is one-shot pulsed low for the reset timeout period (140ms min) after selected manual reset inputs are asserted longer than the specified setup period. For the open-drain output, use a minimum 20k Ω pullup resistor to VCC . 3—3—3 Manual Reset Input, Active Low. Internal 50k Ω pullup to VCC. Pull MR1 low for the typical input pulse width (tMR) to one-shot pulse RESET for the reset timeout period. —3 —3 — MR1 Manual Reset Input, Active Low. Pull both MR1 and MR2 low for the typical input pulse width (tMR) to one- shot pulse RESET for the reset timeout period. 44 44 4 VCC VCC Voltage Input. Power supply and input for the primary microprocessor voltage reset monitor. —5 —6 — MR2 Manual Reset Input, Active Low. Internal 50k Ω pullup to VCC. Pull both MR1 and MR2 low for the typical input pulse width (tMR) to one-shot pulse RESET for the reset timeout period. —— 5 — 6 MR2 Manual Reset Input. Pull the MR2 high to immediately one-shot pulse RESET for the reset timeout period. — — — 5 5 RSTIN Reset Input. High-impedance input to the adjustable reset comparator. Connect RSTIN to the center point of an external resistor-divider to set the threshold of the externally monitored voltage. |
Similar Part No. - MAX6444US |
|
Similar Description - MAX6444US |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |