Electronic Components Datasheet Search |
|
MAX6712_EXS-T Datasheet(PDF) 5 Page - Maxim Integrated Products |
|
MAX6712_EXS-T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page _______________________________________________________________________________________ 5 Detailed Description Reset Output A microprocessor’s (µP’s) reset input starts the µP in a known state. The MAX6711/MAX6712/MAX6713 assert reset to prevent code-execution errors during power- up, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset thresh- old. The MAX6713 uses an open-drain output, and the MAX6711/MAX6712 have a push-pull output stage. Connect a pull-up resistor on the MAX6713’s RESET output to any supply between 0 and 6V. Manual Reset Input Many µP-based systems require manual reset capabili- ty, allowing the operator, a test technician, or external logic circuitry to initiate a reset. Reset remains asserted while MR is low, and for at least 140ms after MR returns high. This input has an internal 20k Ω pullup resistor, so it can be left open if it is not used. MR can be driven with TTL- or CMOS-logic levels, or with open-drain/col- lector outputs. To create a manual reset function, con- nect a normally open momentary switch from MR to ground; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity. Applications Information Negative-Going VCC Transients In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the MAX6711/ MAX6712/MAX6713 are relatively immune to short-dura- tion negative-going VCC transients (glitches). Figure 1 shows typical transient duration vs. reset com- parator overdrive, for which the MAX6711/MAX6712/ MAX6713 do not generate a reset pulse. The graph was generated using a negative-going pulse applied to VCC, starting 0.5V above the actual reset threshold and end- ing below it by the magnitude indicated (reset compara- tor overdrive). The graph indicates the maximum pulse width a negative-going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input R1 100k VCC GND MR MAX6711 RESET Figure 2. RESET Valid to VCC = Ground Circuit 2 RESET (MAX6711/ MAX6713) RESET output remains low while VCC is below the reset threshold, and for at least 140ms after VCC rises above the reset threshold. 1 GND Ground PIN NAME FUNCTION RESET (MAX6712) RESET output remains high while VCC is below the reset threshold, and for at least 140ms after VCC rises above the reset threshold. _____________________Pin Description 400 320 0 1 100 1000 160 80 240 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV) 10 TA = +25 °C MAX671_L/M MAX671_R/S/T/Z Figure 1. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive 3 MR Manual Reset Input. RESET (RESET) remains asserted as long as MR is low, and for at least 140ms after MR is deasserted. This active-low input has an internal 20k Ω (typ) pull-up resistor. It can be driven from a TTL- or CMOS- logic line, or shorted to ground with a switch. Leave open or connect to VCC if unused. 4 VCC Supply Voltage (+5.0V, +3.3V, +3.0V, or +2.5V) |
Similar Part No. - MAX6712_EXS-T |
|
Similar Description - MAX6712_EXS-T |
|
|
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 |