Electronic Components Datasheet Search |
|
MAX810SEUR Datasheet(PDF) 6 Page - Maxim Integrated Products |
|
MAX810SEUR Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page MAX803/MAX809/MAX810 3-Pin Microprocessor Reset Circuits 6 Maxim Integrated Therefore, high-impedance CMOS logic inputs con- nected to RESET can drift to undetermined voltages. This presents no problem in most applications since most µP and other circuitry is inoperative with VCC below 1V. However, in applications where RESET must be valid down to 0V, adding a pull-down resistor to RESET causes any stray leakage currents to flow to ground, holding RESET low (Figure 2). R1’s value is not critical; 100k Ω is large enough not to load RESET and small enough to pull RESET to ground. A 100k Ω pullup resistor to VCC is also recommended for the MAX810 if RESET is required to remain valid for VCC < 1V. Interfacing to µPs with Bidirectional Reset Pins Since the RESET output on the MAX803 is open drain, this device interfaces easily with µPs that have bidirec- tional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to the microcontroller’s (µC’s) RESET pin with a single pullup resistor allows either device to assert reset (Figure 3). MAX803 Open-Drain RESET Output Allows Use with Multiple Supplies Generally, the pullup connected to the MAX803 will connect to the supply voltage that is being monitored at the IC’s VCC pin. However, some systems may use the open-drain output to level-shift from the monitored sup- ply to reset circuitry powered by some other supply (Figure 4). Note that as the MAX803’s VCC decreases RESET GND RESET INPUT RPULLUP MAX803 5V SYSTEM GND VCC +3.3V +5.0V VCC Figure 4. MAX803 Open-Drain RESET Output Allows Use with Multiple Supplies RESET GND RESET INPUT MAX803 MOTOROLA 68HCXX µP GND VCC VCC VCC Figure 3. Interfacing to µPs with Bidirectional Reset I/O 400 320 0 1 100 1000 160 80 240 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV) 10 TA = +25°C MAX8_ _J/L/M MAX8_ _R/S/T/Z Figure 1. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive R1 100k VCC GND MAX809 RESET Figure 2. RESET Valid to VCC = Ground Circuit |
Similar Part No. - MAX810SEUR |
|
Similar Description - MAX810SEUR |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |