Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
MAX6335 Datasheet(PDF) 4 Page - Maxim Integrated Products |
|
MAX6335 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page 4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset 4 _______________________________________________________________________________________ Pin Description GND Ground 1 — RESET Active-Low Reset Output. RESET remains low while VCC is below the reset threshold, or MR is asserted and for a reset timeout period (tRP) after VCC rises above the reset threshold, or MR is deasserted. RESET on the MAX6337 is open-drain. 2 RESET Active-High Reset Output. RESET remains high while VCC is below the reset threshold, or MR is asserted and for a reset timeout period (tRP) after VCC rises above the reset threshold, or MR is deasserted. RESET also asserts when MR is low. NAME FUNCTION MAX6335 MAX6336 MAX6337 1 2 — PIN Applications Information Manual-Reset Inputs Many µP-based products require manual-reset capabil- ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for the reset active timeout period after MR returns high. MR has an internal 20k Ω pull-up resistor, so it can be left unconnected if not used. Connect a normally open momentary switch from MR to GND to create a manual-reset function; external debounce circuitry is not required. Interfacing to µPs with Bidirectional Reset Pins Since the RESET output on the MAX6337 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 pull-up resistor allows either device to assert reset (Figure 1). Negative-Going VCC Transients In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going VCC transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive graph. The graph shows the maximum pulse width that a negative-going VCC transient may typically have without issuing a reset signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases. Ensuring a Valid Reset Output down to VCC = 0 When VCC falls below 1V and approaches the minimum operating voltage of 0.7V, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to the RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most µPs and circuitry do not operate at VCC below 1V. For the MAX6336, where RESET must be valid down to 0, adding a pull-down resistor between RESET and GND removes stray leakage currents, holding RESET low VCC VCC GND MAX6337 RESET MR VCC GND RESET INPUT MOTOROLA 68HCXX µP Figure 1. Interfacing to µPs with Bidirectional Reset Pins 3 MR 3 Manual-Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for the reset timeout period (tRP) after MR goes high. Leave unconnected or connect to VCC if not used. 4 VCC 4 Supply Voltage (0.7V to 5.5V) |
Número de pieza similar - MAX6335 |
|
Descripción similar - MAX6335 |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes 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 |