MAX6314US39D3-T Maxim Integrated, MAX6314US39D3-T Datasheet - Page 6

• Manufacturer Part Number: MAX6314US39D3-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6314r

Specifications of MAX6314US39D3-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 1 V to 5.5 V
• Undervoltage Threshold: 3.83 V
• Overvoltage Threshold: 3.97 V
• Output Type: Active Low, Bidirectional
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 280 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-143
• Chip Enable Signals: No
• Maximum Power Dissipation: 320 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 5 uA
• Supply Voltage - Min: 1 V

MR has an internal 63kΩ pullup resistor, so it can be
left open if not used. Connect a normally open momen-
tary switch from MR to GND to create a manual reset
function; 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.
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
transients (glitches). The Typical Operating Character-
istics show the Maximum Transient Duration vs. Reset
Threshold Overdrive, for which reset pulses are not
generated. The graph was produced using negative-
going pulses, starting at V
the programmed reset threshold by the magnitude
indicated (reset threshold overdrive). The graph shows
the maximum pulse width that a negative-going V
transient may typically have without causing a reset
pulse to be issued. As the amplitude of the transient
increases (i.e., goes farther below the reset threshold),
the maximum allowable pulse width decreases. A 0.1µF
bypass capacitor mounted close to V
tional transient immunity.
68HC11/Bidirectional-Compatible
µP Reset Circuit
Figure 2. MAX6314 Supports Additional Devices on the Reset Bus
6
__________Applications Information
_______________________________________________________________________________________
MR
Negative-Going V
MAX6314
CIRCUITRY
RESET
V
CC
RST
max and ending below
4.7kΩ
CC
CC
provides addi-
C
Transients
IN
RESET
CC
C
STRAY
When V
current—it becomes an open circuit. Therefore, high-
impedance CMOS-logic inputs connected to RESET
can drift to undetermined voltages. This presents no
problem in most applications, since most µP and other
circuitry is inoperative with V
applications where RESET must be valid down to
V
cause any stray leakage currents to flow to ground,
holding RESET low (Figure 3). R1’s value is not critical;
100kΩ is large enough not to load RESET and small
enough to pull RESET to ground.
Figure 3. RESET Valid to V
RESET
RESET
CC
= 0V, adding a pull-down resistor to RESET will
CC
C
falls below 1V, RESET no longer sinks
IN
C
IN
Ensuring a Valid
68HC11
V
MAX6314
CC
OTHER DEVICES
GND
V
CC
CC
CIRCUITRY
RESET
= Ground Circuit
RESET
CC
Down to V
below 1V. However, in
R1
RESET Output
CC
= 0V