TC1275-20ENBTR Microchip Technology, TC1275-20ENBTR Datasheet - Page 5

• Manufacturer Part Number: TC1275-20ENBTR
• Description: IC RESET MONITOR 2.55V SOT23B
• Manufacturer: Microchip Technology
• Type: Simple Reset/Power-On Resetr

Specifications of TC1275-20ENBTR

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 100 ms Minimum
• Voltage - Threshold: 2.55V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Monitored Voltage: 3.3 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.2 V
• Supply Current (typ): 20 uA
• Maximum Power Dissipation: 230 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: Yes
• Undervoltage Threshold: 2.47 V
• Overvoltage Threshold: 2.64 V
• Power-up Reset Delay (typ): 300 ms
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TC127520ENBTR

3.2
The TC1275/TC1276/TC1277 provides accurate V
monitoring and reset timing during power-up, power-
down, and brownout/sag conditions, and rejects
negative-going transients (glitches) on the power
supply line.
duration vs. maximum negative excursion (overdrive)
for glitch rejection. Any combination of duration and
overdrive that lays under the curve will not generate a
reset signal. Combinations above the curve are
detected as a brownout or power-down. Transient
immunity can be improved by adding a capacitor in
close proximity to the V
TC1277.
3.3
The TC1275 RESET output is valid to V
Below this voltage the output becomes an "open
circuit" and does not sink current. This means CMOS
logic inputs to the μP will be floating at an undeter-
mined voltage. Most digital systems are completely
shut down well above this voltage. However, in situa-
tions where RESET must be maintained valid to
V
RESET to ground to discharge stray capacitances and
hold the output low
though not critical, should be chosen such that it does
not appreciably load RESET under normal operation
(100 kΩ will be suitable for most applications). Simi-
larly, a pull-up resistor to V
TC1277 to ensure a valid high RESET for V
1.8V.
© 2007 Microchip Technology Inc.
CC
= 0V, a pull-down resistor must be connected from
V
RESET Signal Integrity During
Power-Down
CC
Figure 3-5
Transient Rejection
(Figure
shows the maximum transient
CC
pin of the TC1275/TC1276/
3-6). This resistor value,
CC
is required for the
CC
CC
= 1.2V.
below
CC
TC1275/TC1276/TC1277
FIGURE 3-5:
Duration Vs. Overdrive For Glitch Rejection At
+25°C.
FIGURE 3-6:
TO V
CC
500
400
300
200
100
0
= 0V.
1
V
CC
RESET COMPARATOR OVERDRIVE,
TC1275
V
GND
V
CC
[
10
CC
RESET
V
Maximum Transient
ENSURING RESET VALID
T
CCTP
A
Duration
- V
TC1275/6/7
CC
C
]
100
Overdrive
(mV)
100k
R1
DS21383C-page 5
V
TH
1000