TC1276-20ENBTR Microchip Technology, TC1276-20ENBTR Datasheet - Page 5
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TC1276-20ENBTR
Manufacturer Part Number
TC1276-20ENBTR
Description
IC RESET MONITOR 2.55V SOT23B
Manufacturer
Microchip Technology
Type
Simple Reset/Power-On Resetr
Datasheet
1.TC1275-10ENBTR.pdf
(12 pages)
Specifications of TC1276-20ENBTR
Number Of Voltages Monitored
1
Output
Open Drain or Open Collector
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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
TC127620ENBTR
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