参数资料
型号: TC1271ASVRCTR
厂商: Microchip Technology
文件页数: 22/48页
文件大小: 0K
描述: IC RESET MONITOR 2.93V SOT143-4
标准包装: 3,000
类型: 简单复位/加电复位
监视电压数目: 1
输出: 推挽式,图腾柱
复位: 高有效
复位超时: 最小为 140 ms
电压 - 阀值: 2.93V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: TO-253-4,TO-253AA
供应商设备封装: SOT-143
包装: 带卷 (TR)
TC1270A/70AN/71A
4.2.3
POWER-DOWN/BROWN-OUT
Figure 4-8 shows the waveform of the RST pin as
As the device powers-down/browns-out, the V DD falls
from a voltage above the devices trip point (V TRIP ). The
device will trip at a voltage between the maximum trip
point (V TRIP(MAX) ) and the minimum trip point
(V TRIP(MIN) ). Once the device voltage (V DD ) goes
below this voltage, the RST/RST pin will be forced to
the active state. Table 4-3 shows the state of the RST
or RST pins.
determined by the V DD voltage. As the V DD voltage falls
from the normal operating point, the device “enters”
Reset by crossing the V TRIP voltage (between
V TRIP(MAX) and V TRIP(MIN) ). Then, when V DD voltage
rises, the device “exits” Reset by crossing the V TRIP
voltage (below, or at, V TRIP(MAX) ). After the “exit” state
has been detected, the Reset Delay Timer (t RST ) starts.
When the t RST time completes, the Reset pin is driven
inactive.
TABLE 4-3:
RESET PIN STATES
State of RST Pin when:
State of RST Pin when:
Device
TC1270A
TC1271A
V DD < V TRIP
L
V DD > V TRIP( 1 )
H
V DD < V TRIP
H
V DD > V TRIP( 1 )
L
Output Driver
Push-Pull
Push-Pull
Note 1:
The RST/RST pin will be driven inactive after the Reset Delay Timer (t RST ) times out.
V DD
V TRIP
V TRIP
(with V DD Rising)
(with V DD Falling)
1V
RST (1)
t RD
< 1V is outside the
device specifications
t RST
t RD
t RST
Note 1:
FIGURE 4-8:
The TC1270AN requires an external pull-up resistor.
RST Operation as determined by the V TRIP .
DS22035D-page 22
? 2007-2011 Microchip Technology Inc.
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