参数资料
型号: TC1271ALCVCTTR
厂商: Microchip Technology
文件页数: 20/48页
文件大小: 0K
描述: IC RESET MONITOR 4.63V SOT23A-5
标准包装: 1
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 17.5 ms
电压 - 阀值: 4.63V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
供应商设备封装: SOT-23-5
包装: 标准包装
产品目录页面: 662 (CN2011-ZH PDF)
其它名称: TC1271ALCVCTDKR
TC1270A/70AN/71A
4.2
Voltage Detect Circuit
V DD
The voltage detect circuit monitors V DD . The device’s
MR
+
Comparator
Reference
Voltage
Noise Filter
Output
Driver
(Push-
Pull)
Delay
RST
Reset voltage trip point (V TRIP ) is selected when the
device is ordered. The voltage on the device’s V DD pin
determines the output state of the RST/RST pin.
V DD voltages above the V TRIP(MAX) force the RST/RST
pin inactive. V DD voltages below the V TRIP(MIN) force
the RST/RST pin active. The state of the RST/RST pin
is unknown for V DD voltages between V TRIP(MAX) and
V TRIP(MIN) . This is shown in Table 4-1
TABLE 4-1:
V DD LEVELS TO RST/RST
FIGURE 4-4:
TC1270A Block Diagram.
OUTPUT STATES
Output State
V DD
V DD Voltage Level
RST
RST
+
Comparator
Reference
Output
Driver
(Open-
Drain)
RST
V DD ? V TRIP(MAX)
V TRIP(MIN) < V DD < V TRIP(MAX)
V DD ? V TRIP(MIN)
H ( 1, 2 )
U
L
L ( 1 )
U
H
Voltage
Delay
Legend: H = Driven High L = Driven Low
U = Unknown, driven either High or Low
MR
Noise Filter
V SS
Note 1:
2:
The RST/RST pin will be driven inactive
after the Reset Delay Timer (t RST ) times
out.
The TC1270AN RST pin will be floated
FIGURE 4-5:
TC1270AN Block Diagram.
V DD
after the Reset Delay Timer (t RST ) times
out.
The term V TRIP will be used as the general term for the
trip point voltage where the device actually trips.
MR
+
Comparator
Reference
Voltage
Noise Filter
Output
Driver
(Push-
Pull)
Delay
RST
In the case where V DD is falling (for voltages starting
above V TRIP(MAX) ):
? Voltages above V TRIP(MAX) will never cause the
RST/RST output pin to be driven active.
? Voltages below V TRIP(MIN) will always cause the
RST/RST output pin to be driven active.
In the case where V DD is rising (for voltages starting
below V TRIP(MIN) ):
? Voltages above V TRIP(MAX) will always cause the
FIGURE 4-6:
DS22035D-page 20
TC1271A Block Diagram.
RST/RST output pin to be driven inactive, (or
floated, in the TC1270AN) after the Reset Delay
Timer (t RST ), times out.
? 2007-2011 Microchip Technology Inc.
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