參數(shù)資料
型號(hào)： TC1271ARVCTTR
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
封裝： LEAD FREE, PLASTIC, SOT-23, 5 PIN
文件頁(yè)數(shù)： 13/48頁(yè)
文件大?。?/td> 541K
代理商： TC1271ARVCTTR
TC1270A/70AN/71A
DS22035D-page 20
2007-2011 Microchip Technology Inc.
FIGURE 4-4:
TC1270A Block Diagram.
FIGURE 4-5:
TC1270AN Block Diagram.
FIGURE 4-6:
TC1271A Block Diagram.
4.2
Voltage Detect Circuit
The voltage detect circuit monitors VDD. The device’s
Reset voltage trip point (VTRIP) is selected when the
device is ordered. The voltage on the device’s VDD pin
determines the output state of the RST/RST pin.
VDD voltages above the VTRIP(MAX) force the RST/RST
pin inactive. VDD voltages below the VTRIP(MIN) force
the RST/RST pin active. The state of the RST/RST pin
is unknown for VDD voltages between VTRIP(MAX) and
VTRIP(MIN). This is shown in Table 4-1
TABLE 4-1:
VDD LEVELS TO RST/RST
OUTPUT STATES
The term VTRIP will be used as the general term for the
trip point voltage where the device actually trips.
In the case where VDD is falling (for voltages starting
above VTRIP(MAX)):
Voltages above VTRIP(MAX) will never cause the
RST/RST output pin to be driven active.
Voltages below VTRIP(MIN) will always cause the
RST/RST output pin to be driven active.
In the case where VDD is rising (for voltages starting
below VTRIP(MIN)):
Voltages above VTRIP(MAX) will always cause the
RST/RST output pin to be driven inactive, (or
floated, in the TC1270AN) after the Reset Delay
Timer (tRST), times out.
VDD
Comparator
+
–
Output
Driver
RST
Reference
Noise Filter
MR
Voltage
Delay
(Push-
Pull)
VDD
Comparator
+
–
RST
Reference
VSS
Noise Filter
MR
Voltage
Delay
Output
Driver
(Open-
Drain)
VDD
Comparator
+
–
RST
Reference
Noise Filter
MR
Voltage
Delay
Output
Driver
(Push-
Pull)
VDD Voltage Level
Output State
RST
VDD VTRIP(MAX)
H(1, 2)
L(1)
VTRIP(MIN) < VDD < VTRIP(MAX)
UU
VDD VTRIP(MIN)
LH
Legend: H = Driven High
L = Driven Low
U = Unknown, driven either High or Low
Note 1:
The RST/RST pin will be driven inactive
after the Reset Delay Timer (tRST) times
out.
2:
The TC1270AN RST pin will be floated
after the Reset Delay Timer (tRST) times
out.
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TC1271ASBVCTTR 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input
TC1271ASBVRCTR 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input
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TC1271ASCVRCTR 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input
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