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參數(shù)資料
| 型號(hào)： | LTC1727-2.5 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Direct mounting on the PCB, Crimping connection, Discrete wire connectors; HRS No: 544-0084-6 00; No. of Positions: 16; Connector Type: Wire; Contact Gender: Male; Contact Spacing (mm): 2; Terminal Pitch (mm): 2; Current Rating(Amps)(Max.): 3; Operating Temperature Range (degrees C): -30 to 85; General Description: Plug; Crimping; Direct PCB mounting; Double row |
| 中文描述： | 精密四電源監(jiān)視器6引腳SOT - 23 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 188K |
| 代理商： | LTC1727-2.5 |
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10
LTC1727/LTC1728
Override Functions (5V Versions Only)
The V
CCA
pin, if unused, can be tied to either V
CC3
or V
CC5
.
This is an obvious solution since the trip points for V
CC3
and V
CC5
will always be greater than the trip point for V
CCA
.
The V
CC5
input trip point is disabled if its voltage is equal
to the voltage on V
CC3
±
25mV and the voltage on V
CC5
is
less than 4.15V. In this manner, the LTC1727-5/
LTC1728-5 will behave as a 3.3V monitor and V
CC5
reset
capability will be disabled.
The V
CC5
trip point is reenabled when the voltage on V
CC5
is equal to the voltage on V
CC3
±
25mV and the two inputs
are greater than approximately 4.15V. In this manner, the
part can function as a 5V monitor with the 3.3V monitor
disabled.
APPLICATIU
W
U
U
Figure 3. RST Voltage vs Supply Voltage
Figure 2. Single Supply Monitor with Others Disabled
When monitoring either 3.3V or 5V with V
CC3
strapped to
V
CC5
(see Figure 2), the part determines which is the
appropriate range. The part handles this situation as
shown in Figure 3. Above 1V and below V
RT3
, RST is held
low. From V
RT3
to approximately 4.15V the part assumes
3.3V supply monitoring and RST is deasserted. Above
approximately 4.15V the part operates as a 5V monitor.
In most systems the 5V supply will pass through the 3.1V
to 4.15V region in <200ms during power-up, and the
RST output will behave as desired. Table 1 summarizes
the state of RST at various operating voltages with
V
CC3
= V
CC5
.
Table 1. Override Truth Table (V
CC3
= V
CC5
)
INPUTS (V
CC3
= V
CC5
= V
CC
)
0V
≤
V
CC
≤
1V
1V
≤
V
CC
≤
V
RT3
V
RT3
≤
V
CC
≤
4.15V
4.15V
≤
V
CC
≤
V
RT5
V
RT5
≤
V
CC
RST
—
0
1
0
1
V
CC3
V
CC5
V
CCA
GND
1
5
4
3
2
RST
LTC1728-5
1727/28 F02
TO SYSTEM
RESET
R1
10k
V
CC
3.3V OR 5V
SUPPLY VOLTAGE (V)
0
R
3
4
5
4
1727/28 F03
2
1
0
1
2
3
5
V
CC3
= V
CC5
= V
CCA
= 0V TO 5V
10k PULL-UP FROM RST TO V
CC3
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