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参数资料
| 型号： | LTC1326CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC PREC TRPL SUPPLY MONITR 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 3.118V，4.725V，可调 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
LTC1326/LTC1326-2.5
APPLICATIO S I FOR ATIO
Duringasupplyinducedresetcondition,theabilityofthe
PBR pin to force a soft reset condition on the SRST pin
is disabled. In other words SRST will remain high. If the
PBR pin is held low, both during and after a supply
induced reset (low RST), the RST pin will remain low until
200ms after the PBR goes high.
Power Detect/Gate Drive
The LTC1326/LTC1326-2.5 for the most part are powered
internally from the V CC3 pin. The exception is at the gate
appropriate range. The LTC1326 handles this situation as
shown in Figure 2. Above 1V and below V RT3 , RST is held
low. From V RT3 to approximately 4.15V, the LTC1326
assumes 3.3V supply monitoring and RST is deasserted.
Above approximately 4.15V, the LTC1326 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 and RST at various operating voltages
with V CC3 = V CC5 .
drive of the output FET on the RST pin. On the input to this
FET is power detection circuitry used to detect and drive
the gate from either the 3.3V input pin (V CC3 ) or the 5V
input pin (V CC5 ) on the LTC1326 or the 2.5V input pin
(V CC25 ) on the LTC1326-2.5. The gate drive is derived
from the pin with the highest potential. This ensures the
Table 1. Override Truth Table (V CC3 = V CC5 )
INPUTS (V CC3 = V CC5 = V CC ) RST
0V ≤ V CC ≤ 1V —
1V ≤ V CC ≤ V RT3 0
V RT3 ≤ V CC ≤ 4.15V 1
RST
—
1
0
part pulls the RST pin low as soon as either input pin is
≥ 1V.
Dual and Single Supply Monitor Operation
4.15V ≤ V CC ≤ V RT5
V RT5 ≤ V CC
3.3V OR
5V
LTC1326
0
1
1
0
The V CC3 , V CC5 and V CCA inputs may be individually
disabled by the following override techniques which allow
the LTC1326 or LTC1326-2.5 to be used as a dual or single
supply monitor.
ADJUSTABLE
SUPPLY
R1
R2
1
2
3
4
V CC3
V CC5
V CCA
GND
PBR
SRST
RST
RST
8
7
6
5
4.7k
SYSTEM RESET
LTC1326 Override Functions
1326 /2.5 F01
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 .
5
Figure 1
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 part will behave as a
3.3V monitor and the V CC5 reset 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
LTC1326 can function as a 5V monitor with the 3.3V
4
3
2
1
V CC3 = V CC5 = V CCA = 0V TO 5V
4.7k PULL-UP FROM RST TO V CC3
monitor disabled.
0
0
1
2
3
4
5
When monitoring either 3.3V or 5V with V CC3 strapped to
V CC5 (see Figure 1), the LTC1326 determines which is the
SUPPLY VOLTAGE (V)
1326 /2.5 F02
Figure 2. RST Voltage vs Supply Voltage
132625fc
9
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