参数资料
型号: CAT885ZI-SA-GT3
厂商: ON Semiconductor
文件页数: 4/8页
文件大小: 0K
描述: IC SUPERVSR 5CH 2.87/1.68V 8MSOP
标准包装: 1
类型: 多压监控器
监视电压数目: 5
输出: 开路漏极或开路集电极
复位: 低有效
复位超时: 最小为 70 ms
电压 - 阀值: 1.68V,2.87V,可调,可调,可调
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 标准包装
其它名称: CAT885ZI-SA-GT3DKR
CAT885
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Conditions
Min
Typ.
Max
Units
Reset
V OL
t RPD
Reset Output Voltage Low
V TH to Reset Asserted Delay
V DD ≥ 3.3V, Sinking 2.5mA
V DD < 3.3V, Sinking 1.5mA
1
0.05
0.05
6
0.40
0.40
V
V
μs
t PD
C LOAD
POR Timeout Delay
Load Capacitance on Reset Pin
70
120
5
240
ms
pF
Manual Reset
V THL
V THH
T PW
MR
MR
ˉˉˉ Input Voltage Low
ˉˉˉ Input Voltage High
MR
ˉˉˉ Minimum Pulse Width
V DD - 0.6
1
0.8
V
V
μs
R IN
Internal Pull-Up Resistor
8
16
k ?
OPERATION
The CAT885 is designed to monitor critical supply
voltages in line driven and battery powered
microprocessor systems, providing Supply Voltage
Supervision, Power On Reset control and Manual
Reset Assertion. These features along with excellent
threshold accuracy and low power consumption make
the CAT885 device suitable for a wide variety of
applications needing multi-voltage monitoring.
During normal operation, the CAT885 monitors the
voltage levels of V DD , V2MON, V3MON, V4MON, and
V5MON. If the voltage on any of these five inputs falls
CAT885 allows users to adjust the minimum voltage
sense level for three of the five monitored voltages.
For example, the user can adjust the voltage input trip
point for V 3MON , V 4MON and V 5MON inputs. This is done
by connecting an external resistor divider network to
the V xMON pin in order to set the trip point to a voltage
above 600mV. Resistors R 1 and R 2 in Figure 1 are
selected by the formula: V TRIP = 0.6V x (R 1 + R 2 ) / R 2 .
VDD
ˉˉˉˉ
below their respective voltage trip points, a reset is
asserted (RST = low) to prevent the microprocessor
from operating during a power failure or brownout
V2MON
CAT885
condition. This reset signal remains low until the
voltages exceeds the voltage threshold settings for
R 1
VxMON
the reset time delay period t PD .
R 2
GND
Figure 1. CAT885 Programming Trip Voltage
Doc. No. MD-3028 Rev. C
4
? 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
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