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参数资料
| 型号： | SP809EK-L-4-6/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC MPU RESET CIRC 4.6V SOT23-3 |
| 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： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.6V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 其它名称： | 1016-1601-6 |
S P 8 0 9 / S P 8 1 0
3 P i n M i c r o p r o c e s s o r S u p e r v i s o r C i r c u i t
THEORY OF OPERATION
μ P will be activated at a valid reset state.
These μ P supervisory circuits assert reset to
prevent code execution errors during power-
up, power-down, or brownout conditions.
Reset is guaranteed to be a logic low for
V TH >V CC >0.9V. Once V CC exceeded the reset
threshold, an internal timer keeps RESET low
for the reset timeout period; after this interval,
RESET goes high.
If a brownout condition occurs (V CC drops
below the reset threshold), RESET goes low.
Any time V CC goes below the reset threshold,
the internal timer resets to zero, and RESET
goes low. The internal timer is activated after
APPLICATION INFORMATION
N EGATIVE G OING V CC T RANSIENTS
In addition to issuing a reset to the μP during
power-up, power-down, and brownout
conditions, SP809 series are relatively
resistant to short-duration negative-going V CC
transient.
E NSURING A V ALID R ESET O UTPUT D OWN
TO V CC =0
When V CC falls below 0.9V, SP809 RESET
output no longer sinks current; it becomes an
open circuit. In this case, high-impedance
CMOS logic inputs connecting to RESET can
drift to undetermined voltages. Therefore,
SP809/810 with CMOS is perfect for most
applications of V CC down to 0.9V.
However in applications where RESET must be
valid down to 0V, adding a pull-down resistor
to RESET causes any leakage currents to flow
to ground, holding RESET low.
V CC returns above the reset threshold, and
RESET remains low for the reset timeout
period.
B ENEFIT OF H IGHLY A CCURATE R ESET
T HRESHOLD
SP809/810 with specified voltage as 5V±10%
or 3V±10% are ideal for systems using a
5V±5% or 3V±5% power supply. The reset is
guaranteed to assert after the power supply
falls below the minimum specified operating
voltage range of the system ICs. The pre-
trimmed thresholds are reducing the range
over which an undesirable reset may occur.
I NTERFACING TO μ P WITH B IDIRECTIONAL
R ESET P INS
The RESET output on the SP809N is open
drain, this device interfaces easily with μ Ps
that have bidirectional reset pins. Connecting
the μ P supervisor's RESET output directly to
the microcontroller's RESET pin with a single
pull-up resistor allows either device to assert
reset.
T EST C IRCUIT
Fig. 10: Test Circuit
? 2011 Exar Corporation
6/8
Rev. 2.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP809N | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3 Pin Microprocessor Supervisor Circuit |
| SP809NEK-2.3 | 制造商:Exar Corporation 功能描述:Voltage Detector |
| SP809NEK-2.6 | 制造商:Exar Corporation 功能描述:Voltage Detector |
| SP809NEK-2-3 | 制造商:Exar Corporation 功能描述: |
| SP809NEK-2-3/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3 Pin Microprocessor Supervisor Circuit |
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