- 您现在的位置：买卖IC网 > PDF目录201423 > CAT1027YI-28-GT3 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 PDF资料下载
参数资料
| 型号： | CAT1027YI-28-GT3 |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封装： | ROHS COMPLIANT, MO-153, TSSOP-8 |
| 文件页数： | 18/20页 |
| 文件大小： | 241K |
| 代理商： | CAT1027YI-28-GT3 |
CAT1026, CAT1027
Catalyst Semiconductor, Inc.
7
Doc. No. MD-3010 Rev. M
Characteristics subject to change without notice
DEVICE OPERATION
Reset Controller Description
The CAT1026 and CAT1027 precision RESET
controllers ensure correct system operation during
brownout and power up/down conditions. They are
configured with open drain RESET outputs.
During power-up, the RESET outputs remain active
until VCC reaches the VTH threshold and will continue
driving the outputs for approximately 200ms (tPURST)
after reaching VTH. After the tPURST timeout interval, the
device will cease to drive the reset outputs. At this
point the reset outputs will be pulled up or down by
their respective pull up/down resistors.
During power-down, the RESET outputs will be active
when VCC falls below VTH. The RESET
output will be
valid so long as VCC is >1.0V (VRVALID). The device is
designed to ignore the fast negative going VCC transi-
ent pulses (glitches).
Reset output timing is shown in Figure 1.
Manual Reset Capability
The RESET
pin can operate as reset output and
manual reset input. The input is edge triggered; that
is, the RESET
input will initiate a reset timeout after
detecting a high to low transition.
When RESET
I/O is driven to the active state, the
200ms timer will begin to time the reset interval. If
external reset is shorter than 200ms, Reset outputs
will remain active at least 200ms.
Monitoring Two Voltages
The CAT1026 and CAT1027 feature a second voltage
sensor, VSENSE, which drives the open drain VLOW
output low whenever the input voltage is below 1.25V.
The auxiliary voltage monitor timing is shown in
Figure 2.
By using an external resistor divider the sense
circuitry can be set to monitor a second supply in the
system. The circuit shown in Figure 3 provides an
externally adjustable threshold voltage, VTH_ADJ to
monitor the auxiliary voltage. The low leakage current
at VSENSE allows the use of large value resistors, to
reduce the system power consumption. The VLOW
output can be externally connected to the RESET
output to generate a reset condition when either of the
supplies is invalid. In other applications, VLOW signal
can be used to interrupt the system controller for an
impending power failure notification.
Data Protection
The CAT1026 and CAT1027 devices have been desig-
ned to solve many of the data corruption issues that
have long been associated with serial EEPROMs. Data
corruption occurs when incorrect data is stored in a
memory location which is assumed to hold correct data.
Whenever the device is in a Reset condition, the
embedded EEPROM is disabled for all operations,
including write operations. If the Reset output(s) are
active, in progress communications to the EEPROM
are aborted and no new communications are allowed.
In this condition an internal write cycle to the memory
can not be started, but an in progress internal non-
volatile memory write cycle can not be aborted. An
internal write cycle initiated before the Reset condition
can be successfully finished if there is enough time
(5ms) before VCC reaches the minimum value of 2 V.
In addition, to avoid data corruption due to the loss of
power supply voltage during the memory internal write
operation, the system controller should monitor the
unregulated DC power. Using the second voltage
sensor, VSENSE, to monitor an unregulated power
supply, the CAT1026 and CAT1027 signals an impen-
ding power failure by setting VLOW low.
Watchdog Timer
The Watchdog Timer provides an independent protec-
tion for microcontrollers. During a system failure, the
CAT1027 device will provide a reset signal after a
time-out interval of 1.6 seconds for a lack of activity.
CAT1027 is designed with the Watchdog timer feature
on the WDI pin. If WDI does not toggle within 1.6
second intervals, the reset condition will be generated
on reset output. The watchdog timer is cleared by any
transition on monitored line.
As long as reset signal is asserted, the watchdog
timer will not count and will stay cleared.
相关PDF资料 |
PDF描述 |
|---|---|
| CD4051BPWRG4 | 8-CHANNEL, SGL ENDED MULTIPLEXER, PDSO16 |
| CAT1023WI-28 | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| CAT1024UA-42 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| CAT1024YA-30TE13 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| CAT1024ZD2A-28 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, DSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT1027YI-28-T3 | 制造商:ON Semiconductor 功能描述:CPU SUPERVISOR WITH 2K EEPROM - Tape and Reel |
| CAT1027YI30 | 制造商:ON Semiconductor 功能描述:CPU SUPERVISOR WITH 2K EEPROM - Rail/Tube |
| CAT1027YI-30-GT3 | 功能描述:监控电路 CPU SUP W/2K EEPROM RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| CAT1027YI-30-T3 | 制造商:ON Semiconductor 功能描述:CPU SUPERVISOR WITH 2K EEPROM - Tape and Reel |
| CAT1027YI42 | 制造商:ON Semiconductor 功能描述:CPU SUPERVISOR WITH 2K EEPROM - Rail/Tube |
发布紧急采购，3分钟左右您将得到回复。