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参数资料
| 型号： | CAT1024ZD4I-42-T2 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, DSO8 |
| 封装： | 3 X 3 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, TDFN-8 |
| 文件页数： | 18/20页 |
| 文件大小： | 228K |
| 代理商： | CAT1024ZD4I-42-T2 |
CAT1024, CAT1025
Catalyst Semiconductor, Inc.
7
Doc. No. MD-3008 Rev. O
Characteristics subject to change without notice
DEVICE OPERATION
Reset Controller Description
The CAT1024/25 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 Operation
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.
The CAT1024/25 also have a separate manual reset
input. Driving the MR
input low by connecting a
pushbutton (normally open) from MR
pin to GND will
generate a reset condition. The input has an internal
pull up resistor.
Reset remains asserted while MR
is low and for the
Reset Timeout period after MR
input has gone high.
Glitches shorter than 100ns on MR
input will not ge-
nerate a reset pulse. No external debouncing circuits
are required. Manual reset operation using MR
input
is shown in Figure 2.
Hardware Data Protection
The CAT1024/25 supervisors have been designed 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 2V.
In addition, the CAT1025 includes a Write Protection
Input which when tied to VCC will disable any write
operations to the device.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT1024ZD4I-42T3 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM and Manual Reset |
| CAT1024ZD4I-42TE13 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM and Manual Reset |
| CAT1024ZD4I-45 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM and Manual Reset |
| CAT1024ZD4I-45-GT2 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM and Manual Reset |
| CAT1024ZD4I-45-GT3 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM and Manual Reset |
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