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參數(shù)資料
| 型號： | CAT25C04X |
| 英文描述： | Supervisory Circuits with SPI Serial E2PROM, Precision Reset Controller and Watchdog Timer |
| 中文描述： | 監(jiān)控電路具有SPI串行E2PROM，精密復(fù)位控制器和看門狗定時(shí)器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 160K |
| 代理商： | CAT25C04X |
9-104
CAT25CXXX
Stock No. 21085-01 4/98
Advanced
DEVICE OPERATION FOR THE
SUPERVISORY CIRCUIT
Reset Controller Description
The CAT25CXXX provides a precision RESET control-
ler that ensures correct system operation during brown-
out and power-up/down conditions. It is configured
with open drain RESET outputs. During power-up, the
RESET outputs remain active until V
CC
reaches the
V
TH
threshold and will continue driving the outputs for
approximately 200ms (t
PURST
) after reaching V
TH.
After
the t
PURST
timeout interval, the device will cease to drive
reset outputs. At this point the reset outputs will be
pulled up or down by their respective pull up/pull down
devices. During power-down, the RESET outputs will
begin driving active when V
CC
falls below V
TH.
The
RESET outputs will be valid so long as V
CC
is >1.0V
(V
RVALID
).
The RESET pins are I/Os; therefore, the CAT25CXXX
can act as a signal conditioning circuit for an externally
applied reset. The inputs are level triggered; that is, the
RESET input in the 25CXXX will initiate a reset timeout
after detecting a high and the
RESET
input in the
25CXXX will initiate a reset timeout after detecting a low.
Watchdog Timer
The Watchdog Timer provides an independent protec-
tion for microcontrollers. During a system failure, the
CAT25CXXX will respond with a reset signal after a
time out period (the time out period is defined by the
watchdog timer bits WD0 an d WD1) for lack of activity.
25CXXX is designed with the Watchdog Timer feature
on the
CS
input. For the 25CXXX, if the microcontroller
does not toggle the
CS
pin within the time out period the
Watchdog Timer times out. This will generate a reset
condition on reset outputs. The Watchdog Timer is
cleared by any transition on
CS
.
As long as the reset signal is asserted, the Watchdog
Timer will not count and will stay cleared.
Reset Threshold Voltage
From the factory the 25CXXX is offered in six different
variations of reset threshold voltages. They are 4.50-
4.75V, 4.25-4.50V, 3.00-3.15V, 2.85-3.00V, 2.55-2.70V
and 1.7-1.8V. To provide added flexibility to design
engineers using this product, the 25CXXX is designed
with an additional feature of programming the reset
threshold voltage. This allows the user to change the
existing reset threshold voltage to one of the other five
reset threshold voltages. Once the reset threshold
voltage is selected it will not change even after cycling
the power, unless the user uses the programmer to
change the reset threshold voltage. However, the
programming function is available only through third
party programmer manufacturers. Please call Catalyst
for a list of programmer manufacturers who support this
function.
Figure 8. Page Write Instruction Timing
SK
SI
CS
SO
0
0
0
0
0
0
1
0
ADDRESS
Data
Byte 1
0
1
2
3
4
5
6
7
8
21
22
23 24-31
32-39
Data
Byte 2
Data
Byte 3
Data
Byte N
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT25C04Y | 功能描述:電可擦除可編程只讀存儲器 (512x8) 4K 2.5-6.0 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT25C04Y-1.8 | 功能描述:電可擦除可編程只讀存儲器 (512x8) 4K 1.8-6.0 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT25C04YA | 功能描述:電可擦除可編程只讀存儲器 (512x8) 4K 2.5-6.0 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT25C04YI | 功能描述:電可擦除可編程只讀存儲器 (512x8) 4K 2.5-6.0 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT25C05L | 功能描述:電可擦除可編程只讀存儲器 (512x8) 4K 2.5-6.0 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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