- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379178 > DS1238A CAP 3.0UF 250VAC METALLIZED POLY PDF資料下載
參數(shù)資料
| 型號： | DS1238A |
| 英文描述： | CAP 3.0UF 250VAC METALLIZED POLY |
| 中文描述： | 微管理器芯片 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 211K |
| 代理商： | DS1238A |
DS1238A
2 of 13
debounce circuit connected to the
pin. An internal watchdog timer can also force the reset outputs to
the active state if the strobe input is not driven low prior to watchdog timeout. Oscillator control pins
OSCSEL and OSCIN provide either external or internal clock timing for both the reset pulse width and
the watchdog timeout period. The Watchdog Status and Reset Voltage Threshold are provided via
WDS
and
RVT
, respectively. A block diagram of the DS1238A is shown in NO TAG.
PIN DESCRIPTION
PIN NAME
V
BAT
V
CCO
V
CC
PF
DESCRIPTION
+3V battery input provides nonvolatile operation of control functions.
V
CC
output for nonvolatile SRAM applications.
+5V primary power input.
Power-fail indicator, active high, used for external power switching as shown in NO
TAG.
Reset Voltage Threshold. Indicates that V
CC
is below the reset voltage threshold.
Oscillator input or timing capacitor. See NO TAG.
Oscillator Select. Selects internal or external clock functions. See NO TAG.
Early warning power-fail input. This voltage sense point can be tied (via resistor
divider) to a user-selected voltage.
Non-maskable interrupt. Used in conjunction with the IN pin to indicate an impending
power failure.
Strobe input. A high-to-low transition will reset the watchdog timer, indicating that
software is still in control.
Chip enable output. Used with nonvolatile SRAM applications.
Chip enable input.
Watchdog Status. Indicates that a watchdog timeout has occurred.
Active low reset output.
Active high reset output.
RVT
OSCIN
OSCSEL
IN
NMI
ST
CEO
CEI
WDS
RST
RST
POWER MONITOR
The DS1238A employs a bandgap voltage reference and a precision comparator to monitor the 5-volt
supply (V
CC
) in microprocessor-based systems. When an out-of-tolerance condition occurs, the
RVT
,
RST, and
RST
outputs are driven to the active state. The V
CC
trip point (V
CCTP
) is set for 10% operation
so that the
RVT
, RST and
RST
outputs will become active as V
CC
falls below 4.5 volts (4.37 typical).
The V
CCTP
for the 5% operation option (DS1238A-5) is set for 4.75 volts (4.62 typical). The RST and
RST
signals are excellent for microprocessor reset control, as processing is stopped at the last possible
moment of in-tolerance V
CC
. On power-up,
RVT
will become inactive as soon as V
CC
rises above V
CCTP
.
However, the RST and
RST
signals remain active for a minimum of 50 ms (100 ms typical) after V
CCTP
is
reached to allow the power supply and microprocessor to stabilize.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1245ABP-70-IND | GT 31C 1#4,2#8,14#12,14#16 SKT |
| DS1245ABP-85-IND | GT 24C 24#16 PIN PLUG |
| DS1245YP-100-IND | CAT5E PATCH CORD 10 FOOT BEIGE |
| DS1245YP-120-IND | CAT5E PATCH CORD 15 FOOT BEIGE |
| DS1245YP-70-IND | CAT5E PATCH CORD 50 FOOT BEIGE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1238A-10 | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1238A-10+ | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1238A10N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DS1238A-10N | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1238A-10N+ | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。