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參數(shù)資料
| 型號： | DS1238A |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | MicroManager(微管理器芯片) |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16 |
| 封裝： | 0.300 INCH, DIP-16 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大?。?/td> | 159K |
| 代理商： | DS1238A |
DS1238A
MicroManager
DS1238A
022698 1/13
FEATURES
Holds microprocessor in check during power
transients
Halts and restarts an out-of-control microprocessor
Warns microprocessor of an impending power failure
Converts CMOS SRAM into nonvolatile memory
Unconditionally write protects memory when power
supply is out of tolerance
Delays write protection until completion of the current
memory cycle
Consumes less than 200 nA of battery current
Controls external power switch for high current
applications
Debounces pushbutton reset
Accurate 10% power supply monitoring
Optional 5% power supply monitoring designated
DS1238A-5
Provides orderly shutdown in microprocessor appli-
cations
Pin-for-pin compatible with MAX691
Standard 16-pin DIP or space-saving 16-pin SOIC
Optional industrial temperature range -40
°
C to +85
°
C
PIN ASSIGNMENT
VBAT
VCCO
VCC
GND
PF
OSCIN
OSCSEL
RST
IN
RST
RVT
WDS
CEI
CEO
ST
NMI
16-Pin DIP (300 Mil.)
See Mech. Drawings
Section
PIN DESCRIPTION
V
BAT
V
CCO
V
CC
GND
PF
RVT
OSCIN
OSCSEL
IN
NMI
ST
CEO
CEI
WDS
RST
RST
1
11
10
12
13
14
2
3
4
5
6
7
8
9
15
16
VBAT
VCCO
VCC
GND
PF
RST
RST
WDS
CEI
CEO
ST
NMI
IN
16-Pin SOIC (300 Mil.)
See Mech. Drawings
Section
RVT
OSCIN
OSCSEL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
– +3 Volt Battery Input
– Switched SRAM Supply Output
– +5 Volt Power Supply Input
– Ground
– Power Fail
– Reset Voltage Threshold
– Oscillator In
– Oscillator Select
– Early Warning Input
– Non–Maskable Interrupt
– Strobe Input
– Chip Enable Output
– Chip Enable Input
– Watchdog Status
– Reset Output (active low)
– Reset Output (active high)
DESCRIPTION
The DS1238A MicroManager provides all the neces-
sary functions for power supply monitoring, reset con-
trol, and memory backup in microprocessor-based sys-
tems. A precise internal voltage reference and
comparator circuit monitor power supply status. When
an out-of-tolerance condition occurs, the microproces-
sor reset and power fail outputs are forced active, and
static RAM control unconditionally write protects exter-
nal memory. The DS1238A also provides early warning
detection of a user-defined threshold by driving a non-
maskable interrupt. External reset control is provided
by a pushbutton reset debounce circuit connected to the
RST 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 in-
ternal 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1238 | MicroManager(微管理器芯片) |
| DS1239 | MicroManager Chip(微管理器芯片) |
| DS1250AB | 4096K Nonvolatile SRAM(4096K 非易失性靜態(tài)RAM) |
| DS1250Y | 4096K Nonvolatile SRAM(4096K 非易失性靜態(tài)RAM) |
| DS1250W | 3.3V 4096K Nonvolatile SRAM(3.3V 4096K 非易失性靜態(tài)RAM) |
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 |
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