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参数资料
| 型号： | DS1238 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | 电源管理 |
| 英文描述： | MicroManager(微管理器芯片) |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16 |
| 封装： | 0.300 INCH, DIP-16 |
| 文件页数： | 1/13页 |
| 文件大小： | 167K |
| 代理商： | DS1238 |
DS1238
MicroManager
DS1238
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
DS1238-5
Provides orderly shutdown ini mcroprocessor 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 DS1238 MicroManager provides all the necessary
functions for power supply monitoring, reset control,
and memory backup in microprocessor-based systems.
A precise internal voltage reference and comparator cir-
cuit monitor power supply status. When an out-of-toler-
ance condition occurs, the microprocessor reset and
power fail outputs are forced active, and static RAM
control unconditionally write protects external memory.
The DS1238 also provides early warning detection of a
user-defined threshold by driving a non-maskable inter-
rupt. External reset control is provided by a pushbutton
reset debounce circuit connected to the RST pin. An in-
ternal 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 tim-
ing for both the reset pulse width and the watchdog time-
out period. The Watchdog Status and Reset Voltage
Threshold are provided via WDS and RVT, respectively.
A block diagram of the DS1238 is shown in Figure 1.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1239 | MicroManager Chip(微管理器芯片) |
| DS1250AB | 4096K Nonvolatile SRAM(4096K 非易失性静态RAM) |
| DS1250Y | 4096K Nonvolatile SRAM(4096K 非易失性静态RAM) |
| DS1250W | 3.3V 4096K Nonvolatile SRAM(3.3V 4096K 非易失性静态RAM) |
| DS1251Y | 4096K NV SRAM with Phantom Clock(带幻影时钟的4096K NV 静态RAM) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1238-10 | 功能描述:监控电路 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 |
| DS1238-10+ | 功能描述:监控电路 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 |
| DS1238-10N | 功能描述:监控电路 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 |
| DS1238-10N+ | 功能描述:监控电路 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 |
| DS1238-5 | 功能描述:监控电路 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 |
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