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参数资料
| 型号： | SP791CN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 5/19页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP 16NSOIC |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 带卷 (TR) |
PINOUT
TOP VIEW
to select another watchdog-timeout period.
Watchdog-timeout period = 2.1 x (capacitor
value in nF) ms.
V BATT
V OUT
1
2
16 WDPO
15 RESET
Pin 9 — MR — Manual-Reset Input. This input
can be tied to an external momentary
Vcc
3
14
WDO
pushbutton switch, or to a logic gate output.
GND
4
Corporation
13
CE IN
RESET remains low as long as MR is held
BATT ON
5
12 CE OUT
low and for 200ms after MR returns high.
PFO 6
11 WDI
Pin 10 — LOWLINE — LOWLINE Output goes
PFI
SWT
7
8
10
9
LOWLINE
MR
low when V CC falls to 150mV above the re-
set threshold. The output can be used to gen-
DIP/SO
PIN ASSIGNMENTS
Pin 1 — V BATT — Backup-Battery Input. Connect
to external battery or capacitor and charging
circuit.
Pin 2 —V OUT — Output Supply Voltage. V OUT con-
nects to V CC when V CC is greater than V BATT
and V CC is above the reset threshold. When
V CC falls below V BATT and V CC is below the
reset threshold, V OUT connects to V BATT . Con-
nect a 0.1 μ F capacitor from V OUT to GND.
Pin 3 — V CC — Input Supply Voltage —
+5V input
Pin 4 — GND — Ground reference for all signals
Pin 5 — BATT ON — Battery On Output. Goes
high when V OUT switches to V BATT . Goes low
when V OUT switches to V CC . Connect the base
of a PNP through a current-limiting resistor
to BATT ON for V OUT current requirements
greater than 250mA.
Pin 6 — PFO — Power-Fail Output. This is the
output of the power-fail comparator. PFO
goes low when PFI is less than1.25V. This is
an uncommitted comparator, and has no ef-
fect on any other internal circuitry.
Pin 7 — PFI — Power-Fail Input. This is the
noninverting input to the power-fail compara-
tor. When PFI is less than 1.25V, PFO goes
low. Connect PFI to GND or V OUT when not
used.
Pin 8 — SWT — Set Watchdog-Timeout Input.
Connect this input to V OUT to select the de-
fault 1.6 sec watchdog timeout period. Con-
nect a capacitor between this input and GND
erate an NMI (nonmaskable interrupt) if the
unregulated supply is inaccessible.
Pin 11 — WDI — Watchdog Input. WDI is a three-
level input. If WDI remains either high or
low for longer than the watchdog timeout
period, WDO goes low. WDO remains low
until the next transition at WDI. Leaving
WDI unconnected disables the watchdog
function. WDI connects to an internal volt-
age divider between V OUT and GND, which
sets it to mid-supply when left unconnected.
Pin 12 — CE OUT — Chip-Enable Output.
CE OUT goes low only when CE IN is low
and V CC is above the reset threshold. If CE
IN is low when reset is asserted, CE OUT will
stay low for 15us or until CE IN goes high,
whichever occurs first.
Pin 13 — CE IN — Chip-Enable Input. The Input
to chip-enable gating circuit. Connect to
GND or V OUT if not used.
Pin 14 — WDO — Watchdog Output. WDO goes
low if WDI remains either high or low longer
than the watchdog timeout period. WDO
returns high on the next transition at WDI.
WDO remains high if WDI is unconnected.
WDO is also high when RESET is asserted.
Pin 15 — RESET — RESET Output goes low
whenever V CC falls below the reset thresh-
old. RESET will remain low for 200ms
after V CC crosses the reset threshold on
power-up.
Pin 16 — WDPO — Watchdog-Pulse Output.
Upon the absence of a transition at WDI,
WDPO will pulse low for a minimum of
1ms. WDPO precedes WDO by 70ns.
SP791DS/08
SP791 Low Power Microprocessor Supervisory with Battery Switch-Over
5
? Copyright 2000 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP791CP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP791EB | 功能描述:插座和适配器 Low Power MPU Sprvsr w/Battry Switch-Over RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x |
| SP791EK | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP791EN | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP791EN-L | 功能描述:监控电路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV 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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