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参数资料
| 型号： | MAX16039LLA23+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/21页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY BACKUP 2.32V 8-UDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.32V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN |
| 供应商设备封装： | 8-uDFN（2x2） |
| 包装： | 带卷 (TR) |
Low-Power Battery Backup
Circuits in Small μDFN Packages
Backup Battery Switchover
To preserve the contents of the RAM in a brownout or
power failure, the MAX16033–MAX16040 automatically
switch to back up the battery installed at BATT when
the following two conditions are met:
1) V CC falls below the reset threshold voltage.
2) V CC is below V BATT .
Table 1 lists the status of the inputs and outputs in bat-
tery-backup mode. The devices do not power-up if the
only voltage source is V BATT . OUT only powers up from
V CC at startup.
Table 1. Input and Output Status in
Battery-Backup Mode
V CC . This input can be driven from TTL/CMOS logic
outputs or with open-drain/collector outputs. Connect a
normally-open momentary switch from MR to GND to
create a manual-reset function; external debounce cir-
cuitry is not required. When driving MR from long
cables or when using the device in a noisy environ-
ment, connect a 0.1μF capacitor from MR to GND to
provide additional noise immunity.
Watchdog Input
(MAX16034/MAX16038 Only)
The watchdog monitors μP activity through the watch-
dog input (WDI). RESET asserts when the μP fails to
toggle WDI. Connect WDI to a bus line or μP I/O line. A
change of state (high to low, low to high, or a minimum
100ns pulse) resets the watchdog timer. If WDI remains
high or low for longer than the watchdog timeout period
PIN
V CC
OUT
BATT
RESET
BATTON
MR , RESETIN,
CE IN, and WDI
CE OUT
STATUS
Disconnected from OUT
Connected to BATT
Connected to OUT. Current drawn from the
battery is less than 1μA (at V BATT = 2.8V,
excluding I OUT ) when V CC = 0V.
Asserted
High state
Inputs ignored
Connected to OUT
(t WD ), the internal watchdog timer runs out and triggers
a reset pulse for the reset timeout period (t RP ). The
internal watchdog timer clears whenever reset is
asserted or whenever WDI sees a rising or falling edge.
If WDI remains in either a high or low state, a reset
pulse periodically asserts after every watchdog timeout
period (t WD ); see Figure 2.
WDI
PFO
Asserted
Manual-Reset Input
(MAX16033/MAX16037 Only)
t WD
RESET
t WD = WATCHDOG TIMEOUT PERIOD
t RP = RESET TIMEOUT PERIOD
t RP
t WD
t RP
Many μP-based products require manual-reset capabil-
ity, allowing the user or external logic circuitry to initiate
a reset. For the MAX16033/MAX16037, a logic-low on
MR asserts RESET . RESET remains asserted while MR
is low and for a minimum of 140ms (t RP ) after it returns
high. MR has an internal 20k ? (min) pullup resistor to
Figure 2. MAX16034/MAX16038 Watchdog Timeout Period and
Reset Active Time
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16039LLA26/GG8 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX16039LLA26+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.63V 8PIN UDFN - Rail/Tube |
| MAX16039LLA26+T | 功能描述:监控电路 Battery Backup 2.63V 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 |
| MAX16039LLA29+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.93V 8PIN UDFN - Rail/Tube |
| MAX16039LLA29+T | 功能描述:监控电路 Battery Backup 2.93V 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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