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| 型号： | MAX6363PUT26+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP SOT23-6 |
| 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： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 150 ms |
| 电压 - 阀值： | 2.63V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 带卷 (TR) |
SOT23, Low-Power μP Supervisory Circuits
with Battery Backup
Detailed Description
The Typical Operating Circuit shows a typical connection
for the MAX6361–MAX6364 family. OUT powers the stat-
ic random-access memory (SRAM). OUT is internally
connected to V CC if V CC is greater than the reset thresh-
old, or to the greater of V CC or V BATT when V CC is less
than the reset threshold. OUT can supply up to 150mA
from V CC . When V CC is higher than V BATT , the BATT ON
(MAX6363) output is low. When V CC is lower than V BATT ,
an internal MOSFET connects the backup battery to
OUT. The on-resistance of the MOSFET is a function of
backup-battery voltage and is shown in the Battery to
Out On-Resistance vs. Temperature graph in the Typical
Operating Characteristics section.
Backup-Battery Switchover
In a brownout or power failure, it may be necessary to
preserve the contents of the RAM. With a backup bat-
tery installed at BATT, the MAX6361–MAX6364 auto-
matically switch the RAM to backup power when V CC
falls. The MAX6363 has a BATT ON output that goes
high when in battery-backup mode. These devices
(high to low or low to high) within the watchdog timeout
period (t WD ) with a 100ns minimum pulse width clears
the watchdog timer. If WDI remains high or low for longer
than the watchdog timeout period, the internal watchdog
timer runs out and a reset pulse is triggered for the reset
timeout period (t RP ). The internal watchdog timer clears
whenever reset asserts or the WDI sees a rising or falling
edge within the watchdog timeout period. If WDI remains
in a high or low state for an extended period of time, a
reset pulse asserts after every watchdog timeout period
(t WD ) (Figure 1).
Reset In (MAX6364 Only)
RESET IN is compared to an internal 1.235V reference.
If the voltage at RESET IN is less than 1.235V, reset is
asserted. The RESET IN comparator may be used as
an undervoltage detector to signal a failing power sup-
ply. It can also be used as a secondary power-supply
reset monitor.
To program the reset threshold (V RTH ) of the secondary
power supply, use the following equation (see Typical
Operating Circuit):
= V
? R 2
+ 1 ?
require two conditions before switching to battery-
backup mode:
1) V CC must be below the reset threshold.
? R1
V RTH REF ?
?
?
2) V CC must be below V BATT .
Table 1 lists the status of the inputs and outputs in bat-
where V REF = 1.235V. To simplify the resistor selection,
[ ( V RTH REF ) ? 1 ]
tery-backup mode. The device will not power up if the
only voltage source is on BATT. OUT will only power up
from V CC at startup.
R 1 = R 2
/ V
Manual Reset Input (MAX6361 Only)
Many μP-based products require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. For the MAX6361, a logic
low on MR asserts reset. Reset remains asserted while
MR is low, and for a minimum of 150ms (t RP ) after it
returns high. MR has an internal 20k ? pull-up resistor to
choose a value for R2 and calculate R1:
Since the input current at RESET IN is 25nA (max), large
values (up to 1M ? ) can be used for R2 with no signifi-
cant loss in accuracy. For example, in the Typical
Table 1. Input and Output Status in
V CC . This input can be driven with TTL/CMOS logic lev-
els or with open-drain/collector outputs. Connect a nor-
mally open momentary switch from MR to GND to create
Battery-Backup Mode
PIN
STATUS
a manual reset function; external debounce circuitry is
not required. If MR is driven from long cables or the
device is used in a noisy environment, connect a 0.1μF
capacitor from MR to GND to provide additional noise
immunity.
Watchdog Input (MAX6362 Only)
The watchdog monitors μP activity through the input
WDI. If the μP becomes inactive, the reset output is
asserted in pulses. To use the watchdog function, con-
nect WDI to a bus line or μP I/O line. A change of state
V CC
OUT
BATT
RESET/ RESET
BATT ON
MR , RESET IN,
WDI
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 = 0.
Asserted
High state
Inputs ignored
6
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| MAX6363PUT29+T | 功能描述:监控电路 Low-Power MPU Supervisor 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 |
| MAX6363PUT29-T | 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 |
| MAX6363PUT31 | 制造商:Maxim Integrated Products 功能描述:SOT23 LOW-POWER UP SUPERVISORY CIR - Cut Tape Product |
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