- 您现在的位置：买卖IC网 > PDF目录13793 > MAX6719UTVHD3+T (Maxim Integrated Products)IC SUPERVISOR MPU SOT23-6 PDF资料下载
参数资料
| 型号： | MAX6719UTVHD3+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 1.313V，1.575V，可调 |
| 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) |
Dual/Triple Ultra-Low-Voltage SOT23 μP
Supervisory Circuits
A
R3
V IN
V GOOD
V FAIL
START
V EXT
MAX6728/
MAX6729
PFO
SET WDI
HIGH
R1
R2
PFI
PFO
V GOOD = DESIRED V EXT GOOD VOLTAGE THRESHOLD
V FAIL = DESIRED V EXT FAIL VOLTAGE THRESHOLD
PROGRAM
CODE
V OH = V CC 1 (FOR PUSH-PULL PFO)
R2 = 200k ? (FOR > 2.5 μ A R2 CURRENT)
GND
R1 = R2 ((V GOOD - V PFI ) - (V PFI )(V GOOD - V FAIL ) / V OH ) / V PFI
R3 = (R1 x V OH ) / (V GOOD - V FAIL )
SUBROUTINE OR
PROGRAM LOOP
SET WDI LOW
Figure 5. Adding Hysteresis to Power-Fail for Push-Pull PFO
Monitoring an Additional Power Supply
These μP supervisors can monitor either positive or
negative supplies using a resistor voltage-divider to
PFI. PFO can be used to generate an interrupt to the μP
SUBROUTINE
COMPLETED
RETURN
HANG IN
SUBROUTINE
or cause reset to assert (Figure 3).
Monitoring a Negative Voltage
The power-fail comparator can be used to monitor a
negative supply voltage using the circuit shown in
Figure 3. When the negative supply is valid, PFO is low.
When the negative supply voltage drops, PFO goes
high. The circuit ’s accuracy is affected by the PFI
threshold tolerance, V CC , R1, and R2.
Negative-Going V CC Transients
The MAX6715 –MAX6729 supervisors are relatively
immune to short-duration negative-going V CC transients
(glitches). It is usually undesirable to reset the μP when
V CC experiences only small glitches. The Typical
Operating Characteristics show Maximum Transient
Duration vs. Reset Threshold Overdrive, for which reset
pulses are not generated. The graph was produced
using negative-going V CC pulses, starting above V TH
and ending below the reset threshold by the magnitude
indicated (reset threshold overdrive). The graph shows
the maximum pulse width that a negative-going V CC
transient may typically have without causing a reset
pulse to be issued. As the amplitude of the transient
increases (i.e., goes farther below the reset threshold),
the maximum allowable pulse width decreases. A 0.1μF
bypass capacitor mounted close to the V CC pin pro-
vides additional transient immunity.
Watchdog Software Considerations
Setting and resetting the watchdog input at different
points in the program, rather than “pulsing” the watch-
dog input high-low-high or low-high-low, helps the
Figure 6. Watchdog Flow Diagram
watchdog timer to closely monitor software execution.
This technique avoids a “stuck” loop where the watch-
dog timer continues to be reset within the loop, keeping
the watchdog from timing out. Figure 6 shows an exam-
ple flow diagram where the I/O driving the watchdog
input is set high at the beginning of the program, set low
at the beginning of every subroutine or loop, then set
high again when the program returns to the beginning. If
the program should “hang” in any subroutine, the I/O is
continually set low and the watchdog timer is allowed to
time out, causing a reset or interrupt to be issued.
Chip Information
TRANSISTOR COUNT: 1072
PROCESS: BiCMOS
12
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| ESM25DRTI-S13 | CONN EDGECARD 50POS .156 EXTEND |
| MAX6719UTTGD1+T | IC SUPERVISOR MPU SOT23-6 |
| MAX6719AUTZWD3+T | IC SUPERVISOR MPU SOT23-6 |
| SRF1280-331M | IND SHIELDED POWER 330UH SMD |
| MAX6720AUTTID3+T | IC SUPERVISOR MPU SOT23-6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6719UTVHD4 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6719UTVHD4+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 |
| MAX6719UTVHD4-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 |
| MAX6719UTVHD5 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6719UTVHD5+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 |
发布紧急采购，3分钟左右您将得到回复。