- 您现在的位置：买卖IC网 > PDF目录13958 > DS1708TEUA+T&R (Maxim Integrated Products)IC MICROMONITOR 3.3V 5% 8-USOP PDF资料下载
参数资料
| 型号： | DS1708TEUA+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/10页 |
| 文件大小： | 0K |
| 描述： | IC MICROMONITOR 3.3V 5% 8-USOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 3,000 |
| 系列： | MicroMonitor™ |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 130 ms |
| 电压 - 阀值： | 3.08V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
DS1707/DS1708
The third function the DS1707/DS1708 performs is pushbutton reset control. The DS1707/DS1708
debounces the pushbutton input and guarantees an active reset pulse width of 130 ms minimum.
OPERATION
Power Monitor
The DS1707/DS1708 detects out-of-tolerance power supply conditions and warns a processor-based
system of impending power failure. When V CC falls below the minimum V CC tolerance, a comparator
outputs the RST and RST signals. RST and RST are excellent control signals for a microprocessor, as
processing is stopped at the last possible moment of valid V CC . On power-up, RST and RST are kept
active for a minimum of 130 ms to allow the power supply and processor to stabilize.
Pushbutton Reset
The DS1707/DS1708 provides an input pin for direct connection to a pushbutton reset (see Figure 2). The
pushbutton reset input requires an active low signal. Internally, this input is debounced and timed such
that RST and RST signals of at least 130 ms minimum will be generated. The 130 ms delay commences
as the pushbutton reset input is released from the low level. The pushbutton can be initiated by connecting
the NMI output to the PBRST input as shown in Figure 3.
Non-Maskable Interrupt
The DS1707/DS1708 generates a non-maskable interrupt ( NMI ) for early warning of a power failure. A
precision comparator monitors the voltage level at the IN pin relative to an on-chip reference generated
by an internal band gap. The IN pin is a high impedance input allowing for a user-defined sense point. An
external resistor voltage divider network (Figure 5) is used to interface with high voltage signals. This
sense point may be derived from a regulated supply or from a higher DC voltage level closer to the main
system power input. Since the IN trip point V TP is 1.25 volts, the proper values for R1 and R2 can be
determined by the equation as shown in Figure 5. Proper operation of the DS1707/DS1708 requires that
the voltage at the IN pin be limited to V CC . Therefore, the maximum allowable voltage at the supply being
monitored (V MAX ) can also be derived as shown in Figure 5. A simple approach to solving the equation is
to select a value for R2 high enough to keep power consumption low, and solve for R1. The flexibility of
the IN input pin allows for detection of power loss at the earliest point in a power supply system,
maximizing the amount of time for system shut-down between NMI and RST/ RST .
When the supply being monitored decays to the voltage sense point, the DS1707/DS1708 pulses the NMI
output to the active state for a minimum 200 m s. The NMI power-fail detection circuitry also has built-in
hysteresis of 100 m V. The supply must be below the voltage sense point for approximately 5 m s before a
low NMI will be generated. In this way, power supply noise is removed from the monitoring function,
preventing false interrupts. During a power-up, any detected IN pin levels below V TP by the comparator
are disabled from generating an interrupt until V CC rises to V CCTP . As a result, any potential NMI pulse
will not be initiated until V CC reaches V CCTP .
Connecting NMI to PBRST would allow the non-maskable interrupt to generate an automatic reset when
an out-of-tolerance condition occurred in a monitored supply. An example is shown in Figure 3.
2 of 10
相关PDF资料 |
PDF描述 |
|---|---|
| VE-J24-EZ-F2 | CONVERTER MOD DC/DC 48V 25W |
| ACM10DTKN | CONN EDGECARD 20POS DIP .156 SLD |
| VE-J24-EZ-F1 | CONVERTER MOD DC/DC 48V 25W |
| VE-J24-EY-S | CONVERTER MOD DC/DC 48V 50W |
| DS1707EUA+T&R | IC MICROMONITOR 5V 5% 8-USOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1710 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Partitioned NV Controller |
| DS1710EN | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| DS1710S/T&R/C01 | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| DS17-12A | 功能描述:整流器 17 Amps 1200V RoHS:否 制造商:Vishay Semiconductors 产品:Standard Recovery Rectifiers 配置: 反向电压:100 V 正向电压下降: 恢复时间:1.2 us 正向连续电流:2 A 最大浪涌电流:35 A 反向电流 IR:5 uA 安装风格:SMD/SMT 封装 / 箱体:DO-221AC 封装:Reel |
| DS171G | 制造商:Cooper Crouse-Hinds 功能描述: |
发布紧急采购，3分钟左右您将得到回复。