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参数资料
| 型号： | MAX691AEUE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/17页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 16-TSSOP |
| 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，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
Microprocessor Supervisory Circuits
______________________________________________________________Pin Description
PIN
1
2
3
4
5
NAME
VBATT
V OUT
V CC
GND
BATT ON
FUNCTION
Battery-Backup Input. Connect to external battery or capacitor and charging circuit. If backup battery is not
used, connect to GND.
Output Supply Voltage. When V CC is greater than VBATT and above the reset threshold, V OUT connects to
V CC . When V CC falls below VBATT and is below the reset threshold, V OUT connects to VBATT. Connect a 0.1μF
capacitor from V OUT to GND. Connect V OUT to V CC if no backup battery is used.
Input Supply Voltage, 5V Input.
Ground. 0V reference for all signals.
Battery-On Output. When V OUT switches to VBATT, BATT ON goes high. When V OUT switches to V CC, BATT ON
goes low. Connect the base of a PNP through a current-limiting resistor to BATT ON for V OUT current require-
ments greater than 250mA.
6
LOW LINE LOW LINE output goes low when V CC falls below the reset threshold. It returns high as soon as V CC rises above
the reset threshold.
External Oscillator Input. When OSC SEL is unconnected or driven high, a 10μA pull-up connects from V OUT to
7
8
9
10
11
12
13
14
15
16
OSC IN
OSC SEL
PFI
PFO
WDI
CE OUT
CE IN
WDO
RESET
RESET
OSC IN, the internal oscillator sets the reset and watchdog timeout periods, and OSC IN selects between fast
and slow watchdog timeout periods. When OSC SEL is driven low, the reset and watchdog timeout periods may
be set either by a capacitor from OSC IN to ground or by an external clock at OSC IN (Figure 3).
Oscillator Select. When OSC SEL is unconnected or driven high, the internal oscillator sets the reset delay and
watchdog timeout period. When OSC SEL is low, the external oscillator input (OSC IN) is enabled (Table 1).
OSC SEL has a 10μA internal pull-up.
Power-Fail Input. This is the noninverting input to the power-fail comparator. When PFI is less than 1.25V, PFO
goes low. When PFI is not used, connect PFI to GND or V OUT .
Power-Fail Output. This is the output of the power-fail comparator. PFO goes low when PFI is less than 1.25V.
This is an uncommitted comparator, and has no effect on any other internal circuitry.
Watchdog Input. WDI is a three-level input. If WDI remains either high or low for longer than the watchdog time-
out period, WDO goes low and reset is asserted for the reset timeout period. WDO remains low until the next tran-
sition at WDI. Leaving WDI unconnected disables the watchdog function. WDI connects to an internal voltage
divider between V OUT and GND, which sets it to mid-supply when left unconnected.
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 15μs or until CE IN goes high, whichever occurs first.
Chip-Enable Input. The input to chip-enable gating circuit. If CE IN is not used, connect CE IN to GND or V OUT.
Watchdog Output. If WDI remains high or low longer than the watchdog timeout period, WDO goes low and reset
is asserted for the reset timeout period. WDO returns high on the next transition at WDI. WDO remains high if
WDI is unconnected.
RESET Output goes low whenever V CC falls below the reset threshold. RESET will remain low typically for
200ms after V CC crosses the reset threshold on power-up.
RESET is an active-high output. It is open drain, and the inverse of RESET .
–
_______________Detailed Description
– — — — — –
R E S E T and RESET Outputs
The MAX691A/MAX693A/MAX800L/MAX800M’s RESET
and RESET outputs ensure that the μP (with reset
inputs asserted either high or low) powers up in a
known state, and prevents code-execution errors dur-
ing power-down or brownout conditions.
The RESET output is active low, and typically sinks
3.2mA at 0.1V saturation voltage in its active state.
When deasserted, RESET sources 1.6mA at typically
V OUT - 0.5V. RESET output is open drain, active high,
and typically sinks 3.2mA with a saturation voltage of
0.1V. When no backup battery is used, RESET output is
guaranteed to be valid down to V CC = 1V, and an
external 10k Ω pulldown resistor on RESET insures that
it will be valid with V CC down to GND (Figure 1). As
V CC goes below 1V, the gate drive to the RESET output
switch reduces accordingly, increasing the R DS(ON)
and the saturation voltage. The 10k Ω pulldown resistor
insures the parallel combination of switch plus resistor
is around 10k Ω and the output saturation voltage is
below 0.4V while sinking 40μA. When using a 10k Ω
external pulldown resistor, the high state for
RESET output with V CC = 4.75V will be 4.5V typical.
For battery voltages ≥ 2V connected to VBATT, RESET
and RESET remain valid for V CC from 0V to 5.5V.
_______________________________________________________________________________________
7
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| MAX691AEWE | 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 |
| MAX691AEWE/GG8 | 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 |
| MAX691AEWE+ | 功能描述:监控电路 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 |
| MAX691AEWE+T | 功能描述:监控电路 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 |
| MAX691AEWE-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 |
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