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参数资料
| 型号： | M48T201V-85MH1E |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封装： | SNAPHAT, ROHS COMPLIANT, PLASTIC, SOIC-44 |
| 文件页数： | 15/37页 |
| 文件大小： | 311K |
| 代理商： | M48T201V-85MH1E |
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Clock operation
M48T201Y, M48T201V
3.8
Power-on reset
The M48T201Y/V continuously monitors VCC. When VCC falls to the power fail detect trip
point, the RST pulls low (open drain) and remains low on power-up for tREC after VCC
passes VPFD (max). The RST pin is an open drain output and an appropriate pull-up resistor
to VCC should be chosen to control rise time.
3.9
Reset inputs (RSTIN1 & RSTIN2)
The M48T201Y/V provides two independent inputs which can generate an output reset. The
duration and function of these resets is identical to a reset generated by a power cycle.
than tR1 and tR2 will not generate a reset condition. RSTIN1 and RSTIN2 are each internally
pulled up to VCC through a 100 KΩ resistor.
Figure 9.
RSTIN1 and RSTIN2 timing waveforms
Table 8.
Reset AC characteristics
3.10
Calibrating the clock
The M48T201Y/V is driven by a quartz controlled oscillator with a nominal frequency of
32,768 Hz. The devices are factory calibrated at 25°C and tested for accuracy. Clock
accuracy will not exceed ±35 ppm (parts per million) oscillator frequency error at 25°C,
which equates to about ±1.53 minutes per month. When the calibration circuit is properly
employed, accuracy improves to better than +1/–2 ppm at 25°C.
Symbol
Parameter(1)
1.
Valid for ambient operating temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5 V or 3.0 to 3.6 V (except where
noted).
Min
Max
Unit
tR1
RSTIN1 low to RST low
50
200
ns
tR2
RSTIN2 low to RST low
20
100
ms
tR1HRZ
(2)
2.
RSTIN1 high to RST Hi-Z
40
200
ms
tR2HRZ
RSTIN2 high to RST Hi-Z
40
200
ms
AI01679
RSTIN1
RST
RSTIN2
tR1
tR1HRZ
Hi-Z
tR2
tR2HRZ
Hi-Z
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PDF描述 |
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| M48T201Y-70MH1E | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201V-85MH6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MH6 | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MHTR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T201V-85MH1F | 功能描述:监控电路 SRAM TK Controller 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 |
| M48T201V-85MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V TIMEKEEPER㈢ supervisor |
| M48T201VMH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201VSH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
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