参数资料
型号: M41ST85Y-70MH6
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, PDSO28
封装: 0.330 INCH, SNAPHAT, PLASTIC, SOH-28
文件页数: 11/32页
文件大小: 171K
代理商: M41ST85Y-70MH6
19/32
M41ST85Y, M41ST85W
Power-on Reset
The M41ST85Y/W 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. The
RST pin is an open drain output and an appropri-
ate pull-up resistor should be chosen to control
rise time.
Reset Inputs (RSTIN1 & RSTIN2)
The M41ST85Y/W provides two independent in-
puts which can generate an output reset. The du-
ration and function of these resets is identical to a
reset generated by a power cycle. Table 6 and Fig-
ure 16 illustrate the AC reset characteristics of this
function. Pulses shorter than tR1 and tR2 will not
generate a reset condition. RSTIN1 and RSTIN2
are each internally pulled up to VCC through a
100k
resistor.
Figure 16. RSTIN1 & RSTIN2 Timing Waveforms
Table 6. Reset AC Characteristics
Note: 1. Pulse width less than 50ns will result in no RESET (for noise immunity).
2. Pulse width less than 20ms will result in no RESET (for noise immunity).
3. CL = 5pF (see Figure 19, page 23).
Symbol
Parameter
Min
Max
Unit
tR1
(1)
RSTIN1 Low to RSTIN1 High
200
ns
tR2
(2)
RSTIN2 Low to RSTIN2 High
100
ms
tR1HRH
(3)
RSTIN1 High to RST High
40
200
ms
tR2HRH
(3)
RSTIN2 High to RST High
40
200
ms
AI03665
RSTIN2
RST
(1)
RSTIN1
tR1
tR2
tR1HRH
tR2HRH
Note: 1. With pull-up resistor
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