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M48T201Y датащи(PDF) 19 Page - STMicroelectronics

номер детали M48T201Y
подробное описание детали  3.3V-5V TIMEKEEPER CONTROLLER
PDF  33 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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M48T201Y датащи(HTML) 19 Page - STMicroelectronics

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M48T201Y, M48T201V
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 appro-
priate pull-up resistor to VCC should be chosen to
control rise time.
Reset Inputs (RSTIN1 & RSTIN2)
The M48T201Y/V 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. Figure 10 and
Table 8 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
Ω resistor.
Figure 10. RSTIN1 and RSTIN2 Timing Waveforms
Table 8. Reset AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
2. CL = 5pF (see Figure 14., page 25).
Symbol
Parameter(1)
Min
Max
Unit
tR1
RSTIN1 Low to RST Low
50
200
ns
tR2
RSTIN2 Low to RST Low
20
100
ms
tR1HRZ
(2)
RSTIN1 High to RST Hi-Z
40
200
ms
tR2HRZ
(2)
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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