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M48T212V-85MH1E Datasheet(PDF) 4 Page - STMicroelectronics

Part # M48T212V-85MH1E
Description  3.3V TIMEKEEPER supervisor
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T212V-85MH1E Datasheet(HTML) 4 Page - STMicroelectronics

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Figure 1.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2.
SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3.
Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
Chip enable control and bank select timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5.
Read cycle timing: RTC control signal waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6.
Write cycle timing: RTC control signal waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7.
Alarm interrupt reset waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 8.
Back-up mode alarm waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 9.
(RSTIN1 & RSTIN2) timing waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 10.
Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 11.
Calibration waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 12.
Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 13.
AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 14.
Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 15.
SOH44 – 44-lead plastic small outline, SNAPHAT, package outline . . . . . . . . . . . . . . . . . 30
Figure 16.
SH – 4-pin SNAPHAT housing for 48 mAh battery & crystal, package outline. . . . . . . . . . 31
Figure 17.
SH – 4-pin SNAPHAT housing for 120mAh battery & crystal, package outline . . . . . . . . . 32



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