M48T59-70MH6 查看數據表（PDF） - STMicroelectronics
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M48T59-70MH6 Datasheet PDF : 21 Pages
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M48T59, M48T59Y, M48T59V
Table 8. Power Down/Up AC Characteristics
(TA = 0 to 70 °C or –40 to 85 °C)
Symbol
Parameter
Min
Max
Unit
tPD
E or W at VIH before Power Down
0
µs
tF (1)
VPFD (max) to VPFD (min) VCC Fall Time
300
µs
M48T59/Y
10
µs
tFB (2)
VPFD (min) to VSS VCC Fall Time
M48T59V
150
µs
tR
VPFD (min) to VPFD (max) VCC Rise Time
10
µs
tRB
VSS to VPFD (min) VCC Rise Time
1
µs
tREC (3) VPFD (max) to RST High
40
200
ms
Note: 1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after VCC pass-
es VPFD (min).
2. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
3. tREC (min) = 20ms for industrial temperature grade 6 device.
Figure 5. Power Down/Up Mode AC Waveforms
VCC
VPFD (max)
VPFD (min)
VSO
tF
tPD
tFB
RST
INPUTS
RECOGNIZED
OUTPUTS
VALID
(PER CONTROL INPUT)
tR
tRB
tDR
tREC
DON'T CARE
HIGH-Z
RECOGNIZED
VALID
(PER CONTROL INPUT)
AI03258
The SOIC and battery/crystal packages are
shipped separately in plastic anti-static tubes or in
Tape & Reel form. For the 28 lead SOIC, the bat-
tery/crystal package (i.e. SNAPHAT) part number
is "M4T28-BR12SH" or “M4T32-BR12SH”.
Caution: Do not place the SNAPHAT battery/crys-
tal top in conductive foam, as this will drain the lith-
ium button-cell battery.
As Figure 3 shows, the static memory array and
the quartz controlled clock oscillator of the
M48T59/59Y/59V are integrated on one silicon
chip.
The two circuits are interconnected at the upper
eight memory locations to provide user accessible
BYTEWIDE™ clock information in the bytes with
addresses 1FF8h-1FFFh. The clock locations
contain the century, year, month, date, day, hour,
minute, and second in 24 hour BCD format (except
for the century). Corrections for 28, 29 (leap year),
30, and 31 day months are made automatically.
Byte 1FF8h is the clock control register. This byte
controls user access to the clock information and
also stores the clock calibration setting.
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