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PDF M48T86 Data sheet ( Hoja de datos )
| Número de pieza | M48T86 | |
| Descripción | 5V PC REAL TIME CLOCK | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de M48T86 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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M48T86
5.0 V PC real-time clock
Not For New Design
Features
■ Drop-in replacement for PC computer
clock/calendar
■ Counts seconds, minutes, hours, days, day of
)the week, date, month, and year with leap year
t(scompensation
c■ Clock accuracy better than ±1 minute per
umonth
rod )■ Interfaced with software as 128 RAM locations:
P t(s– 14 bytes of clock and control registers
te c– 114 bytes of general purpose RAM
le u■ Selectable bus timing (Intel/Motorola)
so rod■ Three interrupts are separately software-
maskable and testable
b P– Time-of-day alarm (once/second to
- O teonce/day)
) le– Periodic rates from 122 µs to 500 ms
t(s so– End-of-clock update cycle
c b■ Programmable square wave output
du - O■ 10 years of data retention and clock operation
ro )in the absence of power
P t(s■ Self-contained battery and crystal in the
te cCAPHAT™ DIP package
le u■ Packaging includes a 28-lead SOIC and
so rodSNAPHAT® top (to be ordered separately)
■ SOIC package provides direct connection for a
b PSNAPHAT top contains the battery and crystal
O te■ Pin and function compatible with bq3285/7A
leand DS12887
so■ RoHS compliant
Ob– Lead-free second level interconnect
24
1
PCDIP24 (PC)
Battery/Crystal
CAPHAT
SNAPHAT (SH)
Battery/Crystal
28
1
SOH28 (MH)
December 2008
Rev 7
This is information on a product still in production but not recommended for new designs.
1/36
www.st.com
1
1 page  
M48T86
List of figures
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. 24-pin DIP connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. 28-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Intel bus read AC waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6. Intel bus write mode AC waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7. Motorola bus read/write mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 8. Address map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9.
Figure 10.
)Figure 11.
t(sFigure 12.
cFigure 13.
uFigure 14.
dFigure 15.
ro )Figure 16.
P t(sFigure 17.
te cFigure 18.
OObbssoolleettee PPrroodduucctt((ss)) -- OObbssoolleete ProduFigure 19.
Update period timing and UIP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Update-ended/periodic interrupt relationship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
AC testing load circuit (no IRQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
AC testing load circuit (with IRQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
PCDIP24 – 24-pin plastic DIP, battery CAPHAT™, package outline . . . . . . . . . . . . . . . . . 29
SOH28 – 28-lead plastic small outline, 4-socket SNAPHAT®, package outline . . . . . . . . . 30
SH – 4-pin SNAPHAT® housing for 48 mAh battery and crystal, package outline . . . . . . . 31
SH – 4-pin SNAPHAT® housing for 120 mAh battery and crystal, package outline . . . . . . 32
Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
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5 Page 
M48T86
Operation
2.1.11
R/W (read/write input)
The R/W pin is used to latch data into the M48T86 and provides functionality similar to W in
other memory systems.
2.1.12
Non-volatile RAM
The 114 general-purpose non-volatile RAM bytes are not dedicated to any special function
within the M48T86. They can be used by the processor program as non-volatile memory
and are fully accessible during the update cycle.
Figure 5. Intel bus read AC waveform
t(s)AS
ducDS
Pro t(s)R/W
lete uctDAS
so rodE
- Ob te PAD0-AD7
tCYC
tASW
tASD
tDSL
tDSH
tCS tOD
tAS tAH
uct(s) ObsoleFigure 6. Intel bus write mode AC waveform
te Prod ct(s) -AS
le utDAS
so rodDS
Ob te PR/W
ObsoleE
tCYC
tASW
tASD
tDSL
tDSH
tCS
tAS tAH
tCH
tDHR
AI01647
tCH
tDW tDHW
AD0-AD7
AI01648
11/36
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet M48T86.PDF ] | |
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