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M4T28-BR12SH 데이터시트 PDF




ST Microelectronics에서 제조한 전자 부품 M4T28-BR12SH은 전자 산업 및 응용 분야에서
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부품번호 M4T28-BR12SH 기능
기능 TIMEKEEPER SNAPHAT Battery & Crystal
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M4T28-BR12SH 데이터시트, 핀배열, 회로
M41ST85Y
M41ST85W
5.0 OR 3.0V, 512 bit (64 x 8) SERIAL
RTC and NVRAM SUPERVISOR
FEATURES SUMMARY
s 5.0 OR 3.0V OPERATING VOLTAGE
s SERIAL INTERFACE SUPPORTS I2C BUS
(400 KHz)
s NVRAM SUPERVISOR FOR EXTERNAL
LPSRAM
s OPTIMIZED FOR MINIMAL INTERCONNECT
TO MCU
s 2.5 TO 5.5V OSCILLATOR OPERATING
VOLTAGE
s AUTOMATIC SWITCH-OVER and DESELECT
CIRCUITRY
s CHOICE OF POWER-FAIL DESELECT
VOLTAGES
– M41ST85Y: VCC = 4.5 to 5.5V;
4.20V VPFD 4.50V
– M41ST85W: VCC = 2.7 to 3.6V;
2.55V VPFD 2.70V
s 1.25V REFERENCE (for PFI/PFO)
s COUNTERS FOR TENTHS/HUNDREDTHS
OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, and
CENTURY
s 44 BYTES OF GENERAL PURPOSE RAM
s PROGRAMMABLE ALARM and INTERRUPT
FUNCTION (VALID EVEN DURING BATTERY
BACK-UP MODE)
s WATCHDOG TIMER
s MICROPROCESSOR POWER-ON RESET
s BATTERY LOW FLAG
s POWER-DOWN TIMESTAMP (HT BIT)
s ULTRA-LOW BATTERY SUPPLY CURRENT
OF 500nA (MAX)
s PACKAGING INCLUDES A 28-LEAD SOIC and
SNAPHAT® TOP (to be Ordered Separately)
s SOIC SNAPHAT PACKAGE PROVIDES
DIRECT CONNECTION FOR A SNAPHAT
TOP WHICH CONTAINS THE BATTERY and
CRYSTAL
s SOIC EMBEDDED CRYSTAL PACKAGE (MX)
OPTION
Figure 1. 28-pin SOIC Package
SNAPHAT (SH)
Battery & Crystal
28
1
SOH28 (MH)
Figure 2. 28-pin (300mil) SOIC Package
EMBEDDED Crystal
SOX28 (MX)
May 2003
Rev. 4.0
1/33




M4T28-BR12SH pdf, 반도체, 판매, 대치품
M41ST85Y, M41ST85W
SUMMARY DESCRIPTION
The M41ST85Y/W Serial TIMEKEEPER®/Con-
troller SRAM is a low power 512-bit, static CMOS
SRAM organized as 64 words by 8 bits. A built-in
32.768 kHz oscillator (external crystal controlled)
and 8 bytes of the SRAM (see Table 8, page 18)
are used for the clock/calendar function and are
configured in binary coded decimal (BCD) format.
An additional 12 bytes of RAM provide status/con-
trol of Alarm, Watchdog and Square Wave func-
tions. Addresses and data are transferred serially
via a two line, bi-directional I2C interface. The
built-in address register is incremented automati-
cally after each WRITE or READ data byte. The
M41ST85Y/W has a built-in power sense circuit
which detects power failures and automatically
switches to the battery supply when a power fail-
ure occurs. The energy needed to sustain the
SRAM and clock operations can be supplied by a
small lithium button-cell supply when a power fail-
ure occurs.
Functions available to the user include a non-vol-
atile, time-of-day clock/calendar, Alarm interrupts,
Watchdog Timer and programmable Square
Wave output. Other features include a Power-On
Reset as well as two additional debounced inputs
(RSTIN1 and RSTIN2) which can also generate an
output Reset (RST). The eight clock address loca-
tions contain the century, year, month, date, day,
hour, minute, second and tenths/hundredths of a
second in 24 hour BCD format. Corrections for 28,
29 (leap year - valid until year 2100), 30 and 31
day months are made automatically.
The M41ST85Y/W is supplied in a 28-lead SOIC
SNAPHAT® package (which integrates both crys-
tal and battery in a single SNAPHAT top) or a 28-
pin, 300mil SOIC package (MX) which includes an
embedded 32kHz crystal.
The 28-pin, 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT housing contain-
ing the battery and crystal. The unique design
allows the SNAPHAT battery/crystal package to
be mounted on top of the SOIC package after the
completion of the surface mount process.
Insertion of the SNAPHAT housing after reflow
prevents potential battery and crystal damage due
to the high temperatures required for device sur-
face-mounting. The SNAPHAT housing is also
keyed to prevent reverse insertion.
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 (e.g., SNAPHAT) part num-
ber is “M4TXX-BR12SH” (see Table 15, page 27).
Caution: Do not place the SNAPHAT battery/crys-
tal top in conductive foam, as this will drain the lith-
ium button-cell battery.
The 300mil, embedded crystal SOIC requires only
a user-supplied battery to provide non-volatile op-
eration.
4/33

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M4T28-BR12SH 전자부품, 판매, 대치품
Figure 7. Hardware Hookup
Unregulated
Voltage
Regulator
VIN VCC
Pushbutton
R1 Reset
R2
M41ST85Y/W
VCC
VOUT
ECON
EX
SCL
WDI SDA
RSTIN1
RST
RSTIN2
SQW
PFO
PFI
VBAT(1) IRQ/FT/OUT
VSS
Note: 1. Required for embedded crystal (MX) package only.
M41ST85Y, M41ST85W
VCC
E
M68Z128Y/W
or
M68Z512Y/W
To RST
To LED Display
To NMI
To INT
AI03660
MAXIMUM RATING
Stressing the device above the rating listed in the
“Absolute Maximum Ratings” table may cause
permanent damage to the device. These are
stress ratings only and operation of the device at
these or any other conditions above those indicat-
ed in the Operating sections of this specification is
not implied. Exposure to Absolute Maximum Rat-
ing conditions for extended periods may affect de-
vice reliability. Refer also to the
STMicroelectronics SURE Program and other rel-
evant quality documents.
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
TSTG
Storage Temperature (VCC Off, Oscillator Off)
SNAPHAT®
SOIC
–40 to 85
–55 to 125
°C
°C
TSLD (1) Lead Solder Temperature for 10 seconds
260 °C
VIO Input or Output Voltage
–0.3 to VCC+0.3
V
VCC
Supply Voltage
M41ST85Y
M41ST85W
–0.3 to 7
–0.3 to 4.6
V
V
IO Output Current
20 mA
PD Power Dissipation
1W
Note: 1. Reflow at peak temperature of 215°C to 225°C for < 60 seconds (total thermal budget not to exceed 180°C for between 90 to 120
seconds).
CAUTION: Negative undershoots below –0.3V are not allowed on any pin while in the Battery Back-up mode.
CAUTION: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
7/33

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관련 데이터시트

부품번호상세설명 및 기능제조사
M4T28-BR12SH

"5.0 OR 3.0V

 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR"
512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR"
M4T28-BR12SH

TIMEKEEPER SNAPHAT Battery & Crystal

ST Microelectronics
ST Microelectronics

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