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参数资料
| 型号： | M41ST84Y-85MH6TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.330 INCH, SNAPHAT, PLASTIC, SOH-28 |
| 文件页数： | 27/32页 |
| 文件大小： | 168K |
| 代理商： | M41ST84Y-85MH6TR |
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M41ST84Y, M41ST84W
4/32
SUMMARY DESCRIPTION
The M41ST84Y/W Serial supervisory TIMEKEEP-
ER 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 Figure 3, page 15)
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 M41ST84Y/W has a built-in power sense cir-
cuit which detects power failures and automatical-
ly switches to the battery supply when a power
failure 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-volatile, time-of-day clock/calendar, Alarm
interrupts, Watchdog Timer and programmable
Square Wave output. Other features include a
Power-On Reset as well as an additional input
(RSTIN) which can also generate an output Reset
(RST). The eight clock address locations 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 ninth clock address loca-
tion controls user access to the clock information
and also stores the clock software calibration set-
ting.
The M41ST84Y/W is supplied in a 28 lead SOIC
SNAPHAT package (which integrates both crystal
and battery in a single SNAPHAT top) or a 16 pin
SOIC. The 28 pin 330mil SOIC provides sockets
with gold plated contacts at both ends for direct
connection to a separate SNAPHAT housing con-
taining 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 28-pin 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 “M4TXX-BR12SH” (see Table 18, page 30).
Caution: Do not place the SNAPHAT battery/crys-
tal top in conductive foam, as this will drain the lith-
ium button-cell battery.
相关PDF资料 |
PDF描述 |
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| M41ST84W-70MQ6 | 1 TIMER(S), REAL TIME CLOCK, PDSO16 |
| M41ST84Y-70MH6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST84WMQ6 | 1 TIMER(S), REAL TIME CLOCK, PDSO16 |
| M41ST84YMH6E | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST85Y-70MH6 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M41ST84YMH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
| M41ST84YMH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
| M41ST84YMH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
| M41ST84YMQ | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
| M41ST84YMQ1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
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