參數(shù)資料
型號(hào)： M41T256YMH7F
廠商： 意法半導(dǎo)體
英文描述： 256 Kbit 32K x8 SERIAL RTC
中文描述： 256千位32K的x8串行實(shí)時(shí)時(shí)鐘
文件頁(yè)數(shù)： 4/27頁(yè)
文件大?。?/td> 185K
代理商： M41T256YMH7F
M41T256Y
4/27
SUMMARY DESCRIPTION
The M41T256Y Serial TIMEKEEPER
SRAM is a
low power 256 Kbit static CMOS SRAM organized
as 32K words by 8 bits. A built-in 32.768kHz oscil-
lator (external crystal controlled) and 8 bytes of the
SRAM (see
Table 3., page 14
) are used for the
clock/calendar function and are configured in bina-
ry coded decimal (BCD) format.
Addresses and data are transferred serially via a
two line, bi-directional I
2
C interface. The built-in
address register is incremented automatically af-
ter each WRITE or READ data byte.
The M41T256Y 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
lithium button-cell supply when a power failure oc-
curs. Functions available to the user include a
non-volatile, time-of-day clock/calendar, and Pow-
er-on Reset. The eight clock address locations
contain the year, month, date, day, hour, minute,
second, and tenths/hundredths of seconds in 24-
hour BCD format. Corrections for 28, 29 (leap year
- valid until year 2100), 30 and 31 day months are
made automatically. The first clock address loca-
tion (7FF8h) stores the clock software calibration
settings as well as the Write Clock Bit.
The M41T256Y is supplied in a 44-lead SOIC
SNAPHAT
package (MH - which integrates both
crystal and battery in a single SNAPHAT top) or a
44-pin “hatless” SOIC (MT). The 44-pin, 330mil
SOIC provides sockets with gold-plated contacts
at both ends for direct connection to a separate
SNAPHAT housing containing 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 sur-
face-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 44-pin
SOIC and crystal/battery packages are shipped
separately in plastic, anti-static tubes or in Tape &
Reel form. For the 44-lead SOIC, the battery/crys-
tal package (e.g., SNAPHAT) part number is
“M4Txx-BR12SH” (see
Table 15., page 25
).
Caution:
Do not place the SNAPHAT battery/crys-
tal top in conductive foam, as this will drain the lith-
ium, button-cell battery.
Figure 3. Logic Diagram
Note: 1. For 44-pin SNAPHAT (MT) package only.
Table 1. Signal Names
Note: 1. For 44-pin SNAPHAT (MT) package only.
AI04754b
SCL
VCC
M41T256Y
VSS
SDA
TP
FT
RST
VBAT(1)
XI(1)
XO(1)
XI
(1)
Oscillator Input
XO
(1)
Oscillator Output
FT
Frequency Test (Open drain)
RST
Reset Output (Open drain)
SCL
Serial Clock Input
SDA
Serial Data Input/Output
V
CC
Supply Voltage
V
BAT(1)
Battery Supply Voltage
V
SS
Ground
TP
Tamper Input
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M41T256YMH7TR 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:256 Kbit 32K x8 SERIAL RTC
M41T256YMT 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:256 Kbit 32K x8 SERIAL RTC
M41T256YMT7 功能描述:實(shí)時(shí)時(shí)鐘 Serial 256K (32Kx8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M41T256YMT7E 功能描述:實(shí)時(shí)時(shí)鐘 Serial 256K (32Kx8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M41T256YMT7F 功能描述:實(shí)時(shí)時(shí)鐘 Serial 256K (32Kx8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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