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M41T256Y 데이터시트 PDF




ST Microelectronics에서 제조한 전자 부품 M41T256Y은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 M41T256Y 자료 제공

부품번호 M41T256Y 기능
기능 256 Kbit 32K x8 SERIAL RTC
제조업체 ST Microelectronics
로고 ST Microelectronics 로고


M41T256Y 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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M41T256Y 데이터시트, 핀배열, 회로
www.DataSheet4U.com
M41T256Y
256 Kbit (32K x8) Serial RTC
FEATURES SUMMARY
5V OPERATING VOLTAGE
SERIAL INTERFACE SUPPORTS
EXTENDED I2C BUS ADDRESSING
(400kHz)
AUTOMATIC SWITCH-OVER AND
DESELECT CIRCUITRY
POWER-FAIL DESELECT VOLTAGES:
– M41T256Y: VCC = 4.5 to 5.5V;
VPFD = 4.2 < VPFD < 4.5V
COUNTERS FOR TENTHS/HUNDREDTHS
OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, and YEAR
PROGRAMMABLE SOFTWARE CLOCK
CALIBRATION
32,752 BYTES OF GENERAL PURPOSE
RAM
MICROPROCESSOR POWER-ON RESET
HOLDS MICROPROCESSOR IN RESET
UNTIL SUPPLY VOLTAGE REACHES
STABLE OPERATING LEVEL
AUTOMATIC ADDRESS-INCREMENTING
TAMPER INDICATION CIRCUIT WITH TIME-
STAMP
SLEEP MODE FUNCTION
PACKAGING INCLUDES A 44-LEAD SOIC
AND SNAPHAT® TOP (to be ordered
separately)
SOIC PACKAGE PROVIDES DIRECT
CONNECTION FOR A SNAPHAT® TOP
WHICH CONTAINS THE BATTERY AND
CRYSTAL
Figure 1. 44-pin, Hatless SOIC Package
44
1
SO44 (MT)
Figure 2. 44-pin SOIC Package
SNAPHAT (SH)
Crystal/Battery
44
1
SOH44 (MH)
June 2004
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M41T256Y pdf, 반도체, 판매, 대치품
M41T256Y
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 I2C 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
VCC VBAT(1)
XI(1)
XO(1)
SCL
SDA
TP
M41T256Y
RST
FT
VSS
AI04754b
Note: 1. For 44-pin SNAPHAT (MT) package only.
Table 1. Signal Names
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
VCC Supply Voltage
VBAT(1)
Battery Supply Voltage
VSS Ground
TP Tamper Input
Note: 1. For 44-pin SNAPHAT (MT) package only.
4/27

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M41T256Y 전자부품, 판매, 대치품
Figure 7. Serial Bus Data Transfer Sequence
DATA LINE
STABLE
DATA VALID
(SCL) CLOCK
M41T256Y
(SDA) DATA
START
CONDITION
CHANGE OF
DATA ALLOWED
Figure 8. Acknowledgement Sequence
SCL FROM
MASTER
START
1
DATA OUTPUT
BY TRANSMITTER
MSB
DATA OUTPUT
BY RECEIVER
2
STOP
CONDITION
AI04756
CLOCK PULSE FOR
ACKNOWLEDGEMENT
89
LSB
AI00601
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