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M41T315V-85MH6, M41T315Y, M41T56

Table of contents:
Info of M41T315V-85MH6
Info of M41T315Y
Info of M41T56

M41T315V-85MH6, M41T315Y, M41T56 Selling Leads, Datasheet

MFG:ST Package Cooled:SOP-28 D/C:2003+

M41T315V-85MH6, M41T315Y, M41T56 Picture

M41T315V-85MH6, M41T315Y, M41T56 Datasheet download

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Part Number: M41T315V-85MH6

MFG: ST

Package Cooled: SOP-28

D/C: 2003+

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M41T315Y General Description

The M41T315Y/V/W RTC Supervisor is a combination of a CMOS TIMEKEEPER^® and a nonvolatile memory supervisor. Power is constantly monitored by the memory supervisor. In the event of power instability or absence, an external battery maintains the timekeeping operation and provides power for a CMOS static RAM by switching on and invoking write protection to prevent data corruption in the memory and RTC.

The clock keeps track of tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, and year information. The last day of the month is automatically adjusted for months with less than 31 days, including leap year correction.

The clock operates in one of two formats: a 12-hour mode with an AM/PM indicator; or a 24-hour mode

The nonvolatile supervisor supplies all the necessary support circuitry to convert a CMOS RAM to a nonvolatile memory. The M41T315Y/V/W can be interfaced with RAM without leaving gaps in memory.

The M41T315Y/V/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 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 surface mount process.

Insertion of the SNAPHAT housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface- 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 battery/ crystal package (e.g., SNAPHAT) part number is "M4TXX-BR12SH" (see Table 17., page 22).

Caution: Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the lithium button-cell battery.

M41T315Y Maximum Ratings

Symbol	Parameter		Value	Unit
T_A	Ambient Operating Temperature		40 to 85
T_STG	Storage Temperature (V_CC Off, Oscillator Off)	SNAPHAT	40 to 85
T_STG	Storage Temperature (V_CC Off, Oscillator Off)	SOIC	55 to 125
T_SLD⁽¹⁾	Lead Solder Temperature for 10 seconds		260
V_IO	Input or Output Voltage		0.3 to 7.0	V
V_CCI	Supply Voltage (on any pin relative to Ground)	M41T315Y	0.3 to 4.6	V
V_CCI	Supply Voltage (on any pin relative to Ground)	M41T315V/W	-0.3 to V_CC + 0.3	V
I_O	Output Current		20	mA
P_D	Power Dissipation		1	W

Note: 1. For SO package, standard (SnPb) lead finish: Reflow at peak temperature of 225°C (total thermal budget not to exceed 180°C for between 90 to 150 seconds).
2. For SO package, Lead-free (Pb-free) lead finish: Reflow at peak temperature of 260°C (total thermal budget not to exceed 245°C for greater than 30 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.

M41T315Y Features

` 3.0V, 3.3V, OR 5V OPERATING VOLTAGE
` REAL TIME CLOCK KEEPS TRACK OF TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAYS, DATE OF THE MONTH, MONTHS, AND YEARS
` AUTOMATIC LEAP YEAR CORRECTION VALID UP TO 2100
` AUTOMATIC SWITCH-OVER AND DESELECT CIRCUITRY
` CHOICE OF POWER-FAIL DESELECT VOLTAGES:
    (V_PFD = Power-fail Deselect Voltage)
    M41T315Y: V_CC = 4.5 to 5.5V
                 4.25V V_PFD 4.50V
    M41T315V: V_CC = 3.0 to 3.6V
                  2.80V V_PFD 2.97V
    M41T315W: V_CC= 2.7 to 3.3V
                    2.60V VPFD 2.70V
` NO ADDRESS SPACE REQUIRED TO COMMUNICATE WITH RTC
` PROVIDES NONVOLATILE SUPERVISOR FUNCTIONS FOR BATTERY BACKUP OF SRAM
` FULL ±10% VCC OPERATING RANGE
` INDUSTRIAL OPERATING TEMPERATURE RANGE (40 to +85 )
` ULTRA-LOW BATTERY SUPPLY CURRENT OF 500nA (max)
` OPTIONAL PACKAGING INCLUDES A 28- LEAD SOIC and SNAPHAT^® TOP (to be ordered separately)
` SNAPHAT PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT TOP,
    WHICH CONTAINS THE BATTERY AND RYSTAL

M41T315Y Connection Diagram

M41T56 General Description

The M41T56 TIMEKEEPER^® is a low power, 512- bit static CMOS RAM organized as 64 words by 8 bits. A built-in 32,768Hz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses and data are transferred serially via a twoline, bi-directional bus. The built-in address register is incremented automatically after each WRITE or READ data byte.

The M41T56 clock has a built-in power sense circuit which detects power failures and automatically switches to the battery supply during power failures. The energy needed to sustain the RAM and clock operations can be supplied from a small lithium coin cell.

Typical data retention time is in excess of 10 years with a 50mAh, 3V lithium cell. The M41T56 is supplied in an 8-lead Plastic SOIC package or a 28- lead SNAPHAT^® package.

The 28-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 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 surfacemounting. The SNAPHAT housing is keyed to prevent reverse insertion. The SOIC and battery/crystal packages are shipped separately in plastic antistatic
tubes or in Tape & Reel form.
For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT) part number is "M4Txx- BR12SH" (see Table 16., page 22).

Caution: Do not place the SNAPHAT battery/crystal package "M4Txx-BR12SH" in conductive foam as this will drain the lithium button-cell battery.

M41T56 Maximum Ratings

Symbol	Parameter		Value	Unit
T_A	Ambient Operating Temperature		40 to 85
T_STG	Storage Temperature (V_CC Off, Oscillator Off)	SNAPHAT	40 to 85
T_STG	Storage Temperature (V_CC Off, Oscillator Off)	SOIC	55 to 125
T_SLD⁽¹⁾	Lead Solder Temperature for 10 seconds		260
V_IO	Input or Output Voltage		0.3 to 7	V
V_CC	Supply Voltage		0.3 to 7	V
I_O	Output Current		20	mA
P_D	Power Dissipation		0.25	W

Note: 1. For SO package, standard (SnPb) lead finish: Reflow at peak temperature of 225 (total thermal budget not to exceed 180 for between 90 to 150 seconds).
2. For SO package, Lead-free (Pb-free) lead finish: Reflow at peak temperature of 260 (total thermal budget not to exceed 245 for greater than 30 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.

M41T56 Features

` 5V ±10% SUPPLY VOLTAGE
` COUNTERS FOR SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEARS, AND CENTURY
` YEAR 2000 COMPLIANT
` SOFTWARE CLOCK CALIBRATION
` AUTOMATIC POWER-FAIL DETECT AND SWITCH CIRCUITRY
` I2C BUS COMPATIBLE
` 56 BYTES OF GENERAL PURPOSE RAM
` ULTRA-LOW BATTERY SUPPLY CURRENT OF 450nA
` LOW OPERATING CURRENT OF 300A
` OPERATING TEMPERATURE OF 40 to 85
` AUTOMATIC LEAP YEAR COMPENSATION
` SPECIAL SOFTWARE PROGRAMMABLE OUTPUT
` PACKAGING OPTIONS INCLUDE:
28-lead SOIC and SNAPHAT^® TOP (to be ordered separately)
SO8

M41T56 Connection Diagram

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