M41AF, M41C4000CZ-6, M41ST84W Selling Leads, Datasheet
MFG:ST Package Cooled:DIP8 D/C:00+
M41AF, M41C4000CZ-6, M41ST84W Datasheet download
Part Number: M41AF
MFG: ST
Package Cooled: DIP8
D/C: 00+
M41AF, M41C4000CZ-6, M41ST84W
- Table of contents:
Info of M41AF
Info of M41C4000CZ-6
Info of M41ST84W
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About M41256CN-10B
PDF/DataSheet Download
Datasheet: M41256CN-10B
File Size: 1442145 KB
Manufacturer: ETC [ETC]
Download : Click here to Download
About M41256CN-10B
PDF/DataSheet Download
Datasheet: M41256CN-10B
File Size: 1442145 KB
Manufacturer: ETC [ETC]
Download : Click here to Download
About M41ST84W
PDF/DataSheet Download
Datasheet: M41ST84W
File Size: 463039 KB
Manufacturer: STMICROELECTRONICS [STMicroelectronics]
Download : Click here to Download
M41ST84W General Description
The M41ST84Y/W Serial supervisory TIMEKEEPER ® 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 9, page 16) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 bytes of RAM provide status/control of Alarm, Watchdog and Square Wave functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.
The M41ST84Y/W has a built-in power sense circuit which detects power failures and automatically 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 failure 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 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 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 20, page 29). Caution: Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the lithium button-cell battery.
M41ST84W Maximum Ratings
|
Symbol |
Parameter |
Value |
Unit | |
|
TSTG |
Storage Temperature (VCC Off, Oscillator Off) | SNAPHAT® |
40 to 85 |
|
| SOIC |
55 to 125 |
|||
|
TSLD(1) |
Lead Solder Temperature for 10 seconds |
260 |
||
|
VIO |
Input or Output Voltages |
0.3 to VCC +0.3 |
V | |
|
VCC |
Supply Voltage | M41ST84Y |
0.3 to 7 |
V |
| M41ST84W |
0.3 to 4.6 |
V | ||
|
IO |
Output Current |
20 |
mA | |
|
PD |
Power Dissipation |
1 |
W | |
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.
M41ST84W Features
` 5.0 OR 3.0V OPERATING VOLTAGE
` SERIAL INTERFACE SUPPORTS I2C BUS (400 KHz)
` OPTIMIZED FOR MINIMAL INTERCONNECT TO MCU
` 2.5 TO 5.5V OSCILLATOR OPERATING VOLTAGE
` AUTOMATIC SWITCH-OVER and DESELECT CIRCUITRY
` CHOICE OF POWER-FAIL DESELECT VOLTAGES:
M41ST84Y: VCC = 4.5 to 5.5V; 4.20V VPFD 4.50V
M41ST84W: VCC = 2.7 to 3.6V; 2.55V VPFD 2.70V
` 1.25V REFERENCE (for PFI/PFO)
` COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, and
CENTURY
` 44 BYTES OF GENERAL PURPOSE RAM
` PROGRAMMABLE ALARM and INTERRUPT
FUNCTION (VALID EVEN DURING BATTERY BACK-UP MODE)
` WATCHDOG TIMER
` MICROPROCESSOR POWER-ON RESET
` BATTERY LOW FLAG
` ULTRA-LOW BATTERY SUPPLY CURRENT OF 500 nA (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 CRYSTAL
` SERIAL INTERFACE SUPPORTS I2C BUS (400 KHz)
` OPTIMIZED FOR MINIMAL INTERCONNECT TO MCU
` 2.5 TO 5.5V OSCILLATOR OPERATING VOLTAGE
` AUTOMATIC SWITCH-OVER and DESELECT CIRCUITRY
` CHOICE OF POWER-FAIL DESELECT VOLTAGES:
M41ST84Y: VCC = 4.5 to 5.5V; 4.20V VPFD 4.50V
M41ST84W: VCC = 2.7 to 3.6V; 2.55V VPFD 2.70V
` 1.25V REFERENCE (for PFI/PFO)
` COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, and
CENTURY
` 44 BYTES OF GENERAL PURPOSE RAM
` PROGRAMMABLE ALARM and INTERRUPT
FUNCTION (VALID EVEN DURING BATTERY BACK-UP MODE)
` WATCHDOG TIMER
` MICROPROCESSOR POWER-ON RESET
` BATTERY LOW FLAG
` ULTRA-LOW BATTERY SUPPLY CURRENT OF 500 nA (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 CRYSTAL
M41ST84W Connection Diagram
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