- 您现在的位置：买卖IC网 > PDF目录45051 > M48T513Y-85CS1 (STMICROELECTRONICS) 0 TIMER(S), REAL TIME CLOCK, PDSO32 PDF资料下载
参数资料
| 型号： | M48T513Y-85CS1 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO32 |
| 封装： | SNAPHAT, PLASTIC, SO-44 |
| 文件页数： | 8/31页 |
| 文件大小： | 168K |
| 代理商： | M48T513Y-85CS1 |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
M48T513Y, M48T513V
16/31
Table 10. Power Down/Up Trip Points DC Characteristics
Note: 1. Valid for Ambient Operating Temperature: TA =0 to 70°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
2. All voltages referenced to VSS.
3. At 25
°C.
CLOCK OPERATIONS
TIMEKEEPER Registers
The M48T513Y/V offers 16 internal registers
which contain TIMEKEEPER, Alarm, Watchdog,
Interrupt, Flag, and Control data (see Table 11,
page 17). These registers are memory locations
which contain external (user accessible) and inter-
nal copies of the data (usually referred to as Bi-
PORT
TIMEKEEPER cells). The external
copies are independent of internal functions ex-
cept that they are updated periodically by the si-
multaneous transfer of the incremented internal
copy. TIMEKEEPER and Alarm Registers store
data in BCD.
Reading the Clock
Updates to the TIMEKEEPER registers should
be halted before clock data is read to prevent
reading data in transition. The BiPORT
TIME-
KEEPER cells in the RAM array are only data reg-
isters and not the actual clock counters, so
updating the registers can be halted without dis-
turbing the clock itself.
Updating is halted when a ’1’ is written to the
READ Bit, D6 in the Control Register (7FFF8h). As
long as a ’1’ remains in that position, updating is
halted. After a halt is issued, the registers reflect
the count; that is, the day, date, and time that were
current at the moment the halt command was is-
sued. All of the TIMEKEEPER registers are updat-
ed simultaneously. A halt will not interrupt an
update in progress. Updating occurs 1 second af-
ter the READ Bit is reset to a ’0.’
Setting the Clock
Bit D7 of the Control Register (7FFF8h) is the
WRITE Bit. Setting the WRITE Bit to a ’1’, like the
READ Bit, halts updates to the TIMEKEEPER reg-
isters. The user can then load them with the cor-
rect day, date, and time data in 24 hour BCD
format (see Table Figure 11, page 17).
Resetting the WRITE Bit to a ’0’ then transfers the
values of all time registers (7FFFFh-7FFF9h,
7FFF1h) to the actual TIMEKEEPER counters and
allows normal operation to resume. After the
WRITE Bit is reset, the next clock update will occur
approximately one second later.
Note: Upon power-up following a power failure,
both the WRITE Bit and the READ Bit will be reset
to ’0.’
Stopping and Starting the Oscillator
The oscillator may be stopped at any time. If the
device is going to spend a significant amount of
time on the shelf, the oscillator can be turned off to
minimize current drain on the battery. The STOP
Bit is located at Bit D7 within 7FFF9h. Setting it to
a ’1’ stops the oscillator. When reset to a ’0,’ the
M48T513Y/V oscillator starts within one second.
Note: It is not necessary to set the WRITE Bit
when setting or resetting the FREQUENCY TEST
Bit (FT) or the STOP Bit (ST).
Symbol
Parameter(1,2)
Min
Typ
Max
Unit
VPFD
Power-fail Deselect Voltage
M48T513Y
4.2
4.35
4.5
V
M48T513V
2.7
2.9
3.0
V
VSO
Batter y Back-up Switchover Voltage
M48T513Y
3.0
V
M48T513V
VPFD –100mV
tDR
(3)
Expected Data Retention Time
10
YEARS
相关PDF资料 |
PDF描述 |
|---|---|
| M48T559YMH1F | REAL TIME CLOCK, PDSO28 |
| M48T559YMH1 | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M48T58-70PC1 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| M48T58Y-70MH1E | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M48T58Y-70PC1TR | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T513Y-85PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513YPM | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513YSH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T559 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
| M48T559Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
发布紧急采购，3分钟左右您将得到回复。