- 您现在的位置：买卖IC网 > PDF目录359066 > M48T512YPM (意法半导体) 3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM PDF资料下载
参数资料
| 型号： | M48T512YPM |
| 厂商： | 意法半导体 |
| 英文描述： | 3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| 中文描述： | 3.3 - 5V的4兆位的SRAM 512KB的x8计时器 |
| 文件页数： | 7/14页 |
| 文件大小： | 104K |
| 代理商： | M48T512YPM |
7/14
M48T512Y, M48T512V
Table 9. Read Mode AC Characteristics
(T
A
= 0 to 70 °C)
Note: 1. C
L
= 100pF.
2. C
L
= 5pF.
Symbol
Parameter
M48T512Y
M48T512V
Unit
-70
-85
Min
Max
Min
Max
t
AVAV
Read Cycle Time
70
85
ns
t
AVQV
(1)
Address Valid to Output Valid
70
85
ns
t
ELQV
(1)
Chip Enable Low to Output Valid
70
85
ns
t
GLQV
(1)
Output Enable Low to Output Valid
40
55
ns
t
ELQX
(2)
Chip Enable Low to Output Transition
5
5
ns
t
GLQX
(2)
Output Enable Low to Output Transition
5
5
ns
t
EHQZ
(2)
Chip Enable High to Output Hi-Z
25
30
ns
t
GHQZ
(2)
Output Enable High to Output Hi-Z
25
30
ns
t
AXQX
(1)
Address Transition to Output Transition
10
5
ns
Figure 6. Address Controlled, Read Mode AC Waveforms
AI02324
tAVAV
tAVQV
tAXQX
DATA VALID
A0-A16
DQ0-DQ7
VALID
DATA VALID
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 registers. The user can then load
them with the correct day, date, and time data in
24 hour BCD format (see Table 11). Resetting the
WRITE bit to a '0' then transfers the values of all
time registers 7FFFFh-7FFF9h to the actual TIME-
KEEPER counters and allows normal operation to
resume. After the WRITE bit is reset, the next
clock update will occur approximately one second
later. See Application Note, AN923, (TIMEKEEP-
ERS "ROLLING INTO" THE 21ST CENTURY) on
the ST Web Site for more information on Century
Rollover.
Note:
Upon power-up, both the WRITE bit and the
READ bit will be reset to '0'.
Stopping and Starting the Oscillator.
The os-
cillator 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 locat-
ed at Bit D7 within 7FFF9h. Setting it to a '1' stops
the oscillator. The M48T512Y/V is shipped from
STMicroelectronics with the STOP bit set to a '1'.
When reset to a '0', the M48T512Y/V oscillator
starts after approximately 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).
相关PDF资料 |
PDF描述 |
|---|---|
| M48T513VPM | 3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513V-70CS1 | 3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513V-70PM1 | 3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513V-85CS1 | 3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513V-85PM1 | 3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T513V | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513V-70CS1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513V-70PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513V-85CS1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513V-85PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
发布紧急采购，3分钟左右您将得到回复。