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参数资料
| 型号： | M48T251V-70PM1TR |
| 厂商： | 意法半导体 |
| 英文描述： | 5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| 中文描述： | 5.0或3.3V，4096K与幻象计时器的SRAM |
| 文件页数： | 6/24页 |
| 文件大小： | 366K |
| 代理商： | M48T251V-70PM1TR |
M48T251Y, M48T251V
6/24
OPERATION MODES
Table 2. Operating Modes
Note: X = V
IH
or V
IL
; V
SO
= Battery Back-up Switchover Voltage
1. See
Table 12., page 20
for details.
READ
A READ cycle executes whenever WRITE Enable
(WE) is high and Chip Enable (CE) is low (see
Fig-
ure 5.
). The distinct address defined by the 19 ad-
dress inputs (A0-A18) specifies which of the 512K
bytes of data is to be accessed. Valid data will be
accessed by the eight data output drivers within
the specified Access Time (t
ACC
) after the last ad-
dress input signal is stable, the CE and OE access
times, and their respective parameters are satis-
fied. When CE t
ACC
and OE t
ACC
are not satisfied,
then data access times must be measured from
the more recent CE and OE signals, with the limit-
ing parameter being t
CO
(for CE) or t
OE
(for OE) in-
stead of address access.
Figure 5. Memory READ Cycle
Note: WE is high for a READ cycle.
Mode
V
CC
CE
OE
WE
DQ7-DQ0
Power
Deselect
4.5V to 5.5V
or
3.0V to 3.6V
V
IH
X
X
High-Z
Standby
WRITE
V
IL
X
V
IL
D
IN
Active
READ
V
IL
V
IL
V
IH
D
OUT
Active
READ
V
IL
V
IH
V
IH
High-Z
Active
Deselect
V
SO
to V
PFD
(min)
(1)
X
X
X
High-Z
CMOS Standby
Deselect
≤
V
SO(1)
X
X
X
High-Z
Battery Back-Up
DQ0 - DQ7
ADDRESSES
OE
CE
DATA OUTPUT
VALID
tOD
tODO
tOE
tRC
tCO
tACC
tCOE
tCOE
tOH
AI04230
相关PDF资料 |
PDF描述 |
|---|---|
| M48T251V-85PM1 | 5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251V-85PM1TR | 5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251V | 5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251VPM | 5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T35AYMH | ER 5C 5#16 PIN PLUG |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T251V-85PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251V-85PM1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251VPM | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251Y-70PM1 | 功能描述:实时时钟 4M (512Kx8) 70ns RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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