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参数资料
| 型号： | M48T251V-85PM1 |
| 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： | 4/24页 |
| 文件大小： | 366K |
| 代理商： | M48T251V-85PM1 |
M48T251Y, M48T251V
4/24
SUMMARY DESCRIPTION
The M48T251Y/V TIMEKEEPER
RAM is a
512Kbit x 8 non-volatile static RAM and real time
clock organized as 524,288 words by 8 bits. The
special DIP package provides a fully integrated
battery back-up memory and real time clock solu-
tion. In the event of power instability or absence, a
self-contained battery maintains the timekeeping
operation and provides power for a CMOS static
RAM. Control circuitry monitors V
CC
and invokes
write protection to prevent data corruption in the
memory and RTC.
The clock keeps track of tenths/hundredths of sec-
onds, 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 M48T251Y/V is a 32-pin (PM) DIP module
that integrates the RTC, the battery, and SRAM in
one package.
The modules are shipped in plastic, anti-static
tubes (see
Table 14., page 22
).
Figure 2. Logic Diagram
Table 1. Signal Names
A0-A18
VSS
DQ0-D7
M48T251Y
M48T251V
VCC
RST
WE
OE
CE
AI04237
A0–A18
Address Input
RST
Reset Input
CE
Chip Enable
OE
Output Enable Input
WE
WRITE Enable Input
DQ0–DQ7
Data Inputs/Outputs
V
CC
Supply Voltage Input
V
SS
Ground
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| M48T35YSH | Hook-Up Wire; Conductor Size AWG:24; No. Strands x Strand Size:Solid; Jacket Color:Red; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| M48T251Y-70PM1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
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