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参数资料
| 型号： | M41ST87WMX6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOX-28 |
| 文件页数： | 9/52页 |
| 文件大小： | 689K |
| 代理商： | M41ST87WMX6 |
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M41ST87Y, M41ST87W
Operating modes
Doc ID 9497 Rev 8
2.3
WRITE mode
In this mode the master transmitter transmits to the M41ST87Y/W slave receiver. Bus
protocol is shown in Figure 12. Following the START condition and slave address, a logic '0'
(R/W = 0) is placed on the bus and indicates to the addressed device that word address An
will follow and is to be written to the on-chip address pointer. The data word to be written to
the memory is strobed in next and the internal address pointer is incremented to the next
memory location within the RAM on the reception of an acknowledge clock. The
M41ST87Y/W slave receiver will send an acknowledge clock to the master transmitter after
it has received the slave address (see Figure 9 on page 16) and again after it has received
the word address and each data byte.
Figure 12.
WRITE mode sequence
Figure 13.
WRITE cycle timing: RTC & external SRAM control signals
1.
Available in SOX28 (MX) package only.
2.4
Data retention mode
With valid VCC applied, the M41ST87Y/W can be accessed as described above with READ
or WRITE cycles. Should the supply voltage decay, the M41ST87Y/W will automatically
deselect, write protecting itself (and any external SRAM) when VCC falls between VPFD
accomplished by internally inhibiting access to the clock registers. At this time, the reset pin
(RST) is driven active and will remain active until VCC returns to nominal levels. External
RAM access is inhibited in a similar manner by forcing ECON to a high level. This level is
within 0.2 volts of the VBAT. ECON will remain at this level as long as VCC remains at an out-
of-tolerance condition. When VCC falls below the battery backup switchover voltage (VSO),
AI00591
BUS ACTIVITY:
AC
K
S
AC
K
AC
K
AC
K
AC
K
ST
OP
ST
AR
T
P
SDA LINE
BUS ACTIVITY:
MASTER
R/W
DATA n
DATA n+1
DATA n+X
WORD
ADDRESS (An)
SLAVE
ADDRESS
AI03663
EX
(1)
ECON
(1)
tEXPD
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M41ST87WMX6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM |
| M41ST87WMX6TR | 功能描述:实时时钟 Serial 1280 (160x8) 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 |
| M41ST87WSS6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM |
| M41ST87WSS6F | 功能描述:实时时钟 128 NVRAM Serial RTC 3.0 to 3.6 Vcc 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 |
| M41ST87Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC and NVRAM Supervisor with Tamper Detection |
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