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参数资料
| 型号： | M48T37V-10MH1TR |
| 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, PDSO44 |
| 封装： | 0.330 INCH, ROHS COMPLIANT, PLASTIC, SOH-44 |
| 文件页数： | 29/30页 |
| 文件大小： | 515K |
| 代理商： | M48T37V-10MH1TR |
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Operation modes
M48T37Y, M48T37V
Doc ID 7019 Rev 9
2
Operation modes
As Figure 3 on page 7 shows, the static memory array and the quartz controlled clock
oscillator of the M48T37Y/V are integrated on one silicon chip. The memory locations that
provide user accessible BYTEWIDE clock information are in the bytes with addresses
7FF1 and 7FF9h-7FFFh (located in Table 5 on page 13). The clock locations contain the
century, year, month, date, day, hour, minute, and second in 24-hour BCD format.
Corrections for 28, 29 (leap year - valid until the year 2100), 30, and 31 day months are
made automatically.
Byte 7FF8h is the clock control register. This byte controls user access to the clock
information and also stores the clock calibration setting.
Byte 7FF7h contains the watchdog timer setting. The watchdog timer redirects an out-of-
control microprocessor and provides a reset or interrupt to it. Bytes 7FF2h-7FF5h are
reserved for clock alarm programming. These bytes can be used to set the alarm. This will
generate an active low signal on the IRQ/FT pin when the alarm bytes match the date,
hours, minutes, and seconds of the clock. The eight clock bytes are not the actual clock
counters themselves; they are memory locations consisting of BiPORT READ/WRITE
memory cells. The M48T37Y/V includes a clock control circuit which updates the clock bytes
with current information once per second. The information can be accessed by the user in
the same manner as any other location in the static memory array.
The M48T37Y/V also has its own power-fail detect circuit. The control circuitry constantly
monitors the single VCC supply for an out of tolerance condition. When VCC is out of
tolerance, the circuit write protects the SRAM, providing a high degree of data security in the
midst of unpredictable system operation brought on by low VCC. As VCC falls below the
battery backup switchover voltage (VSO), the control circuitry connects the battery which
maintains data and clock operation until valid power returns.
Table 2.
Operating modes
Note:
X = VIH or VIL; VSO = Battery backup switchover voltage.
2.1
READ mode
The M48T37Y/V is in the READ mode whenever WRITE enable (W) is high and chip enable
(E) is low. The unique address specified by the 15 address inputs defines which one of the
32,752 bytes of data is to be accessed. Valid data will be available at the data I/O pins within
address access time (tAVQV) after the last address input signal is stable, providing that the E
and output enable (G) access times are also satisfied. If the E and G access times are not
Mode
VCC
E
G
W
DQ0-DQ7
Power
Deselect
4.5 to 5.5 V
or
3.0 to 3.6 V
VIH
X
High Z
Standby
WRITE
VIL
XVIL
DIN
Active
READ
VIL
VIH
DOUT
Active
READ
VIL
VIH
High Z
Active
Deselect
VSO to VPFD (min)
(1)
1.
See Table on page 23 for details.
X
High Z
CMOS standby
Deselect
≤ VSO(1)
X
High Z
Battery backup mode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T37V-10MH6 | 功能描述:实时时钟 256K (32Kx8) 100ns 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 |
| M48T37V-10MH6E | 功能描述:实时时钟 256K (32Kx8) 100ns 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 |
| M48T37V-10MH6F | 功能描述:实时时钟 256K (32Kx8) 100ns 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 |
| M48T37V-10MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| M48T37V-70MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
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