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参数资料
| 型号： | M48T128V-70PM1TR |
| 厂商： | 意法半导体 |
| 元件分类： | SRAM |
| 英文描述： | 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| 中文描述： | 3.3 - 5V的1兆位的SRAM 128KB的x8计时器 |
| 文件页数： | 19/22页 |
| 文件大小： | 340K |
| 代理商： | M48T128V-70PM1TR |
M48T128Y, M48T128V*
6/22
OPERATION MODES
Figure 4., page 5 illustrates the static memory ar-
ray and the quartz controlled clock oscillator. The
clock locations contain the year, month, date, day,
hour, minute, and second in 24 hour BCD format.
Corrections for 28, 29 (leap year - valid until 2100),
30, and 31 day months are made automatically.
Byte 1FFF8h is the clock control register. This byte
controls user access to the clock information and
also stores the clock calibration setting. The seven
clock bytes (1FFFFh - 1FFF8h) are not the actual
clock counters, they are memory locations consist-
ing of BiPORT READ/WRITE memory cells
within the static RAM array. The M48T128Y/V in-
cludes a clock control circuit which updates the
clock bytes with current information once per sec-
ond. The information can be accessed by the user
in the same manner as any other location in the
static memory array. The M48T128Y/V also has its
own Power-Fail Detect circuit. This control circuitry
constantly monitors the supply voltage for an out
of tolerance condition. When VCC is out of toler-
ance, the circuit write protects the TIMEKEEPER
Register data and external SRAM, providing data
security in the midst of unpredictable system oper-
ation. As VCC falls below the Battery Back-up
Switchover Voltage (VSO), the control circuitry au-
tomatically switches to the battery, maintaining
data and clock operation until valid power is re-
stored.
Table 2. Operating Modes
Note: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.
1. See Table 11., page 18 for details.
Mode
VCC
E
G
W
DQ0-DQ7
Power
Deselect
4.5 to 5.5V
or
3.0 to 3.6V
VIH
X
High Z
Standby
WRITE
VIL
X
VIL
DIN
Active
READ
VIL
VIH
DOUT
Active
READ
VIL
VIH
High Z
Active
Deselect
VSO to VPFD (min)
(1)
X
High Z
CMOS Standby
Deselect
≤ VSO(1)
X
High Z
Battery Back-up Mode
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相关代理商/技术参数 |
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|---|---|
| M48T128V-80PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V, 1 Mbit (128 Kb x 8) TIMEKEEPER?? SRAM |
| M48T128V-85PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T128V-85PM1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T128VPM | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T128Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
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