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參數(shù)資料
| 型號(hào)： | M48T18-100MH1TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封裝： | SNAPHAT, PLASTIC, SO-28 |
| 文件頁數(shù)： | 29/29頁 |
| 文件大小： | 184K |
| 代理商： | M48T18-100MH1TR |
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M48T08, M48T18
OPERATION MODES
As Figure 6, page 5 shows, the static memory ar-
ray and the quartz-controlled clock oscillator of the
M48T08/18 are integrated on one silicon chip. The
two circuits are interconnected at the upper eight
memory locations to provide user accessible
BYTEWIDE clock information in the bytes with
addresses 1FF8h-1FFFh.
The clock locations contain the year, month, date,
day, hour, minute, and second in 24 hour BCD for-
mat. Corrections for 28, 29 (leap year - valid until
2100), 30, and 31 day months are made automat-
ically. Byte 1FF8h is the clock control register. This
byte controls user access to the clock information
and also stores the clock calibration setting.
The eight clock bytes are not the actual clock
counters themselves; they are memory locations
consisting of BiPORT READ/WRITE memory
cells. The M48T08/18 includes a clock control cir-
cuit which updates the clock bytes with current in-
formation 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 M48T08/18 also has its own Power-fail Detect
circuit. The control circuitry constantly monitors
the single 5V supply for an out of tolerance condi-
tion. 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 be-
low the Battery Back-up Switchover Voltage
(VSO), the control circuitry connects the battery
which maintains data and clock operation until val-
id power returns.
Table 6. Operating Modes
Note: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.
1. See Table 10, page 16 for details.
Mode
VCC
E1
E2
G
W
DQ0-DQ7
Power
Deselect
4.75 to 5.5V
or
4.5 to 5.5V
VIH
X
High Z
Standby
Deselect
X
VIL
X
High Z
Standby
WRITE
VIL
VIH
X
VIL
DIN
Active
READ
VIL
VIH
VIL
VIH
DOUT
Active
READ
VIL
VIH
High Z
Active
Deselect
VSO to VPFD(min)
(1)
XXXX
High Z
CMOS Standby
Deselect
≤ VSO(1)
XXXX
High Z
Battery Back-up Mode
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M48T18-100MH1 | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M48T18-150PC1 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| M48T08-100PC1 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| M48T08-150PC1 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| M48T18-100PC1 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T18-100PC1 | 功能描述:實(shí)時(shí)時(shí)鐘 64K (8Kx8) 100ns RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M48T18-100PC1 | 制造商:STMicroelectronics 功能描述:SRAM TIMEKEEPER 64K 48T18 DIP28 |
| M48T18-100PC1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
| M48T18-100PC1F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
| M48T18-100PC1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CMOS 8K x 8 TIMEKEEPER SRAM |
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