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參數(shù)資料
| 型號： | M48T201Y-70MH1F |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封裝： | SNAPHAT, ROHS COMPLIANT, PLASTIC, SOIC-44 |
| 文件頁數(shù)： | 3/37頁 |
| 文件大?。?/td> | 311K |
| 代理商： | M48T201Y-70MH1F |
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M48T201Y, M48T201V
Operation
Table 2.
Operating modes
Note:
X = VIH or VIL; VSO = battery backup switchover voltage
2.2
Read mode
The M48T201Y/V executes a READ cycle whenever W (WRITE enable) is high and E (chip
enable) is low. The unique address specified by the address inputs (A0-A18) defines which
one of the on-chip TIMEKEEPER registers or external SRAM locations is to be accessed.
When the address presented to the M48T201Y/V is in the range of 7FFFFh-7FFF0h, one of
the on-board TIMEKEEPER registers is accessed and valid data will be available to the
eight data output drivers within tAVQV after the address input signal is stable, providing that
the E and G access times are also satisfied. If they are not, then data access must be
measured from the latter occurring signal (E or G) and the limiting parameter is either tELQV
for E or tGLQV for G rather than the address access time. When one of the on-chip
TIMEKEEPER registers is selected for READ, the GCON signal will remain inactive
throughout the READ cycle.
When the address value presented to the M48T201Y/V is outside the range of
TIMEKEEPER registers, an external SRAM location will be selected. In this case the G
signal will be passed to the GCON pin, with the specified delay times of tAOEL or tOERL.
Figure 4.
GCON timing when switching between RTC and external SRAM
Mode
VCC
EG
W
DQ7-
DQ0
Power
Deselect
4.5 V to 5.5 V
or
3.0 V 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 14 on page 30 for details.
X
High-Z
CMOS standby
Deselect
≤ VSO(1)
X
High-Z
Battery backup
AI02333
G
E
GCON
tAOEL
ADDRESS
00000h - 7FFEFh
7FFF0h - 7FFFFh
00000h - 7FFEFh
7FFF0h - 7FFFFh
tAOEH
tOERL
tRO
External SRAM
RTC
External SRAM
RTC
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| M48T201Y-70MH1 | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M48T201Y-70MH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V TIMEKEEPER㈢ supervisor |
| M48T201Y-80MH1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
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