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参数资料
| 型号： | M48T212A-85MH6TR |
| 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： | HATLESS, PLASTIC, SOIC-44 |
| 文件页数： | 6/30页 |
| 文件大小： | 155K |
| 代理商： | M48T212A-85MH6TR |
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M48T212A
14/30
WRITE Mode
The M48T212A is in the WRITE Mode whenever
W (WRITE Enable) and E (Chip Enable) are in a
low state after the address inputs are stable. The
start of a WRITE is referenced from the latter oc-
curring falling edge of W or E. A WRITE is termi-
nated by the earlier rising edge of W or E. The
addresses must be held valid throughout the cy-
cle. E or W must return high for a minimum of tE-
HAX from Chip Enable or tWHAX from WRITE
Enable prior to the initiation of another READ or
WRITE cycle. Data-in must be valid tDVWH prior to
the end of WRITE and remain valid for tWHDX af-
terward.
G should be kept high during WRITE cycles to
avoid bus contention; although, if the output bus
has been activated by a low on E and G a low on
W will disable the outputs tWLQZ after W falls.
When E is low during the WRITE, one of the on-
board TIMEKEEPER registers will be selected
and data will be written into the device. When EX
is low (and E is high) an external SRAM location is
selected.
Note: Care should be taken to avoid taking both E
and EX low simultaneously to avoid bus conten-
tion.
Figure 8. WRITE Cycle Timing: RTC Control Signal Waveforms
Note: EX is assumed High.
AI02641
W
DQ0-DQ7
G
DATA IN
VALID
ADDRESS
tAVAV
E
tAVEH
tAVAV
WRITE
READ
DATA OUT
VALID
DATA OUT
VALID
tAVWH
tAVQV
tWLWH
tWHDX
tWHAX
tWHQX
tWLQZ
tDVWH
tGLQV
tEHQZ
tDVEH
DATA IN
VALID
tELEH
tEHAX
tAVEL
tEHDX
tAVWL
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212AMH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER CONTROLLER |
| M48T212V | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER supervisor |
| M48T212V_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER supervisor |
| M48T212V-70MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-70MH1E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
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