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参数资料
| 型号： | M48T212Y-70MH1TR |
| 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, PLASTIC, SOH-44 |
| 文件页数： | 2/32页 |
| 文件大小： | 473K |
| 代理商： | M48T212Y-70MH1TR |
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M48T212Y, M48T212V
10/32
READ Mode
The M48T212Y/V executes a READ cycle when-
ever W (WRITE Enable) is high and E (Chip En-
able) is low. The unique address specified by the
address inputs (A3-A0) defines which one of the
on-chip TIMEKEEPER registers is to be access-
ed.
When
the
address
presented
to
the
M48T212Y/V is in the range of 0h-Fh, 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 EX input is low, an external SRAM location
will be selected.
Note: Care should be taken to avoid taking both E
and EX low simultaneously to avoid bus conten-
tion.
Figure 6. READ Cycle Timing: RTC Control Signal Waveforms
Note: EX is assumed High.
Table 5. READ Mode AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C or –40 to 85°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
2. CL = 5pF.
Symbol
Parameter(1)
M48T212Y
M48T212V
Unit
–70
–85
Min
Max
Min
Max
tAVAV
Read Cycle Time
70
85
ns
tAVQV
Address Valid to Output Valid
70
85
ns
tELQV
Chip Enable Low to Output Valid
70
85
ns
tGLQV
Output Enable Low to Output Valid
25
35
ns
tELQX
(2)
Chip Enable Low to Output Transition
5
ns
tGLQX
(2)
Output Enable Low to Output Transition
0
ns
tEHQZ
(2)
Chip Enable High to Output Hi-Z
20
25
ns
tGHQZ
(2)
Output Enable High to Output Hi-Z
20
25
ns
tAXQX
Address Transition to Output Transition
5
ns
AI02640
W
DQ7-DQ0
G
DATA OUT
VALID
ADDRESS
tAVAV
E
tELQV
tAVAV
READ
WRITE
DATA IN
VALID
DATA OUT
VALID
tAVQV
tWHAX
tAVWL
tELQX
tGLQV
tGHQZ
tWLWH
tAXQX
tGLQX
相关PDF资料 |
PDF描述 |
|---|---|
| M48T212Y-70MH1F | REAL TIME CLOCK, PDSO44 |
| M48T212Y-70MH1 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-85MH6E | REAL TIME CLOCK, PDSO44 |
| M48T212V-85MH6F | REAL TIME CLOCK, PDSO44 |
| M48T212Y-70MH6 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212Y-70MH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-70MH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212Y-70MH6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212Y-70MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-85MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
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