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參數(shù)資料
| 型號： | M48T129V-70CS1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO32 |
| 封裝： | 8 X 20 MM, PLASTIC, TSOP-32 |
| 文件頁數(shù)： | 2/22頁 |
| 文件大?。?/td> | 140K |
| 代理商： | M48T129V-70CS1 |
M48T129Y, M48T129V
10/22
Table 10. Write Mode AC Characteristics
(TA = 0 to 70 °C)
Note: 1. CL = 5pF.
2. If E goes low simultaneously with W going low, the outputs remain in the high impedance state.
Symbol
Parameter
M48T129Y
M48T129V
Unit
-70
-85
Min
Max
Min
Max
tAVAV
Write Cycle Time
70
85
ns
tAVWL
Address Valid to Write Enable Low
0
ns
tAVEL
Address Valid to Chip Enable Low
0
ns
tWLWH
Write Enable Pulse Width
50
60
ns
tELEH
Chip Enable Low to Chip Enable High
55
65
ns
tWHAX
Write Enable High to Address Transition
5
ns
tEHAX
Chip Enable High to Address Transition
10
15
ns
tDVWH
Input Valid to Write Enable High
30
35
ns
tDVEH
Input Valid to Chip Enable High
30
35
ns
tWHDX
Write Enable High to Input Transition
5
ns
tEHDX
Chip Enable High to Input Transition
10
15
ns
tWLQZ
(1, 2)
Write Enable Low to Output Hi-Z
25
30
ns
tAVWH
Address Valid to Write Enable High
60
70
ns
tAVEH
Address Valid to Chip Enable High
60
70
ns
tWHQX
(1, 2)
Write Enable High to Output Transition
5
ns
WATCHDOG TIMER
The watchdog timer can be used to detect an out-
of-control microprocessor. The user programs the
watchdog timer by setting the desired amount of
time-out into the Watchdog Register, address
1FFF7h. Bits BMB4-BMB0 store a binary multiplier
and the two lower order bits RB1-RB0 select the
resolution, where 00 = 1/16 second, 01 = 1/4 sec-
ond, 10 = 1 second, and 11 = 4 seconds. The
amount of time-out is then determined to be the
multiplication of the five bit multiplier value with the
resolution. (For example: writing 00001110 in the
Watchdog Register = 3*1 or 3 seconds).
Note: Accuracy of timer is within
± the selected
resolution.
If the processor does not reset the timer within the
specified period, the M48T129Y/V sets the WDF
(Watchdog Flag) and generates a watchdog inter-
rupt or a microprocessor reset. WDF is reset by
reading the Flags Register (Address 1FFF0h). The
most significant bit of the Watchdog Register is the
Watchdog Steering Bit (WDS). When set to a ’0’,
the watchdog will activate the IRQ/FT pin when
timed-out. When WDS is set to a ’1’, the watchdog
will output a negative pulse on the RST pin for 40
to 200 ms. The Watchdog register and the FT bit
will reset to a ’0’ at the end of a Watchdog time-out
when the WDS bit is set to a ’1’. The watchdog tim-
er can be reset by having the original time-out pe-
riod
re-written into
the Watchdog Register,
effectively restarting the count-down cycle.
Should the watchdog timer time-out, and the WDS
bit is programmed to output an interrupt, a value of
00h needs to be written to the Watchdog Register
in order to clear the IRQ/FT pin. This will also dis-
able the watchdog function until it is again pro-
grammed correctly. A read of the Flags Register
will reset the Watchdog Flag (Bit D7; Register
1FFF0h). The watchdog function is automatically
disabled upon power-down and the Watchdog
Register is cleared. If the watchdog function is set
to output to the IRQ/FT pin and the frequency test
function is activated, the watchdog or alarm func-
tion prevails and the frequency test function is de-
nied.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| M48T129V-70PM1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER SRAM |
| M48T129V-85CS1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T129V-85PM1 | 功能描述:實(shí)時時鐘 1M (128Kx8) 85ns 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| M48T129VPM | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T129VSH | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
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