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參數(shù)資料
| 型號： | M48T251Y-70PM1 |
| 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, PDIP32 |
| 封裝： | PLASTIC, MODULE, DIP-32 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大?。?/td> | 366K |
| 代理商： | M48T251Y-70PM1 |
M48T251Y, M48T251V
6/24
OPERATION MODES
Table 2. Operating Modes
Note: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage
1. See Table 12., page 20 for details.
READ
A READ cycle executes whenever WRITE Enable
(WE) is high and Chip Enable (CE) is low (see Fig-
ure 5.). The distinct address defined by the 19 ad-
dress inputs (A0-A18) specifies which of the 512K
bytes of data is to be accessed. Valid data will be
accessed by the eight data output drivers within
the specified Access Time (tACC) after the last ad-
dress input signal is stable, the CE and OE access
times, and their respective parameters are satis-
fied. When CE tACC and OE tACC are not satisfied,
then data access times must be measured from
the more recent CE and OE signals, with the limit-
ing parameter being tCO (for CE) or tOE (for OE) in-
stead of address access.
Figure 5. Memory READ Cycle
Note: WE is high for a READ cycle.
Mode
VCC
CE
OE
WE
DQ7-DQ0
Power
Deselect
4.5V to 5.5V
or
3.0V to 3.6V
VIH
X
High-Z
Standby
WRITE
VIL
X
VIL
DIN
Active
READ
VIL
VIH
DOUT
Active
READ
VIL
VIH
High-Z
Active
Deselect
VSO to VPFD (min)
(1)
X
High-Z
CMOS Standby
Deselect
≤ VSO(1)
X
High-Z
Battery Back-Up
DQ0 - DQ7
ADDRESSES
OE
CE
DATA OUTPUT
VALID
tOD
tODO
tOE
tRC
tCO
tACC
tCOE
tOH
AI04230
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| M48T251Y-70PM1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251Y-85PM1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251Y-85PM1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T251YPM | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM |
| M48T254V-10ZA1 | 功能描述:實時時鐘 16M (2Mx8) 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 |
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