- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄97858 > DS1248YP-70 (MAXIM INTEGRATED PRODUCTS INC) 0 TIMER(S), REAL TIME CLOCK, DMA34 PDF資料下載
參數(shù)資料
| 型號(hào)： | DS1248YP-70 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| 封裝： | POWERCAP, MODULE-34 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 398K |
| 代理商： | DS1248YP-70 |
DS1248/DS1248P 1024k NV SRAM with Phantom Clock
4 of 18
RAM READ MODE
The DS1248 executes a read cycle whenever
WE (write enable) is inactive (high) and CE (chip enable) is
active (low). The unique address specified by the 17 address inputs (A0–A16) defines which of the 128k
bytes of data is to be accessed. Valid data will be available to the eight data-output drivers within tACC
(access time) after the last address input signal is stable, providing that
CE and OE (output enable) access
times and states are also satisfied. If
OE and CE access times are not satisfied, then data access must be
measured from the later occurring signal (
CE or OE) and the limiting parameter is either tCO for CE or tOE
for
OE, rather than address access.
RAM WRITE MODE
The DS1248 is in the write mode whenever the
WE and CE signals are in the active (low) state after
address inputs are stable. The latter occurring falling edge of
CE or WE will determine the start of the
write cycle. The write cycle is terminated by the earlier rising edge of
CEor WE. All address inputs must
be kept valid throughout the write cycle.
WE must return to the high state for a minimum recovery time
(tWR) before another cycle can be initiated. The
OE control signal should be kept inactive (high) during
write cycles to avoid bus contention. However, if the output bus has been enabled (
CE and OE active)
then
WE will disable the outputs in tODW from its falling edge.
DATA RETENTION MODE
The 5V device is fully accessible and data can be written or read only when VCC is greater than VPF.
However, when VCC is below the power-fail point, VPF (point at which write protection occurs), the
internal clock registers and SRAM are blocked from any access. When VCC falls below the battery switch
point, VSO (battery supply level), device power is switched from the VCC pin to the backup battery. RTC
operation and SRAM data are maintained from the battery until VCC is returned to nominal levels.
The 3.3V device is fully accessible and data can be written or read only when VCC is greater than VPF.
When VCC falls below VPF, access to the device is inhibited. If VPF is less than VBAT, the device power is
switched from VCC to the backup supply (VBAT) when VCC drops below VPF. If VPF is greater than VBAT,
the device power is switched from VCC to the backup supply (VBAT) when VCC drops below VBAT. RTC
operation and SRAM data are maintained from the battery until VCC is returned to nominal levels.
All control, data, and address signals must be powered down when VCC is powered-down.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1248W-120 | REAL TIME CLOCK, PDIP32 |
| DS1248WP-120 | REAL TIME CLOCK, DMA34 |
| DS1250ABP-70 | 512K X 8 NON-VOLATILE SRAM MODULE, 70 ns, DMA34 |
| DS1250AB-100 | 512K X 8 NON-VOLATILE SRAM MODULE, 100 ns, DIP32 |
| DS1250Y-100 | 512K X 8 NON-VOLATILE SRAM MODULE, 100 ns, DIP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1248YP-70+ | 功能描述:實(shí)時(shí)時(shí)鐘 1024k NV SRAM w/Phantom Clock 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| DS1248YP70IND | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:1024k NV SRAM with Phantom Clock |
| DS1249AB | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:2048k Nonvolatile SRAM |
| DS1249AB100 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:2048k Nonvolatile SRAM |
| DS1249AB-100 | 功能描述:NVRAM 2048K NV SRAM RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)總線寬度:8 bit 存儲(chǔ)容量:1024 Kbit 組織:128 K x 8 接口類型:Parallel 訪問時(shí)間:70 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 工作電流:85 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 封裝 / 箱體:EDIP 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。