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參數(shù)資料
| 型號(hào)： | M27C256B-15C3TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | PROM |
| 英文描述： | 32K X 8 OTPROM, 150 ns, PQCC32 |
| 封裝： | LEAD FREE, PLASTIC, LCC-32 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大小： | 205K |
| 代理商： | M27C256B-15C3TR |
Device operation
M27C256B
2
Device operation
The operating modes of the M27C256B are listed in the Operating Modes. A single power
supply is required in the read mode. All inputs are TTL levels except for VPP and 12V on A9
for Electronic Signature.
2.1
Read mode
The M27C256B has two control functions, both of which must be logically active in order to
obtain data at the outputs. Chip Enable (E) is the power control and should be used for
device selection. Output Enable (G) is the output control and should be used to gate data to
the output pins, independent of device selection. Assuming that the addresses are stable,
the address access time (tAVQV) is equal to the delay from E to output (tELQV). Data is
available at the output after delay of tGLQV from the falling edge of G, assuming that E has
been low and the addresses have been stable for at least tAVQV-tGLQV.
2.2
Standby mode
The M27C256B has a standby mode which reduces the supply current from 30mA to
100A. The M27C256B is placed in the standby mode by applying a CMOS high signal to
the E input. When in the standby mode, the outputs are in a high impedance state,
independent of the G input.
2.3
Two-line output control
Because EPROMs are usually used in larger memory arrays, this product features a 2 line
control function which accommodates the use of multiple memory connection. The two line
control function allows:
●
the lowest possible memory power dissipation,
●
complete assurance that output bus contention will not occur.
For the most efficient use of these two control lines, E should be decoded and used as the
primary device selecting function, while G should be made a common connection to all
devices in the array and connected to the READ line from the system control bus. This
ensures that all deselected memory devices are in their low power standby mode and that
the output pins are only active when data is desired from a particular memory device.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M27C256B-15C6 | 功能描述:可擦除可編程ROM 256K (32KX8) 150ns RoHS:否 制造商:Maxim Integrated 類型: 存儲(chǔ)容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-92 |
| M27C256B15F1 | 制造商:STMicroelectronics 功能描述:IC EPROM 256KBIT 150NS DIP-28 |
| M27C256B-15F1 | 功能描述:可擦除可編程ROM 256K (32KX8) 150ns RoHS:否 制造商:Maxim Integrated 類型: 存儲(chǔ)容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-92 |
| M27C256B-15F1 | 制造商:STMicroelectronics 功能描述:IC EPROM CMOS 256K 27C256 DIP28 |
| M27C256B-15F6 | 功能描述:可擦除可編程ROM 256K (32KX8) 150ns RoHS:否 制造商:Maxim Integrated 類型: 存儲(chǔ)容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-92 |
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