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參數(shù)資料
| 型號(hào)： | M27C64A-15F6 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 64 Kbit (8Kb x8) UV EPROM and OTP EPROM |
| 中文描述： | 64千位（8KB的× 8）紫外線存儲(chǔ)器和OTP存儲(chǔ)器 |
| 文件頁數(shù)： | 8/22頁 |
| 文件大?。?/td> | 124K |
| 代理商： | M27C64A-15F6 |
Device operation
M27C64A
8/22
2
Device operation
The modes of operation of the M27C64A are listed in the Operating Modes table. A single
power supply is required in the read mode. All inputs are TTL levels except for V
PP
and 12V
on A9 for Electronic Signature.
2.1
Read mode
The M27C64A 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 (t
AVQV
) is equal to the delay from E to output (t
ELQV
). Data is
available at the output after a delay of t
GLQV
from the falling edge of G, assuming that E has
been low and the addresses have been stable for at least t
AVQV
-t
GLQV
.
2.2
Standby mode
The M27C64A has a standby mode which reduces the active current from 30mA to 100μA.
The M27C64A 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 required from a particular memory device.
2.4
System considerations
The power switching characteristics of Advanced CMOS EPROMs require careful
decoupling of the devices. The supply current, I
CC
, has three segments that are of interest to
the system designer: the standby current level, the active current level, and transient current
peaks that are produced by the falling and rising edges of E. The magnitude of the transient
current peaks is dependent on the capacitive and inductive loading of the device at the
output. The associated transient voltage peaks can be suppressed by complying with the
two line output control and by properly selected decoupling capacitors. It is recommended
that a 0.1μF ceramic capacitor be used on every device between V
CC
and V
SS
. This should
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M27C64A-15K1 | 64 Kbit (8Kb x8) UV EPROM and OTP EPROM |
| M27C64A-15K6 | 64 Kbit (8Kb x8) UV EPROM and OTP EPROM |
| M27C64A-20F1 | 64 Kbit (8Kb x8) UV EPROM and OTP EPROM |
| M27C64A-20F6 | 64 Kbit (8Kb x8) UV EPROM and OTP EPROM |
| M27C64A-20K1 | 64 Kbit (8Kb x8) UV EPROM and OTP EPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M27C64A15FI | 制造商:ST MICRO 功能描述:* |
| M27C64A20F1 | 制造商:STME 功能描述: |
| M27C64A-20F1 | 功能描述:可擦除可編程ROM 64K (8Kx8) 200ns 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 |
| M27C64A-20F6 | 功能描述:可擦除可編程ROM 64K (8Kx8) 200ns 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 |
| M27C64A20FI | 制造商:ST MICRO 功能描述:* |
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