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M27W401-120N6 データシート(PDF) 8 Page - STMicroelectronics

部品番号 M27W401-120N6
部品情報  4 Mbit (512Kb x 8) Low Voltage UV EPROM and OTP EPROM
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27W401-120N6 データシート(HTML) 8 Page - STMicroelectronics

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Device description
M27W401
8/23
2
Device description
Table 2 lists the operating modes of the M27W40. 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.
Note:
X = VIH or VIL, VID = 12V ± 0.5V.
2.1
Read mode
The M27W401 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 a 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 M27W401 has a standby mode which reduces the supply current from 15mA to 15µA
with low voltage operation VCC ≤ 3.6V, see Read Mode DC Characteristics table for details.
The M27W401 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
Table 2.
Operating modes
Mode
E
G
A9
VPP
Q7-Q0
Read
VIL
VIL
XVCC or VSS
Data Out
Output Disable
VIL
VIH
XVCC or VSS
Hi-Z
Program
VIL Pulse
VIH
XVPP
Data In
Verify
VIH
VIL
XVPP
Data Out
Program Inhibit
VIH
VIH
XVPP
Hi-Z
Standby
VIH
XX
VCC or VSS
Hi-Z
Electronic Signature
VIL
VIL
VID
VCC
Codes


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