m27w101 STMicroelectronics, m27w101 Datasheet - Page 8

• Manufacturer Part Number: m27w101
• Description: 1 Mbit 128kb X8 Low Voltage Uv Eprom And Otp Eprom
• Manufacturer: STMicroelectronics

Device description
2
Note:
2.1
2.2
2.3
8/23
Device description
The operating modes of the M27W101 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
on A9 for Electronic Signature.
Table 2.
X = V
Read mode
The M27W101 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
available at the output after a delay of t
been low and the addresses have been stable for at least t
Standby mode
The M27W101 has a standby mode which reduces the supply current from 15mA to 15µA
with low voltage operation V
The M27W101 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.
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:
Read
Output Disable
Program
Verify
Program Inhibit
Standby
Electronic Signature
the lowest possible memory power dissipation,
complete assurance that output bus contention will not occur.
IH
Mode
or V
IL
Operating modes
, V
ID
= 12V ± 0.5V.
V
V
V
V
V
V
V
E
AVQV
IH
IH
IL
IL
IL
IL
IL
CC
) is equal to the delay from E to output (t
3.6V, see Read Mode DC Characteristics table for details.
V
V
V
V
V
G
X
X
GLQV
IH
IH
IL
IL
IL
from the falling edge of G, assuming that E has
V
IL
V
V
Pulse
P
X
X
X
X
IH
IH
AVQV
V
A9
X
X
X
X
X
X
ID
-t
GLQV
V
V
V
.
CC
CC
CC
ELQV
V
V
V
V
V
or V
or V
or V
CC
PP
PP
PP
PP
). Data is
SS
SS
SS
PP
M27W101
Data Out
Data Out
Data In
and 12V
Q7-Q0
Codes
Hi-Z
Hi-Z
Hi-Z