M27W201-120NZ6TR Ver la hoja de datos (PDF) - STMicroelectronics
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M27W201-120NZ6TR Datasheet PDF : 24 Pages
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Device Description
2
Device Description
M27W201
Note:
2.1
2.2
The operating modes of the M27W201 are listed in the Operating Modes table. 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.
Table 1. Operating Modes
Table 2. Operating modes
Mode
E
Read
VIL
Output Disable
VIL
Program
VIL
Verify
VIL
Program Inhibit
VIH
Standby
VIH
Electronic Signature
VIL
X = VIH or VIL, VID = 12V ± 0.5V.
G
P
A9
VPP
Q7-Q0
VIL
X
X
VCC or VSS Data Out
VIH
X
X
VCC or VSS Hi-Z
VIH
VIL Pulse
X
VPP
Data In
VIL
VIH
X
VPP
Data Out
X
X
X
VPP
Hi-Z
X
X
X
VCC or VSS Hi-Z
VIL
VIH
VID
VCC
Codes
Read mode
The M27W201 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.
Standby mode
The M27W201 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 M27W201 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.
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