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M27W512 bảng dữ liệu(PDF) 7 Page - STMicroelectronics

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M27W512
Device operation
7/22
2
Device operation
The modes of operations of the M27W512 are listed in Table 2: Operating modes. A single
power supply is required in the read mode. All inputs are TTL levels except for GVPP and
12V on A9 for Electronic Signature.
2.1
Read mode
The M27W512 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 M27W512 has a standby mode which reduces the supply current from 15mA to 15µA
with low voltage operation VCC ≤ 3.6V, see Table 7: Read mode DC characteristics.
Characteristics table for details. The M27W512 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 GVPP input.
Table 2.
Operating modes(1)
1.
X = VIH or VIL, VID = 12V ± 0.5V.
Mode
E
GVPP
A9
Q7-Q0
Read
VIL
VIL
X
Data Out
Output Disable
VIL
VIH
X
Hi-Z
Program
VIL Pulse
VPP
X
Data In
Program Inhibit
VIH
VPP
X
Hi-Z
Standby
VIH
X
X
Hi-Z
Electronic Signature
VIL
VIL
VID
Codes
Table 3.
Electronic signature
Identifier
A0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Hex data
Manufacturer code
VIL
00
100
000
20h
Device code
VIH
00
111
101
3Dh


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