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M27C516-85XC6TR Arkusz danych(PDF) 3 Page - STMicroelectronics

Numer części M27C516-85XC6TR
Szczegółowy opis  512 Kbit (32Kb x16) OTP EPROM
Download  12 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27C516-85XC6TR Arkusz danych(HTML) 3 Page - STMicroelectronics

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Mode
E
G
P
A9
VPP
Q0 - Q15
Read
VIL
VIL
VIH
XVCC
Data Out
Output Disable
VIL
VIH
XX
VCC
Hi-Z
Program
VIL
XVIL Pulse
X
VPP
Data In
Verify
VIL
VIL
VIH
XVPP
Data Out
Program Inhibit
VIH
XX
X
VPP
Hi-Z
Standby
VIH
XX
X
VCC
Hi-Z
Electronic Signature
VIL
VIL
VIH
VID
VCC
Codes
Notes:X = VIH or VIL,VID =12V
± 0.5V
Table 3. Operating Modes
Identifier
A0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Hex Data
Manufacturer’s Code
VIL
00
1000
00
20h
Device Code
VIH
00
0011
11
0Fh
Note: Outputs Q8-Q15 are set to ’0’.
Table 4. Electronic Signature
DEVICE OPERATION
The operating modes of the M27C516 are listed in
the Operating Modes table. A single power supply
is required in the read mode. All inputs are TTL
levels except for G and 12V on A9 for Electronic
Signature.
Read Mode
The M27C516 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, inde-
pendent 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 M27C516 has a standby mode which reduces
the supply current from 30mA to 100
µA. The
M27C516 is placed in the standby mode by apply-
ing a CMOS high signal to the E input. When in the
standbymode, the outputs are in a high impedance
state, independent of the G input.
Two Line Output Control
Because OTP EPROMs are usually used in larger
memory arrays, the product featuresa 2 line control
function which accommodates the use of multiple
memory connection. The two line control function
allows:
a. the lowest possible memory power dissipation,
b. 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 mem-
ory 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.
3/12
M27C516


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