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M27V256 Datasheet

256 Kbit 32Kb x 8 Low Voltage UV EPROM and OTP EPROM

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M27V256
256 Kbit (32Kb x 8) Low Voltage UV EPROM and OTP EPROM
s LOW VOLTAGE READ OPERATION:
3V to 3.6V
s FAST ACCESS TIME: 90ns
s LOW POWER CONSUMPTION:
– Active Current 10mA at 5MHz
– Standby Current 10µA
s PROGRAMMING VOLTAGE: 12.75V ± 0.25V
s PROGRAMMING TIME: 100µs/byte (typical)
s ELECTRONIC SIGNATURE
– Manufacturer Code: 20h
– Device Code: 8Dh
DESCRIPTION
The M27V256 is a low voltage 256 Kbit EPROM
offered in the two ranges UV (ultra violet erase)
and OTP (one time programmable). It is ideally
suited for microprocessor systems and is orga-
nized as 32,768 by 8 bits.
The M27V256 operates in the read mode with a
supply voltage as low as 3V. The decrease in op-
erating power allows either a reduction of the size
of the battery or an increase in the time between
battery recharges.
The FDIP28W (window ceramic frit-seal package)
has a transparent lid which allows the user to ex-
pose the chip to ultraviolet light to erase the bit pat-
tern. A new pattern can then be written to the
device by following the programming procedure.
28
1
FDIP28W (F)
28
1
PDIP28 (B)
PLCC32 (K)
TSOP28 (N)
8 x 13.4mm
Figure 1. Logic Diagram
VCC VPP
15
A0-A14
8
Q0-Q7
Table 1. Signal Names
A0-A14
Address Inputs
Q0-Q7
Data Outputs
E Chip Enable
G Output Enable
VPP Program Supply
VCC Supply Voltage
VSS Ground
E M27V256
G
VSS
AI01908
May 1998
1/15


STMicroelectronics Electronic Components Datasheet

M27V256 Datasheet

256 Kbit 32Kb x 8 Low Voltage UV EPROM and OTP EPROM

No Preview Available !

M27V256
Figure 2A. DIP Pin Connections
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
Q0
Q1
Q2
VSS
1 28
2 27
3 26
4 25
5 24
6 23
7 22
M27V256
8 21
9 20
10 19
11 18
12 17
13 16
14 15
VCC
A14
A13
A8
A9
A11
G
A10
E
Q7
Q6
Q5
Q4
Q3
AI01909
Figure 2C. TSOP Pin Connections
G
A11
A9
A8
A13
A14
VCC
VPP
A12
A7
A6
A5
A4
A3
22 21
28 15
M27V256
1 14
78
A10
E
Q7
Q6
Q5
Q4
Q3
VSS
Q2
Q1
Q0
A0
A1
A2
AI01911
Figure 2B. LCC Pin Connections
A6
A5
A4
A3
A2 9
A1
A0
NC
Q0
1 32
M27V256
17
A8
A9
A11
NC
25 G
A10
E
Q7
Q6
AI01910
Warning: NC = Not Connected, DU = Dont’t Use.
For applications where the content is programmed
only one time and erasure is not required, the
M27V256 is offered in PDIP28, PLCC32 and
TSOP28 (8 x 13.4 mm) packages.
DEVICE OPERATION
The modes of operation of the M27V256 are listed
in the Operating Modes. A single power supply is
required in the read mode. All inputs are TTL lev-
els except for VPP and 12V on A9 for Electronic
Signature.
Read Mode
The M27V256 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, indepen-
dent of device selection. Assuming that the ad-
dresses are stable, the address access time
(tAVQV) is equal to the delay from E to output
(tELQV). Data is available at the output after delay
of tGLQV from the falling edge of G, assuming that
E has been low and the addresses have been sta-
ble for at least tAVQV-tGLQV.
2/15



Part Number M27V256
Description 256 Kbit 32Kb x 8 Low Voltage UV EPROM and OTP EPROM
Maker STMicroelectronics
Total Page 15 Pages
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M27V256 Datasheet PDF





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