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STMicroelectronics Electronic Components Datasheet

M27C400 Datasheet

4 Mbit 512Kb x8 or 256Kb x16 UV EPROM and OTP EPROM

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M27C400
4 Mbit (512Kb x8 or 256Kb x16) UV EPROM and OTP EPROM
s 5V ± 10% SUPPLY VOLTAGE in READ
OPERATION
s ACCESS TIME: 55ns
s BYTE-WIDE or WORD-WIDE
CONFIGURABLE
s 4 Mbit MASK ROM REPLACEMENT
s LOW POWER CONSUMPTION
– Active Current 70mA at 8MHz
– Stand-by Current 100µA
s PROGRAMMING VOLTAGE: 12.5V ± 0.25V
s PROGRAMMING TIME: 100µs/word
s ELECTRONIC SIGNATURE
– Manufacturer Code: 20h
– Device Code: B8h
DESCRIPTION
The M27C400 is an 4 Mbit EPROM offered in the
two ranges UV (ultra violet erase) and OTP (one
time programmable). It is ideally suited for micro-
processor systems requiring large data or program
storage. It is organised as either 512 Kwords of 8
bit or 256 Kwords of 16 bit. The pin-out is compat-
ible with the most common 8 Mbit Mask ROM.
The FDIP40W (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 rapidly to the de-
vice by following the programming procedure.
For applications where the content is programmed
only one time and erasure is not required, the
M27C400 is offered in PDIP40 package.
40
1
FDIP40W (F)
40
1
PDIP40 (B)
Figure 1. Logic Diagram
VCC
18
A0-A17
E
G
BYTEVPP
M27C400
Q15A–1
15
Q0-Q14
VSS
AI01634
May 1999
1/14


STMicroelectronics Electronic Components Datasheet

M27C400 Datasheet

4 Mbit 512Kb x8 or 256Kb x16 UV EPROM and OTP EPROM

No Preview Available !

M27C400
Figure 2. DIP Connections
A17
A7
A6
A5
A4
A3
A2
A1
A0
E
VSS
G
Q0
Q8
Q1
Q9
Q2
Q10
Q3
Q11
1 40 A8
2 39 A9
3 38 A10
4 37 A11
5 36 A12
6 35 A13
7 34 A14
8 33 A15
9 32 A16
10 31
M27C400
BYTEVPP
11 30 VSS
12 29 Q15A–1
13 28 Q7
14 27 Q14
15 26 Q6
16 25 Q13
17 24 Q5
18 23 Q12
19 22 Q4
20 21 VCC
AI01635
DEVICE OPERATION
The operating modes of the M27C400 are listed in
the Operating Modes Table. A single power supply
is required in the read mode. All inputs are TTL
compatible except for VPP and 12V on A9 for the
Electronic Signature.
Read Mode
The M27C400 has two organisations, Word-wide
and Byte-wide. The organisation is selected by the
signal level on the BYTEVPP pin. When BYTEVPP
is at VIH the Word-wide organisation is selected
and the Q15A–1 pin is used for Q15 Data Output.
When the BYTEVPP pin is at VIL the Byte-wide or-
ganisation is selected and the Q15A–1 pin is used
for the Address Input A–1. When the memory is
Table 1. Signal Names
A0-A17
Address Inputs
Q0-Q7
Data Outputs
Q8-Q14
Data Outputs
Q15A–1
Data Output / Address Input
E Chip Enable
G Output Enable
BYTEVPP
Byte Mode / Program Supply
VCC Supply Voltage
VSS Ground
logically regarded as 16 bit wide, but read in the
Byte-wide organisation, then with A–1 at VIL the
lower 8 bits of the 16 bit data are selected and with
A–1 at VIH the upper 8 bits of the 16 bit data are
selected.
The M27C400 has two control functions, both of
which must be logically active in order to obtain
data at the outputs. In addition the Word-wide or
Byte- wide organisation must be selected.
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 ad-
dress 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 ad-
dresses have been stable for at least tAVQV-tGLQV.
Standby Mode
The M27C400 has a standby mode which reduces
the supply current from 50mA to 100µA. The
M27C400 is placed in the standby mode by apply-
ing a CMOS high signal to the E input. When in the
standby mode, the outputs are in a high imped-
ance state, independent of the G input.
2/14


Part Number M27C400
Description 4 Mbit 512Kb x8 or 256Kb x16 UV EPROM and OTP EPROM
Maker STMicroelectronics
Total Page 14 Pages
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