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M27C405 Datasheet

4 Mbit 512Kb x 8 OTP EPROM

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M27C405
4 Mbit (512Kb x 8) OTP EPROM
5V ± 10% SUPPLY VOLTAGE in READ
OPERATION
PIN COMPATIBLE with the 4 Mbit,
SINGLE VOLTAGE FLASH MEMORY
FAST ACCESS TIME: 70ns
LOW POWER CONSUMPTION:
– Active Current 30mA at 5MHz
– Standby Current 100µA
PROGRAMMING VOLTAGE: 12.75V ± 0.25V
PROGRAMMING TIMES
– Typical 48sec. (PRESTO II Algorithm)
– Typical 27sec. (On-Board Programming)
ELECTRONIC SIGNATURE
– Manufacturer Code: 20h
– Device Code: B4
32
1
PDIP32 (B)
PLCC32 (K)
TSOP32 (N)
8 x 20mm
DESCRIPTION
The M27C405 is a 4 Mbit EPROM offered in the
OTP (one time programmable) range. It is ideally
suited for microprocessor systems requiring large
programs, in the application where the contents is
stable and needs to be programmed only one time
and is organised as 524,288 by 8 bits.
The M27C405 is pin compatible with the industry
standard 4 Mbit, single voltage Flash memory. It
can be consideredas a Flash Low Cost solution for
production quantities.
The M27C405 is offered in PDIP32, PLCC32 and
TSOP32 (8 x 20 mm) packages.
Table 1. Signal Names
A0-A18
Address Inputs
Q0-Q7
E
Data Outputs
Chip Enable
G Output Enable
VPP Program Supply
VCC Supply Voltage
VSS Ground
Figure 1. Logic Diagram
VCC VPP
19
A0-A18
8
Q0-Q7
E M27C405
G
VSS
AI01601
March 1999
1/15


STMicroelectronics Electronic Components Datasheet

M27C405 Datasheet

4 Mbit 512Kb x 8 OTP EPROM

No Preview Available !

M27C405
Figure 2A. DIP Pin Connections
A18
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
Q0
Q1
Q2
VSS
1 32
2 31
3 30
4 29
5 28
6 27
7 26
8 25
M27C405
9 24
10 23
11 22
12 21
13 20
14 19
15 18
16 17
VCC
VPP
A17
A14
A13
A8
A9
A11
G
A10
E
Q7
Q6
Q5
Q4
Q3
AI01602
Figure 2B. LCC Pin Connections
A7
A6
A5
A4
A3 9
A2
A1
A0
Q0
1 32
M27C405
17
A14
A13
A8
A9
25 A11
G
A10
E
Q7
AI01603
Figure 2C. TSOP Pin Connections
A11
A9
A8
A13
A14
A17
VPP
VCC
A18
A16
A15
A12
A7
A6
A5
A4
1 32 G
A10
E
8 M27C405 25
9 (Normal) 24
16 17
Q7
Q6
Q5
Q4
Q3
VSS
Q2
Q1
Q0
A0
A1
A2
A3
AI01604
DEVICE OPERATION
The modesof operationsof theM27C405 are listed
in the Operating Modes table. A single power sup-
ply is required in the read mode. All inputs are TTL
levels except for Vpp and 12V on A9 for Electronic
Signature.
Read Mode
The M27C405 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 equalto the delay from E to output (tELQV).
Data is availableat 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 M27C405 has a standby mode which reduces
the active current from 30mA to 100µA. The
M27C405 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.
2/15



Part Number M27C405
Description 4 Mbit 512Kb x 8 OTP EPROM
Maker STMicroelectronics
Total Page 15 Pages
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M27C405 Datasheet PDF





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