1/18

December 2001

M27C800

8 Mbit (1Mb x8 or 512Kb x16) UV EPROM and OTP EPROM

5V ± 10% SUPPLY VOLTAGE in READ
OPERATION

ACCESS TIME: 50ns

BYTE-WIDE or WORD-WIDE
CONFIGURABLE

8 Mbit MASK ROM REPLACEMENT

LOW POWER CONSUMPTION

Active Current 70mA at 8MHz

Stand-by Current 50µA

PROGRAMMING VOLTAGE: 12.5V ± 0.25V

PROGRAMMING TIME: 50µs/word

ELECTRONIC SIGNATURE

Manufacturer Code: 20h

Device Code: B2h

DESCRIPTION
The M27C800 is an 8 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 1 Mwords of 8 bit
or 512 Kwords of 16 bit. The pin-out is compatible
with the most common 8 Mbit Mask ROM.
The FDIP42W (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
M27C800 is offered in PDIP42, PLCC44 and
SO44 packages.

FDIP42W (F)

PDIP42 (B)

SO44 (M)

PLCC44 (K)

Figure 1. Logic Diagram

AI01593

A0-A18

BYTEVPP

Q0-Q14

VCC

M27C800

VSS

Q15A1

M27C800

2/18

Figure 2B. LCC Connections

AI02042

A11

A14

Q12

VSS

A10

A16

BYTEVPP

A13

M27C800

A12

Q13

VSS

Q14

Q10

A15

Q15A1

Q11

A18

A17

Figure 2A. DIP Connections

VSS

A13

VSS

A14

A15

A12

A16

BYTEVPP

Q15A1

VCC

Q11

Q14

A17

A18

AI01594

M27C800

Q13

A11

A10

Q10

Q12

Figure 2C. SO Connections

VSS

A13

VSS

A14

A15

A12

A16

BYTEVPP

Q15A1

VCC

Q11

Q14

A18

AI01595

M27C800

Q13

A11

A10

Q10

Q12

A17

Table 1. Signal Names

A0-A18

Address Inputs

Q0-Q7

Data Outputs

Q8-Q14

Data Outputs

Q15A1

Data Output / Address Input

Chip Enable

Output Enable

BYTEV

Byte Mode / Program Supply

Supply Voltage

Ground

Not Connected Internally

3/18

M27C800

Table 2. Absolute Maximum Ratings

(1)

Note: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may

cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions
above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi-
tions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant qual-
ity documents.

2. Minimum DC voltage on Input or Output is 0.5V with possible undershoot to 2.0V for a period less than 20ns. Maximum DC

voltage on Output is V

+0.5V with possible overshoot to V

+2V for a period less than 20ns.

3. Depends on range.

Table 3. Operating Modes

Note: X = V

or V

, V

= 12V ± 0.5V.

Table 4. Electronic Signature

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

(3)

40 to 125

°C

BIAS

Temperature Under Bias

50 to 125

°C

STG

Storage Temperature

65 to 150

°C

(2)

Input or Output Voltage (except A9)

2 to 7

Supply Voltage

2 to 7

(2)

A9 Voltage

2 to 13.5

Program Supply Voltage

2 to 14

Mode

BYTEV

Q15A1

Q14-Q8

Q7-Q0

Read Word-wide

Data Out

Read Byte-wide Upper

Hi-Z

Data Out

Read Byte-wide Lower

Hi-Z

Data Out

Output Disable

Hi-Z

Program

Pulse

Data In

Verify

Data Out

Program Inhibit

Hi-Z

Standby

Hi-Z

Electronic Signature

Code

Codes

Identifier

Q15

and

Q14

and

Q13

and

Q12

and

Q11
and

Q10

and

Hex Data

Manufacturer's Code

20h

Device Code

B2h

M27C800

4/18

DEVICE OPERATION
The operating modes of the M27C800 are listed in
the Operating Modes Table. A single power supply
is required in the read mode. All inputs are TTL
compatible except for V

and 12V on A9 for the

Electronic Signature.
Read Mode
The M27C800 has two organisations, Word-wide
and Byte-wide. The organisation is selected by the
signal level on the BYTEV

pin. When BYTEV

is at V

the Word-wide organisation is selected

and the Q15A1 pin is used for Q15 Data Output.
When the BYTEV

pin is at V

the Byte-wide or-

ganisation is selected and the Q15A1 pin is used
for the Address Input A1. When the memory is
logically regarded as 16 bit wide, but read in the
Byte-wide organisation, then with A1 at V

the

lower 8 bits of the 16 bit data are selected and with
A1 at V

the upper 8 bits of the 16 bit data are

selected.
The M27C800 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 (t

AVQV

) is equal to the delay

from E to output (t

ELQV

). Data is available at the

output after a delay of t

GLQV

from the falling edge

of G, assuming that E has been low and the ad-
dresses have been stable for at least t

AVQV

-t

GLQV

Table 5. AC Measurement Conditions

High Speed

Standard

Input Rise and Fall Times

10ns

20ns

Input Pulse Voltages

0 to 3V

0.4V to 2.4V

Input and Output Timing Ref. Voltages

1.5V

0.8V and 2V

Figure 3. AC Testing Input Output Waveform

AI01822

High Speed

1.5V

2.4V

Standard

0.4V

2.0V

0.8V

Figure 4. AC Testing Load Circuit

AI01823B

1.3V

OUT

CL = 30pF for High Speed
CL = 100pF for Standard
CL includes JIG capacitance

3.3k

1N914

DEVICE

UNDER

TEST

5/18

M27C800

Table 7. Read Mode DC Characteristics

(1)

= 0 to 70 °C or 40 to 85 °C; V

= 5V ± 5% or 5V ± 10%; V

= V

)

Note: 1. V

must be applied simultaneously with or before V

and removed simultaneously or after V

2. Maximum DC voltage on Output is V

+ 0.5V.

Symbol

Parameter

Test Condition

Min

Max

Unit

Input Leakage Current

±1

µA

Output Leakage Current

OUT

±10

µA

Supply Current

E = V

, G = V

OUT

= 0mA, f = 8MHz

E = V

, G = V

OUT

= 0mA, f = 5MHz

CC1

Supply Current (Standby) TTL

E = V

CC2

Supply Current (Standby) CMOS

E > V

0.2V

µA

Program Current

= V

µA

Input Low Voltage

0.3

0.8

(2)

Input High Voltage

+ 1

Output Low Voltage

= 2.1mA

0.4

Output High Voltage TTL

= 400µA

2.4

Table 6. Capacitance

(1)

= 25 °C, f = 1 MHz)

Note: 1. Sampled only, not 100% tested.

Symbol

Parameter

Test Condition

Min

Max

Unit

Input Capacitance (except BYTEV

)

= 0V

Input Capacitance (BYTEV

)

= 0V

120

OUT

Output Capacitance

OUT

= 0V

Standby Mode

The M27C800 has a standby mode which reduces
the supply current from 50mA to 100µA. The

M27C800 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.

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