1/15

April 1999

M27C202

2 Mbit (128Kb x16) UV EPROM and OTP EPROM

10% SUPPLY VOLTAGE in READ

OPERATION

ACCESS TIME: 45ns

LOW POWER CONSUMPTION:

Active Current 50mA at 5MHz

Standby Current 100

PROGRAMMING VOLTAGE: 12.75V

0.25V

PROGRAMMING TIME: 100

s/word

ELECTRONIC SIGNATURE

Manufacturer Code: 20h

Device Code: 1Ch

DESCRIPTION
The M27C202 is a 2 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 programs, in
the application where the contents is stable and
needs to be programmed only one time, and is or-
ganised as 131,072 by 16 bits.
The FDIP40W (window ceramic frit-seal package)
has a transparent lids which allow 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.
For applications where the content is programmed
only one time and erasure is not required, the
M27C202 is offered in PDIP40, PLCC44 and
TSOP40 (10 x 14 mm) packages.

Figure 1. Logic Diagram

AI01815

A0-A16

Q0-Q15

VPP

VCC

M27C202

VSS

FDIP40W (F)

PDIP40 (B)

PLCC44 (K)

TSOP40 (N)

10 x 14 mm

M27C202

2/15

Figure 2B. TSOP Connections

DQ6

DQ3

DQ2

DQ13

DQ8

DQ7

DQ10

DQ9

A14

A11

A10

A15

DQ1

DQ0

A16

DQ14

VPP

VCC

DQ15

AI01817B

M27C202

VSS

A12

A13

DQ12

DQ4

DQ11

DQ5

VSS

Figure 2A. DIP Connections

Q5
Q4

Q11

VSS

Q10

A12

A11

A10

A13

VSS

A16

Q12

VPP

VCC

Q15

AI02784

M27C202

5
6

14
15

27
26

Q14

Q13

36
35

A14

A15

Figure 2C. LCC Connections

AI01816

A14

A11

Q12

VSS

Q11

Q10

A15

Q15

VSS

A12

Q13

A16

M27C202

Q14

A13

A10

Table 1. Signal Names

A0-A16

Address Inputs

Q0-Q15

Data Outputs

Chip Enable

Output Enable

Program

Program Supply

Supply Voltage

Ground

Not Connected Internally

3/15

M27C202

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

Note: Outputs Q15-Q8 are set to '0'.

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

(3)

40 to 125

BIAS

Temperature Under Bias

50 to 125

STG

Storage Temperature

65 to 150

(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

Q15-Q0

Read

or V

Data Output

Output Disable

or V

Hi-Z

Program

Pulse

Data Input

Verify

Data Output

Program Inhibit

Hi-Z

Standby

or V

Hi-Z

Electronic Signature

Codes

Identifier

Hex Data

Manufacturer's Code

20h

Device Code

1Ch

M27C202

4/15

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

Table 6. Capacitance

(1)

= 25

C, f = 1 MHz)

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

Symbol

Parameter

Test Condit ion

Min

Max

Unit

Input Capacitance

= 0V

OUT

Output Capacitance

OUT

= 0V

DEVICE OPERATION
The operating modes of the M27C202 are listed in
the Operating Modes table. A single power supply
is required in the read mode. All inputs are TTL
levels except for V

and 12V on A9 for Electronic

Signature.
Read Mode
The M27C202 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
(t

AVQV

) is equal to the delay from E to output

ELQV

). Data is available at the output after a delay

of t

from the falling edge of G, assuming that E

has been low and the addresses have been stable
for at least t

AVQV

-t

GLQV

Standby Mode
The M27C202 has a standby mode which reduces
the supply current from 50mA to 100

The M27C202 is placed in the standby mode by
applying a TTL 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.

5/15

M27C202

Table 7. Read Mode DC Characteristics

(1)

= 0 to 70

C, 40 to 85

C or 40 to 125

C; V

= 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

Output Leakage Current

OUT

Supply Current

E = V

, G = V

OUT

= 0mA, f = 5MHz

CC1

Supply Current (Standby) TTL

E = V

CC2

Supply Current (Standby) CMOS

E > V

0.2V

100

Program Current

= V

100

Input Low Voltage

0.3

0.8

(2)

Input High Voltage

+ 1

Output Low Voltage

= 2.1mA

0.4

Output High Voltage TTL

= 400

2.4

Output High Voltage CMOS

= 100

0.7V

Two Line Output Control
Because OTP EPROMs are usually used in larger
memory arrays, this product features a 2 line con-
trol function which accommodates the use of mul-
tiple 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 prima-
ry 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 deselect-
ed memory 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.

System Considerations
The power switching characteristics of Advanced
CMOS EPROMs require careful decoupling of the
devices. The supply current, I

, has three seg-

ments that are of interest to the system designer:
the standby current level, the active current level,
and transient current peaks that are produced by
the falling and rising edges of E. The magnitude of
transient current peaks is dependent on the ca-
pacitive and inductive loading of the device at the
output. The associated transient voltage peaks
can be suppressed by complying with the two line
output control and by properly selected decoupling
capacitors. It is recommended that a 0.1

F ceram-

ic capacitor be used on every device between V

and V

. This should be a high frequency capaci-

tor of low inherent inductance and should be
placed as close to the device as possible. In addi-
tion, a 4.7

F bulk electrolytic capacitor should be

used between V

and V

for every eight devic-

es. The bulk capacitor should be located near the
power supply connection point.The purpose of the
bulk capacitor is to overcome the voltage drop
caused by the inductive effects of PCB traces.

M27C202

6/15

Table 8. Read Mode AC Characteristics

(1)

= 0 to 70

C, 40 to 85

C or 40 to 125

C; V

= 5V

10%; V

= V

)

Note: 1. V

must be applied simultaneously with or before V

and removed simultaneously or after V

2. Sampled only, not 100% tested.
3. Speed obtained with High Speed AC measurement conditions.

Symbol

Alt

Parameter

Test Condition

M27C202

Unit

-45

(3)

-70

(3)

-80

-100

Min

Max

Min

Max

Min

Max

Min

Max

AVQV

ACC

Address Valid to
Output Valid

E = V

, G = V

100

ELQV

Chip Enable Low to
Output Valid

G = V

100

GLQV

Output Enable Low
to Output Valid

E = V

EHQZ

(2)

Chip Enable High to
Output Hi-Z

G = V

GHQZ

(2)

Output Enable High
to Output Hi-Z

E = V

AXQX

Address Transition to
Output Transition

E = V

, G = V

Figure 5. Read Mode AC Waveforms

AI01818B

tAXQX

tEHQZ

A0-A16

Q0-Q15

tAVQV

tGHQZ

tGLQV

tELQV

VALID

Hi-Z

VALID

7/15

M27C202

Table 9. Programming Mode DC Characteristics

(1)

= 25

C; V

= 6.25V

0.25V; V

= 12.75V

0.25V)

Note: 1. V

must be applied simultaneously with or before V

and removed simultaneously or after V

Table 10. Programming Mode AC Characteristics

(1)

= 25

C; V

= 6.25V

0.25V; V

= 12.75V

0.25V)

Note: 1. V

must be applied simultaneously with or before V

and removed simultaneously or after V

2. Sampled only, not 100% tested.

Symbol

Parameter

Test Condition

Min

Max

Unit

Input Leakage Current

Supply Current

Program Current

E = V

Input Low Voltage

0.3

0.8

Input High Voltage

+ 0.5

Output Low Voltage

= 2.1mA

0.4

Output High Voltage TTL

= 400

2.4

A9 Voltage

11.5

12.5

Symbol

Alt

Parameter

Test Condi tion

Min

Max

Unit

AVPL

Address Valid to Program Low

QVPL

Input Valid to Program Low

VPHPL

VPS

High to Program Low

VCHPL

VCS

High to Program Low

ELPL

CES

Chip Enable Low to Program Low

PLPH

Program Pulse Width

105

PHQX

Program High to Input Transition

QXGL

OES

Input Transition to Output Enable Low

GLQV

Output Enable Low to Output Valid

100

GHQZ

(2)

DFP

Output Enable High to Output Hi-Z

130

GHAX

Output Enable High to Address
Transition

Programming
When delivered (and after each `1's erasure for UV
EPROM), all bits of the M27C202 are in the '1'
state. Data is introduced by selectively program-
ming '0's into the desired bit locations. Although
only '0's will be programmed, both '1's and '0's can
be present in the data word. The only way to
change a `0' to a `1' is by die exposure to ultraviolet

light (UV EPROM). The M27C202 is in the pro-
gramming mode when V

input is at 12.75V, E is

at V

and P is pulsed to V

. The data to be pro-

grammed is applied to 16 bits in parallel, to the
data output pins. The levels required for the ad-
dress and data inputs are TTL. V

is specified to

be 6.25V

0.25V.

M27C202

8/15

Figure 6. Programming and Verify Modes AC Waveforms

tAVPL

VALID

AI00706

A0-A15

Q0-Q15

VPP

VCC

DATA IN

DATA OUT

tQVPL

tVPHPL

tVCHPL

tPHQX

tPLPH

tGLQV

tQXGL

tELPL

tGHQZ

tGHAX

PROGRAM

VERIFY

Figure 7. Programming Flowchart

AI00707C

n = 0

Last

Addr

VERIFY

P = 100

s Pulse

++n

= 25

++ Addr

VCC = 6.25V, VPP = 12.75V

FAIL

CHECK ALL WORDS

1st: VCC = 6V

2nd: VCC = 4.2V

YES

PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows pro-
gramming of the whole array with a guaranteed
margin, in a typical time of 13 seconds. Program-
ming with PRESTO II consists of applying a se-
quence of 100

s program pulses to each word

until a correct verify occurs (see Figure 7). During
programming and verify operation, a MARGIN
MODE circuit is automatically activated in order to
guarantee that each cell is programmed with
enough margin. No overprogram pulse is applied
since the verify in MARGIN MODE provides nec-
essary margin to each programmed cell.
Program Inhibit
Programming of multiple M27C202s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27C202 may be common. A TTL low level pulse
applied to a M27C202's P input, with E low and
V

at 12.75V, will program that M27C202. A high

level E input inhibits the other M27C202s from be-
ing programmed.
Program Verify
A verify (read) should be performed on the pro-
grammed bits to determine that they were correct-
ly programmed. The verify is accomplished with E
and G at V

, P at V

, V

at 12.75V and V

6.25V.

9/15

M27C202

On-Board Programming
The M27C202 can be directly programmed in the
application circuit. See the relevant Application
Note AN620.
Electronic Signature
The Electronic Signature (ES) mode allows the
reading out of a binary code from an EPROM that
will identify its manufacturer and type. This mode
is intended for use by programming equipment to
automatically match the device to be programmed
with its corresponding programming algorithm.
The ES mode is functional in the 25

C am-

bient temperature range that is required when pro-
gramming the M27C202. To activate the ES
mode, the programming equipment must force
11.5V to 12.5V on address line A9 of the M27C202
with V

= V

= 5V. Two identifier bytes may

then be sequenced from the device outputs by tog-
gling address line A0 from V

to V

. All other ad-

dress lines must be held at V

during Electronic

Signature mode. Byte 0 (A0 = V

) represents the

manufacturer code and byte 1 (A0 = V

) the de-

vice identifier code. For the STMicroelectronics
M27C202, these two identifier bytes are given in
Table 4 and can be read-out on outputs Q7 to Q0.

ERASURE OPERATION (applies to UV EPROM)
The erasure characteristics of the M27C202 is
such that erasure begins when the cells are ex-
posed to light with wavelengths shorter than ap-
proximately 4000 Å. It should be noted that
sunlight and some type of fluorescent lamps have
wavelengths in the 3000-4000 Å range. Research
shows that constant exposure to room level fluo-
rescent lighting could erase a typical M27C202 in
about 3 years, while it would take approximately 1
week to cause erasure when exposed to direct
sunlight. If the M27C202 is to be exposed to these
types of lighting conditions for extended periods of
time, it is suggested that opaque labels be put over
the M27C202 window to prevent unintentional era-
sure. The recommended erasure procedure for
the M27C202 is exposure to short wave ultraviolet
light which has wavelength 2537 Å. The integrated
dose (i.e. UV intensity x exposure time) for erasure
should be a minimum of 15 W-sec/cm

. The era-

sure time with this dosage is approximately 15 to
20 minutes

using an

ultraviolet

lamp

with

12000

W/cm

power rating. The M27C202 should

be placed within 2.5 cm (1 inch) of the lamp tubes
during the erasure. Some lamps have a filter on
their tubes which should be removed before era-
sure.

M27C202

10/15

Table 11. Ordering Information Scheme

Note: 1. High Speed, see AC Characteristics section for further information.

2. These speeds are replaced by the 100ns.

For a list of available options (Speed, Package, etc...) or for further information on any aspect of this de-
vice, please contact the STMicroelectronics Sales Office nearest to you.

Example:

M27C202

-80

Device Type
M27

Supp ly Voltage
C = 5V

10%

Device Function
202 = 2 Mbit (128Kb x16)

Speed

-45

(1)

= 45 ns

-70

(1)

= 70 ns

-80 = 80 ns
-100 = 100 ns

Not For New Design

(2)

-120 = 120 ns
-150 = 150 ns

-200 = 200 ns

Package
F = FDIP40W

B = PDIP40
K = PLCC44
N = TSOP40: 10 x 14 mm

Temperature Range
1 = 0 to 70

3 = 40 to 125

6 = 40 to 85

Optio ns
TR = Tape & Reel Packing

11/15

M27C202

Table 12. FDIP40W - 40 lead Ceramic Frit-seal DIP with window, Package Mechanical Data

Symb

inches

Typ

Min

Max

Typ

Min

Max

5.72

0.225

0.51

1.40

0.020

0.055

3.91

4.57

0.154

0.180

3.89

4.50

0.153

0.177

0.41

0.56

0.016

0.022

1.45

0.057

0.23

0.30

0.009

0.012

51.79

52.60

2.039

2.071

48.26

1.900

15.24

0.600

13.06

13.36

0.514

0.526

2.54

0.100

14.99

0.590

16.18

18.03

0.637

0.710

3.18

0.125

1.52

2.49

0.060

0.098

8.13

0.320

Figure 8. FDIP40W - 40 lead Ceramic Frit-seal DIP with window, Package Outline

Drawing is not to scale.

FDIPW-a

M27C202

12/15

Table 13. PDIP40 - 40 pin Plastic DIP, 600 mils width, Package Mechanical Data

Symb

inches

Typ

Min

Max

Typ

Min

Max

4.45

0.175

0.64

0.38

0.025

0.015

3.56

3.91

0.140

0.154

0.38

0.53

0.015

0.021

1.14

1.78

0.045

0.070

0.20

0.31

0.008

0.012

51.78

52.58

2.039

2.070

48.26

1.900

14.80

16.26

0.583

0.640

13.46

13.99

0.530

0.551

2.54

0.100

15.24

0.600

15.24

17.78

0.600

0.700

3.05

3.81

0.120

0.150

1.52

2.29

0.060

0.090

Figure 9. PDIP40 - 40 lead Plastic DIP, 600 mils width, Package Outline

Drawing is not to scale.

PDIP

13/15

M27C202

Table 14. PLCC44 - 44 lead Plastic Leaded Chip Carrier, Package Mechanical Data

Symb

inches

Typ

Min

Max

Typ

Min

Max

4.20

4.70

0.165

0.185

2.29

3.04

0.090

0.120

0.51

0.020

0.33

0.53

0.013

0.021

0.66

0.81

0.026

0.032

17.40

17.65

0.685

0.695

16.51

16.66

0.650

0.656

14.99

16.00

0.590

0.630

17.40

17.65

0.685

0.695

16.51

16.66

0.650

0.656

14.99

16.00

0.590

0.630

1.27

0.050

0.00

0.25

0.000

0.010

0.89

0.035

0.10

0.004

Figure 10. PLCC44 - 44 lead Plastic Leaded Chip Carrier, Package Outline

Drawing is not to scale.

PLCC

E1 E

1 N

D2/E2

0.51 (.020)

1.14 (.045)

M27C202

14/15

Table 15. TSOP40 - 40 lead Plastic Thin Small Outline, 10 x 14 mm, Package Mechanical Data

Symb

inches

Typ

Min

Max

Typ

Min

Max

1.20

0.047

0.05

0.15

0.002

0.006

0.95

1.05

0.037

0.041

0.17

0.27

0.007

0.011

0.10

0.21

0.004

0.008

13.80

14.20

0.543

0.559

12.30

12.50

0.484

0.492

9.90

10.10

0.390

0.398

0.50

0.020

0.50

0.70

0.020

0.028

0.10

0.004

Figure 11. TSOP40 - 40 lead Plastic Thin Small Outline, 10 x 14 mm, Package Outline

Drawing is not to scale.

TSOP-a

N/2

DIE

15/15

M27C202

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMi croelectronics products are not
authorized for use as critical components in lif e support devices or systems without express written approval of STMicroelectronics.

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