SGS Thomson Microelectronics M27C320 Datasheet

32 Mbit (4Mb x8 or 2Mb x16) OTP EPROM

■ 5V ± 10% SUPPLY VOLTAGE in READ

OPERATION

■ FAST ACCESS TIME: 80ns

■ BYTE-WIDE or WORD-WIDE

CONFIGURABLE

■ 32 MbitMASK ROM REPLACEMENT

■ LOW POWER CONSUMPTION

– Active Current70mA at 8MHz
– Stand-by Current 100mA

■ PROGRAMMING VOLTAGE: 12V ± 0.25V

■ PROGRAMMING TIME: 100µs/byte

(typical)(PRESTO III Algorithm)

■ ELECTRONIC SIGNATURE:

– Manufacturer Code0020h
– Device Code: 0032h

M27C320

PRELIMINARY DATA

44

1

SO44 (M) TSOP48 (N)

12 x20 mm

Figure 1. Logic Diagram

DESCRIPTION

The M27C320 is a 32 Mbit EPROM offered in the
OTP range (one time programmable). It is ideally
suited for microprocessor systems requiring large
data or program storage. It is organised as either
4 MWords of 8 bit or 2 MWords of 16 bit. The pin­out is compatible with the 32 Mbit Mask ROM.

The M27C320 is offered in TSOP48 (12 x 20mm)
and SO44 packages.

Table 1. Signal Names

A0-A20 Address Inputs
Q0-Q7 Data Outputs
Q8-Q14 Data Outputs
Q15A–1 Data Output / Address Input
E Chip Enable
GV

PP

BYTE Byte-Wide Select
V

CC

V

SS

Output Enable / Program Supply

Supply Voltage
Ground

A0-A20

GV

PP

V

CC

21

Q15A–1

15

Q0-Q14

E

M27C320

BYTE

V

SS

AI02152

September 1998

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

1/15

M27C320

Figure 2A. SO Pin Connections

NC A20

1
2

A7
A6
A5
A4
A3
A2
A1
A0

3
4
5
6
7
8
9
10
11
12

M27C320

E

13
14
15
16

A17 A8

V

SS

GV

PP
Q0

Q8

17Q1

Q9

18
19

Q10

Q3

20
21

Q11

44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
2322

AI02153

A19A18

A9
A10
A11
A12
A13
A14
A15
A16
BYTE
V

SS

Q15A–1
Q7
Q14
Q6
Q13
Q5Q2
Q12
Q4
V

CC

Figure 2B. TSOP Pin Connections

BYTE

A16
A15
A14
A13
A12

A10

A9
A8

A19

V

SS

A20
A18
A17

A7
A6
A5
A4

A2
A1
A0

1

12

M27C320

13

24 25

E

48

37
36

AI02154

V

SS

V

SS

Q15A–1
Q7
Q14
Q6
Q13A11
Q5
Q12
Q4
V

CC

V

CC

V

SS

Q11
Q3
Q10
Q2
Q9
Q1
Q8A3
Q0
GV

PP

V

SS

V

SS

Warning: NC = Not Connected.

Table 2. Absolute Maximum Ratings

Symbol Parameter Value Unit

T

A

T

BIAS

T

STG

(2)

V

IO

V

CC

(2)

V

A9

V

PP

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

2/15

cause permanent damage to the device. These are stress ratings only and operation of the device atthese or any other conditions
above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi­tions for extended periodsmay affect device reliability. Referalso to theSTMicroelectronics SUREProgram and other relevant qual­ity 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

3. Depends on range.

Ambient Operating Temperature
Temperature Under Bias –50 to 125 °C
Storage Temperature –65 to 150 °C

Input or Output Voltage (except A9) –2 to 7 V
Supply Voltage –2 to 7 V
A9 Voltage –2 to 13.5 V
Program Supply Voltage –2 to 14 V

+0.5V with possible overshoot to VCC+2V for a period less than 20ns.

CC

(1)

(3)

–40 to 125 °C

Table 3. Operating Modes

Mode E GV

Read Word-wide
Read Byte-wide Upper V
Read Byte-wide Lower
Output Disable
Program
Program Inhibit
Standby
Electronic Signature

Note: X = VIHor VIL,VID= 12V ± 0.5V.

V

V
V

V

Pulse V

IL

V

IH

V

IH

V

PP

IL

IL

IL

IL

IL

V

IL

V

IL

V

IL

V

IH

PP

V

PP

X X X Hi-Z Hi-Z Hi-Z

V

IL

BYTE A9 Q0-Q7 Q8-Q14 Q15A–1

V

IH

V

IL

V

IL

X X Hi-Z Hi-Z Hi-Z

V

IH

V

IH

V

IH

X Data Out Data Out Data Out
X Data Out Hi-Z V
X Data Out Hi-Z

X Data In Data In Data In
X Hi-Z Hi-Z Hi-Z

V

ID

Codes Codes Code

Table 4. Electronic Signature

Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data

Manufacturer’s Code
Device Code V

Note: Outputs Q8-Q15 are set to ’0’.

V

IL

IH

00100000 20h
00110010 32h

M27C320

IH

V

IL

DEVICE OPERATION

The operatingmodes ofthe M27C320 are listed in
the OperatingModes Table.A single power supply
is required in the read mode. All inputs are TTL
compatible except for VPPand 12V on A9 for the
Electronic Signature.

Read Mode

The M27C320 has two organisations, Word-wide
and Byte-wide.The organisationis selected by the
signal level ontheBYTE pin. WhenBYTE is at V

IH

the Word-wide organisation is selected and the
Q15A–1 pin is used for Q15 Data Output. When
the BYTE pin is at VILthe Byte-wide organisation
is selected andthe Q15A–1 pin is used for the Ad­dress Input A–1. When the memory is logically re­garded as 16 bit wide, but read in the Byte-wide
organisation, then with A–1 at VILthe lower 8 bits
of the 16 bit data are selected and with A–1at V

IH

the upper 8 bits of the 16 bit data are selected.

The M27C320 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 thepower control andshould be
used fordevice 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 ad­dress access time (t
from E to output (t

ELQV

output after a delay of t

) is equal to the delay

AVQV

). Data is available at the

from the falling edge

GLQV

of G, assuming that E has been low and the ad­dresseshave beenstable for atleast t

AVQV-tGLQV

Standby Mode

The M27C320 has standby mode which reduces
the supply current from 50mA to 100µA. The
M27C320 is placedin the standby modeby apply­ing aCMOS high signal to the Einput. Whenin the
standby mode, the outputs are in a high imped­ance state, independent of the G input.

.

3/15

M27C320

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. Testing Input Output Waveform

High Speed

3V

1.5V

0V

Standard

2.4V

0.4V

Table 6. Capacitance

(1)

(TA=25°C, f = 1 MHz)

2.0V

0.8V

AI01822

Figure 4. AC Testing Load Circuit

1.3V

1N914

3.3kΩ

DEVICE
UNDER

TEST

C

L

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

Symbol Parameter Test Condition Min Max Unit

V

C

IN

C

OUT

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

Input Capacitance
Output Capacitance V

=0V

IN

=0V 12 pF

OUT

10 pF

OUT

AI01823B

Two Line Output Control

Because EPROMs are usually used in larger
memory arrays, this product features a 2 line con­trol function which accommodates the use of mul­tiple 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.

4/15

For the most efficient use of these two control
lines, Eshould be decoded and used astheprima­ry 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 deselect­ed 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.

M27C320

Table 7. Read Mode DC Characteristics

(1)

(TA= 0 to 70 °C; VCC=5V±10%)

Symbol Parameter Test Condition Min Max Unit

I

I

I

CC

I

CC

I

CC

I
V

V

IH

V

V

Note: 1. VCCmust be applied simultaneously with or before VPPand removed simultaneously or after VPP.

Input Leakage Current

LI

Output Leakage Current

LO

Supply Current

1

Supply Current (Standby) TTL

2

Supply Current (Standby) CMOS
Program Current

PP

Input Low Voltage –0.3 0.8 V

IL

(2)

Input High Voltage 2
Output Low Voltage

OL

Output High Voltage TTL

OH

2. Maximum DC voltage on Output is V

CC

+0.5V.

E=V

E=V

0V ≤ V

IL

IL

0V ≤ V

,G=VIL,I

,G=VIL,I

E>VCC– 0.2V

I

IN

OUT

f = 8MHz

f = 5MHz

E=V

V

PP=VCC

I

= 2.1mA

OL

=–400µA

OH

≤ V

≤ V

IH

OUT

OUT

CC

CC

= 0mA,

= 0mA,

2.4 V

±1 µA

±10 µA

70 mA

50 mA

1mA

100 µA

10 µA

V

+1

CC

0.4 V

V

System Considerations

The power switching characteristics of Advanced
CMOS EPROMs require carefull decoupliing of
the suppliesto the devices. The supply current I

CC

has three segments of importance to the system
designer: the standby current, the active current
and the transient peaks that are produced by the
falling and rising edges of E.

The magnitude of the transient current peaks is
dependant on the capacititive and inductive load­ing of the device outputs. The associatedtransient
voltage peaks can be supressed by complying
with the two line output control and byproperly se­lected decoupling capacitors. It is recommended
that a 0.1µF ceramic capacitor is used on every
device between VCCand VSS. This should be a
high frequency type of low inherent inductance
and should be placed as close as possible to the
device. In addition, a 4.7µF electrolytic capacitor

should be used between VCCand VSSfor every
eight devices. This capacitor should be mounted
near the power supply connection point. The pur­pose of this capacitor is to overcome the voltage
drop caused by the inductive effects of PCB trac­es.

Programming

When delivered, allbits of the M27C320 arein the
’1’ state. Data is introduced by selectively pro­gramming ’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
M27C320 is in the programming mode when V

PP

input is at 12.5V, G is at VIHand Eis pulsedto VIL.
The data to be programmed isapplied to 16 bitsin
parallel to the data outputpins. Thelevels required
for the address and data inputs are TTL. VCCis
specified to be 6.25V ± 0.25V.

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