AUSTIN SMJ27C040-12JM, SMJ27C040-15JM Datasheet

Austin Semiconductor, Inc.

UVEPROM

SMJ27C040

4 MEG UVEPROM

UV Erasable Programmable
Read-Only Memory

A V AILABLE AS MILIT AR Y
SPECIFICA TIONS

• SMD 5962-91752

• MIL-STD-883

FEATURES

• Organized 524,288 x 8

• Single +5V ±10% power supply

• Industry standard 32-pin dual-in-line package

• All inputs/outputs fully TTL compatible

• Static Operation (no clocks, no refresh)

• 8-bit output for use in microprocessor-based systems

• Power-saving CMOS technology

• 3-state output buffers

• 400-mV DC assured noise immunity with standarad
TTL loads

• Latchup immunity of 250 mA on all input and output
pins

• No pullup resistors required

• Low power dissipation (Vcc = 5.5V)

PActive - 385 mW Worst Case
PStandby - 0.55 mW Worst Case (CMOS-input levels)

OPTIONS MARKING

• Timing

120ns access -1 2
150ns access -1 5

• Package(s)

Ceramic DIP (600mils) J No. 114

• Operating Temperature Ranges

Military (-55oC to +125oC) M

For more products and information

please visit our web site at

www.austinsemiconductor .com

PIN ASSIGNMENT

(Top View)

32-Pin DIP (J)

(600 MIL)

1

V

PP

2

A16

3

A15

4

A12

5

A7

6

A6

7

A5

8

A4

9

A3

10

A2

11

A1

12

A0

13

DQ0

14

DQ1

15

DQ2

16

GND

Pin Name Function

A0 - A18 Address Inputs

DA0-DQ7 Inputs (programming)/Outputs

E\ Chip Enable
G\ Output Enable

GND Ground

V

5V Supply

CC

V

13V Power Supply*

PP

*Only in program mode.

Vcc

32

A18

31

A17

30

A14

29

A13

28

A8

27

A9

26

A11

25

G\

24

A10

23
22

E\

21

DQ7

20

DQ6

19

DQ5

18

DQ4

17

DQ3

GENERAL DESCRIPTION

The SMJ27C040 is a set of 4,194,304-bit, ultraviolet-light
erasable, electrically programmable read-only memories
(EPROMs).
These devices are fabricated using CMOS technology for
high speed and simple interface with MOS and bipolar
circuits. All inputs (including program data inputs) can be
driven by Series 54 TTL circuits. Each output can drive one
Series 54 TTL circuit without external resistors. The data
outputs are 3-state for connecting multiple devices to a
common bus.
The SMJ27C040 is offered in a 32-pin 600-mil
dual-in-line ceramic package (J suffix) rated for operation
from -55°C to 125°C.
Since this EPROM operates from a single 5V supply (in
the read mode), it is ideal for use in microprocessor-based
systems. One other (13V) supply is needed for programming.
All programming signals are TTL level. For programming
outside the system, existing EPROM programmers can be
used.

SMJ27C040

Rev. 1.0 9/01

Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.

1

Austin Semiconductor, Inc.

FUNCTIONAL BLOCK DIAGRAM*

EPROM 524,288 x 8

12

A0

11

A1

10

A2
A3

8

A4
A5 DQ0

6

A6 DQ1
A7 DQ2

27

A8 DQ3

26

A9 DQ4

23

A10 DQ5

25

A11 DQ6

4

A12 DQ7

28

A13

29

A14

3

A15

2

A16

30

A17

31

A18

22

E\

G\

24

[PWR DWN]

&

A

EN

0

524,287

A
A
A
A
A
A
A
A

UVEPROM

SMJ27C040

13
14
15
17
18

19
20
21

* This symbol is in accordance with ANSI/IEEE std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the J package.

OPERATION

The seven modes of operation are listed in Table 1. The read mode requires a single 5V supply. All inputs are TTL level
except for VPP during programming (13V), and VH (12V)i on A9 for signature mode.

T ABLE 1. OPERA TION MODES

FUNCTION

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

CC

Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.

A9 A0 DQ0-DQ7

X X Data Out
X X High-Z
X X High-Z
X X Data In
X X High-Z
X X Data Out

V

V

*Signature Mode V

IH

IL

V

IL

MFG Code 97

Device Code 50

2

Read
Output Disable
Standby
Programming
Program Inhibit
Verify

* X can be VIL or VIH.
iVH = 12V ± 0.5V

SMJ27C040

Rev. 1.0 9/01

E\ G\

V

IL

V

IL

V

IH

V

IL

V

IH

V

IH

V

IL

V

PP

V

IL

V

IH

X

V

IH

V

IH

V

IL

V

IL

V

CC

V

CC

V

CC

V

PP

V

PP

V

PP

V

CC

Austin Semiconductor, Inc.

UVEPROM

SMJ27C040

READ/OUTPUT DISABLE

When the outputs of two or more SMJ27C040s are connected
in parallel on the same bus, the output of any particular device
in the circuit can be read with no interference from
competing outputs of the other devices. T o read the output of
a single device, a low level signal is applied to the E\ and G\
pins. All other devices in the circuit should have their outputs
disabled by applying a high level signal to one of these pins.
Output data is accessed at pins Q0-Q7.

LA TCHUP IMMUNITY

Latchup immunity on the SMJ27C040 is a minimum of 250mA
on all inputs and outputs. This feature provides latchup
immunity beyond any potential transients at the P .C. board level
when the EPROM is interfaced to industry standard TTL or
MOS logic devices. The input/output layout approach
controls latchup without compromising performance or
packing density .

POWER DOWN

Active ICC supply current can be reduced from 70mA to 1mA
for a high TTL input on E\ and to 100µA for a high CMOS
input on E\. In this mode all outputs are in the high­impedance state.

ERASURE

Before programming, the SMJ27C040 EPROM is erased by
exposing the chip through the transparent lid to a high
intensity ultraviolet-light (wavelength 2537 Å). The
recommended minimum exposure dose (UV intensity x

exposure time) is 15-W.s/cm2. A typical 12-mW/cm2,
filterless UV lamp erases the device in 21 minutes. The lamp
should be located about 2.5cm above the chip during erasure.
After erasure, all bits are in the high state. It should be noted
that normal ambient light contains the correct wavelength for
erasure. Therefore, when using the SMJ27C040, the window
should be covered with an opaque label. After erasure (all
bits in logic high state), logic lows are programmed into the
desired locations. A programmed low can be erased only by
ultraviolet light.

SNAP! PULSE PROGRAMMING

The SMJ27C040 is programmed by using the SNAP! Pulse
programming algorithm. The programming sequence is shown
in the SNAP! Pulse programming flow chart (Figure 1).

The initial setup is V

= 13V, V

PP

= 6.5V, E\ = VIH, and

CC

G\ = VIL. Once the initial location is selected, the data is
presented in parallel (eight bits) on pins DQ1 through DQ8.
Once addresses and data are stable, the programming mode is
achieved when E\ is pulsed low (VIL) with a pulse duration of

t

. Every location is programmed only once before

W(PGM)

going to interactive mode.

In the interactive mode, the word is verified at V

= 13V,

PP

VCC= 6.5V, E\ = VIH, and G\ = VIL. If the correct data is not
read, the programming is performed by pulling G\ high, then
E\ low with a pulse duration of t

. This sequence of

W(PGM)

verification and programming is performed up to a maximum
of 10 times. When the device is fully programmed, all bytes

are verified with VCC = VPP = 5V ± 10%.

PROGRAM INHIBIT

Programming can be inhibited by maintaining high level
inputs on the E\ and G\ pins.

PROGRAM VERIFY

Programmed bits can be verified with VPP = 13V when
G\ = VIL, and E\ = VIH.

SIGNA TURE MODE

The signature mode provides access to a binary code
identifying the manufacturer and type. This mode is activated
when A9 (pin 26) is forced to 12V. Two identifier bytes are
accessed by toggling A0. All other addresses must be held
low. The signature code for the SMJ27C040 is 9750. A0 low
selects the manufacturer’s code 97 (Hex), and A0 high
selects the device code 50 (Hex), as shown in Table 2.

TABLE 2. SIGNATURE MODES

IDENTIFIER*

MANUFACTURER CODE
DEVICE CODE

* E\ = G\ = VIL, A1 - A8 = VIL, A9 = VH, A10 - A18 = VIL, VPP = VCC.

SMJ27C040

Rev. 1.0 9/01

A0 DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 HEX

V

IL

V

IH

1001011197
0101000050

3

PINS

Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.

UVEPROM

SMJ27C040

Austin Semiconductor, Inc.

FIGURE 1. SNAP! PULSE PROGRAMMING FLOW CHART

START

Address = First Location

Increment

Address

VCC = 6.5V ± 0.25V, VPP = 13V ± 0.25V

Program One Pulse = tW = 100µs

Last

Address?

Yes

Address = First Location

X = 0

Verify

One

Byte

Pass

Fail

Increment Address

Program One Pulse = tW = 100µs

No

X = X+1

X = 10?

Program

Mode

Interactive

Mode

SMJ27C040

Rev. 1.0 9/01

No

VCC = VPP = 5V ± 0.5V

Last

Address?

Yes

Compare
All Bytes

to Original

Data

Pass

Device Passed

Fail

Yes

Device Failed

Final

Verification

Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.

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