Datasheet SMJ27C256-15JM, SMJ27C256-17JM, SMJ27C256-20JM, SMJ27C256-25JM, SMJ27C256-30JM Datasheet (AUSTIN)

Austin Semiconductor, Inc.

UVEPROM

SMJ27C256

256K UVEPROM

UV Erasable Programmable
Read-Only Memory

A V AILABLE AS MILIT AR Y
SPECIFICA TIONS

• SMD 5962-86063

• MIL-STD-883

FEATURES

• Organized 32,768 x 8

• Single +5V ±10% power supply

• Pin-compatible with existing 256K ROM’s and
EPROM’s

• All inputs/outputs fully TTL compatible

• Power-saving CMOS technology

• Very high-speed SNAP! Pulse Programming

• 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

• Low power dissipation (CMOS Input Levels)

PActive - 165mW Worst Case
PStandby - 1.7mW Worst Case (CMOS-input levels)

OPTIONS MARKING

• Timing

150ns access -1 5
170ns access -1 7
200ns access -2 0
250ns access -25
300ns access -3 0

• Package(s)

Ceramic DIP (600mils) J No. 110

• 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)

V

1

PP

2

A12

3

A7

4

A6

5

A5

6

A4

7

A3

8

A2

9

A1

10

A0

11

DQ0

12

DQ1

13

DQ2

14

GND

Pin Name Function

A0 - A14 Address Inputs

DA0-DQ7 Inputs (programming)/Outputs

E\ Chip Enable/Power Down
G\ Output Enable

GND Ground

V
V

5V Supply

CC

13V Programming Power Supply

PP

Vcc

28

A14

27

A13

26

A8

25

A9

24

A11

23

G\

22

A10

21

E\

20

DQ7

19
18

DQ6

17

DQ5

16

DQ4

15

DQ3

GENERAL DESCRIPTION

The SMJ27C256 series is a set of 262,144 bit, ultraviolet­light erasable, electrically programmable read-only
memories. These devices are fabricated using power-saving
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 without the
use of external pullup resistors. 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 SMJ27C256 is pin-compatible with
28-pin 256K ROMs and EPROMs. It is offered in a 600mil
dual-in-line ceramic pagackage (J suffix) rated for operation
from -55°C to 125°C.
Because this EPROM operates from a single 5V supply (in
the read mode), it is ideal for use in microprocessor-based
systems. One other supply (13V) is needed for programming.
All programming signals are TTL level. This device is
programmable by the SNAP! Pulse programming algorithm.

The SNAP! Pulse programming algorithm uses a VPP of 13V
and a VCC of 6.5V for a nominal programming time of four

seconds. For programming outside the system, existing
EPROM programmers can be used. Locations can be
programmed singly, in blocks, or at random.

SMJ27C256

Rev. 1.0 9/01

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

1

Austin Semiconductor, Inc.

9

FUNCTIONAL BLOCK DIAGRAM*

EPROM 32,768 x 8

10

A0
A1

8

A2
A3

6

A4
A5 DQ0

4

A6 DQ1
A7 DQ2

25

A8 DQ3

24

A9 DQ4

E\

G\

21
23

2

26

27
20

22

[PWR DWN]

&

A10 DQ5
A11 DQ6
A12 DQ7
A13
A14

A

EN

0

32,767

A
A
A
A
A
A
A
A

11
12
13
15

16
17
18
19

UVEPROM

SMJ27C256

* This symbol is in accordance with ANSI/IEEE std 91-1984 and IEC Publication 617-12.

OPERATION

The seven modes of operation for the SMJ27C256 are listed in Table 1. The read mode requires a single 5V supply. All
inputs are TTL level except for VPP during programming (13V for SNAP! Pulse), and (12V) on A9 for signature mode.

T ABLE 1. OPERA TION MODES

2

V

V

V

PP

V

CC

MODE*

PROGRAM

INHIBIT

IL

IH

V

IH

V

IL

V

PP

V

CC

V

IH

X

V

PP

V

CC

SIGNATURE MODE

V
V

V

ID

V

IL

CODE

MFG DEVICE

97

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

V

IL

V

IL
CC
CC

V
V

04

FUNCTION

(PINS)

E\ (20)
G\ (22)
V

(1) V

PP

V

(28) V

CC

READ

V
V

IL

IL
CC
CC

OUTPUT

DISABLE

V

IL

V

IH

V

CC

V

CC

STANDBY PROGRAMMING VERIFY

V

IH

X

V

CC

V

CC

A9 (24) X X X X X X
A0 (10) X X X X X X

DQ0-DQ7

(11-13, 15-19)

* X can be VIL or VIH.

SMJ27C256

Rev. 1.0 9/01

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

ID
IH

Austin Semiconductor, Inc.

UVEPROM

SMJ27C256

READ/OUTPUT DISABLE

When the outputs of two or more SMJ27C256s are connected
in parallel on the same bus, the output of any particular device
in the circuit can be read with no interference from the
competing outputs of the other devices. T o read the output of
the selected SMJ27C256, a low-level signal is applied to E\
and G\. 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 DQ0 through DQ7.

LA TCHUP IMMUNITY

Latchup immunity on the SMJ27C256 is a minimum of 250mA
on all inputs and outputs. This feature provides latchup
immunity beyond any potential transients at the printed
circuit board level when the EPROM is interfaced to industry
standard TTL or MOS logic devices. Input/output layout
approach controls latchup without compromising performance
or packing density.

POWER DOWN

Active ICC supply current can be reduced from 25mA
(SMJ27C256-15 through SMJ27C256-25) to 500µA (TTL­level inputs) or 300µA (CMOS-level inputs) by applying a high
TTL/CMOS signal to the E\ pin. In this mode all outputs are
in the high-impedance state.

ERASURE

Before programming, the SMJ27C256 is erased by exposing
the chip through the transparent lid to a high-intensity ultra­violet light (wavelength 2537 Å). EPROM erasure before
programming is necessary to ensure that all bits are in the
logic-high state. Logic-lows are programmed into the desired
locations. A programmed logic-low can be erased only by
ultraviolet light. The recommended minimum exposure dose
(UV intensity x exposure time) is 15W•s/cm2. A typical
12mW/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
SMJ27C256, the window should be covered with an opaque
label.

SNAP! PULSE PROGRAMMING

The SMJ27C256 EPROM is programmed by using the SNAP!
Pulse programming algorithm as illustrated by the flowchart
in Figure 1. This algorithm programs the device in a nominal
time of 4 seconds. Actual programming time varies as a
function of the programmer used.

Data is presented in parallel (eight bits) on pins DQ0 to DQ7.
Once addresses and data are stable, E\ is pulsed.

The SNAP! Pulse programming algorithm uses initial pulses
of 100 microseconds (µs) followed by a byte-verification step
to determine when the addressed byte has been successfully
programmed. Up to ten 100µs pulses per byte are provided
before a failure is recognized.

The programming mode is achieved when V
VCC= 6.5V, G\ = VIH, and E\ = VIL. More than one device can

be programmed when the devices are connected in parallel.
Locations can be programmed in any order. When the SNAP!
Pulse programming routine is completed, all bits are verified

with VCC = VPP = 5V.

PP

= 13V,

PROGRAM INHIBIT

Programming can be inhibited by maintaining a high-level
input on E\.

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 device type. This mode is
activated when A9 is forced to 12V ±0.5V. Two identifier

bytes are accessed by A0 (terminal 10); i.e., A0=VIL accesses
the manufacturer code, which is output on DQ0-DQ7; A0=V

accesses the device code, which is also output on DQ0-DQ7.
All other addresses must be held at VIL. Each byte contains
odd parity on bit DQ7. The manufacturer code for these
devices is 97h and the device code is 04h.

IH

SMJ27C256

Rev. 1.0 9/01

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

3

UVEPROM

SMJ27C256

Austin Semiconductor, Inc.

FIGURE 1. SNAP! PULSE PROGRAMMING FLOW CHART

START

Address = First Location

Increment

Address

VCC = 6.5V, VPP = 13V

Program One Pulse = tW = 100µs

Last

Address?

Yes

Address = First Location

X = 0

Program One Pulse = t

Verify

Byte

Pass

Fail

X = X+1

Increment Address

= 100µs

W(E)PR

No

X = 10?

Program

Mode

Interactive

Mode

SMJ27C256

Rev. 1.0 9/01

No

VCC = VPP = 5V ± 10%

Last

Address?

Yes

Compare
All Bytes

to Original

Data

Pass

Device Passed

Fail

4

Yes

Device Failed

Final

Verification

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

Austin Semiconductor, Inc.

UVEPROM

SMJ27C256

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage Range, VCC**...........................-0.6V to +7.0V

Supply Voltage Range, Vpp**.........................-0.6V to +14.0V

Input Voltage Range, All inputs except A9**..-0.6V to +6.5V

A9.....-0.6V to +13.5V

Output Voltage Range**...............................-0.6V to VCC +1V

Minimum Operating Free-air Temperature, TA..............-55°C

*Stresses greater than those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
these or any other conditions above those indicated in the
operation section of this specification is not implied.
Exposure to absolute maximum rating conditions for extended
periods may affect reliability.

** All voltage values are with respect to GND.

Maximum Operating Case T emperature, TC...................125°C

Storage Temperature Range, T

.....................-65°C to 150°C

stg

RECOMMENDED OPERA TING CONDITIONS

V

V

NOTES:

1. VCC must be applied before or at the same time as VPP and removed after or at the same time as VPP. The deivce must not be inserted into or removed from the
board when VPP or VCC is applied.

2. VPP can be connected to VCC directly (except in the program mode). VCC supply current in this case would be I

Supply Voltage

CC

Supply Voltage

PP

High-level input voltageV

IH

Low-level input voltage

V

IL

Voltage level on A9 for signature mode

V

ID

Operating free-air temperature

T

A

Operating case temperature

T

C

Read Mode
SNAP! Pulse programming algorithm

Read Mode
SNAP! Pulse programming algorithm

1

2

TTL inputs 2
CMOS inputs

TTL inputs -0.5 0.8 V
CMOS inputs -0.5 0.2 V

MIN TYP MAX UNIT

4.5 5 5.5 V

6.25 6.5 6.75 V

-0.6

V

CC

12.75 13 13.25 V
V

+1

CC

-0.2 VCC+1

V

CC

11.5 13 V

-55 °C
+125 °C

+ I

.

CC2

PP1

V

V
V

ELECTRICAL CHARACTERISTICS O VER RECOMMENDED RANGES OF SUPPLY V OL TA GE AND
OPERA TING FREE-AIR TEMPERA TURE

1

PARAMETER

High-level output voltage

V

OH

Low-level output voltage

V

OL

Input current (leakage)

I

I

Output current (leakage)

I

O

supply current

V

I
I

I

CC1VCC

I

CC2VCC

I

NOTES:

1. Typical values are at TA=25°C and nominal voltages.

2. This parameter has been characterized at 25°C and is not tested.

SMJ27C256

Rev. 1.0 9/01

PP

PP1

V

PP2

OS

supply current (during program pulse)

PP

supply current (standby)

supply current (active)

Output current (leakage)

2

TTL-Input Level
CMOS-Input Level
'27C256-15

'27C256-17
'27C256-20
'27C256-25

TEST CONDITIONS MIN

IOH = -400µA
IOL = 2.1mA
VI = 0V to 5.5V
VO = 0V to V
VPP = VCC = 5.5V
VPP = 13V

= 5.5V, E\=V

V

CC

= 5.5V, E\=V

V

CC

E\=V
t

cycle

open

CC

IH
CC

, VCC=5.5V

IL

= minimum, outputs

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

5

2.4 V

TYP

35 50 mA

15 25 mA

MAX UNIT

0.4 V
±1 µA
±1 µA
10 µA

500 µA
300 µA

100 mA

UVEPROM

SMJ27C256

Austin Semiconductor, Inc.

CAP A CIT ANCE O VER RECOMMENDED RANGES OF SUPPLY V OL TAGE AND OPERATING
FREE-AIR TEMPERATURE, f = 1MHz*

PARAMETER

C

C

* Capacitance measurements are made on a sample basis only.
** T ypical values are at T

Input capacitance

i

Output capacitance

o

= 25°C and nominal voltages.

A

SWITCHING CHARACTERISTICS O VER RECOMMENDED RANGES OF SUPPLY V OL TAGE
AND OPERA TING FREE-AIR TEMPERATURE

PARAMETER

Access time from address 150 170 ns

t

a(A)

Access time from E\ 150 170 ns

t

a(E)

t

en(G)R

Output enable time from G\ 70 70 ns
Disable time of output from G\ or E\,

t

dis

whichever occurs first
Output data valid time after change of

t

v(A)

address, E\, or G\, whichever occurs first

TEST CONDITIONS TYP** MAX UNIT

= 0V

V

I

= 0V

V

O

610pF

10 14 pF

1,2

TEST

CONDITIONS

1, 2

-15

MIN MAX MIN MAX

see Figure 2

3

3

055055 ns

00 ns

-17
UNIT

PARAMETER

Access time from address 200 250 300 ns

t

a(A)

Access time from E\ 200 250 300 ns

t

a(E)

t

en(G)R

NOTES:

1.Timing measurements are made at 2V for logic high and 0.8V for logic low (see figure 2).

2. Common test conditions apply for t

3. V alue calculated from 0.5V delta to measured output level. This parameter is only sampled and not 100% tested.

Output enable time from G\ 75 100 120 ns
Disable time of output from G\ or E\,

t

dis

whichever occurs first
Output data valid time after change of

t

v(A)

address, E\, or G\, whichever occurs first

3

except during programming.

dis

3

TEST

CONDITIONS

see Figure 2

1, 2

-20 -25

MIN MAX MIN MAX MIN MAX

0 60 0 60 0 105 ns

000 ns

-30
UNIT

SWITCHING CHARACTERISTICS FOR PROGRAMMING: VCC = 6.5V and VPP = 13V (SNAP!
Pulse), TA = 25°C

MIN MAX UNIT

t

dis(G)

t

en(G)W

PARAMETER

Output disable time from G\ 0 130 ns
Output enable time from G\ 150 ns

SMJ27C256

Rev. 1.0 9/01

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

6

UVEPROM

SMJ27C256

Austin Semiconductor, Inc.

RECOMMENDED TIMING REQUIREMENTS FOR PROGRAMMING: VCC = 6.5 and VPP = 13
(SNAP! Pulse), TA = 25°C (See Figure 2)

MIN TYP MAX UNIT

t

h(A)

t

h(D)

t

w(E)PR

t

su(A)

t

su(G)

t

su(E)

t

su(D)

t

su(VPP)

t

su(VCC)

Hold Time, Address
Hold Time, Data
Pulse Duration, Initial Program
Setup Time, Address
Setup Time, G\
Setup Time, E\
Setup Time, Data
Setup Time, V
Setup Time, V

PP
CC

0µs
2µs

95 100 105 µs

2µs
2µs
2µs
2µs
2µs
2µs

P ARAMETER MEASUREMENT INFORMA TION

2.08V

RL = 800Ω

Output Under Test

CL = 100 pF

NOTES:

1. CL includes probe and fixture capacitance.

1

The AC testing inputs are driven at 2.4V for logic high and 0.4V for logic low . Timing measurements are
made at 2V for logic high and 0.8V for logic low for both inputs and outputs.

SMJ27C256

Rev. 1.0 9/01

FIGURE 2. LOAD CIRCUIT AND VOLTAGE WAVEFORMS

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7

Austin Semiconductor, Inc.

FIGURE 3. READ-CYCLE TIMING

UVEPROM

SMJ27C256

FIGURE 4. PROGRAM-CYCLE TIMING (SNAP! PULSE PROGRAMMING)

SMJ27C256

Rev. 1.0 9/01

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

8

Austin Semiconductor, Inc.

MAX

MECHANICAL DEFINITION*

ASI Case #110 (Package Designator CW)

SMD 5962-86063, Case Outline X

UVEPROM

SMJ27C256

D

E

S1

eA

SMD SPECIFICATIONS

SYMBOL

A --- 0.232

b 0.014 0.026

b2 0.045 0.065

c 0.008 0.018
D --- 1.490
E 0.500 0.610

eA

e

L 0.125 0.200
Q 0.015 0.060

S1 0.005 --­S2 0.005 ---

NOTE: These dimensions are per the SMD. ASI's package dimensional limits
may differ, but they will be within the SMD limits.

MIN

0.600 BSC

0.100 BSC

b2

c

e

b

S2

A

Q

L

*All measurements are in inches.

SMJ27C256

Rev. 1.0 9/01

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

9

Austin Semiconductor, Inc.

ORDERING INFORMATION

UVEPROM

SMJ27C256

EXAMPLE:

Device

Number

SMJ27C256 -15 J *
SMJ27C256 -17 J *
SMJ27C256 -20 J *
SMJ27C256 -25 J *
SMJ27C256 -30 J *

SMJ27C256-30JM

Speed ns

Package

Type

Operating

Temp.

*A V AILABLE PROCESSES

M = Extended T emperature Range -55oC to +125oC

SMJ27C256

Rev. 1.0 9/01

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

10

Austin Semiconductor, Inc.

ASI TO DSCC PART NUMBER

CROSS REFERENCE*

ASI Pac kage Designator J

TI Part #** SMD Part #

SMJ27C256-15JM 5962-8606305XA
SMJ27C256-17JM 5962-8606304XA
SMJ27C256-20JM 5962-8606301XA
SMJ27C256-25JM 5962-8606302XA
SMJ27C256-30JM 5962-8606303XA

UVEPROM

SMJ27C256

* ASI part number is for reference only. Orders received referencing the SMD part number will be processed per the SMD.
** Parts are listed on SMD under the old Texas Instruments part number. ASI purchased this product line in November of 1999.

SMJ27C256

Rev. 1.0 9/01

11

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