Rainbow Electronics AT27C4096 User Manual

Features

•

Fast Read Access Time - 55 ns

•

Low Power CMOS Operation

– 100 µA Maximum Standby
– 40 mA Maximum Active at 5 MHz

•

JEDEC Standard Packages

– 40-Lead 600 mil PDIP
– 44-Lead PLCC
– 40-Lead VSOP (10 mm x 14 mm)

•

Direct Upgrade from 512K-bit, 1M-bit, and 2M-bit
(AT27C516, AT27C1024, and AT27C2048) EPROMs

±±±±

•

5V

10% Power Supply

•

High Reliability CMOS Technology

– 2,000V ESD Protection
– 200 mA Latchup Immunity

•

Rapid™ Programming Algorithm - 50 µs/word (typical)

•

CMOS and TTL Compatible Inputs and Outputs

•

Integrated Product Identification Code

•

Commercial and Industrial Temperature Ranges

Description

The AT27C4096 is a low-power, high-performance 4,194,304-bit one-time program­mable read only memor y (OTP EP ROM) or ganiz ed 256K by 16 bits . It re quires a sin­gle 5V power su pply i n norma l read mode o peratio n. Any word c an be a ccessed in

(continued)

Pin Configurations

Pin Name Function

A0 - A17 Addresses
O0 - O15 Outputs
CE
OE
NC No Connect

Note: Both GND pins must be connected.

Chip Enable
Output Enable

O12
O11
O10

O9
O8

GND

NC
O7
O6
O5
O4

PLCC Top View

O13

O14

O15CEVPPNCVCC

65432

7
8
9
10
11
12
13
14
15
16
17

1819202122232425262728

O3O2O1

O0

OE

1

NC

A17

4443424140

A0A1A2A3A4

A16

A15

A14

39
38
37
36
35
34
33
32
31
30
29

A13
A12
A11
A10
A9
GND
NC
A8
A7
A6
A5

4-Megabit
(256K x 16)
OTP EPROM

AT27C4096

PDIP Top View

1

VPP

2

CE

3

O15

4

O14

5

O13

6

O12

7

O11

8

O10

9

O9

10

O8

11

GND

12

O7

13

O6

14

O5

15

O4

16

O3

17

O2

18

O1

19

O0

20

OE

VSOP Top View

40

VCC

39

A17

38

A16

37

A15

36

A14

35

A13

34

A12

33

A11

32

A10

31

A9

30

GND

29

A8

28

A7

27

A6

26

A5

25

A4

24

A3

23

A2

22

A1

21

A0

A10
A11
A12
A13
A14
A15
A16

A17
VCC
VPP

O15

O14

O13

O12

O11

O10

1

A9

2
3
4
5
6
7
8
9
10
11
12

CE

13
14
15
16
17
18
19

O9

20

O8

Type 1

40

GND

39

A8

38

A7

37

A6

36

A5

35

A4

34

A3

33

A2

32

A1

31

A0

30

OE

29

O0

28

O1

27

O2

26

O3

25

O4

24

O5

23

O6

22

O7

21

GND

Rev. 0311F–10/98

1

less than 55 ns, eliminating the need for speed-reducing
WAIT states. The by-16 organization makes this part ideal
for high-performance 16- and 32-bit microprocessor sys­tems.

In read mode, the AT27C4096 typically consumes 15 mA.
Standby mode supply current is typically less than 10 µA.

The AT27C4096 is available in industry standard
JEDEC-approved one-tim e programmable (OTP) plastic
PDIP, PLCC, and VSOP packages . The device features
two-line control (CE
high-speed systems.

With high density 256K word storage capability, the
AT27C4096 allows firmware to be stored reliably and to be
accessed by the system without the delays of mass storage
media.

Atmel’s AT27C4096 has additional features that ensure
high quality and efficient productio n use. The Rapid
gramming Algorithm reduces the time required to program
the part and guarantees reliable programming. Program­ming time is typically only 50 µs/word. The Integrated Prod­uct Identif ication Code ele ctronica lly iden tifies the dev ice

, OE) to eliminate bus contention in

™

Pro-

Block Diagram

and manufacturer. This feature is used by industry stan­dard programming equipment to select the proper program­ming algorithms and voltages.

System Considerations

Switching between active and standby conditions via the
Chip Enable pin may produ ce tra ns ien t vo ltag e ex cu rs i ons .
Unless accommodated by the system design, these tran­sients may exceed data sheet limits, resulting in device
non-conforma nce. At a min imum, a 0. 1 µF high fr equency ,
low inherent inductance, ceramic capacitor should be uti­lized for each device. This capacitor should be connected
between the V
close to the device as possible. Additionally, to stabilize the
supply voltage level on printed circuit boards with large
EPROM arrays, a 4.7 µF bulk electrolytic capacitor should
be utilized, again connected between the V
terminals. This capacitor should be positioned as close as
possible to the point where the power supply is connected
to the array.

and Ground terminals of the device, as

CC

and Ground

CC

2

AT27C4096

Absolute Maximum Ratings*

Temperature Under Bias................................ -55°C to +125°C

Storage Temperature..................................... -65°C to +150°C

Voltage on Any Pin with

Respect to Ground .........................................-2.0V to +7.0V

Voltage on A9 with

Respect to Ground ......................................-2.0V to +14.0V

AT27C4096

*NOTICE: Stresses beyond those listed under “Absolute

Maximum Ratings” may cause permanent dam­age to the dev ice . This is a s tress rating only an d
functional oper ation of the de vi ce at these or any

(1)

(1)

other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions f or e xtended periods ma y af fect de vice
reliability .

VPP Supply Voltage with

Respect to Ground .......................................-2.0V to +14.0V

(1)

Note: 1. Maximum voltage is -0.6V dc which may undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is

V

+ 0.75V dc which may overshoot to +7.0V for pulses of less than 20 ns.

CC

Operating Modes

Mode/Pin CE OE Ai V

Read V

IL

Output Disable X V
Standby V
Rapid Program

(2)

PGM Verify V
PGM Inhibit V

Product Identification

(4)

IH

V

IL

IH

IH

V

IL

V

IL

IH

Ai X

XXHigh Z

XXX

V

IH

V

IL

V

IH

V

IL

Ai V
Ai V

XV

A9 = V

(3)

H

A0 = VIH or VIL
A1 - A17 = V

IL

Notes: 1 . X can be VIL or VIH.

2. Refer to the Programming characteristics.
= 12.0 ± 0.5V.

3. V

H

4. Two identifier w ord s may be selected. All Ai inputs are held low (VIL), except A9, which is set to VH, and A0, which is to ggl ed

low (V

5. Standby V

) to select the Manufacturer’s Identification word and high (VIH) to select the Device Code word.

IL

current (ISB) is specified with VPP = VCC. VCC > VPP will cause a slight increase in ISB.

CC

V

Outputs

PP

(1)

D

OUT

(5)

High Z
D

PP

PP

PP

CC

IN

D

OUT

High Z

Identification Code

3

DC and AC Operating Conditions for Read Operation

AT27C4096

-55 -70 -90 -12 -15

Operating
Temperature (Case)

V

Power Supply 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%

CC

Com. 0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C

Ind. -40°C - 85°C-40°C - 85°C-40°C - 85°C-40°C - 85°C-40°C - 85°C

DC and Operating Characteristics for Read Operation

Symbol Parameter Condition Min Max Units

I

LI

I

LO

(2)

I

PP1

I

SB

I

CC

V

IL

V

IH

V

OL

V

OH

Notes: 1. VCC must be applied simultaneously or before VPP, and removed simultaneously or after VPP.

Input Load Current VIN = 0V to V
Output Leakage Current V

(1)

V

Read/Standby Current VPP = V

PP

(1)

V

Standby Current

CC

= 0V to V

OUT

I

(CMOS)

SB1

CE = V
I

(TTL)

SB2

CC

CC

± 0.3V

CE = 2.0 to V

VCC Active Current f = 5 MHz, I

CC

CC

+ 0.5V

CC

= 0 mA, CE = V

OUT

IL

± 1 µA
± 5 µA

10 µA

100 µA

1mA

40 mA
Input Low Voltage -0.6 0.8 V
Input High Voltage 2.0 VCC + 0.5 V
Output Low Voltage IOL = 2.1 mA 0.4 V
Output High Voltage I

= -400 µA2.4V

OH

2. VPP may be connected directly to VCC, except during programming. The supply current would then be the sum of ICC and IPP.

AC Characteristics for Read Operat ion

-55 -70 -90 -12 -15

Symbol Parameter Condition

t

t
t

t

t

ACC

CE

OE

DF

OH

(3)

(2)

(2)(3)

(4)(5)

(4)

Address to Output
Delay

CE to Output Delay OE = V
OE to Output Delay CE = V
OE or CE High to Output Float,

whichever occurred f irst
Output Hold from Address, CE or OE,

whichever occurred f irst

CE = OE

= V

IL

IL

IL

Note: 2, 3, 4, 5. See the AC Waveforms for Read Operation diagram.

4

AT27C4096

Min Max Min Max Min Max Min Max Min Max

55 70 90 120 150 ns

55 70 90 120 150 ns
20 30 35 40 50 ns

20 20 20 30 35 ns

77000ns

AT27C4096

Units