PDIP Top View

VPP

O15

O14

O13

O12

O11

O10

GND

VCC

PGM

A15

A14

A13

A12

A11

A10

GND

VSOP Top View

Type 1

A10

A11

A12

A13

A14

A15

PGM

VCC

VPP

O15

O14

O13

O12

O11

O10

GND

Features

�

Fast Read Access Time - 45 ns

�

Low-Power CMOS Operation

� 100 �A max. Standby
� 30 mA max. 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 (AT27C516) EPROM

�

�
�
�
�

10% Power Supply

�

High-Reliability CMOS Technology

� 2000V ESD Protection
� 200 mA Latchup Immunity

�

RapidTM

Programming Algorithm - 100 �s/word (typical)

�

CMOS and TTL Compatible Inputs and Outputs

�

Integrated Product Identification Code

�

Commercial, Industrial and Automotive Temperature Ranges

Description

The AT27C1024 is a low-power, high-performance 1,048,576 bit one-time program-
mable read only memory (OTP EPROM) organized 64K by 16 bits. It requires only
one 5V power supply in normal read mode operation. Any word can be accessed in
less than 45 ns, eliminating the need for speed reducing WAIT states. The by-16 orga-

Rev. 0019J�07/98

AT27C1024

1-Megabit
(64K x 16)
OTP EPROM

AT27C1024

Note:

Both GND pins must be connected.

Pin Configurations

Pin Name

Function

A0 - A15

Addresses

O0 - O15

Outputs

Chip Enable

Output Enable

PGM

Program Strobe

No Connect

(continued)

PLCC Top View

O12

O11

O10

GND

A13

A12

A11

A10

GND

O13

O14

O15

VPP

VCC

PGM

A15

A14

AT27C1024

nization make this part ideal for high-performance 16- and
32-bit microprocessor systems.

In read mode, the AT27C1024 typically consumes 15 mA.
Standby mode supply current is typically less than 10 �A.

The AT27C1024 is available in industry standard JEDEC-
approved one-time programmable (OTP) plastic PDIP,
PLCC, and VSOP packages. The device features two-line
control (CE, OE) to eliminate bus contention in high-speed
systems.

With high density 64K word storage capability, the
AT27C1024 allows firmware to be stored reliably and to be
accessed by the system without the delays of mass storage
media.

Atmel's 27C1024 have additional features to ensure high
quality and efficient production use. The Rapid

Program-

ming Algorithm reduces the time required to program the
part and guarantees reliable programming. Programming
time is typically only 100 �s/word. The Integrated Product
Identification Code electronically identifies the device 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 produce transient voltage excursions.
Unless accommodated by the system design, these tran-
sients may exceed data sheet limits, resulting in device
non-conformance. At a minimum, a 0.1 �F high frequency,
low inherent inductance, ceramic capacitor should be uti-
lized for each device. This capacitor should be connected
between the V

and Ground terminals of the device, as

close to the device as possible. Additionally, to stabilize the
supply voltage level on printed circuit boards with large
EPROM arrays, a 4.7 �F bulk electrolytic capacitor should
be utilized, again connected between the V

and Ground

terminals. This capacitor should be positioned as close as
possible to the point where the power supply is connected
to the array.

Block Diagram

AT27C1024

Note:

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

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

Notes:

1. X can be V

or V

2. Refer to Programming Characteristics.

3. V

= 12.0 � 0.5V.

4. Two identifier words may be selected. All Ai inputs are held low (V

), except A9 which is set to V

and A0 which is toggled

low (V

) to select the Manufacturer's Identification word and high (V

) to select the Device Code word.

5. Standby V

current (I

) is specified with V

= V

. V

> V

will cause a slight increase in I

Absolute Maximum Ratings*

Temperature Under Bias ............................... -55

�

C to + 125

�

*NOTICE:

Stresses beyond those listed under "Absolute Maxi-
mum 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 condi-
tions beyond those indicated in the operational sec-
tions of this specification is not implied. Exposure to
absolute maximum rating conditions for extended
periods may affect device reliability.

Storage Temperature .................................... -65

�

C to + 150

�

Voltage on Any Pin with
Respect to Ground ........................................-2.0V to + 7.0V

(1)

Voltage on A9 with
Respect to Ground .....................................-2.0V to + 14.0V

(1)

Supply Voltage with

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

(1)

Operating Modes

Mode/Pin

PGM

Outputs

Read

(1)

OUT

Output Disable

High Z

Standby

(5)

High Z

Rapid Program

(2)

PGM Verify

OUT

PGM Inhibit

High Z

Product Identification

(4)

A9 = V

(3)

A0 = V

or V

A1 - A15 = V

Identification Code

AT27C1024

Notes:

1. V

must be applied simultaneously or before V

, and removed simultaneously or after V

2. V

may be connected directly to V

, except during programming. The supply current would then be the sum of I

and I

Note:

2, 3, 4, 5. - see AC Waveforms for Read Operation.

DC and AC Operating Conditions for Read Operation

AT27C1024

-45

-55

-70

-90

-12

-15

Operating
Temp. (Case)

Com.

�

C - 70

�

C - 70

�

C - 70

�

C - 70

�

C - 70

�

C - 70

�

Ind.

-40

�

C - 85

�

-40

�

C - 85

�

-40

�

C - 85

�

-40

�

C - 85

�

-40

�

C - 85

�

-40

�

C - 85

�

Auto.

-40

�

C - 125

�

-40

�

C - 125

�

-40

�

C - 125

�

Power Supply

�

10%

�

10%

�

10%

�

10%

�

10%

�

10%

DC and Operating Characteristics for Read Operation

Symbol

Parameter

Condition

Min

Max

Units

Input Load Current

= 0V to V

Com., Ind.

�

�A

Auto.

�

�A

Output Leakage Current

OUT

= 0V to V

Com., Ind.

�

�A

Auto.

�

�A

PP1

(2)

(1))

Read/Standby Current

= V

�A

(1)

Standby Current

SB1

(CMOS), CE = V

�

0.3V

100

�A

SB2

(TTL), CE = 2.0 to V

+ 0.5V

Active Current

f = 5 MHz, I

OUT

= 0 mA, CE = V

Input Low Voltage

-0.6

0.8

Input High Voltage

2.0

+ 0.5

Output Low Voltage

= 2.1 mA

0.4

Output High Voltage

= -400

�

2.4

AC Characteristics for Read Operation

Symbol

Parameter

Condition

AT27C1024

Units

-45

-55

-70

-90

-12

-15

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

ACC

(3)

Address to Output Delay

CE = OE = V

120

150

(2)

CE to Output Delay

OE = V

120

150

(2)(3)

OE to Output Delay

CE = V

(4)(5)

OE or CE High to Output Float, whichever
occurred first

Output Hold from Address, CE or OE,
whichever occurred first

AT27C1024

AC Waveforms for Read Operation

(1)

Notes:

Timing measurement reference level is 1.5V for -45 and -55 devices. Input AC drive levels are V

= 0.0V and V

= 3.0V.

Timing measurement reference levels for all other speed grades are V

= 0.8V and V

= 2.0V. Input AC drive levels are

= 0.45V and V

= 2.4V.

OE may be delayed up to t

- t

after the falling edge of CE without impact on t

OE may be delayed up to t

ACC

- t

after the address is valid without impact on t

ACC

This parameter is only sampled and is not 100% tested.

Output float is defined as the point when data is no longer driven.

Note:

1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.

Pin Capacitance

f = 1 MHz, T = 25�C

(1)

Symbol

Typ

Max

Units

Conditions

= 0V

OUT

= 0V

Input Test Waveforms and Measurement Levels

For -45 and -55
Devices Only

For -70 and slower
Devices Only

Output Test Load

Note:

= 100 pF including jig

capacitance except -45 and -55
devices, where C

= 30 pF.

Электронный компонент: AT27C1024-12