93C66.PDF

AT93C46/56/57/66

Features

Low Voltage and Standard Voltage Operation

5.0 (V CC = 4.5V to 5.5V)

2.7 (V CC = 2.7V to 5.5V)

2.5 (V CC = 2.5V to 5.5V)

1.8 (V CC = 1.8V to 5.5V)

User Selectable Internal Organization

1K: 128 x 8 or 64 x 16

2K: 256 x 8 or 128 x 16

4K: 512 x 8 or 256 x 16

3-Wire

Serial CMOS

E 2 PROMs

3-Wire Serial Interface

2 MHz Clock Rate (5V) Compatibility

Self-Timed Write Cycle (10 ms max)

High Reliability

Endurance: 1 Million Cycles

Data Retention: 100 Years

Automotive Grade and Extended Temperature Devices Available

1K (128 x 8 or 64 x 16)

8-Pin PDIP, JEDEC SOIC, and EIAJ SOIC Packages

Description

The AT93C46/56/57/66 provides 1024/2048/4096 bits of serial electrically erasable

programmable read only memory (EEPROM) organized as 64/128/256 words of 16

bits each, when the ORG Pin is connected to V CC and 128/256/512 words of 8 bits

each when it is tied to ground. The device is optimized for use in many industrial and

commercial applications where low power and low voltage operation are essential.

The AT93C46/56/57/66 is available in space saving 8-pin PDIP and 8-pin JEDEC and

EIAJ SOIC packages.

2K (256 x 8 or 128 x 16)

4K (512 x 8 or 256 x 16)

(continued)

Pin Configurations

Pin Name

Function

8-Pin PDIP

Chip Select

Serial Data Clock

Serial Data Input

Serial Data Output

GND

Ground

AT93C46/56/57/66

V CC

Power Supply

ORG

Internal Organization

Don’t Connect

8-Pin SOIC

Rotated (R)

(1K JEDEC Only)

0172J

2-63

Description (Continued)

The AT93C46/56/57/66 is enabled through the Chip Se-

lect pin (CS), and accessed via a 3-wire serial interface

consisting of Data Input (DI), Data Output (DO), and Shift

Clock (SK). Upon receiving a READ instruction at DI, the

address is decoded and the data is clocked out serially on

the data output pin DO. The WRITE cycle is completely

self-timed and no separate ERASE cycle is required be-

fore WRITE. The WRITE cycle is only enabled when the

part is in the ERASE/WRITE ENABLE state. When CS is

brought “high” following the initiation of a WRITE cycle, the

DO pin outputs the READY/BUSY status of the part.

The AT93C46/56/57/66 is available in 4.5V to 5.5V, 2.7V

to 5.5V, 2.5V to 5.5V, and 1.8V to 5.5V versions.

Absolute Maximum Ratings*

Operating Temperature................... -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 conditions beyond those indi-

cated in the operational sections 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 ..................... -1.0V to +7.0V

Maximum Operating Voltage ........................... 6.25V

DC Output Current ......................................... 5.0 mA

Block Diagram (1)

Note: 1. When the ORG pin is connected to V CC , the x 16 organization is selected. When it is connected to ground, the x 8 organiza-

tion is selected. If the ORG pin is left unconnected, then an internal pullup device (of approximately 1 M W ) will select the x

16 organization. This feature is not available on 1.8V devices.

2-64

AT93C46/56/57/66

AT93C46/56/57/66

Pin Capacitance (1)

Applicable over recommended operating range from T A = 25°C, f = 1.0 MHz, V CC = +5.0V (unless otherwise noted).

Test Conditions

Max

Units

Conditions

C OUT

Output Capacitance (DO)

V OUT = 0V

C IN

Input Capacitance (CS, SK, DI)

V IN = 0V

Note: 1. This parameter is characterized and is not 100% tested.

DC Characteristics

Applicable over recommended operating range from: T AI = -40°C to +85°C, V CC = +1.8V to +5.5V,

T AC = 0°C to +70°C, V CC = +1.8V to +5.5V (unless otherwise noted).

Symbol Parameter

Test Condition

Min

Typ

Max

Unit

V CC1

Supply Voltage

1.8

5.5

V CC2

Supply Voltage

2.5

5.5

V CC3

Supply Voltage

2.7

5.5

V CC4

Supply Voltage

4.5

5.5

READ at

1.0 MHz

0.5

2.0

I CC

Supply Current

V CC = 5.0V

WRITE at

1.0 MHz

0.5

2.0

I SB1

Standby Current

V CC = 1.8V

CS = 0V

0.1

I SB2

Standby Current

V CC = 2.5V

CS = 0V

6.0

10.0

I SB3

Standby Current

V CC = 2.7V

CS = 0V

6.0

10.0

I SB4

Standby Current

V CC = 5.0V

CS = 0V

I IL

Input Leakage

V IN = 0V to V CC

0.1

1.0

I OL

Output Leakage

V IN = 0V to V CC

0.1

1.0

V IL1 (1)

V IH1 (1)

Input Low Voltage

Input High Voltage

4.5V

V CC

5.5V

-0.1

2.0

0.8

V CC + 1

V IL2 (1)

V IH2 (1)

Input Low Voltage

Input High Voltage

1.8V

V CC

2.7V

0.0

V CC x 0 .7

V CC x 0.3

V CC + 1

V OL1

V OH1

Output Low Voltage

Output High Voltage

4.5V

V CC

5.5V

I OL = 2.1 mA

0.4

I OH = -0.4 mA

2.4

V OL2

V OH2

Output Low Voltage

Output High Voltage

1.8V

V CC

2.7V

I OL = 0.15 mA

0.2

I OH = -100

A CC - 0.2

Note: 1. V IL min and V IH max are reference only and are not tested.

2-65

AC Characteristics

Applicable over recommended operating range from T A = -40°C to + 85°C, V CC = As Specified,

CL = 1 TTL Gate and 100 pF (unless otherwise noted).

Symbol

Parameter

Test Condition

Min

Typ

Max

Units

4.5V

V CC

5.5V

0.5

0.25

SK Clock

Frequency

2.7V

V CC

5.5V

f SK

MHz

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

250

500

1000

2.7V

V CC

5.5V

t SKH

SK High Time

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

250

500

1000

2.7V

V CC

5.5V

t SKL

SK Low Time

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

250

500

1000

Minimum CS Low

Time

2.7V

V CC

5.5V

t CS

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

100

200

2.7V

V CC

5.5V

t CSS

CS Setup Time

Relative to SK

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

100

200

400

2.7V

V CC

5.5V

t DIS

DI Setup Time

Relative to SK

2.5V

V CC

5.5V

1.8V

V CC

5.5V

t CSH

CS Hold Time

Relative to SK

4.5V

V CC

5.5V

100

200

400

2.7V

V CC

5.5V

t DIH

DI Hold Time

Relative to SK

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

250

500

1000

2.7V

V CC

5.5V

t PD1

Output Delay to ‘1’ AC Test

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

250

500

1000

2.7V

V CC

5.5V

t PD0

Output Delay to ‘0’ AC Test

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

250

500

1000

2.7V

V CC

5.5V

t SV

CS to Status Valid AC Test

2.5V

V CC

5.5V

1.8V

V CC

5.5V

4.5V

V CC

5.5V

100

200

400

CS to DO in High

Impedance

AC Test

CS = V IL

2.7V

V CC

5.5V

t DF

2.5V

V CC

5.5V

1.8V

V CC

5.5V

t WP

Write Cycle Time

0.1

4.5V

V CC

5.5V

2-66

AT93C46/56/57/66

AT93C46/56/57/66

Instruction Set for the AT93C46

Code

Address

Data

Instruction SB

x 8

x 16

x 8

x 16

Comments

READ

A 6 - A 0

A 5 - A 0

Reads data stored in memory, at

specified address.

EWEN

11XXXXX

11XXXX

Write enable must precede all

programming modes.

ERASE

A 6 - A 0

A 5 - A 0

Erase memory location A n - A 0 .

WRITE

A 6 - A 0

A 5 - A 0

D 7 - D 0 D 15 - D 0 Writes memory location A n - A 0 .

ERAL

10XXXXX

10XXXX

Erases all memory locations. Valid

only at V CC = 4.5V to 5.5V.

WRAL

01XXXXX

01XXXX D 7 - D 0 D 15 - D 0

Writes all memory locations. Valid

only at V CC = 4.5V to 5.5V.

EWDS

00XXXXX

00XXXX

Disables all programming

instructions.

Instruction Set for the AT93C57

Code

Address

Data

Instruction SB

x 8

x 16

x 8

x 16

Comments

READ

A 7 - A 0

A 6 - A 0

Reads data stored in memory, at

specified address.

EWEN

11XXXXXX 11XXXXX

Write enable must precede all

programming modes.

ERASE

A 7 - A 0

A 6 - A 0

Erase memory location A n - A 0 .

WRITE

A 7 - A 0

A 6 - A 0

D 7 - D 0 D 15 - D 0 Writes memory location A n - A 0 .

ERAL

10XXXXXX 10XXXXX

Erases all memory locations. Valid

only at V CC = 4.5V to 5.5V.

WRAL

01XXXXXX 01XXXXX D 7 - D 0 D 15 - D 0

Writes all memory locations. Valid

only at V CC = 4.5V to 5.5V.

EWDS

00XXXXXX 00XXXXX

Disables all programming

instructions.

2-67

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