Fairchild Semiconductor NM24W02EM8, NM24W02LMT8, NM24W02M8, NM24W02UMT8, NM24W02ULMT8 Datasheet

1

www.fairchildsemi.com

NM24Wxx Rev. C.2

NM24Wxx 2K/4K/8K/16K-Bit Standard 2-Wire Bus Interface

Serial EEPROM with Full Array Write Protect

PRELIMINARY

March 1999

© 1999 Fairchild Semiconductor Corporation

NM24Wxx
2K/4K/8K/16K-Bit Standard 2-Wire Bus Interface
Serial EEPROM with Full Array Write Protect

General Description

The NM24Wxx devices are 2048/4096/8192/16,384 bits, respec­tively, of CMOS non-volatile electrically erasable memory. These
devices conform to all specifications in the IIC 2-wire protocol and
are designed to minimize device pin count, and simplify PC board
layout requirements.

The entire ememory can be disabled (Write Protected) by con­necting the WP pin to VCC. The memory then becomes unalterable
unless WP is switched to VSS.

This communications protocol uses CLOCK (SCL) and DATA
I/O (SDA) lines to synchronously clock data between the master
(for example a microprocessor) and the slave EEPROM device(s).
The Standard IIC protocol allows for a maximum of 16K of
EEPROM memory which is supported by Fairchild's family in 2K,
4K, 8K, and 16K devices, allowing the user to configure the
memory as the application requires with any combination of
EEPROMs.

Fairchild EEPROMs are designed and tested for applications
requiring high endurance, high reliability and low power consump­tion.

Block Diagram

DS500074-1

H.V. GENERATION

TIMING &CONTROL

E2PROM

ARRAY

16

YDEC

8

DATA REGISTER

XDEC

CONTROL

LOGIC

WORD
ADDRESS
COUNTER

SLAVE ADDRESS

REGISTER &

COMPARATOR

START

STOP

LOGIC

START CYCLE

16/
32/
64/

128/

4

4

CK

D

IN

R/W

LOAD INC

SDA

V

SS

V

CC

WP

D

OUT

A2
A1
A0

Device Address Bits

0/1/2/3

SCL

Features

■ Hardware Write Protect for entire memory

■ Low Power CMOS

200µA active current typical
10µA standby current typical
1µA standby typical (L)

0.1µA standby typical (LZ)

■ IIC Compatible interface
— Provides bidirectional data transfer protocol

■ Sixteen byte page write mode
— Minimizes total write time per byte

■ Self timed write cycle
— Typical write cycle time of 6ms

■ Endurance: 1,000,000 data changes

■ Data retention greater than 40 years

■ Packages available: 8-pin DIP, 8-pin SO, and 8-pin TSSOP

■ Available in three temperature ranges

- Commercial: 0° to +70°C

- Extended (E): -40° to +85C

- Automotive (V): -40° to +125°C

2

www.fairchildsemi.com

NM24Wxx Rev. C.2

NM24Wxx 2K/4K/8K/16K-Bit Standard 2-Wire Bus Interface

Serial EEPROM with Full Array Write Protect

Connection Diagrams

Dual-In-Line Package (N), SO Package (M8), and TSSOP Package (MT8)

Top View

See Package Number N08E (N), M08A (M8), and MTC08 (MT8)

Pin Names

A0,A1,A2 Device Address Inputs

V

SS

Ground
SDA Data I/O
SCL Clock Input

WP Write Protect
V

CC

Power Supply

NC No Connect

Ordering Information
NM 24 W XX LZ E XX Letter Description

Package N 8-Pin DIP

M8 8-Pin SO8
MT8 8-Pin TSSOP

Temp. Range None 0 to 70°C

E -40 to +85°C
V -40°C to +125°C

Voltage Operating Range Blank 4.5V to 5.5V

L 2.7V to 4.5V
LZ 2.7V to 4.5V and

<1µA Standby Current

Density 02 2K

04 4K
08 8K
16 16K

W Total Array Write Protect

Interface 24 IIC

NM Fairchild Non-Volatile

Memory

A0
A1
A2

V

SS

V

CC

WP
SCL
SDA

8
7
6
5

1
2
3
4

DS500074-3

NM24W02

NC

A1
A2

V

SS

V

CC

WP
SCL
SDA

8
7
6
5

1
2
3
4

NC
NC

A2

V

SS

V

CC

WP
SCL
SDA

8
7
6
5

1
2
3
4

NC
NC
NC

V

SS

V

CC

WP
SCL
SDA

8
7
6
5

1
2
3
4

NM24W04 NM24W08 NM24W16

DS500074-4 DS500074-18DS500074-2

3

www.fairchildsemi.com

NM24Wxx Rev. C.2

NM24Wxx 2K/4K/8K/16K-Bit Standard 2-Wire Bus Interface

Serial EEPROM with Full Array Write Protect

Product Specifications
Absolute Maximum Ratings

Ambient Storage Temperature –65°C to +150°C
All Input or Output Voltages

with Respect to Ground 6.5V to –0.3V

Lead Temperature

(Soldering, 10 seconds) +300°C

ESD Rating 2000V min.

Operating Conditions

Ambient Operating Temperature

NM24Wxx 0°C to +70°C
NM24WxxE -40°C to +85°C
NM24WxxV -40°C to +125°C

Positive Power Supply

NM24Wxx 4.5V to 5.5V
NM24WxxL 2.7V to 4.5V
NM24WxxLZ 2.7V to 4.5V

Standard VCC (4.5V to 5.5V) DC Electrical Characteristics

Symbol Parameter Test Conditions Limits Units

Min Typ Max

(Note 1)

I

CCA

Active Power Supply Current f

SCL

= 100 kHz 0.2 1.0 mA

I

SB

Standby Current VIN = GND or V

CC

10 50 µA

I

LI

Input Leakage Current VIN = GND to V

CC

0.1 1 µA

I

LO

Output Leakage Current V

OUT

= GND to V

CC

0.1 1 µA

V

IL

Input Low Voltage –0.3 VCC x 0.3 V

V

IH

Input High Voltage VCC x 0.7 VCC + 0.5 V

V

OL

Output Low Voltage I

OL

= 3 mA 0.4 V

Low VCC (2.7V to 5.5V) DC Electrical Characteristics

Symbol Parameter Test Conditions Limits Units

Min Typ Max

(Note 1)

I

CCA

Active Power Supply Current f

SCL

= 100 kHz 0.2 1.0 mA

I

SB

Standby Current for L VIN = GND or V

CC

110µA

Standby Current for LZ VIN = GND or V

CC

0.1 1 µA

I

LI

Input Leakage Current VIN = GND to V

CC

0.1 1 µA

I

LO

Output Leakage Current V

OUT

= GND to V

CC

0.1 1 µA

V

IL

Input Low Voltage –0.3 V

CC

x 0.3 V

V

IH

Input High Voltage VCC x 0.7 VCC + 0.5 V

V

OL

Output Low Voltage IOL = 3 mA 0.4 V

Capacitance T

A

= +25°C, f = 100/400 KHz, VCC = 5V (Note 2)

Symbol Test Conditions Max Units

C

I/O

Input/Output Capacitance (SDA) V

I/O

= 0V 8 pF

C

IN

Input Capacitance (A0, A1, A2, SCL) VIN = 0V 6 pF

Note 1: Typical values are TA = 25°C and nominal supply voltage (5V).
Note 2: This parameter is periodically sampled and not 100% tested.

4

www.fairchildsemi.com

NM24Wxx Rev. C.2

NM24Wxx 2K/4K/8K/16K-Bit Standard 2-Wire Bus Interface

Serial EEPROM with Full Array Write Protect

AC Conditions of Test

Input Pulse Levels VCC x 0.1 to VCC x 0.9
Input Rise and Fall Times 10 ns
Input & Output Timing Levels VCC x 0.5
Output Load 1 TTL Gate and CL = 100 pF

Read and Write Cycle Limits (Standard and Low VCC Range 2.7V - 4.5V)

Symbol Parameter 100 KHz 400 KHz Units

Min Max Min Max

f

SCL

SCL Clock Frequency 100 400 KHz

T

I

Noise Suppression Time Constant at
SCL, SDA Inputs (Minimum V

IN

100 50 ns

Pulse width)

t

AA

SCL Low to SDA Data Out Valid 0.3 3.5 0.1 0.9 µs

t

BUF

Time the Bus Must Be Free before 4.7 1.3 µs
a New Transmission Can Start

t

HD:STA

Start Condition Hold Time 4.0 0.6 µs

t

LOW

Clock Low Period 4.7 1.5 µs

t

HIGH

Clock High Period 4.0 0.6 µs

t

SU:STA

Start Condition Setup Time 4.7 0.6 µs
(for a Repeated Start Condition)

t

HD:DAT

Data in Hold Time 0 0 ns

t

SU:DAT

Data in Setup Time 250 100 ns

t

R

SDA and SCL Rise Time 1 0.3 µs

t

F

SDA and SCL Fall Time 300 300 ns

t

SU:STO

Stop Condition Setup Time 4.7 0.6 µs

t

DH

Data Out Hold Time 300 50 ns

t

WR

Write Cycle Time - NM24Wxx 10 10 ms

(Note 3) - NM24WxxL, NM24WxxLZ 15 15

Note 3: The write cycle time (tWR) is the time from a valid stop condition of a write sequence to the end of the internal erase/program cycle. During the write cycle, the
NM24Wxx bus interface circuits are disabled, SDA is allowed to remain high per the bus-level pull-up resistor, and the device does not respond to its slave address.

5

www.fairchildsemi.com

NM24Wxx Rev. C.2

NM24Wxx 2K/4K/8K/16K-Bit Standard 2-Wire Bus Interface

Serial EEPROM with Full Array Write Protect

Bus Timing

Background Information (IIC Bus)

As mentioned, the IIC bus allows synchronous bidirectional com­munication between Transmitter/Receiver using the SCL (clock)
and SDA (Data I/O) lines. All communication must be started with
a valid START condition, concluded with a STOP condition and
acknowledged by the Receiver with an ACKNOWLEDGE condi­tion.

In addition, since the IIC bus is designed to support other devices
such as RAM, EPROMs, etc., a devce type identifier string must
follow the START condition. For EEPROMs, this 4-bit string is
1010 and is the first 4 bits in the slave address.

As shown below, the EEPROMs on the IIC bus may be configured
in any manner required, and for the Standard IIC protocol, the total
memory addressed can not exceed 16K (16,384 bits). EEPROM
memory address programming is controlled by 2 methods:

• Hardware configuring the A0, A1, and A2 pins (Device
Address pins) with pull-up or pull-down to resistors. All
unused pins must be grounded (tied to VSS).

• Software addressing the required PAGE BLOCK within the
device memory array (as sent in the Slave Address string).

Addressing an EEPROM memory location involves sending a
command string with the following information:

[DEVICE TYPE]—[DEVICE ADDRESS]—[PAGE BLOCK
ADDRESS]—[BYTE ADDRESS]

DEFINITIONS

WORD 8 bits of data
PAGE 16 sequential addresses (one byte

each) that may be programmed
during a 'Page Write' programming
cycle

PAGE BLOCK 2,048 (2K) bits organized into 16

pages of addressable memory. (8
bits) x (16 bytes) x (16 pages) = 2,048
bits

MASTER Any IIC device CONTROLLING the

transfer of data (such as a micropro­cessor)

SLAVE Device being controlled (EEPROMs

are always considered Slaves)

TRANSMITTER Device currently SENDING data on

the bus (may be either a Master or
Slave).

RECEIVER Device currently receiving data on the

bus (Master or Slave)

Example of 16K of Memory on 2-Wire Bus

Note: The SDA pull-up resistor is required due to the open-drain/open collector output of IIC bus devices.

The SCL pull-up resistor is recommended because of the normal SCL line inactive 'high' state.
It is recommended that the total line capacitance be less than 400pF.
Specific timing and addressing considerations are described in greater detail in the following sections.

DS500074-5

DS500074-6

SDA

SCL

NM24W02

V

CC

V

CC

A0 A1 A2 V

SS

NM24W02

A0 A1 A2 V

SS

NM24W04

A0 A1 A2 V

SS

NM24W08

A0 A1 A2 V

SS

V

CC

To V

CC

or V

SS

To V

CC

or V

SS

To V

CC

or V

SS

To V

CC

or V

SS

V

CC

V

CC

V

CC

SCL

SDA

IN

SDA
OUT

t

F

t

LOW

t

HIGH

t

R

t

LOW

t

AA

t

DH

t

BUF

t

SU:STA

t

HD:DAT

t

HD:STA

t

SU:DAT

t

SU:STO