MICROCHIP 25AA040, 25LC040, 25C040 Technical data



25AA040/25LC040/25C040

4K SPI

™

Bus Serial EEPROM

DEVICE SELECTION TABLE

Part

Number

25AA040 1.8-5.5V 1 MHz C,I 25LC040 2.5-5.5V 2 MHz C,I

25C040 4.5-5.5V 3 MHz C,I,E

Range

Max Clock Frequency

Temp

Ranges

FEATURES

• Low power CMOS technology

- Write current: 3 mA typical

- Read current: 500 µ A typical

- Standby current: 500 nA typical

• 512 x 8 bit organization

• 16 byte page

• Write cycle time: 5ms max.

• Self-timed ERASE and WRITE cycles

• Block write protection

- Protect none, 1/4, 1/2, or all of array

• Built-in write protection

- Power on/off data protection circuitry

- Write enable latch

- Write protect pin

• Sequential read

• High reliability

- Endurance: 10M cycles (guaranteed)

- Data retention: > 200 years

- ESD protection: > 4000 V

• 8-pin PDIP, SOIC, and TSSOP packages

• Temperature ranges supported:

- Commercial: (C) 0 ° C to +70 ° C

- Industrial: (I) -40 ° C to +85 ° C

- Automotive: (E) (25C040) -40 ° C to +125 ° C

PACKAGE TYPES

PDIP/SOIC

CS SO

VSS

HOLD

VCC

CS SO

1 2 3 4

TSSOP

1 2 3 4

BLOCK DIAGRAM

Status

I/O Control

Logic

Memory

Control

25xx040

Logic

HOLD

SCK

HV Generator

EEPROM

Dec

Array

Page Latches

DESCRIPTION

The Microchip Technology Inc. 25AA040/25LC040/ 25C040 (25xx040 able PROM. The memory is accessed via a simple Serial Peripheral Interface (SPI) compatible serial bus. The bus signals required are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled through a chip select (CS

Communication to the device can be paused via the hold pin (HOLD tions on its inputs will be ignored, with the exception of chip select, allowing the host to service higher priority interrupts. Also, write operations to the device can be disabled via the write protect pin (WP

*25xx040 is used in this document as a generic part number for the 25AA040/25LC040/25C040 devices. SPI is a trademark of Motorola.

1997 Microchip Technology Inc.

) is a 4K bit serial Electrically Eras-

) input.

). While the device is paused, transi-

Preliminary

SO CS

SCK

HOLD

Y Decoder

Sense Amp. R/W Control

VCC VSS

DS21204A-page 1



≤

25AA040/25LC040/25C040

µ A µ

1.0 ELECTRICAL

1.1 Maxim

Vcc...................................................................................7.0V

All inputs and outputs w.r.t. Vss.................. -0.6V to Vcc+1.0V

Storage temperature.......................................-65˚C to 150˚C

Ambient temperature under bias..................... -65˚C to 125˚C

Soldering temperature of leads (10 seconds).............+300˚C

ESD protection on all pins.................................................4kV

*Notice: Stresses above those listed under ‘Maximum ratings’ may

cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this speciﬁcation is not implied. Exposure to maximum rating conditions for an extended period of time may affect device reliability

TABLE 1-1: PIN FUNCTION TABLE

CHARACTERISTICS

um Ratings*

Name Function

CS SO Serial Data Output

SI Serial Data Input

SCK Serial Clock Input

HOLD

Chip Select Input

Write Protect Pin Ground Supply Voltage Hold Input

FIGURE 1-1: AC TEST CIRCUIT

VCC

2.25 K

1.8 K

1.2 A

C Test Conditions

AC Waveform:

= 0.2V

= V

- 0.2V (Note 1)

= 4.0V (Note 2)

Timing Measurement Reference Level

Input 0.5 V Output 0.5 V

For V

> 4.0V

4.0V

Note 1: For V

100 pF

CC CC

TABLE 1-2: DC CHARACTERISTICS

All parameters apply over the speciﬁed operating ranges unless otherwise noted.

Commercial (C): T Industrial (I): T Automotive (E): T

Parameter Symbol Min Max Units Test Conditions

1 2.0 V

High level input voltage

Low level input voltage

Low level output voltage

High level output voltage V Input leakage current I Output leakage current I Internal Capacitance

IH IH

2 0.7 V

1 -0.3 0.8 V V

V V

2 -0.3 0.3 V

INT

(all inputs and outputs)

Read —

Operating Current

Standby Current I

Write —

CCS

Note: This parameter is periodically sampled and not 100% tested.

AMB

= 0 ° C to +70 ° C V

AMB

= -40 ° C to +85 ° C V

AMB

= -40 ° C to +125 ° C V

+1 V V

— 0.4 V I — 0.2 V I

-0.5 — V I

-10 10

-10 10 — 7 pF T

—

500

— —

—

3 5

= 1.8V to 5.5V

= 4.5V to 5.5V (25C040 only)

≥ 2.7V (Note)

CC CC

< 2.7V (Note)

≥ 2.7V (Note)

V V

A CS A CS

mAmAV

< 2.7V (Note)

= 2.1 mA = 1.0 mA, V

=-400 µ A

= V

= 25˚C, CLK = 1.0 MHz,

AMB

= 5.0V (Note)

= 5.5V; F

= 2.5V; F

CC CC

= 5.5V

= 2.5V

= Vcc = 5.5V, Inputs tied to V

, V , V

= V

OUT

CLK CLK

= V

CS = Vcc = 2.5V, Inputs tied to V

< 2.5V

=3.0 MHz; SO = Open =2.0 MHz; SO = Open

or V

SS SS

DS21204A-page 2

Preliminary

1997 Microchip Technology Inc.

25AA040/25LC040/25C040

TABLE 1-3: AC CHARACTERISTICS

All parameters apply over the speciﬁed operating ranges unless otherwise noted.

Parameter Symbol Min Max Units Test Conditions

Clock Frequency FCLK —

CS Setup Time TCSS 100

CS Hold Time TCSH 150

CS Disable Time TCSD 500 — ns Data Setup Time TSU 30

Data Hold Time THD 50

CLK Rise Time TR — 2 µs (Note 1) CLK Fall Time TF — 2 µs (Note 1) Clock High Time THI 150

Clock Low Time TLO 150

Clock Delay Time TCLD 50 — ns Clock Enable Time TCLE 50 — ns Output Valid from

Clock Low

Output Hold Time THO 0 — ns (Note 1) Output Disable Time TDIS —

HOLD Setup Time THS 100

HOLD Hold Time THH 100

HOLD Low to Output High-Z THZ 100

HOLD High to Output Valid THV 100

Internal Write Cycle Time TWC — 5 ms Endurance — 10M — E/W Cycles (Note 2)

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

2: This parameter is not tested but guaranteed by characterization. For endurance estimates in a speciﬁc application, please

consult the Total Endurance Model which can be obtained on Microchip’s BBS or website.

Commercial (C): Tamb = 0 ° C to +70 ° C V Industrial (I): Tamb = -40 ° C to +85 ° C V Automotive (E): Tamb = -40°C to +125°C VCC = 4.5V to 5.5V (25C040 only)

3 — —

250 500

250 475

50 50

100 100

250 475

TV —

— —

100 200

150 200

— — —

150 250 475

200 250 500

— — —

= 1.8V to 5.5V

CC = 1.8V to 5.5V

MHz MHz MHz

ns ns ns

VCC = 4.5V to 5.5V VCC = 2.5V to 4.5V VCC = 1.8V to 2.5V

VCC = 4.5V to 5.5V VCC = 2.5V to 4.5V

CC = 1.8V to 2.5V

VCC = 4.5V to 5.5V VCC = 2.5V to 4.5V VCC = 1.8V to 2.5V

VCC = 4.5V to 5.5V (Note 1) VCC = 2.5V to 4.5V (Note 1) VCC = 1.8V to 2.5V (Note 1)

VCC = 4.5V to 5.5V VCC = 2.5V to 4.5V VCC = 1.8V to 2.5V

VCC = 4.5V to 5.5V (Note 1) VCC = 2.5V to 4.5V (Note 1) VCC = 1.8V to 2.5V (Note 1)

VCC = 4.5V to 5.5V VCC = 2.5V to 4.5V VCC = 1.8V to 2.5V



1997 Microchip Technology Inc.

Preliminary

DS21204A-page 3

25AA040/25LC040/25C040

FIGURE 1-2: HOLD TIMING

THH

THS THS THH

SCK

n+2 n+1 n n-1

n+2 n+1 n

HOLD

FIGURE 1-3: SERIAL INPUT TIMING

high impedance

don’t care

THVTHZ

TSU

n-1

TCSS

THDTsu

MSB in

high impedance

SCK

Mode 1,1 Mode 0,0

FIGURE 1-4: SERIAL OUTPUT TIMING

THI

SCK

TLO

THC

TCSD

TCLE

TCLD

TCSH

LSB in

TCSH

Mode 1,1 Mode 0,0

TDIS

DS21204A-page 4 Preliminary  1997 Microchip Technology Inc.

MSB out

don’t care

ISB out

+ 9 hidden pages

MICROCHIP 25AA040, 25LC040, 25C040 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

BLOCK DIAGRAM

1.0 ELECTRICAL