[PDF] AT25320B and AT25640B - Microchip Technology

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AT25320B and AT25640B - Microchip Technology

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Serial Peripheral Interface (SPI) Compatible

Supports SPI Modes 0 (0,0) and 3 (1,1)

ࡳDatasheet Describes Mode 0 Operation

Low-voltage and standard-voltage Operation

ࡳ1.8V (V CC = 1.8V to 5.5V)

20MHz Clock Rate (5V)32-byte Page Mode

Block Write Protection

ࡳProtect 1/4, 1/2, or Entire Array Write Protect (WP) Pin and Write Disable Instructions for Both Hardware and

Software Data Protection

Self-timed Write Cycle (5ms Max)

High Reliability

ࡳEndurance: 1,000,000 Write Cycles ࡳData Retention: 100 YearsGreen (Pb/Halide-free/RoHS Compliant) Packaging Options Die Sales: Wafer Form, Tape and Reel, and Bumped Wafers

Description

The Atmel

AT25320B/640B provides 32,768-/65,536-bits of Serial Electrically-Erasable Programmable Read-Only Memory (EEPROM) organized as

4,096/8,192 words of 8 bits each. The device is optimized for use in many

industrial and commercial applications where low-power and low-voltage operation are essential. The AT25320B/640B is available in space-saving 8-lead JEDEC SOIC, 8-lead TSSOP, 8-lead UDFN, 8-lead XDFN, and 8-ball VFBGA packages. The AT25320B/640B is enabled through the Chip Select pin (CS) and accessed via a 3-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK). All programming cycles are completely self-timed, and no separate erase cycle is required before Write. Block Write Protection is enabled by programming the status register with one of four blocks of write protection. Separate Program Enable and Program Disable instructions are provided for additional data protection. Hardware data protection is provided via the WP pin to protect against inadvertent write attempts to the status register. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence.

AT25320B and AT25640B

SPI Serial EEPROM

32Kb (4096 x 8) and 64Kb (8192 x 8)

DATASHEET

AT25320B/640B [DATASHEET]

2

1. Pin Configurations and Pinouts

Table 1-1. Pin Configurations

2. Absolute Maximum Ratings*

Pin NameFunction

CSChip Select

SCKSerial Data Clock

SISerial Data Input

SOSerial Data Output

GNDGround

V CC

Power Supply

WPWrite Protect

HOLDSuspends Serial Input

Note: Drawings are not to scale.

CS SO WP GND1 2 3 48
7 6 5

8-lead SOIC

V CC HOLD SCK SI

8-lead TSSOP

Top View Top View

1 2 3 48
7 6 5CS SO WP GNDV CC HOLD SCK SI 1 2 3 48
7 6 5

8-ball VFBGA

Bottom View8-pad UDFN

Bottom View

1 2 3 48
7 6 5V CC HOLD SCK SI CS SO WP GND

8-pad XDFN

Bottom View

1 2 3 48
7 6 5V CC HOLD SCK SI CS SO WP GND V CC HOLD SCK SI CS SO WP GND Operating Temperature . . . . . . . . . . . . . . . -55C to +125C Storage Temperature. . . . . . . . . . . . . . . . . -65C to +150C

Voltage on Any Pin

with Respect to Ground . . . . . . . . . . . . . . . . .-1.0V to +7.0V Maximum Operating Voltage . . . . . . . . . . . . . . . . . . . 6.25V

DC Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0mA*Notice: Stresses beyond those listed under "Absolute

Maximum 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 indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

3AT25320B/640B [DATASHEET]

3. Block Diagram

Figure 3-1. Block Diagram

V CCGND SI SCK

SOStatus

RegisterMemory Array

4,096/8,192 x 8Address

Decoder

Data

Register

Output

Buffer

Mode

Decode

Logic Clock

Generator

HOLD CS WP

AT25320B/640B [DATASHEET]

4

4. Electrical Characteristics

4.1 Pin Capacitance

Table 4-1. Pin Capacitance

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

4.2 DC Characteristics

Table 4-2. DC Characteristics

Notes: 1. V

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

2. Worst case measured at 85

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

SymbolTest ConditionsMaxUnitsConditions

C OUT

Output Capacitance (SO)8pFV

OUT = 0V C IN

Input Capacitance (CS, SCK, SI, WP, HOLD)6pFV

IN = 0V Applicable over recommended operating range from: T AI = -40C to +85C, V CC = 1.8V to 5.5V (unless otherwise noted).

Symbol ParameterTest Condition MinTypMaxUnits

V CC1

Supply Voltage1.85.5V

V CC2

Supply Voltage2.55.5V

V CC3

Supply Voltage4.55.5V

I CC1

Supply CurrentV

CC = 5.0V at 20MHz, SO = Open, Read7.510.0mA I CC2

Supply CurrentV

CC = 5.0V at 20MHz, SO = Open, Read, Write4.010.0mA I CC3

Supply CurrentV

CC = 5.0V at 5MHz, SO = Open, Read, Write4.06.0mA I SB1

Standby CurrentV

CC = 1.8V, CS = V CC < 0.16.0 (2) A I SB2

Standby Current V

CC = 2.5V, CS = V CC

0.37.0

(2) A I SB3

Standby CurrentV

CC = 5.0V, CS = V CC

2.010.0

(2) A I IL

Input LeakageV

IN = 0V to V CC -3.03.0A I OL

Output LeakageV

IN = 0V to V CC , T AC = 0°C to 70°C-3.03.0A V IL(1)

Input Low-voltage-0.6V

CC x 0.3 V V IH(1)

Input High-voltageV

CC x 0.7V CC + 0.5V V OL1

Output Low-voltage

3.6V V

CC 5.5V I OL = 3.0mA0.4V V OH1

Output High-voltageI

OH = -1.6mAV CC - 0.8 V V OL2

Output Low-voltage

1.8V V

CC 3.6V I OL = 0.15mA0.2V V OH2

Output High-voltageI

OH = 100AV CC - 0.2 V

5AT25320B/640B [DATASHEET]

4.3 AC Characteristics

Table 4-3. AC Characteristics

Applicable over recommended operating range from T AI = -40°C to +85°C, V CC = As Specified, CL = 1 TTL Gate and 30pF (unless otherwise noted).quotesdbs_dbs7.pdfusesText_13