MCP79400 datasheet(4/42 Pages) MICROCHIP

Part #	MCP79400

Description	I2C Real-Time Clock/Calendar with SRAM, Unique ID and Battery Switchover

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Manufacturer	MICROCHIP [Microchip Technology]

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MCP7940X

DS25009C-page 4

 2011 Microchip Technology Inc.

TABLE 1-2:

AC CHARACTERISTICS

Electrical Characteristics:

Industrial (I):

VCC = +1.8V to 5.5V

TA = -40°C to +85°C

Param.

No.

Symbol

Characteristic

Min.

Max.

Units

Conditions

1FCLK

Clock frequency

—

100

400

kHz

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

2THIGH

Clock high time

4000

600

—

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

3TLOW

Clock low time

4700

1300

—

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

4TR

SDA and SCL rise time

(Note 1)

—

1000

300

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

5TF

SDA and SCL fall time

(Note 1)

—

1000

300

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

6THD:STA Start condition hold time

4000

600

—

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

7TSU:STA

Start condition setup time

4700

600

—

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

8THD:DAT Data input hold time

0

—

ns

9TSU:DAT Data input setup time

250

100

—

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

10

TSU:STO Stop condition setup time

4000

600

—

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

11

TAA

Output valid from clock

—

3500

900

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

12

TBUF

Bus free time: Time the bus

must be free before a new

transmission can start

4700

1300

—

ns

1.8V

 VCC < 2.5V

2.5V

 VCC  5.5V

13

TSP

Input filter spike suppression

(SDA and SCL pins)

—50

ns

(Note 1 and Note 2)

14

TWC

Write cycle time (byte or

page)

—5

ms

—

15

—

Endurance

1M

—

cycles 25°C, VCC = 5.5V Page mode

(Note 3)

Note 1: Not 100% tested.

2: The combined TSP and VHYS specifications are due to new Schmitt Trigger inputs, which provide improved

noise spike suppression. This eliminates the need for a TI specification for standard operation.

3: This parameter is not tested but ensured by characterization. For endurance estimates in a specific

application, please consult the Total Endurance™ Model which can be obtained from Microchip’s web site

at www.microchip.com.

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