LM3555TLE datasheet(6/33 Pages) TI

6 / 33 page

LM3555

SNVS594E – JANUARY 2009 – REVISED NOVEMBER 2011

www.ti.com

Electrical Characteristics (continued)

Limits in standard typeface are for TA = +25°C. Limits in boldface type apply over the full operating ambient temperature

range (

−30°C ≤ TA ≤ +85°C). Unless otherwise specified: VIN = 3.6V.

(1) (2)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

CURRENT AND VOLTAGE SPECIFICATIONS

CONTROL INTERFACE VOLTAGE SPECIFICATIONS

Simple Mode

0.54

I2C/EN Pin Voltage

VI2C/EN

2.7V

≤ VIN ≤ 5.5V

Threshold

I2C Mode

1.26

Low-Level Threshold

VIL

Voltage (SCL/EN1 and

2.7V

≤ VIN ≤ 5.5V

0.54

SDA/EN2)

High-Level Threshold

VIH

Voltage (SCL/EN1 and

2.7V

≤ VIN ≤ 5.5V

1.26

SDA/EN2)

Low-Level Output

VOL

Threshold Limit

ILOAD = 3mA

0.4

(SDA/EN2)

CONTROL INTERFACE TIMING SPECIFICATIONS

TI2C-Start

I2C Logic Startup Time

I2C/EN going high

250

500

µsec

fSCL

SCL Clock Frequency

400

kHz

tI2C

I2C Hang-Up Tie

msec

tLOW

Low Period of SCL Clock

1.3

µsec

tHIGH

High Period of SCL Clock

0.6

µsec

Hold Time (repeated)

tHD-STA

0.6

µsec

START Condition

Setup time for a repeated

tSU-STA

0.6

µsec

START condition

tHD-DAT

Data Hold Time

µsec

tSU-DAT

Data Setup Time

100

nsec

Rise Time for SCL and

300

nsec

SDA

Fall Time for SCL and

300

nsec

SDA

Setup Time for Stop

tSU-STO

0.6

µsec

Condition

Bus Free Time between

tBUF

1.3

µsec

Stop and Start Condition

tVD-DAT

Data Valid Time

0.9

µsec

Data Valid Acknowledge

tVD-ACK

0.9

µsec

Time

Capacitive Load for Each

20+0.1xC

400

Bus Line

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