2.3.2

AC Parameters: I2C Interface

Figure 2-3. I2C Synchronous Data Timing

SCL

SDA IN

SDA OUT

t

F

t

HIGH

t

LOW

t

LOW

t

R

t

AA

t

DH

t

BUF

t

SU.STO

t

SU.DAT

t

HD.DAT

t

HD.STA

t

SU.STA

Table 2-4. AC Characteristics of I2C Interface(2)

Unless otherwise specified, applicable over recommended operating range from TA = -40°C to +100°C, VCC = +2.0V to +5.5V, CL

= 1 TTL Gate and 100 pF.

Parameter

Sym.

Min.

Max.

Units

SCL Clock Frequency

fSCL

0

1

MHz

SCL High Time

tHIGH

400

—

ns

SCL Low Time

tLOW

400

—

ns

Start Setup Time

tSU.STA

250

—

ns

Start Hold Time

tHD.STA

250

—

ns

Stop Setup Time

tSU.STO

250

—

ns

Data In Setup Time

tSU.DAT

100

—

ns

Data In Hold Time

tHD.DAT

0

—

ns

Input Rise Time1

tR

—

300

ns

Input Fall Time1

tF

—

100

ns

Clock Low to Data Out Valid

tAA

50

550

ns

Data Out Hold Time

tDH

50

—

ns

SMBus Time-Out Delay

tTIMEOUT

25

75

ms

Time bus must be free before a new transmission can start1

tBUF

500

—

ns

Notes: 

1.

Values are based on characterization and are not tested.

2.

AC measurement conditions:

– RL (connects between SDA and VCC): 1.2 kΩ (for VCC = +2.0V to +5.0V)

– Input pulse voltages: 0.3VCC to 0.7VCC

– Input rise and fall times: ≤ 50 ns

– Input and output timing reference voltage: 0.5VCC

ATECC608B

Electrical Characteristics

© 2020 Microchip Technology Inc.

Summary Datasheet

DS40002239A-page 9