Table 18. 1 MHz AC characteristics

Symbol

Alt.

Parameter

Min.

Max.

Unit

fC

fSCL

Clock frequency

0

1

MHz

tCHCL

tHIGH

Clock pulse width high

300

-

ns

tCLCH

tLOW

Clock pulse width low

550

-

ns

tXH1XH2

tR

Input signal rise time

(1)

(1)

ns

tXL1XL2

tF

Input signal fall time

(1)

(1)

ns

tQL1QL2(2)

tF

SDA (out) fall time

-

120

ns

tDXCH

tSU:DAT

Data in setup time

80

-

ns

tCLDX

tHD:DAT

Data in hold time

0

-

ns

tCLQX(3)

tDH

Data out hold time

50

-

ns

tCLQV(4)

tAA

Clock low to next data valid (access time)

-

500

ns

tCHDL

tSU:STA

Start condition setup time

250

-

ns

tDLCL

tHD:STA

Start condition hold time

250

-

ns

tCHDH

tSU:STO

Stop condition setup time

250

-

ns

tDHDL

tBUF

Time between Stop condition and next Start condition

500

-

ns

tWLDL(2)(5)

tSU:WC

WC set up time (before the Start condition)

0

-

µs

tDHWH(2)(6)

tHD:WC

WC hold time (after the Stop condition)

1

-

µs

tW

tWR

Write time

-

5

ms

tNS(2)

-

Pulse width ignored (input filter on SCL and SDA)

-

80

ns

1. There is no min. or max. values for the input signal rise and fall times. It is however recommended by the I²C specification

that the input signal rise and fall times be less than 120 ns when fC < 1 MHz.

2. Characterized only, not tested in production.

3. To avoid spurious Start and Stop conditions, a minimum delay is placed between SCL=1 and the falling or rising edge of

SDA.

4. tCLQV is the time (from the falling edge of SCL) required by the SDA bus line to reach either 0.3 VCC or 0.7 VCC, assuming

that the Rbus × Cbus time constant is within the values specified in Figure 13.

5. WC=0 set up time condition to enable the execution of a WRITE command.

6. WC=0 hold time condition to enable the execution of a WRITE command.

M24512-W M24512-R M24512-DF

DC and AC parameters

DS6520 - Rev 31

page 26/47