AD5251 datasheet(7/28 Pages) AD

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AD5251/AD5252

Rev. 0 | Page 7 of 28

INTERFACE TIMING CHARACTERISTICS

Guaranteed by design, not subject to production test. See Figure 3 for location of measured values. All input control voltages are

specified with tR = tF = 2.5 ns (10% to 90% of 3 V), and timed from a voltage level of 1.5 V. Switching characteristics are measured

using both VDD = 3 V and 5 V.

Table 3. Interface Timing and EEMEM Reliability Characteristics (All Parts).

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

INTERFACE TIMING

SCL Clock Frequency

fSCL

400

kHz

tBUF Bus Free Time between STOP and

START

1.3

µs

tHD;STA Hold Time (Repeated START)

After this period, the first clock pulse

is generated

0.6

µs

tLOW Low Period of SCL Clock

1.3

µs

tHIGH High Period of SCL Clock

0.6

µs

tSU;STA Setup Time For START Condition

0.6

µs

tHD;DAT Data Hold Time

0.9

µs

tSU;DAT Data Setup Time

100

tF Fall Time of Both SDA and SCL Signals

300

tR Rise Time of Both SDA and SCL Signals

300

tSU;STO Setup Time for STOP Condition

t10

0.6

µs

EEMEM Data Storing Time

tEEMEM_STORE

EEMEM Data Restoring Time at

Power-On1

tEEMEM_RESTORE1

VDD rise time dependent. Measure

without decoupling capacitors at VDD

and VSS.

300

µs

EEMEM Data Restoring Time Upon

Restore Command or RESET Operation1

tEEMEM_RESTORE2

VDD = 5 V

300

µs

EEMEM Rewritable Time (delay time after

Power On or RESET before EEMEM can

be written)

tEEMEM_REWRITE

540

µs

FLASH/EE MEMORY RELIABILITY

Endurance2

100

kCycles

Data Retention3

100

Years

1 During power-up, all outputs preset to midscale before restoring to the final EEMEM contents. RDAC0 has the shortest, whereas RDAC3 has the longest EEMEM data

restoring time.

2 Retention lifetime equivalent at junction temperature TJ = 55°C per JEDEC Std. 22, Method A117. Retention lifetime based on an activation energy of 0.6 eV derates

with junction temperature.

3 When the part is not in operation, the SDA and SCL pins should be pulled to high. When these pins are pulled to low, the I2C interface at these pins conducts current of

about 0.8 mA at VDD = 5.5 V and 0.2 mA at VDD = 2.7 V.

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