RV-3049 datasheet(55/65 Pages) MICROCRYSTAL

55 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

55/65

7.5. SPI INTERFACE DYNAMIC CHARACTERISTICS

VSS= 0 V; Tamb= -40°C to +125°C. All timing values are valid within the operating supply voltage range and

references to VIL and VIH with an input voltage swing from VSS to VDD.

PARAMETER

SYMBOL

CONDITIONS

VDD = 1.4V

VDD = 1.8V

VDD = 3.0V

VDD = 5.0V

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

MIN

MAX

SCL clock frequency

fclk(SCL)

0.2

0.6

1.0

MHz

SCL time

tSCL

1.7

Clock HIGH time

tclk(H)

1500

700

400

Clock LOW time

tclk(L)

1500

700

400

Rise time

for SCL signal

800

200

Fall time

for SCL signal

800

200

CE setup time

tsu(CE)

100

CE hold time

th(CE)

500

300

200

CE recovery time

trec(CE)

400

300

200

CE pulse width

tw(CE)

Measured after valid

sub address is

received

0.49

Setup time

tsu

Setup time for SDI

data

Hold time

Hold time for SDI

data

500

300

200

SDO read delay time

td(R)SDO

Bus load = 50pF

1300

650

350

SDO disable time

tdis(SDO)

No load value; bus

will be held up by

bus capacitance;

use RC time

constant with

application values

200

100

Transition time SDI to SDO

tt(SDI-SDO)

Prepare for 0ns to

avoid bus conflict

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