PCF2131 datasheet(64/85 Pages) NXP

64 / 85 page

NXP Semiconductors

PCF2131

Nano-power highly accurate RTC with integrated quartz crystal

10 Dynamic characteristics

10.1 SPI-bus timing characteristics

VDD = 1.2 V to 5.5 V; VSS = 0 V; Tamb = -40 °C to +105 °C, unless otherwise specified. All timing values are valid within the

operating supply voltage at ambient temperature and referenced to VIL and VIH with an input voltage swing of VSS to VDD

(see Figure 40).

VDD = 1.2 V to 3.3 V

VDD = 3.3 V to

5.5 V

Symbol

Parameter

Conditions

Min

Max

Min

Max

Unit

Pin SCL

fclk(SCL)

SCL clock frequency

0.5

6.5

MHz

tclk(H)

clock HIGH time

1000

tclk(L)

clock LOW time

1000

rise time

for SCL signal

100

fall time

for SCL signal

100

Pin SDA/CE

tsu(CE_N)

CE_N set-up time

300

th(CE_N)

CE_N hold time

325

trec(CE_N) CE_N recovery time

1500

tw(CE_N)

CE_N pulse width

0.99

Pin SDI

tsu

set-up time

set-up time for SDI data

250

hold time

hold time for SDI data

250

Pin SDO

td(R)SDO

SDO read delay time CL = 50 pF

550

tdis(SDO)

SDO disable time

[1] -

150

Table 91. SPI-bus characteristics

[1]

No load value; bus is held up by bus capacitance; use RC time constant with application values.

PCF2131

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Product data sheet

Rev. 2.0 — 5 October 2023

64 / 85

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