PCF2129 datasheet(66/86 Pages) PHILIPS

66 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

66 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

14. Dynamic characteristics

14.1 SPI-bus timing characteristics

[1]

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

Table 81.

SPI-bus characteristics

VDD = 1.8 V to 4.2 V; VSS =0V; Tamb = 40 C to +85 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 46).

Symbol

Parameter

Conditions

VDD =1.8 V

VDD =4.2 V

Unit

Min

Max

Min

Max

Pin SCL

fclk(SCL)

SCL clock frequency

2.0

6.5

MHz

tSCL

SCL time

800

140

tclk(H)

clock HIGH time

100

tclk(L)

clock LOW time

400

rise time

for SCL signal

100

fall time

for SCL signal

100

Pin SDA/CE

tsu(CE_N)

CE_N set-up time

th(CE_N)

CE_N hold time

trec(CE_N)

CE_N recovery time

100

tw(CE_N)

CE_N pulse width

0.99

Pin SDI

tsu

set-up time

set-up time for SDI data

hold time

hold time for SDI data

Pin SDO

td(R)SDO

SDO read delay time

CL = 50 pF

225

tdis(SDO)

SDO disable time

[1] -90

-25

tt(SDI-SDO)

transition time from

SDI to SDO

to avoid bus conflict

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