PCF85263ATLSLASHA datasheet(69/92 Pages) NXP

69 / 92 page

NXP Semiconductors

PCF85263A

Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus

aaa-010607

-0.4

-0.2

0.2

0.4

VDD (V)

Δfosc/fosc

(ppm)

(1)

(2)

(3)

Tamb = 25 °C.

1. CL(itg) = 12.5 pF.

2. CL(itg) = 6 pF.

3. CL(itg) = 7 pF.

Figure 42. Oscillator frequency variation with respect to VDD

VDD = 1.8 V to 5.5 V; VSS = 0 V; Tamb = -40 °C to +85 °C; fosc = 32.768 kHz; quartz Rs = 60 kΩ; CL = 7 pF; unless otherwise

specified. All timing values are valid within the operating supply voltage and temperature range and referenced to VIL and

VIH with an input voltage swing of VSS to VDD [1] .

Symbol

Parameter

Conditions

Min

Max

Unit

capacitive load for

each bus line

400

fSCL

SCL clock frequency

[2] 0

400

kHz

tHD;STA

hold time (repeated)

START condition

0.6

μs

tSU;STA

set-up time for a

repeated START

condition

0.6

μs

tLOW

LOW period of the

SCL clock

1.3

μs

tHIGH

HIGH period of the

SCL clock

0.6

μs

rise time of both SDA

and SCL signals

300

fall time of both SDA

and SCL signals

[3] [4] 20 × (VDD / 5.5 V) 300

tBUF

bus free time between

a STOP and START

condition

1.3

μs

tSU;DAT

data set-up time

100

Table 68. I2C-bus characteristics

PCF85263A

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Product data sheet

Rev. 5 — 1 February 2021

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