PCF85263ATLSLASHA datasheet(66/92 Pages) NXP

66 / 92 page

NXP Semiconductors

PCF85263A

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

VDD = 0.9 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; all registers in

reset state; unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

output sink current; VOL = 0.4 V;

VDD = 3.3 V

on pin SDA

8.5

on pin INTA

on pin CLK

IOL

LOW-level output

current

on pin TS

Oscillator

Δfosc/fosc

relative oscillator

frequency variation

ΔVDD = 200 mV; Tamb = 25 °C

0.075

ppm

LOWJ = 0

[8] -

tjit

jitter time

LOWJ = 1

on pins OSCO, OSCI;

VDD = 3.3 V

[9]

CL = 6 pF

4.8

7.2

CL = 7 pF

5.6

8.4

CL(itg)

integrated load

capacitance

CL = 12.5 pF

12.5

series resistance

of the quartz; normal drive

[10] -

100

kΩ

Table 67. Characteristics...continued

[1]

For reliable oscillator start-up at power-on use VDD greater than 1.2 V. If powered up at 0.9 V the oscillator will start but it might be a bit slow, especially if

at high temperature. Normally the power supply is not 0.9 V at start-up and only comes at the end of battery discharge. VDD min of 0.9 V is specified so

that the customer can calculate how large a battery or capacitor they need for their application. VDD min of 1.2 V or greater is needed to ensure speedy

oscillator start-up time.

[2]

400 kHz I2C operation is production tested at 1.8 V. Design methodology allows I2C operation at 1.8 V - 5 % (1.71 V) which has been verified during

product characterization on a limited number of devices.

[3]

Measured after reset and CLK disabled, level of inputs is VDD or VSS.

[4]

Measured after reset, CLK disabled, battery switch disabled and level of inputs is VDD or VSS.

[5]

The I2C-bus interface of PCF85263A is 5 V tolerant.

[6]

Implicit by design.

[7]

See Table 44.

[8]

See Table 32.

[9]

Integrated load capacitance, CL(itg), is a calculation of COSCI and COSCO in series.

[10] See Table 33.

PCF85263A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 5 — 1 February 2021

66 / 92

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