PCF85263ATLSLASHA datasheet(72/100 Pages) NXP

72 / 100 page

PCF85263A

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Product data sheet

Rev. 4.1 — 27 November 2015

72 of 100

NXP Semiconductors

PCF85263A

Tiny RTC with alarm, battery switch-over, and I2C-bus

[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 45 on page 50.

[8]

See Table 33 on page 42.

[9]

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

[10] See Table 34 on page 43.

IOH

HIGH-level output

current

output source current;

VOH = 2.9 V;

VDD = 3.3 V;

on pin CLK, TS

IOL

LOW-level output

current

output sink current; VOL =0.4 V;

VDD =3.3 V

on pin SDA

8.5

on pin INTA

on pin CLK

on pin TS

Oscillator

f

osc/fosc

relative oscillator

frequency variation

V

DD = 200 mV; Tamb =25 C

0.075

ppm

tjit

jitter time

LOWJ = 0

[8] -50

-ns

LOWJ = 1

CL(itg)

integrated load

capacitance

on pins OSCO, OSCI;

VDD =3.3 V

[9]

CL = 6 pF

4.8

7.2

CL = 7 pF

5.6

8.4

CL = 12.5 pF

12.5

series resistance

of the quartz; normal drive

[10] -60

100



Table 68.

Characteristics …continued

VDD = 0.9 V to 5.5 V; VSS =0V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs =60 k; CL = 7 pF; all registers in

reset state; unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Litg



OSCI

OSCO





OSCI

OSCO



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PCF85263ATL/A Datasheet(PDF) 72 Page - NXP Semiconductors

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