PCF85263ATLSLASHA datasheet(86/92 Pages) NXP

86 / 92 page

NXP Semiconductors

PCF85263A

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

Document ID

Release date

Data sheet status

Change notice

Supersedes

PCF85263A v.3

20150116

Product data sheet

PCF85263A v.2

Modifications:

• Corrected Figure 36, Section 2

• Corrected Vth values in Table 67

• Added ESD values of PCF85263AT in Table 66

PCF85263A v.2

20140710

Product data sheet

PCF85263A v.1

20140418

Product data sheet

Table 73. Revision history...continued

[1]

The die paddle (exposed pad) is connected to VSS through high ohmic (non-conductive) silicon attach and should be electrically isolated. It is good

engineering practice to solder the exposed pad to an electrically isolated PCB copper pad as shown in Figure 46 for better heat transfer but it is not

required as the RTC doesn’t consume much power. In no case should traces be run under the package exposed pad.

[2]

Default values. The duty cycle of the CLKOUT when outputting 32,768 Hz could change from 60:40 to 40:60 depending on the detector since the 32,768

Hz is derived from the oscillator output which is not perfect. It could change from device to device and it depends on the silicon diffusion. There is nothing

that can be done from outside the chip to influence the duty cycle.

[3]

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.

[4]

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.

PCF85263A

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

Product data sheet

Rev. 5 — 1 February 2021

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