Cypress Semiconductor Perform nvSRAM Especificaciones descargar pdf (Pagina 10)

CY14B256KA

Document Number: 001-55720 Rev. *H Page 10 of 28

RTC External Components

The RTC requires connecting an external 32.768 kHz crystal and

, C

load capacitance as shown in the Figure 5. The figure

shows the recommnded RTC external component values. The

load capacitances C

and C

are inclusive of parasitic of the

printed circuit board (PCB). The PCB parasitic includes the

capacitance due to land pattern of crystal pads/pins, X

out

pads and copper traces connecting crystal and device pins.

Figure 4. Interrupt Block Diagram

WDF - Watchdog Timer Flag

WIE - Watchdog Interrupt

PF - Power Fail Flag

PFE - Power Fail Enable

AF - Alarm Flag

AIE - Alarm Interrupt Enable

P/L - Pulse Level

H/L - High/Low

Enable

Watchdog

Timer

Power

Monitor

Clock

Alarm

VINT

WDF

WIE

PFE

AIE

P/L

Driver

H/L

INT

Figure 5. RTC Recommended Component Configuration

[5]

out

Recommended Values

= 32.768 kHz (12.5 pF)

= 10 pF

= 67 pF

Note: The recommended values for C1 and C2 include

board trace capacitance.

Note

5. For nonvolatile static random access memory (nvSRAM) real time clock (RTC) design guidelines and best practices, see application note AN61546.

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