CY14B256K データシートの表示（PDF） - Cypress Semiconductor

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CY14B256K

256 Kbit (32K x 8) nvSRAM with Real Time Clock

Cypress Semiconductor 

Watchdog

Timer

Power

Monitor

VINT

Clock

Alarm

WDF

WIE

PF

PFE

AF

AIE

Figure 5. Interrupt Block Diagram

CY14B256K

P/L

VCC

Pin

Driver

H/L

VSS

WDF - Watchdog Timer Flag

WIE - Watchdog Interrupt

Enable

PF - Power Fail Flag

INT

PFE - Power Fail Enable

AF - Alarm Flag

AIE - Alarm Interrupt Enable

P/L - Pulse Level

H/L - High/Low

Figure 6. RTC Recommended Component Configuration

DQ 0

A3

A2

A1

A0

X1

X2

Recommended Values:

Y1 = 32.768KHz

RF = 10M Ohm

C1 = 0 (install cap footprint, but leave unloaded)

C2 = 56 pF + 10% (do not vary from this value)

Note

4. Schottky diodes, (VF < 0.4V with IF at 100mA) are recommended at pins A0 - A3 and DQ0 in applications where undershoot exceeds -0.5V. Please see application note

AN49947 for further details.

Document Number: 001-06431 Rev. *H

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