Cypress CY14B256K Bedienungsanleitung PDF herunterladen (Seite 22)

CY14B256K

Document Number: 001-06431 Rev. *H Page 22 of 28

RTC Characteristics

Parameter Description Test Conditions Min Max Unit

BAK

[25]

RTC Backup Current Commercial 300 nA

Industrial 350 nA

RTCbat

[26]

RTC Battery Pin Voltage 1.8 3.3 V

RTCcap

[27]

RTC Capacitor Pin Voltage 1.2 2.7 V

tOCS RTC Oscillator Time to Start At Min Temperature from Power up or Enable 10 sec

At 25°C Temperature from Power up or Enable 5 sec

Truth Table For SRAM Operations

HSB should remain HIGH for SRAM Operations.

CE WE OE Inputs and Outputs Mode Power

H X X High Z Deselect/Power down Standby

L H L Data Out (DQ

–DQ

); Read Active

L H H High Z Output Disabled Active

L L X Data in (DQ

–DQ

); Write Active

Notes

25. From either V

RTCcap

or V

RTCbat.

26. Typical = 3.0V during normal operation.

27. Typical = 2.4V during normal operation.

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