Cypress CY14B256K - Manual (Page 22)

CY14B256K
Document Number: 001-06431 Rev. *H Page 22 of 28
RTC Characteristics
Parameter Description Test Conditions Min Max Unit
I
BAK
[25] RTC Backup Current Commercial 300 nA
Industrial 350 nA
V
RTCbat
[26] RTC Battery Pin Voltage 1.8 3.3 V
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
0
–DQ
7
); Read Active
L H H High Z Output Disabled Active
L L X Data in (DQ
0
–DQ
7
); 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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