Cypress Semiconductor Perform nvSRAM Spezifikationen PDF herunterladen (Seite 18)

CY14B256KA

Document Number: 001-55720 Rev. *H Page 18 of 28

AC Test Conditions

Input pulse levels ...................................................0 V to 3 V

Input rise and fall times (10%–90%) ............................ <3 ns

Input and output timing reference levels ....................... 1.5 V

AC Test Loads

Figure 7. AC Test Loads

3.0 V

OUTPUT

5 pF

789 

3.0 V

OUTPUT

30 pF

789 

577 

RTC Characteristics

Over the Operating Range

Parameter Description Min Typ

[15]

Max Units

RTCbat

RTC battery pin voltage 1.8 3.0 3.6 V

BAK

[16]

RTC backup current

(Refer Figure 5 for the recommended external componets

for RTC)

(Min) – – 0.35 µA

25 °C – 0.35 – µA

(Max) – – 0.5 µA

RTCcap

[17]

RTC capacitor pin voltage T

(Min) 1.6 – 3.6 V

25 °C 1.5 3.0 3.6 V

(Max) 1.4 – 3.6 V

OCS

RTC oscillator time to start – 1 2 sec

RTCp

RTC processing time from end of ‘W’ bit set to ‘0’ – – 350 s

BKCHG

RTC backup capacitor charge current-limiting resistor 350 – 850 

Notes

15. Typical values are at 25 °C, V

= V

CC(Typ)

. Not 100% tested.

16. From either V

RTCcap

or V

RTCbat

17. If V

RTCcap

> 0.5 V or if no capacitor is connected to V

RTCcap

pin, the oscillator starts in t

OCS

time. If a backup capacitor is connected and V

RTCcap

< 0.5 V, the capacitor

must be allowed to charge to 0.5 V for oscillator to start.

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