DS3234(2006) 데이터 시트보기 (PDF) - Maxim Integrated

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DS3234
(Rev.:2006)

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM

Maxim Integrated 

Extremely Accurate SPI Bus RTC with

Integrated Crystal and SRAM

Pushbutton Reset Timing

RST

PBDB

tRST

VCC

VPF(MAX)

VPF(MIN)

RST

VPF

tVCCF

Power-Switch Timing

VPF

tVCCR

tREC

WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may

cause loss of data.

Note 1: Limits at -40°C are guaranteed by design and not production tested.

Note 2: All voltages are referenced to ground.

Note 3: Measured at VIH = 0.8 x VCC or VIL = 0.2 x VCC, 10ns rise/fall time, DOUT = no load.

Note 4: Current is the averaged input current, which includes the temperature conversion current. CRATE1 = CRATE0 = 0.

Note 5: The RST pin has an internal 50kΩ (nominal) pullup resistor to VCC.

Note 6: Measured at VOH = 0.8 x VCC or VOL = 0.2 x VCC. Measured from the 50% point of SCLK to the VOH minimum of DOUT.

Note 7: With 50pF load.

Note 8: The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set over the voltage range of

0V ≤ VCC ≤ VCC(MAX) and 2.3V ≤ VBAT ≤ VBAT(MAX).

Note 9: This delay only applies if the oscillator is enabled and running. If the EOSC bit is 1, tREC is bypassed and RST immediately

goes high.

Note 10: Guaranteed by design and not production tested.

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