DS3234SN datasheet(5/21 Pages) MAXIM

Part #	DS3234SN

Description	Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM

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Manufacturer	MAXIM [Maxim Integrated Products]

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Extremely Accurate SPI Bus RTC with

Integrated Crystal and SRAM

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5

Pushbutton Reset Timing

tRST

PBDB

RST

Power-Switch Timing

VCC

VPF(MAX)

RST

VPF(MIN)

tVCCF

tVCCR

tREC

VPF

Note 2: Limits at -40°C are guaranteed by design and not production tested.

Note 3: All voltages are referenced to ground.

Note 4: Measured at VIH = 0.8 x VCC or VIL = 0.2 x VCC, 10ns rise/fall time, DOUT = no load.

Note 5: Current is the averaged input current, which includes the temperature conversion current. CRATE1 = CRATE0 = 0.

Note 6: The RST pin has an internal 50k

Ω (nominal) pullup resistor to VCC.

Note 7: 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 8: With 50pF load.

Note 9: 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 10: 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 11: Guaranteed by design and not production tested.

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

cause loss of data.

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