DS1340_06 datasheet(4/14 Pages) MAXIM

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I2C RTC with Trickle Charger

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POWER-UP/POWER-DOWN CHARACTERISTICS

(TA = -40°C to +85°C) (Figure 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Recovery at Power-Up

tREC

(Note 17)

VCC Fall Time; VPF(MAX) to

VPF(MIN)

tVCCF

300

µs

VCC Rise Time; VPF(MIN) to

VPF(MAX)

tVCCR

0µs

WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery-backup mode.

Note 1:

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

Note 2:

After this period, the first clock pulse is generated.

Note 3:

A device must internally provide a hold time of at least 300ns for the SDA signal (referred to as the VIH(MIN) of the SCL

signal) to bridge the undefined region of the falling edge of SCL.

Note 4:

The maximum tHD:DAT only has to be met if the device does not stretch the low period (tLOW) of the SCL signal.

Note 5:

A fast-mode device can be used in a standard-mode system, but the requirement tSU:DAT ≥ to 250ns must be met. This

is automatically the case if the device does not stretch the low period of the SCL signal. If such a device does stretch the

low period of the SCL signal, it must output the next data bit to the SDA line tR MAX + tSU:DAT = 1000 + 250 = 1250ns

before the SCL line is released.

Note 6:

CB—total capacitance of one bus line in pF.

Note 7:

The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set over the 0V ≤ VCC ≤

VCCMAX and 1.3V ≤ VBAT ≤ 3.7V range.

Note 8:

All voltages are referenced to ground.

Note 9:

Measured at VCC = typ, VBACKUP = 0V, register 08h = A5h.

Note 10:

The use of the 250Ω trickle-charge resistor is not allowed at VCC > 3.63V and should not be enabled.

Note 11:

Measured at VCC = typ, VBACKUP = 0V, register 08h = A6h.

Note 12:

Measured at VCC = typ, VBACKUP = 0V, register 08h = A7h.

Note 13:

ICCA—SCL clocking at max frequency = 400kHz.

Note 14:

Specified with I2C bus inactive.

Note 15:

Measured with a 32.768kHz crystal attached to the X1 and X2 pins.

Note 16:

Limits at +25°C are guaranteed by design and not production tested.

Note 17:

This delay applies only if the oscillator is enabled and running. If the oscillator is disabled or stopped, no power-up delay

occurs.

SDA

SCL

tHD:STA

tLOW

tHIGH

tBUF

tHD:DAT

tSU:DAT

REPEATED

START

tSU:STA

tHD:STA

tSU:STO

tSP

STOP

START

Figure 1. Data Transfer on I2C Serial Bus

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