ADuM1253

Ultra-Low-Power, I2C Isolator with

Unidirectional SCL, Extended VDD,

Idle-Bus Hot-Swap, and Low VOL

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Analog Devices | 8

(VDD1 - VGND1 = 1.71V to 5.5V, VDD2 - VGND2 = 1.71V to 5.5V, CL = 20pF, TA = -40°C to +125°C, unless otherwise noted. (Note 5)

Typical values are at VDD1 - VGND1 = 3.3V, VDD2 - VGND2 = 3.3V, TA = +25°C, unless otherwise noted. )

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Power Loss to

Output High-Z

tHi-Z

Opposite VDD_ falling below VUVLO_

0.4

ms

HOT SWAP/BUS STUCK TIMER, SIDE 2

Precharge Voltage

VPRECHG

SDA2/SCL2 open,

VDD2 > 0.6V

At power-up

0.3 x

VDD2

V

Precharge Thevenin

Equivalent Impedance

RPRECHG

SDA2/SCL2 open,

VDD2 > 0.6V

At power-up

140

kΩ

Precharge Glitch Filter

on SDA2/SCL2

tPRE_GLITCH

VDD2 rising above

VUVLO_

At power-up

220

ns

Hot-Swap Detection

Enable Time

tHS_EN

At power-up

102

ms

SDA2/SCL2 Idle

Detection Time

tIDLE

After tHS_EN

At power-up

75

μs

Bus Stuck Timeout

tSTUCK

Either SDA1 or SCL1 low

102

ms

Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.

Note 2: All currents into the device are positive. All currents out of the device are negative. All voltages are referenced to their

respective ground (GND1 or GND2), unless otherwise noted.

Note 3: The supply current does not include any current entering the SDA_/SCL_ pins. Current is after successful hot-swap

connection. R1 = R2 = 1kΩ, CL1 = CL2 = 10pF.

Note 4: This is the minimum difference between the output logic-low level and the input logic threshold. This ensures that there is

no possibility of the part latching up the bus to which it is connected.

Note 5: Not production tested. Guaranteed by design.

Note 6: CMTI is the maximum sustainable common-mode voltage slew rate while maintaining operation. CMTI applies to both

rising and falling common-mode voltage edges. Tested with the transient generator connected between GND1 and GND2

(VCM = 1000V).