ISO721MMDREP datasheet(2/25 Pages) TI

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Vref

OSC

PWM

BIAS

POR

ISO722

Only

Filter

PulseWidth

Demodulation

CarrierDetect

Input

Filter

DataMUX

ACDetect

3-State

OutputBuffer

IsolationBarrier

DCChannel

ACChannel

FUNCTION DIAGRAM

OUT

Vref

POR

ISO721M-EP

SLLS882 – JUNE 2008....................................................................................................................................................................................................... www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

The symmetry of the dielectric and capacitor within the integrated circuitry provides for close capacitive matching,

and allows fast transient voltage changes between the input and output grounds without corrupting the output.

The small capacitance and resulting time constant provide for fast operation with signaling rates(2) from 0 Mbps

(dc) to 100 Mbps for the ISO721/ISO722, and 0 Mbps to 150 Mbps with the ISO721M/ISO722M.

These devices require two supply voltages of 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when

supplied from a 3.3-V supply and all outputs are 4-mA CMOS.

The ISO721 has TTL input thresholds and a noise-filter at the input that prevents transient pulses of up to 2 ns in

duration from being passed to the output of the device.

The ISO721M has CMOS VCC/2 input thresholds, but do not have the noise filter and the additional propagation

delay. These features of the ISO721M also provide for reduced jitter operation.

The ISO721M is characterized for operation over the ambient temperature range of –55°C to 125°C.

(2)

The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps (bits per second).

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