[Gb-ccb] Opto-isolators

[Martin Shepherd]

With regard to the question of whether opto-isolators exist that are
fast enough for the phase-switch control lines, it appears that yes,
there are a few possibilities.

The chips that I have found, from NTE and Fairchild Semiconductor,
have maximum propagation delays of 75ns or 100ns. They all have
open-collector logic gate outputs, so they would need both Vcc and GND
from the receiver box, in addition to the signalling lines.

For the record, the following is a list of the devices that I found.

  NTE3094
    http://www.nteinc.com/specs/3000to3099/pdf/nte3094.pdf
    This is a dual 8-pin opto-isolator with open-collector
    NAND gate outputs, and a maximum propagation delay of 75ns.

  Fairchild 6N137, HCPL-0600, HCPL0601, HCPL2601, HCPL-2611
    http://www.fairchildsemi.com/ds/HC/HCPL-0600.pdf  (etc)
    These are all single 8-pin opto-isolators with open-collector
    outputs, and a maximum propagation delay of 75ns.

  Fairchild: HCPL-2630, HCPL-2631
    http://www.fairchildsemi.com/ds/HC/HCPL-2630.pdf
    These are both dual 8-pin opto-isolators with open-collector
    outputs, and a maximum propagation delay of 75ns.

  Fairchild: 74OL6000, 74OL6001
    http://www.fairchildsemi.com/ds/74/74OL6000.pdf
    These are both single 6-pin opto-isolators with TTL compatible
    inputs and logic-gate open-collector outputs. They have a maximum
    propagation delay of 100ns, and can be configured to be inverting
    or non-inverting.

Martin