[sci.electronics] info on transceivers with low voltage swing on output wanted

collins@vicom.com (Tracy Collins) (07/20/90)

Specifically, I am looking for a pin-compatible replacement for
an F245 octal transceiver.

Requirements are:

	B bus must handle 64 mA
	A bus must handle 20 mA
	B bus has low (~3 V) voltage swing
	prop delay of 7 ns, max.

As you may have guessed, I need this part to reduce noise
on a backplane by reducing the voltage swing of the backplane
signals.  The other possibility of reducing the noise is to
slow the edge rate.  Are there transceivers with edge rate 
(slew rate) control, pin-compatible with the 245?

Any info is greatly appreciated.

thanks

tracy

-- 
tracy collins		
vicom systems, inc.	"Even though you don't think it's right,
collins@vicom.com	 I _like_ to bite."  - Humpty
w:(415)498-3280

BENJY@mathom.cisco.com (Benjy Levy) (07/20/90)

Look at the IDT limited swing families. 74FCTXXXT 74FCTXXXAT and 74FCTXXXCT.
Varying speeds are available with the current spec you want.

	Benjy Levy

richm@amc-gw.amc.com (Rich Moran) (07/23/90)

In article <1990Jul19.172230.9515@vicom.com> collins@vicom.com (Tracy Collins) writes:
}Specifically, I am looking for a pin-compatible replacement for
}an F245 octal transceiver.
}
}Requirements are:
}
}	B bus must handle 64 mA
}	A bus must handle 20 mA
}	B bus has low (~3 V) voltage swing
}	prop delay of 7 ns, max.
}
}As you may have guessed, I need this part to reduce noise
}on a backplane by reducing the voltage swing of the backplane
}signals.  The other possibility of reducing the noise is to
}slow the edge rate.  Are there transceivers with edge rate 
}(slew rate) control, pin-compatible with the 245?

National Semiconductor has a family they call the 'Quiet' series, which
is a BiCMOS process with controlled edge rates and ~3V swing.  I believe
that performance is similar to FAST parts.
=============================================
Rich Moran
richm@amc.com
=============================================
-- 
=============================================
Rich Moran
richm@amc.com
=============================================