Browse Prior Art Database

CMOS L1L2 Latch Which Captures Bipolar Levels

IP.com Disclosure Number: IPCOM000121159D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 41K

Publishing Venue

IBM

Related People

Adams, RD: AUTHOR [+3]

Abstract

By converting bipolar signals to FET levels, bipolar signals are received in an L1L2 CMOS latch for use in FET logic while using minimal DC power. This low power latch technique can capture true and complement data which is only several hundred millivolts apart and finds useful application especially in a BiCMOS environment.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

CMOS L1L2 Latch Which Captures Bipolar Levels

      By converting bipolar signals to FET levels, bipolar signals
are received in an L1L2 CMOS latch for use in FET logic while using
minimal DC power.  This low power latch technique can capture true
and complement data which is only several hundred millivolts apart
and finds useful application especially in a BiCMOS environment.

      Referring to the figure, the L1 latch is made up of P type
transistors T7 and T8 and N type transistors T9 and T10.  To capture
data into the L1 latch, clock C0 is brought active (high).  At this
time, clocks A0 and B0 are inactive (high).  N type transistor T11 is
turned off and P type transistors T5 and T6 are turned on by output
of inverter I, node C0N, going low.  This allows signals from nodes
D0N and D0 to be brought onto latch nodes L1C and L1T.  When clock C0
is brought inactive (low), the data is set into the latch in a
similar fashion to a CMOS latched sense amplifier.

      Scanning into and out of the latch is done in a typical
fashion.  CMOS data may be scanned into the L1 latch through port I0
by bringing clock A0 active (low).  Data can be scanned into the L2
latch by bringing B0 clock active (low). Flush-through is
accomplished by bringing both A0 and B0 active (low) at the same
time.

      Disclosed anonymously.