A low-power mask-programmable 4 Kbit read-only memory with 300ps acces
s time is reported. The circuit is implemented in AlGaAs/GaAs HBT tech
nology based on 1.4mum emitter width. Power dissipation for the circui
t is less than 1.2W, which has been minimised through the use of capac
itively-coupled active pull-down circuitry.