DM74AS157

 Switching specifications at 50 pF
Switching specifications guaranteed over full temperature and V _CC range
Advanced oxide-isolated, ion-implanted Schottky TTL process
Functionally and pin for pin compatible with Schottky,
low power Schottky, and advanced low power Schottky TTL counterpart
Improved AC performance over Schottky, low power
Schottky, and advanced low power Schottky counterparts
Expand any data input point
Multiplex dual data buses
General four functions of two variables (one variable is common)
Source programmable counters