Sofern Du beim Händler um die Ecke noch findest ICM7226A von Intersil. Ansonsten hier bei Littlediode. Kosten etwa 50€

CMOS Design for Very Low Power
Output Drivers Directly Drive Both Digits and Segments of Large 8-Digit LED Displays
Measures Frequencies from DC to 10MHz; Periods from 0.5µs to 10s
Stable High Frequency Oscillator uses either 1MHz or 10MHz Crystal Both Common Anode and Common Cathode Available
Control Signals Available for External Systems Interfacing
Multiplexed BCD Outputs

http://www.intersil.com/data/fn/fn3169.pdf