HEF4520B Dual binary counter
HEF4520BCNV3 From datasheet system
HEF4520BD Dual binary counter
HEF4520BF Dual binary counter
HEF4520BN Dual binary counter
HEF4520BP Dual binary counter
HEF4520BPB Dual binary counter
HEF4520BPN Synchronous Up Counter
HEF4520BT Dual binary counter
HEF4520BTD Synchronous Up Counter
HEF4520BTD-T Synchronous Up Counter
HEF4520BU Dual binary counter