Comparison Between TTL ,CMOS & BICMOS

TTL

74 - the "standard TTL" logic family had no letters between the "74" and the specific part number.
74L - Low power (compared to the original TTL logic family), very slow
H - High speed (still produced but generally superseded by the S-series, used in 1970s era computers)
S - Schottky (obsolete)
LS - Low Power Schottky
AS - Advanced Schottky
ALS - Advanced Low Power Schottky
F - Fast (faster than normal Schottky, similar to AS) 

CMOS

C - CMOS 4–15 V operation similar to buffered 4000 (4000B) series
HC - High speed CMOS, similar performance to LS, 12 nS
HCT - High speed, compatible logic levels to bipolar parts
AC - Advanced CMOS, performance generally between S and F
AHC - Advanced High-Speed CMOS, three times as fast as HC
ALVC - Low voltage - 1.65 to 3.3 V, Time Propagation Delay (TPD) 2 nS[7]
AUC - Low voltage - 0.8 to 2.7 V, TPD < 1.9 nS@1.8 V[7]
FC - Fast CMOS, performance similar to F
LCX - CMOS with 3 V supply and 5 V tolerant inputs
LVC - Low voltage – 1.65 to 3.3 V and 5 V tolerant inputs, tpd < 5.5 nS@3.3 V, tpd < 9 nS@2.5 V[7]
LVQ - Low voltage - 3.3 V
LVX - Low voltage - 3.3 V with 5 V tolerant inputs
VHC - Very High Speed CMOS - 'S' performance in CMOS technology and power

BiCMOS

BCT - BiCMOS, TTL-compatible input thresholds, used for buffers
ABT - Advanced BiCMOS, TTL-compatible input thresholds, faster than ACT and BCT