54LS279 Datasheet, PDF (4/8 Pages) National Semiconductor (TI) – Quad S-R Latches

Switching Characteristics at V_CC e 5V and T_A e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
R_L e 2 kX
C_L e 15 pF
C_L e 50 pF
Units
Min
Max
Min
Max
t_PLH
Propagation Delay Time
S to
Low to High Level Output
Q
22
25
ns
t_PHL
Propagation Delay Time
S to
High to Low Level Output
Q
15
23
ns
t_PHL
Propagation Delay Time
R to
High to Low Level Output
Q
27
33
ns
Obsolete
3