4 / 4 page January 1995 4 Philips Semiconductors Product speciﬁcation HEX non-inverting buffers HEF4050B buffers AC CHARACTERISTICS V SS = 0 V; T amb =25 °C; C L = 50 pF; input transition times ≤ 20 ns V DD V SYMBOL TYP. MAX. TYPICAL EXTRAPOLATION FORMULA Propagation delays 5 35 70 ns 26 ns + (0,18 ns/pF) C L I n O n 10 t PHL 20 35 ns 16 ns + (0,08 ns/pF) C L HIGH to LOW 15 15 30 ns 12 ns + (0,05 ns/pF) C L 5 55 110 ns 28 ns + (0,55 ns/pF) C L LOW to HIGH 10 t PLH 25 55 ns 14 ns + (0,23 ns/pF) C L 15 20 40 ns 12 ns + (0,16 ns/pF) C L Output transition 5 25 50 ns 7 ns + (0,35 ns/pF) C L times 10 t THL 10 20 ns 3 ns + (0,14 ns/pF) C L HIGH to LOW 15 7 14 ns 2 ns + (0,09 ns/pF) C L 5 60 120 ns 10 ns + (1,0 ns/pF) C L LOW to HIGH 10 t TLH 30 60 ns 9 ns + (0,42 ns/pF) C L 15 20 40 ns 6 ns + (0,28 ns/pF) C L V DD V TYPICAL FORMULA FOR P ( µW) Dynamic power 5 3 800 f i +∑ (f o C L ) × V DD2 where dissipation per 10 11 600 f i +∑ (f o C L ) × V DD2 f i = input freq. (MHz) package (P) 15 65 900 f i +∑ (f o C L ) × V DD2 f o = output freq. (MHz) C L = load capacitance (pF) ∑ (f o C L ) = sum of outputs V DD = supply voltage (V)