HD74HCT540 Datasheet, PDF (4/9 Pages) Hitachi Semiconductor – Octal Buffers/Line Drivers (with 3-state outputs)

HD74HCT540/HD74HCT541
AC Characteristics (C_L = 50 pF, Input t_r = t_f = 6 ns)
Item
Symbol
Propagation delay t_PLH
time
t _PHL
t _PLH
t _PHL
Output enable
t _ZL
time
t _ZH
Output disable
t _LZ
time
t _HZ
Output rise/fall
t _TLH
time
t _THL
Input capacitance Cin
Ta = 25°C
Ta = –40 to
+85°C
Min Typ Max Min Max
— 11 20 — 25
— 12 20 — 25
— 10 23 — 29
— 13 23 — 29
— 16 30 — 38
— 20 30 — 38
— 15 30 — 38
— 15 30 — 38
— 4 12 — 15
— 4 12 — 15
— 5 10 — 10
Unit
ns
ns
ns
ns
ns
pF
Test Conditions
V_CC (V)
4.5
HD74HCT540 only
4.5
4.5
HD74HCT541 only
4.5
4.5
4.5
4.5
4.5
4.5
4.5
—
4