HD74HCT449 Datasheet, PDF (4/8 Pages) Hitachi Semiconductor – Quad. Bus Transceivers with Individual Direction Controls

HD74HCT449
AC Characteristics (C_L = 50 pF, Input t_r = t_f = 6 ns)
Item
Symbol
Propagation delay t_PHL
time
t _PLH
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
— 14 25 — 31
— 11 25 — 31
— 18 30 — 39
— 14 30 — 39
— 17 30 — 39
— 16 30 — 39
— 4 12 — 15
— 4 12 — 15
— 5 10 — 10
Unit
ns
ns
ns
ns
pF
Test Conditions
V_CC (V)
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
—
4