HD74UH04
Rev.4.00, Feb.02.2004, page 4 of 6
Switching Characteristics(CL = 15 pF, tr = tf = 6 ns, VCC = 5 V)
Ta = 25°C
Item Symbol Min Typ Max Unit Test Conditions
Output rise/fall time tTLH
tTHL
— 5 10 ns See Test circuit
Propagation delay time tPLH
tPHL
— 7 15 ns See Test circuit
(CL = 50 pF, tr = tf = 6 ns)
Ta = 25°C Ta = –40 to 85°C
Item Symbol
VCC
(V) Min Typ Max Min Max Unit Test Conditions
2.0 — 50 125 — 155
4.5 — 14 25 — 31
Output rise/fall time tTLH
tTHL
6.0 — 12 21 — 26
ns See Test circuit
2.0 — 48 100 — 125
4.5 — 12 20 — 25
Propagation delay time tPLH
tPHL
6.0 — 9 17 — 21
ns See Test circuit
Input capacitance CIN ——510— 10
Equivalent capacitance CPD ——10—— —
pF
Note: CPD is equivalent capacitance inside of the IC calculated from the operating current without load (see
test circuit). The average operating current without load is calculated according to the expression
below.
ICC(opr) = CPD• VCC• fIN + ICC