HD74HC490 Datasheet, PDF (4/8 Pages) Hitachi Semiconductor – Dual 4-bit Decade Counters

HD74HC490
AC Characteristics (C_L = 50 pF, Input t_r = t_f = 6 ns)
Ta = 25°C
Ta = –40 to
+85°C
Item
Maximum clock
frequency
Symbol
f _max
V_CC (V)
2.0
4.5
Min Typ Max Min
——4 —
— — 20 —
Max Unit Test Conditions
3
MHz
16
6.0
— — 24 — 19
Propagation delay t_PLH
time
t _PHL
2.0
— — 120 — 150 ns Clock to Q_A
4.5
— 13 24 — 30
6.0
— — 20 — 26
t _PLH
2.0
— — 205 — 255 ns Clock to Q_B Q_C
t _PHL
4.5
— 21 41 — 51
6.0
— — 35 — 43
t _PLH
2.0
— — 280 — 350 ns Clock to Q_C
t _PHL
4.5
— 23 56 — 70
6.0
— — 48 — 60
t _PHL
2.0
— — 205 — 255 ns Clear to any output
4.5
— 18 41 — 51
6.0
— — 35 — 43
t _PLH
2.0
— — 205 — 255 ns Set-to-9 to Q_A, Q_D
4.5
— 13 41 — 51
6.0
— — 35 — 43
t _PHL
2.0
— — 190 — 240 ns Set-to-9 to Q_B, Q_C
4.5
— 17 38 — 48
6.0
— — 32 — 41
Pulse width
t_w
2.0
80 — — 100 — ns
4.5
16 6 — 20 —
6.0
14 — — 17 —
Setup time
t _su
2.0
100 — — 125 — ns
4.5
20 1 — 25 —
6.0
17 — — 21 —
Output rise/fall
t _TLH
time
t _THL
2.0
— — 75 — 95 ns
4.5
— 5 15 — 19
6.0
— — 13 — 16
Input capacitance Cin
—
— 5 10 — 10 pF
4