HD74HC646 Datasheet, PDF (7/10 Pages) Hitachi Semiconductor – Octal Bus Transceivers/Registers with Multiplexed 3-state outputs

HD74HC646/HD74HC648
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
——5 —
— — 27 —
Max Unit
4
ns
21
6.0
— — 32 — 25
Propagation delay t_PLH
time
t _PHL
2.0
— — 170 — 215 ns
4.5
— 14 34 — 43
6.0
— — 29 — 37
t _PLH
2.0
— — 150 — 190 ns
t _PHL
4.5
— 14 30 — 38
6.0
— — 26 — 33
t _PLH
2.0
— — 220 — 275 ns
t _PHL
4.5
— 18 44 — 55
6.0
— — 37 — 47
t _PLH
2.0
— — 170 — 215 ns
t _PHL
4.5
— 15 34 — 43
6.0
— — 29 — 37
t _PLH
2.0
— — 170 — 215 ns
t _PHL
4.5
— 16 34 — 43
6.0
— — 29 — 37
Output enable
t _ZH
time
t _ZL
2.0
— — 150 — 190 ns
4.5
— 17 30 — 38
6.0
— — 26 — 33
Output disable
t _LZ
time
t _HZ
2.0
— — 150 — 190 ns
4.5
— 20 30 — 38
6.0
— — 26 — 33
Setup time
t _su
2.0
100 — — 125 — ns
4.5
20 3 — 25 —
6.0
17 — — 21 —
Hold time
t_h
2.0
5 —— 5
— ns
4.5
5 0 —5
—
6.0
5 —— 5
—
Test Conditions
Clock AB to B or
Clock BA to A
A or B input to B or A output
(HD74HC646 only)
A or B input to B or A output
(HD74HC648 only)
Clock BA or Clock AB input to
A or B output
Select BA or Select AB input to
A or B output, with A or B high
Select BA or Select AB input to
A or B output, with A or B low
Control G input or Direction to
A or B output
Control G input to A or B
output
7