hd74ls669 Renesas Electronics Corporation., hd74ls669 Datasheet - Page 7

• Manufacturer Part Number: hd74ls669
• Description: Synchronous Up / Down 4-bit Binary Counter
• Manufacturer: Renesas Electronics Corporation.

HD74LS669
Waveforms 2
Notes:
Rev.2.00, Feb.18.2005, page 7 of 8
Output
Ripple
Clock
Carry
Q
Q
Q
Q
C
D
1. Input pulse; t
2. For
3. t
A
B
n
10%
is the bit-time when all outputs are low.
t
t
PLH
PLH
max
t
TLH
(Measure at
1.3V 1.3V
t
TLH
90%
(Measure before
1 clock of t
1.3V
1.3V
t
= t
TLH
n
+ 1)
THL
t
THL
15 ns, t
10%
2.5 ns.
n
t
w (CK)
+ 16)
THL
t
t
t
t
t
PHL
PHL
PHL
PHL
1.3V
PHL
6 ns, PRR = 1 MHz, duty cycle 50%.
(Measure at t
(Measure at t
(Measure at t
(Measure at
1.3V
1.3V
1.3V
1.3V
1.3V
(Measure at t
t
n
+ 16)
n
n
n
+ 2)
+ 4)
+ 8)
n
+ 16)
t
t
t
PLH
PLH
PLH
1.3V
(Measure at t
1.3V
(Measure at t
1.3V
(Measure at t
1.3V
n
n
n
+ 2)
+ 4)
+ 8)
3V
0V
V
V
V
V
V
V
V
V
V
V
OH
OL
OH
OL
OH
OL
OH
OL
OH
OL