M74LCX646
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Table 8: AC Electrical Characteristics
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW (t
OSLH
= | t
PLHm
- t
PLHn
|, t
OSHL
= | t
PHLm
- t
PHLn
|)
2) Parameter guaranteed by design
Table 9: Capacitive Characteristics
1) C
PD
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/8 (per circuit)
Symbol Parameter
Test Condition Value
Unit
V
CC
(V)
C
L
(pF)
R
L
(Ω)
t
s
= t
r
(ns)
-40 to 85 °C -55 to 125 °C
Min. Max. Min. Max.
t
PLH
t
PHL
Propagation Delay
Time (CAB or CBA
to An or Bn)
2.7
50 500 2.5
1.5 9.5 1.5 9.5
ns
3.0 to 3.6 1.5 8.5 1.5 8.5
t
PLH
t
PHL
Propagation Delay
Time (An to Bn or Bn
to An)
2.7
50 500 2.5
1.5 8.0 1.5 8.0
ns
3.0 to 3.6 1.5 7.0 1.5 7.0
t
PLH
t
PHL
Propagation Delay
Time (SAB or SBA
to An or Bn)
2.7
50 500 2.5
1.5 9.5 1.5 9.5
ns
3.0 to 3.6 1.5 8.5 1.5 8.5
t
PZL
t
PZH
Output Enable Time
(G
, DIR to An, Bn)
2.7
50 500 2.5
1.5 9.5 1.5 9.5
ns
3.0 to 3.6 1.5 8.5 1.5 8.5
t
PLZ
t
PHZ
Output Disable Time
(G
, DIR to An, Bn)
2.7
50 500 2.5
1.5 9.5 1.5 9.5
ns
3.0 to 3.6 1.5 8.5 1.5 8.5
t
S
Setup Time, HIGH or
LOW level Data to
CAB, CBA
2.7
50 500 2.5
2.5 2.5
ns
3.0 to 3.6 2.5 2.5
t
h
Hold Time, HIGH or
LOW level Data to
CAB, CBA
2.7
50 500 2.5
1.5 1.5
ns
3.0 to 3.6 1.5 1.5
t
W
CAB, CBA Pulse
Width, HIGH or
LOW
2.7
50 500 2.5
4.0 4.0
ns
3.0 to 3.6 3.3 3.3
f
MAX
Clock Pulse
Frequency
3.0 to 3.6 50 500 2.5 150 150 MHz
t
OSLH
t
OSHL
Output To Output
Skew Time (note1,
2)
3.0 to 3.6 50 500 2.5 1.0 1.0 ns
Symbol Parameter
Test Condition Value
Unit
V
CC
(V)
T
A
= 25 °C
Min. Typ. Max.
C
IN
Input Capacitance
3.3
V
IN
= 0 to V
CC
6pF
C
I/O
I/O Capacitance
3.3
V
IN
= 0 to V
CC
10 pF
C
PD
Power Dissipation Capacitance
(note 1)
3.3 f
IN
= 10MHz
V
IN
= 0 or V
CC
37
pF
