Datasheet

MOTOROLA CMOS LOGIC DATAMC14512B
372
SWITCHING CHARACTERISTICS (C
L
= 50 pF, T
A
= 25 C, See Figure 1)
Characteristic
Symbol
V
DD
All Types
Unit
Characteristic
Symbol
V
DD
Typ # Max
Unit
Output Rise and Fall Time
t
TLH
, t
THL
= (1.5 ns/pF) C
L
+ 25 ns
t
TLH
, t
THL
= (0.75 ns/pF) C
L
+ 12.5 ns
t
TLH
, t
THL
= (0.55 ns/pF) C
L
+ 9.5 ns
t
TLH
,
t
THL
5.0
10
15
100
50
40
200
100
80
ns
Propagation Delay Time (Figure 2)
Inhibit, Control, or Data to Z
t
PLH
5.0
10
15
330
125
85
650
250
170
ns
Propagation Delay Time (Figure 2)
Inhibit, Control, or Data to Z
t
PHL
5.0
10
15
330
125
85
650
250
170
ns
3–State Output Delay Times (Figure 3)
“1” or “0” to High Z, and
High Z to “1” or “0”
t
PHZ
, t
PLZ
,
t
PZH
, t
PZL
5.0
10
15
60
35
30
150
100
75
ns
* The formulas given are for the typical characteristics only at 25 C.
#Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance.
Figure 1. Power Dissipation Test Circuit and Waveform
V
DD
I
D
C
L
Z
DISABLE
INHIBIT
A
B
C
X0
X1
X2
X3
X4
X5
X6
X7
V
SS
PULSE
GENERATOR
50%V
in
50%
DUTY
CYCLE
Parameter Test Conditions
Inhibit to Z A, B, C = V
SS
, X
O
= V
DD
A, B, C to Z Inh = V
SS
, X
O
= V
DD
Figure 2. AC Test Circuit and Waveforms
V
DD
V
SS
V
OH
V
OL
V
DD
V
SS
V
OH
V
OL
V
DD
C
L
Z
DISABLE
INHIBIT
A
B
C
X0
X1
X2
X3
X4
X5
X6
X7
V
SS
PULSE
GENERATOR
20 ns
20 ns
90%
50%
10%
t
PLH
t
PHL
90%
10%
50%
DATA
Z
t
TLH
t
THL
TEST CONDITIONS:
INHIBIT = V
SS
A, B, C = V
SS
20 ns 20 ns
t
PHL
t
PLH
50%
90%
10%
t
THL
t
TLH
Z
INHIBIT,
A, B, OR C
90%
50%
10%