AC Electrical Characteristics
V
EE
= −4.2V to −5.7V, V
CC
= V
CCA
= GND
Symbol
t
PZH
t
PHZ
t
PZH
t
PHZ
t
PZH
t
PHZ
t
TZH
t
THZ
Parameter
Propagation Delay
Data to Output
Propagation Delay
Data Enable to Output
Propagation Delay
Common Enable to Output
Transition Time
20% to 80%, 80% to 20%
T
C
= −55˚C
Min
0.70
0.50
0.60
1.00
0.70
0.90
0.20
0.20
Max
3.70
3.60
3.60
4.20
3.60
4.00
2.00
1.80
T
C
= +25˚C
Min
1.10
1.10
1.10
1.50
1.00
1.40
0.20
0.20
Max
3.60
3.10
3.60
3.60
3.50
3.40
2.00
1.60
T
C
= +125˚C
Min
1.20
1.20
1.30
1.60
1.20
1.40
0.20
0.20
Max
3.60
3.50
3.80
4.00
3.60
3.80
2.00
1.60
ns
ns
ns
ns
Units
Conditions
Figures 1, 2
Note 7:
The specified limits represent the “worst case” value for the parameter. Since these “worst case” values normally occur at the temperature extremes, ad-
ditional noise immunity and guard banding can be achieved by decreasing the allowable system operating ranges.
Note 8:
Conditions for testing shown in the tables are chosen to guarantee operation under “worst case” conditions.
Test Circuitry
DS100312-5
Notes:
V
CC
, V
CCA
= +2V, V
EE
= −2.5V
L1 and L2 = equal length 50Ω impedance lines
R
T
= 50Ω terminator internal to scope
Decoupling 0.1 µF from GND to V
CC
and V
EE
All unused outputs are loaded with 25Ω to GND
C
L
= Fixture and stray capacitance
≤
3 pF
Pin numbers shown are for flatpak; for DIP see logic symbol
FIGURE 1. AC Test Circuit
www.national.com
4
NSC [ NATIONAL SEMICONDUCTOR ]
