Datasheet

©1999 Fairchild Semiconductor Corporation www.fairchildsemi.com
74LVT244, 74LVTH244 Rev. 1.5.0 5
74LVT244, 74LVTH244 — Low Voltage Octal Buffer/Line Driver with 3-STATE Outputs
Dynamic Switching Characteristics
(7)
Notes:
7. Characterized in SOIC package. Guaranteed parameter, but not tested.
8. Max number of outputs defined as (n). n–1 data inputs are driven 0V to 3V. Output under test held LOW.
AC Electrical Characteristics
Notes:
9. All typical values are at V
CC
= 3.3V, T
A
= 25°C.
10. Skew is defined as the absolute value of the difference between the actual propagation delay for any two
separate outputs of the same device. The specification applies to any outputs switching in the same direction,
either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
). Parameter guaranteed by design.
Capacitance
(11)
Note:
11. Capacitance is measured at frequency f = 1MHz, per MIL-STD-883, Method 3012.
Symbol Parameter V
CC
(V)
Conditions T
A
= 25°C
UnitsC
L
= 50pF, R
L
= 500Ω Min. Typ. Max.
V
OLP
Quiet Output Maximum
Dynamic V
OL
3.3
(8)
0.8 V
V
OLV
Quiet Output Minimum
Dynamic V
OL
3.3
(8)
–0.8 V
Symbol Parameter
T
A
= –40°C to +85°C
C
L
= 50pF, R
L
= 500Ω
Units
V
CC
= 3.3V ± 0.3V V
CC
= 2.7V
Min. Typ.
(9)
Max. Min. Max.
t
PLH
Propagation Delay, Data to Output 1.1 3.8 1.1 4.0 ns
t
PHL
1.3 3.9 1.3 4.2
t
PZH
Output Enable Time 1.1 4.5 1.1 5.3 ns
t
PZL
1.4 4.4 1.4 5.0
t
PHZ
Output Disable Time 1.9 4.9 1.9 5.1 ns
t
PLZ
1.8 4.4 1.8 4.4
t
OSHL
, t
OSLH
Output to Output Skew
(10)
1.0 1.0 ns
Symbol Parameter Conditions Typical Units
C
IN
Input Capacitance V
CC
= 0V, V
I
= 0V or V
CC
3pF
C
OUT
Output Capacitance V
CC
= 3.0V, V
O
= 0V or V
CC
6pF