Philips Semiconductors
Product specification
Octal buffer/line driver (3-State)
74ABT244
AC CHARACTERISTICS
GND = 0V; t
R
= t
F
= 2.5ns; C
L
= 50pF, R
L
= 500Ω
74ABT244
SYMBOL
PARAMETER
WAVEFORM
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
An to Yn
Output enable time
to High and Low level
Output disable time
from High and Low level
1
2
2
1.0
1.0
1.1
2.1
2.1
1.7
T
amb
= +25°C
V
CC
= +5.0V
Typ
2.6
2.9
3.1
4.1
4.1
2.7
Max
4.1
4.2
4.6
5.6
5.6
5.2
T
amb
= –40°C to +85°C
V
CC
= +5.0V
±0.5V
Min
1.0
1.0
1.1
2.1
2.1
1.7
Max
4.6
4.6
5.1
6.1
6.6
5.7
ns
ns
ns
UNIT
AC WAVEFORMS
V
M
= 1.5V, V
IN
= GND to 3.0V
3V
3V
1.5V
INPUT
0V
t
PLH
t
PHL
V
OH
1.5V
OUTPUT
V
OL
Output
Waveform 2
S1 at Open
(see Note)
1.5V
Output
Waveform 1
S1 at 7 V
(see Note)
t
PZH
t
PZL
t
PLZ
1.5V
Output Control
(Low-level
enabling
1.5 V
1.5 V
0V
3.5V
1.5 V
t
PHZ
V
OH
– 0.3V
1.5 V
0V
Note:
Waveform 1 is for an output with internal conditions such that
the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that
the output is high except when disabled by the output control.
V
OL
+ 0.3V
V
OL
V
OH
SA00028
Waveform 1. Waveforms Showing the Input (An) to Output (Yn)
Propagation Delays
SA00029
Waveform 2. Waveforms Showing the 3-State Output Enable
and Disable Times
TEST CIRCUIT AND WAVEFORMS
7V
From Output
Under Test
C
L
= 50 pF
500
Ω
S1
Open
GND
500
Ω
Load Circuit
TEST
t
pd
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
open
7V
open
DEFINITIONS
Load capacitance includes jig and probe capacitance;
C
L
=
see AC CHARACTERISTICS for value.
SA00012
1998 Jan 16
5
PHILIPS [ NXP SEMICONDUCTORS ]
