Datasheet

Philips Semiconductors Product specification
74ABT244Octal buffer/line driver (3-State)
1998 Jan 16
5
AC CHARACTERISTICS
GND = 0V; t
R
= t
F
= 2.5ns; C
L
= 50pF, R
L
= 500Ω
74ABT244
SYMBOL PARAMETER WAVEFORM
T
amb
= +25°C
V
CC
= +5.0V
T
amb
= –40°C to +85°C
V
CC
= +5.0V ±0.5V
UNIT
Min Typ Max Min Max
t
PLH
t
PHL
Propagation delay
An to Yn
1
1.0
1.0
2.6
2.9
4.1
4.2
1.0
1.0
4.6
4.6
ns
t
PZH
t
PZL
Output enable time
to High and Low level
2
1.1
2.1
3.1
4.1
4.6
5.6
1.1
2.1
5.1
6.1
ns
t
PHZ
t
PLZ
Output disable time
from High and Low level
2
2.1
1.7
4.1
2.7
5.6
5.2
2.1
1.7
6.6
5.7
ns
AC WAVEFORMS
V
M
= 1.5V, V
IN
= GND to 3.0V
INPUT
1.5V
OUTPUT
t
PLH
t
PHL
SA00028
1.5V
1.5V 1.5V
3 V
0 V
V
OH
V
OL
Waveform 1. Waveforms Showing the Input (An) to Output (Yn)
Propagation Delays
Output Control
(Low-level
enabling
1.5 V
t
PZH
t
PHZ
V
OH
V
OL
t
PZL
t
PLZ
3.5V
0V
V
OL
+ 0.3V
V
OH
– 0.3V
SA00029
1.5 V
1.5 V 1.5 V
0V
3V
Output
Waveform 1
S1 at 7 V
(see Note)
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.
Output
Waveform 2
S1 at Open
(see Note)
Waveform 2. Waveforms Showing the 3-State Output Enable
and Disable Times
TEST CIRCUIT AND WAVEFORMS
C
L
= 50 pF
500 Ω
Load Circuit
DEFINITIONS
C
L
= Load capacitance includes jig and probe capacitance;
see AC CHARACTERISTICS for value.
TEST S1
t
pd
open
t
PLZ
/t
PZL
7 V
t
PHZ
/t
PZH
open
SA00012
500 Ω
From Output
Under Test
S1
7 V
Open
GND