74ABT244 Datasheet, PDF (5/10 Pages) NXP Semiconductors – Octal buffer/line driver 3-State

Philips Semiconductors
Octal buffer/line driver (3-State)
Product specification
74ABT244
AC CHARACTERISTICS
GND = 0V; t_R = t_F = 2.5ns; C_L = 50pF, R_L = 500Ω
SYMBOL
PARAMETER
WAVEFORM
t_PLH
Propagation delay
t_PHL
An to Yn
1
t_PZH
Output enable time
t_PZL
to High and Low level
2
t_PHZ
Output disable time
t_PLZ
from High and Low level
2
AC WAVEFORMS
V_M = 1.5V, V_IN = GND to 3.0V
3V
INPUT
1.5V
t_PLH
1.5V
t_PHL
0V
V_OH
OUTPUT
1.5V
1.5V
V_OL
SA00028
Waveform 1. Waveforms Showing the Input (An) to Output (Yn)
Propagation Delays
TEST CIRCUIT AND WAVEFORMS
From Output
Under Test
C_L = 50 pF
500 Ω
500 Ω
7V
S1
Open
GND
Load Circuit
TEST
S1
t_pd
t_PLZ/t_PZL
t_PHZ/t_PZH
open
7V
open
DEFINITIONS
C_L = Load capacitance includes jig and probe capacitance;
see AC CHARACTERISTICS for value.
SA00012
74ABT244
T_amb = +25°C
V_CC = +5.0V
Min
Typ
Max
T_amb = –40°C to +85°C
V_CC = +5.0V ±0.5V
Min
Max
1.0
2.6
4.1
1.0
4.6
1.0
2.9
4.2
1.0
4.6
1.1
3.1
4.6
1.1
5.1
2.1
4.1
5.6
2.1
6.1
2.1
4.1
5.6
2.1
6.6
1.7
2.7
5.2
1.7
5.7
UNIT
ns
ns
ns
Output Control
(Low-level
enabling
1.5 V
3V
1.5 V
t_PZL
Output
Waveform 1
S1 at 7 V
(see Note)
t_PZH
Output
Waveform 2
S1 at Open
(see Note)
1.5 V
1.5 V
t_PLZ
t_PHZ
0V
3.5V
V_OL + 0.3V
V_OL
V_OH
V_OH – 0.3V
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.
SA00029
Waveform 2. Waveforms Showing the 3-State Output Enable
and Disable Times
1998 Jan 16
5