Philips Semiconductors
Product specification
Octal transceiver with direction pin
and 30Ω series termination resistors (3-State)
74ABT2245
AC CHARACTERISTICS
GND = 0V; t
R
= t
F
= 2.5ns; C
L
= 50pF, R
L
= 500Ω
LIMITS
SYMBOL
PARAMETER
WAVEFORM
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
An to Bn or Bn to An
Output enable time
to High and Low level
Output disable time
from High and Low Level
1
2
2
1.0
1.0
1.3
3.0
1.5
1.0
T
amb
= +25°C
V
CC
= +5.0V
Typ
2.8
3.9
3.5
5.5
4.0
3.4
Max
4.2
5.0
4.6
7.0
5.4
4.6
T
amb
= –40°C to +85°C
V
CC
= +5.0V
±0.5V
Min
1.0
1.0
1.3
3.0
1.5
1.0
Max
4.7
5.4
5.5
7.8
6.3
5.0
ns
ns
ns
UNIT
AC WAVEFORMS
V
M
= 1.5V, V
IN
= GND to 3.0V
OE
INPUT
V
M
An or Bn
INPUT
V
M
V
M
t
PZL
t
PLH
t
PHL
OUTPUT
Bn or An
OUTPUT
V
M
t
PZH
t
PHZ
V
OL
+ 0.3V
V
OL
V
OH
V
OH
– 0.3V
OUTPUT
V
M
0V
SA00314
V
M
t
PLZ
3.5V
V
M
V
M
SA00124
Waveform 1. Waveforms Showing the Input to Output
Propagation Delays
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
6
PHILIPS [ NXP SEMICONDUCTORS ]
