Datasheet
SCAS459D − NOVEMBER 1994 − REVISED OCTOBER 2003
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended ranges of operating free-air temperature and supply
voltage (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
†
SN54ACT1284 SN74ACT1284
UNIT
PARAMETER
TEST CONDITIONS
V
CC
†
MIN TYP MAX MIN TYP MAX
UNIT
V
hys
Input
V
IT+
− V
IT−
for all inputs
5 V 0.4 0.4
V
V
hys
Input
hysteresis
V
IT+
− V
IT−
for all inputs
4.7 V 0.2 0.2
V
B port I
OH
= −14 mA 4.7 V 2.4 2.4
V
OH
A port
I
OH
= −50 µA
MIN
to MAX
V
CC
−0.2 V
CC
−0.2
V
A port
I
OH
= −4 mA 4.7 V 3.7 3.7
B port I
OL
=14 mA 4.7 V 0.4 0.4
V
OL
A port
I
OL
= 50 µA
4.7 V
0.2 0.2
V
V
OL
A port
I
OL
= 4 mA
4.7 V
0.4 0.4
V
I
I
V
I
= V
CC
or GND 5.5 V ±1 ±1 µA
I
OZ
A or B ports
‡
V
O
= V
CC
or GND 5.5 V ±20 ±20 µA
I
off
B port V
I
or V
O
≤ 7 V 0 V ±100 ±100 µA
I
CC
V
I
= V
CC
or GND, I
O
= 0 5.5 V 1.5 1.5 mA
C
i
Control inputs V
I
= V
CC
or GND 5 V 4 4 pF
C
io
A or B ports V
O
= V
CC
or GND 5 V 12 12 pF
Z
O
B port I
OH
= −20 mA, I
OH
= −50 mA 5 V 8 30 8 30 Ω
†
For I/O ports, the parameter I
OZ
includes the input leakage current I
I
.
‡
For conditions shown as MIN or MAX, use the appropriate values under recommended operating conditions.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
SN54ACT1284 SN74ACT1284
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN MAX MIN MAX
UNIT
t
PLH
Totem pole
A or B
B or A
1 20 1 20
ns
t
PHL
Totem pole A or B B or A
1 20 1 20
ns
SR Totem pole B output 0.05 0.4 0.05 0.4 V/ns
t
pd
(EN)
Totem pole
HD
B
1 20 1 20
ns
t
pd
(DIS)
Totem pole HD B
1 20 1 20
ns
t
r
, t
f
Open drain A B 120 120 ns
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