74ACT1284
HIGH SPEED IEEE1284 TRANSCEIVER
s
s
s
s
s
s
s
HIGH SPEED:
T
PD
= 6.5 ns (Max. 85°C) at V
CC
= 4.5V
LOW POWER DISSIPATION:
I
CC
= 80 µA (MAX.) at V
CC
= 5.5V T = 85 °C
TTL COMPATIBLE INPUTS
V
IH
= 2V (Min.) V
IL
= 0.8V (Max.)
OPERATING VOLTAGE RANGE:
V
CC
(OPR.) = 4.5V to 5.5V
A Port have standard 4mA totem pole output
B Port high drive source/sink capability of
14mA
Support IEEE Std 1284-I (level 1 type) and
IEEE Std 1284-II (level 2 type) for bidirectional
parallel communications between personal
computer and printing peripherals.
SOP
TSSOP
ORDER CODES
PACKAGE
SOP
TSSOP
TUBE
74ACT1284M
T&R
74ACT1284MTR
74ACT1284TTR
PIN CONNECTION
DESCRIPTION
The 74ACT1284 contains four high-speed non-in-
verting bidirectional buffers and three non-invert-
ing buffers with open drain outputs fabricated in
silicon gate C
2
MOS technology.
It’s intended to provide a standard signaling meth-
od for a bidirection parallel peripheral in an Ex-
tended Capabilities Port mode (ECP).
The HD (active High) input pin enables the B ports
to switch from Open Drain to a high drive totem
pole output, capable of sourcing 14mA on all sev-
en buffers. The DIR input determines the direction
of data flow on the bidirectional buffers.
DIR (active High) enables data flow from A Port to
B Port. DIR (active Low) enables data flow from B
Port to A Port.
ESD protection is greater than 2000V per Method
3015.7 of MIL-STD-883B. It’s available in the
commercial temperature ranges.
July 2003
1/11
74ACT1284
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
IA
V
IB
V
OA
V
OB
I
IK
I
OK
I
O
Supply Voltage
DC Input Voltage A Side
DC Input Voltage B Side
DC Output Voltage A Side
DC Output Voltage B Side
DC Input Diode Current
DC Output Diode Current
DC Output Current
Parameter
Value
-0.5 to +7
-0.5 to V
CC
+ 0.5
-2 to +7
(1)
-0.5 to V
CC
+ 0.5
-2 to +7
(1)
±
20
±
50
±
50
±
200
-65 to +150
300
Unit
V
V
V
V
V
mA
mA
mA
mA
°C
°C
I
CC
or I
GND
DC V
CC
or Ground Current
Storage Temperature
T
STG
T
L
Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
(1) The AC input voltage pulse width is limited to 20ns if the input voltage goes more negative than -0.5V.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
T
op
Supply Voltage
Input Voltage
Output Voltage
HD = LOW
Operating Temperature
Parameter
Value
4.5 to 5.5
0 to V
CC
0 to 5.5
-40 to 85
Unit
V
V
V
°C
3/11
74ACT1284
DC ELECTRICAL CHARACTERISTICS
Test Condition
Symbol
Parameter
V
CC
(V)
4.5 to 5.5
4.5 to 5.5
4.5
4.5
4.5
4.5
5.5
5.5
5.5
5.5
0
5.0
5.0
I
OH
= -14mA
I
O
= -50µA
I
O
= -4mA
I
OH
= 14mA
I
O
= 50µA
I
O
= 4mA
V
I
= V
CC
or GND
(DIR,A5,A6,A7,HD)
V
I
= V
CC
- 2.1V
V
I
= V
CC
or GND
V
O
= V
CC
or GND
V
O
= 5.25V
V
T+
= V
T
V
B
= V
OH
8
0.4
3.86
4.4
3.86
0.4
0.1
0.36
±
0.1
0.6
8
±
0.5
4
0.35
24
Value
T
A
= 25°C
Min.
2.0
0.8
3.76
4.4
3.76
0.4
0.1
0.44
±
1
1.5
80
±
5
40
Typ.
Max.
-40 to 85°C
Min.
2.0
0.8
Max.
V
V
V
V
V
V
µA
mA
µA
µA
µA
V
Ω
Unit
V
IH
V
IL
V
OHB
V
OHA
V
OLB
V
OLA
I
I
I
CCT
I
CC
I
OZ
I
OFF
V
HYS
Z
O
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
B Port
High Level Output Voltage
A Port
Low Level Output Voltage
B Port
Low Level Output Voltage
A Port
Input Current
Max I
CC
/Input
Quiescent Supply Current
Output Leakage Current
B Side Power Down Leakage
Current
Input HysteresIs
Output Impedance B Port
AC ELECTRICAL CHARACTERISTICS
(f = 1MHz, t
r
= t
f
= 2.5ns)
Test Condition
Symbol
Parameter
V
CC
(V)
4.5 to 5.5
4.5 to 5.5
R
L
=500Ω, C
L
=50pF
(fig. 1-2)
R
L
=500Ω, C
L
=50pF
(fig. 3)
R
S
=33Ω, R
L
=62Ω
C
L
=50pF (fig. 2)
R
PULL_UP
=500Ω
C
L
=50pF (fig. 4)
4
12
Value
T
A
= 25°C
Min.
1
1
1
1
1
1
Typ.
Max.
5.6
5.6
7.5
7.5
7.5
7.5
120
-40 to 85°C
Min.
1
1
1
1
1
1
Max.
6.5
6.5
8.5
8.5
8.5
8.5
120
ns
ns
ns
ns
ns
pF
pF
Unit
t
PLH
t
PHL
t
PLH
t
PHL
t
EN
t
DIS
t
r,
t
f
C
I
C
I/O
Propagation Delay Time
A1 - A7 to B1 - B7
Propagation Delay Time
B1 - B4 to A1 - A4
Enable Delay Time
HD to B1 - B7
Disable Delay Time
HD to B1 - B7
t
rise
, t
fall
B1 - B7 Open Drain
Control Input Capacitance
(HD, DIR, A5 - A7)
I/O Pin Capacitance
4.5 to 5.5
4.5 to 5.5
Open
5.0
4/11