Philips
Semiconductors
74HCT1284
Parallel printer interface transceiver/buffer
Product specification
Supersedes data of 1995 Jun 27
IC06 Data Handbook
1998 Jul 10
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
74HCT1284
Parallel printer interface transceiver/buffer
2
1998 Jul 10
8531768 19693
FEATURES
Asynchronous operation
4-Bit transceivers
3 additional buffer/driver lines
TTL compatible inputs
ESD protection exceeds 2000V per MIL STD 883 Method 3015
and 200V per Machine Model
Input Hysteresis
Low Noise Operation
Center Pin V
CC
& GND
IEEE 1284 Compliant Level 1 & 2
Overvoltage Protection on B side
DESCRIPTION
The 74HCT1284 parallel interface chip is designed to provide an
asynchronous, 4-bit, bi-directional, parallel printer interface for
personal computers. Three additional lines are included to provide
handshaking signals between the host and the peripheral. The part
is designed to match IEEE 1284 standard.
The 4 transceiver pins (A/B 1-4) allow data transmission from the A
bus to the B bus, or from the B bus to the A bus, depending on the
state of the direction pin DIR.
The B bus and the Y5-Y7 lines have totem pole or open drain style
outputs depending on the state of the high drive enable pin HD.
The A bus only has totem pole style outputs. All inputs are TTL
compatible with at least 400mV of input hysteresis at V
CC
= 5.0V.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
T
amb
= 25
C; GND = 0V
TYPICAL
UNIT
t
PLH
t
PHL
Propagation delay
Bn to An
C
L
= 50pF; V
CC
= 5V
5.3
5.6
ns
ns
C
IN
Input capacitance A
n
, DIR, HD
V
I
= 0V or V
CC
5
pF
C
OUT
Output capacitance B
n
, Y
n
V
O
= 0V or V
CC
; 3-State
14
pF
I
CC
Total supply current
V
CC
= 5.5V
500
nA
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
ORDER CODE
DRAWING NUMBER
20-pin plastic DIP
0
C to +70
C
74HCT1284N
SOT146-1
20-pin plastic SOL
0
C to +70
C
7HCT1284D
SOT163-1
20-pin plastic SSOP Type II
0
C to +70
C
74HCT1284DB
SOT339-1
20-pin plastic TSSOP Type I
0
C to +70
C
74HCT1284PW
SOT360-1
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
A1
A2
A3
A4
GND
GND
A5
A6
A7
DIR
B1
B2
B3
B4
V
CC
V
CC
Y5
Y7
Y6
HD
SK00001
PIN DESCRIPTION
PIN NUMBER
SYMBOL
FUNCTION
1,2,3,4
20,19,18,17
A1 - A4
B1 - B4
Data inputs/outputs
7,8,9
14,13,12
A5 - A7
Y5 - Y7
Buffer/Driver lines
10,11
DIR,HIGH
DRIVE
Direction, Drive
5,6
GND
Ground (0V)
15,16
V
CC
Positive supply voltage
Philips Semiconductors
Product specification
74HCT1284
Parallel printer interface transceiver/buffer
1998 Jul 10
3
LOGIC SYMBOL
DIR
HD
Y7
A7
A
Y
Y6
A6
A
Y
Y5
A5
A
Y
B4
A4
A
B
A
B
B2
A2
A
B
A
B
B3
A3
B1
A1
SK00009
FUNCTION TABLE
INPUTS
OUTPUTS
INPUTS/OUTPUTS
DIR
HD
A5-7
Y5-7
A1-4
B1-4
L
L
L
L
A = B
Inputs
L
L
H
Z
A = B
Inputs
L
H
L
L
A = B
Inputs
L
H
H
H
A = B
Inputs
H
L
L
L
Inputs Low
Outputs Low
H
L
H
Z
Inputs High
Outputs Z
H
H
L
L
Inputs
B = A
H
H
H
H
Inputs
B = A
H = High Voltage
L = Low Voltage
Z = High Impedance, Off-State
ABSOLUTE MAXIMUM RATINGS
1, 2
SYMBOL
PARAMETER
CONDITIONS
RATING
UNIT
V
CC
DC supply voltage
0.5 to +6.5
V
I
IK
DC input diode current
V
I
< 0
20
mA
V
I
DC input voltage
3
2 to +7.0
V
I
OK
DC output diode current
V
O
< 0
50
mA
V
OUT
DC output voltage
3
Output in Off or High state
0.5 to +5.5
V
I
OUT
DC output current
Output in Low state
50
mA
T
stg
Storage temperature range
65 to 150
C
I
CC
/I
GND
Continuous current through V
CC
or GND
200
mA
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150
C.
3. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
MIN
MAX
UNIT
V
CC
DC supply voltage
4.7
5.5
V
V
I
Input voltage
0
V
CC
V
V
IH
High-level input voltage
2.0
V
V
IL
Low-level Input voltage
0.8
V
I
OH
High-level output current
14
mA
I
OL
Low-level output current
14
mA
T
amb
Operating free-air temperature range
0
+70
C
Philips Semiconductors
Product specification
74HCT1284
Parallel printer interface transceiver/buffer
1998 Jul 10
4
DC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
T
amb
= 25
C
T
amb
= 0
C to +70
C
UNIT
MIN
TYP
MAX
MIN
MAX
A
V
CC
= Min to Max; I
OH
= 50
A
V
CC
0.2
V
CC
V
CC
0.2
V
V
OH
High-level
output voltage
A
n
V
CC
= 4.7V; I
OH
= 4mA
4.3
4.6
3.7
V
out ut voltage
B
n
or Y
n
V
CC
= 4.7V; I
OH
= 14mA
2.6
2.9
2.4
V
Low-level
A
n
V
CC
= Min to Max; I
OL
= 50
A;
V
I
= V
IL
or V
IH
0
0.2
0.2
V
V
OL
Low-level
output voltage
n
V
CC
= 4.7V; I
OL
= 4mA; V
I
= V
IL
or V
IH
0.1
0.25
0.4
V
B
n
or Y
n
V
CC
= 4.7V; I
OL
= 14mA; V
I
= V
IL
or V
IH
0.15
0.3
0.4
V
V
HYS
Input Hysteresis
V
CC
= 5.0V
0.4
0.50
0.4
V
R
D
B/Y side Output
Impedance
See Figure 1
8
15
22
8
22
I
I
Input leakage current
(A5A7)
V
CC
= 5.5V; V
O
= V
CC
or GND
0.5
1.0
5.0
A
I
OFF
B/Y Side Power-off
leakage current
V
CC
= 0.0V; V
O
= 0 to 7V
1
10
100
A
I
OZH
3-State output High
current Y
n
V
CC
= 5.5V; V
O
= V
CC
; V
I
= V
IL
or V
IH
1
5
20
A
I
OZL
3-State output Low
current Y
n
V
CC
= 5.5V; V
O
= GND; V
I
= V
IL
or V
IH
1
5
20
A
I
IH
+I
OZH
current
(
A
1
A
4
, B
n
)
V
CC
= 5.5V; V
I/O
= V
CC
1
5
25
A
I
IL
+I
OZL
current
(
A
1
A
4
, B
n
)
V
CC
= 5.5V; V
I/O
= GND
1
5
25
A
I
CC
Quiescent Supply
Current
V
CC
= 5.5V; I
O
= 0; V
I
= GND or V
CC
0.5
250
400
A
Philips Semiconductors
Product specification
74HCT1284
Parallel printer interface transceiver/buffer
1998 Jul 10
5
AC CHARACTERISTICS
GND = 0V, t
R
= t
F
= 3.0ns, C
L
= 50pF, R
L
= 500
LIMITS
SYMBOL
PARAMETER
WAVEFORM
T
amb
= 25
C
V
CC
= 5.0V
T
amb
= 0 to + 70
C
V
CC
= Min to Max
UNIT
MIN
TYP
MAX
MIN
MAX
SR
B-Side Slew Rate
0.05
0.11
0.4
0.05
0.4
V/ns
t
PLH
t
PHL
Propagation delay
A toY or A to B
2
5.0
5.0
13.9
21.0
17.1
25.7
5.0
5.0
22
31
ns
t
PLH
t
PHL
Propagation delay
B to A
1
1.5
1.5
5.3
5.6
7.5
7.9
1.5
1.5
9.0
10.0
ns
t
PZH
t
PHZ
Output enable/disable time to/from High level
HD to Y or HD to B
3
4.0
2.0
12.0
6.5
16.0
9.1
4.0
2.0
20.0
11.0
ns
t
PZL
t
PLZ
Output enable/disable time to/from Low level
A to Y or A to B
4
5.0
1.5
12.7
5.0
16.3
7.1
5.0
1.5
20.0
9.0
ns
AC WAVEFORMS
For all waveforms, V
M
= 1.5V.
B
n
Input
V
M
t
PLH
t
PHL
A
1
A
4
Output
50% V
CC
V
M
V
OH
V
OL
50% V
CC
SK00003
Waveform 1.
Propagation Delay for Bn to A1A4
A
n
Input
V
M
t
PLH
t
PHL
B
n
or Y
n
Output
V
M
V
OH
1.4V
V
OH
V
OL
V
OH
1.4V
SK00004
Waveform 2.
Propagation Delay for An to Bn or Yn Outputs
HD Inputs
V
M
t
PZH
t
PHZ
0V
V
OH
0.3V
B
n
or Y
n
Output
V
M
V
M
V
OH
SK00005
Waveform 3.
3-State Output Enable Time to High Level and
Output Disable Time from High Level
A
n
Input
t
PZL
t
PLZ
V
OL
+0.3V
B
n
or Y
n
Output
V
M
V
M
V
M
V
OL
SK00006
Waveform 4.
3-State Output enable Time to Low Level and
Output disable Time from Low Level
PDF 
ZIP