INTEGRATED CIRCUITS
74HCT1284
Parallel printer interface transceiver/buffer
Product specification
Supersedes data of 1995 Jun 27
IC06 Data Handbook
1998 Jul 10
Philips
Semiconductors
Philips Semiconductors
Product specification
Parallel printer interface transceiver/buffer
74HCT1284
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
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.
•
Input Hysteresis
•
Low Noise Operation
•
Center Pin V
CC
& GND
•
IEEE 1284 Compliant Level 1 & 2
•
Overvoltage Protection on B side
QUICK REFERENCE DATA
SYMBOL
t
PLH
t
PHL
C
IN
C
OUT
I
CC
PARAMETER
Propagation delay
Bn to An
Input capacitance A
n
, DIR, HD
Output capacitance B
n
, Y
n
Total supply current
CONDITIONS
T
amb
= 25°C; GND = 0V
C
L
= 50pF; V
CC
= 5V
V
I
= 0V or V
CC
V
O
= 0V or V
CC
; 3-State
V
CC
= 5.5V
TYPICAL
5.3
5.6
5
14
500
UNIT
ns
ns
pF
pF
nA
ORDERING INFORMATION
PACKAGES
20-pin plastic DIP
20-pin plastic SOL
20-pin plastic SSOP Type II
20-pin plastic TSSOP Type I
TEMPERATURE RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
ORDER CODE
74HCT1284N
7HCT1284D
74HCT1284DB
74HCT1284PW
DRAWING NUMBER
SOT146-1
SOT163-1
SOT339-1
SOT360-1
PIN CONFIGURATION
A1 1
A2
A3
A4
GND
GND
A5
A6
A7
2
3
4
5
6
7
8
9
20 B1
19 B2
18 B3
17 B4
16 V
CC
15 V
CC
14 Y5
13 Y6
12 Y7
11 HD
PIN DESCRIPTION
PIN NUMBER
1,2,3,4
20,19,18,17
7,8,9
14,13,12
10,11
5,6
15,16
SYMBOL
A1 - A4
B1 - B4
A5 - A7
Y5 - Y7
DIR,HIGH
DRIVE
GND
V
CC
FUNCTION
Data inputs/outputs
Buffer/Driver lines
Direction, Drive
Ground (0V)
Positive supply voltage
DIR 10
SK00001
1998 Jul 10
2
853–1768 19693
Philips Semiconductors
Product specification
Parallel printer interface transceiver/buffer
74HCT1284
LOGIC SYMBOL
A1
A
B
B1
FUNCTION TABLE
INPUTS
DIR
L
B2
OUTPUTS
A5-7
L
H
L
H
L
H
L
H
Y5-7
L
Z
L
H
L
Z
L
H
INPUTS/OUTPUTS
A1-4
A=B
A=B
A=B
A=B
Inputs Low
Inputs High
Inputs
Inputs
B1-4
Inputs
Inputs
Inputs
Inputs
Outputs Low
Outputs Z
B=A
B=A
HD
L
L
H
H
L
L
H
H
A2
A
B
L
A3
A
B
B3
L
L
A4
A
B
B4
H
H
A5
A6
A7
DIR
A
A
A
Y
Y
Y
Y5
Y6
Y7
HD
H
H
H = High Voltage
L = Low Voltage
Z = High Impedance, Off-State
SK00009
ABSOLUTE MAXIMUM RATINGS
1, 2
SYMBOL
V
CC
I
IK
V
I
I
OK
V
OUT
I
OUT
T
stg
I
CC
/I
GND
DC supply voltage
DC input diode current
DC input voltage
3
DC output diode current
DC output voltage
3
DC output current
Storage temperature range
Continuous current through V
CC
or GND
V
O
< 0
Output in Off or High state
Output in Low state
V
I
< 0
PARAMETER
CONDITIONS
RATING
–0.5 to +6.5
±20
–2 to +7.0
±50
–0.5 to +5.5
±50
–65 to 150
±200
UNIT
V
mA
V
mA
V
mA
°C
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
LIMITS
SYMBOL
V
CC
V
I
V
IH
V
IL
I
OH
I
OL
T
amb
DC supply voltage
Input voltage
High-level input voltage
Low-level Input voltage
High-level output current
Low-level output current
Operating free-air temperature range
0
PARAMETER
MIN
4.7
0
2.0
0.8
–14
14
+70
MAX
5.5
V
CC
V
V
V
V
mA
mA
°C
UNIT
1998 Jul 10
3
Philips Semiconductors
Product specification
Parallel printer interface transceiver/buffer
74HCT1284
DC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
High-level
out ut
output voltage
A
n
B
n
or Y
n
A
n
B
n
or Y
n
V
HYS
R
D
I
I
I
OFF
I
OZH
I
OZL
I
IH
+I
OZH
I
IL
+I
OZL
I
CC
Input Hysteresis
B/Y side Output
Impedance
Input leakage current
(A5–A7)
B/Y Side Power-off
leakage current
3-State output High
current Y
n
3-State output Low
current Y
n
current
(
A
1
– A
4
, B
n
)
current
(
A
1
– A
4
, B
n
)
Quiescent Supply
Current
V
CC
= Min to Max; I
OH
= –50µA
V
CC
= 4.7V; I
OH
= –4mA
V
CC
= 4.7V; I
OH
= –14mA
V
CC
= Min to Max; I
OL
= 50µA;
V
I
= V
IL
or V
IH
V
CC
= 4.7V; I
OL
= 4mA; V
I
= V
IL
or V
IH
V
CC
= 4.7V; I
OL
= 14mA; V
I
= V
IL
or V
IH
V
CC
= 5.0V
See Figure 1
V
CC
= 5.5V; V
O
= V
CC
or GND
V
CC
= 0.0V; V
O
= 0 to 7V
V
CC
= 5.5V; V
O
= V
CC
; V
I
= V
IL
or V
IH
V
CC
= 5.5V; V
O
= GND; V
I
= V
IL
or V
IH
V
CC
= 5.5V; V
I/O
= V
CC
V
CC
= 5.5V; V
I/O
= GND
V
CC
= 5.5V; I
O
= 0; V
I
= GND or V
CC
0.4
8
V
CC
–0.2
4.3
2.6
T
amb
= 25°C
TYP
V
CC
4.6
2.9
0
0.1
0.15
0.50
15
±0.5
±1
1
–1
1
–1
0.5
22
±1.0
±10
5
–5
5
–5
250
0.2
0.25
0.3
0.4
8
22
±5.0
±100
20
–20
25
–25
400
MAX
T
amb
= 0°C to +70°C
MIN
V
CC
–0.2
3.7
2.4
0.2
0.4
0.4
MAX
V
V
V
V
V
V
V
Ω
µA
µA
µA
µA
µA
µA
µA
UNIT
V
OH
V
OL
Low-level
output voltage
1998 Jul 10
4
Philips Semiconductors
Product specification
Parallel printer interface transceiver/buffer
74HCT1284
AC CHARACTERISTICS
GND = 0V, t
R
= t
F
= 3.0ns, C
L
= 50pF, R
L
= 500Ω
LIMITS
SYMBOL
PARAMETER
WAVEFORM
MIN
SR
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PHZ
t
PZL
t
PLZ
B-Side Slew Rate
Propagation delay
A toY or A to B
Propagation delay
B to A
Output enable/disable time to/from High level
HD to Y or HD to B
Output enable/disable time to/from Low level
A to Y or A to B
2
1
3
4
0.05
5.0
5.0
1.5
1.5
4.0
2.0
5.0
1.5
T
amb
= 25°C
V
CC
= 5.0V
TYP
0.11
13.9
21.0
5.3
5.6
12.0
6.5
12.7
5.0
MAX
0.4
17.1
25.7
7.5
7.9
16.0
9.1
16.3
7.1
T
amb
= 0 to + 70°C
V
CC
= Min to Max
MIN
0.05
5.0
5.0
1.5
1.5
4.0
2.0
5.0
1.5
MAX
0.4
22
31
9.0
10.0
20.0
11.0
20.0
9.0
V/ns
ns
ns
ns
ns
UNIT
AC WAVEFORMS
For all waveforms, V
M
= 1.5V.
B
n
Input
V
M
V
M
A
n
Input
t
PHL
V
OH
V
M
V
M
t
PLH
t
PLH
t
PHL
V
OH
A
1
– A
4
Output
50% V
CC
50% V
CC
V
OL
B
n
or Y
n
Output
V
OH
–1.4V
V
OH
–1.4V
V
OL
SK00003
SK00004
Waveform 1. Propagation Delay for Bn to A1–A4
Waveform 2. Propagation Delay for An to Bn or Yn Outputs
HD Inputs
V
M
t
PZH
V
M
t
PHZ
V
OH
A
n
Input
V
M
V
M
t
PZL
t
PLZ
B
n
or Y
n
Output
V
M
V
OH
–0.3V
0V
B
n
or Y
n
Output
V
M
V
OL
+0.3V
V
OL
SK00005
SK00006
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
Waveform 4. 3-State Output enable Time to Low Level and
Output disable Time from Low Level
1998 Jul 10
5
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