Philips 74lvc1284 DATASHEETS
INTEGRATED CIRCUITS
74LVC1284
3.3V Parallel printer interface
transceiver/buffer
Product specification 1995 Nov 10
IC24 Low Voltage Handbook
Philips Semiconductors Product specification
74L VC12843.3V Parallel printer interface transceiver/buffer
FEA TURES
•Asynchronous operation
•4-Bit transceivers
•3 additional buffer/driver lines
•TTL compatible inputs
•ESD protection exceeds 1000V per MIL STD 883 Method 3015
and 200V per Machine Model
•Input Hysteresis
•Low Noise Operation
•Center Pin V
& GND
CC
DESCRIPTION
The 74LVC1284 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 300mV of input hysteresis at V
•IEEE 1284 Compliant Level 1 & 2
•Overvoltage Protection on B side
QUICK REFERENCE DATA
SYMBOL PARAMETER
R
D
B/Y Side output resistance VCC = 3.3V; VO = 1.65V 0.2V (See Figure 2) 45 Ω
SR B/Y Side slew rate RL = 62Ω; CL = 50pF (See Waveform 4) 0.2 V/ns
I
CC
V
HYS
t
PLH/tPHL
A –B/Y
Total static current VI = VCC/GND; IO = 0 5 µA
Input hysteresis VCC= 3.3V 0.4 V
Propagation delay
to the B/Y side outputs
CONDITIONS
T
= 25°C; GND = 0V
amb
TYPICAL UNIT
VCC = 3.3V 12.6/12.4 ns
= 3.3V.
CC
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE ORDER CODE DRAWING NUMBER
20-pin plastic SO 0°C to +70°C 7LVC1284 D SOT163-1
20-pin plastic SSOP Type II 0°C to +70°C 74LVC1284 DB SOT339-1
20-pin plastic TSSOP Type I 0°C to +70°C 74LVC1284 PW SOT360-1
PIN CONFIGURATION
1
A1
2
A2
3
A3
4
A4
5
GND
6
GND
7
A5
8
A6
9
A7
10 11
DIR
SK00001
B1
20
19
B2
18
B3
17
B4
16
V
CC
15
V
CC
14
Y5
13
Y6
12
Y7
HD
LOGIC SYMBOL
AB
AB
AB
AB
AY
AY
AY
DIR HD
SK00009
B1A1
B2A2
B3A3
B4A4
Y5A5
Y6A6
Y7A7
1995 Nov 10 853-1819 16000
2
Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
74LVC12843.3V Parallel printer interface transceiver/buffer
PIN DESCRIPTION
PIN NUMBER SYMBOL FUNCTION
1,2,3,4 A1 - A4 Data inputs/outputs
20,19,18,17 B1 - B4
7,8,9 A5 - A7 Data inputs
14,13,12 Y5 - Y7 IEEE 1284 Std. outputs
10 DIR Direction selection
11 HD
5,6 GND Ground (0V)
15,16 V
CC
IEEE 1284 Std.
outputs/inputs
B/Y–side high drive
enable/disable
Positive supply voltage
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
SYMBOL
1, 2
PARAMETER CONDITIONS RATING UNIT
ESD Immunity, per Mil Std 883C method 3015 2 kV
V
CC
I
IK
I
OK
V
IN
V
B/Y
OUT
V
B/Y (tr) Transient output voltage on B/Y side
OUT
V
A side DC output voltage on A side –0.5 to V
OUT
I
O
T
stg
ICC/I
GND
DC supply voltage –0.5 to +4.6 V
DC input diode current VI < 0 20 mA
DC output diode current VO < 0 50 mA
DC input voltage
DC output voltage on B/Y side
DC
3
3
4
40ns transient –2 to +7 V
–0.5 to +5.5 V
–0.5 to +5.5 V
+0.5 V
CC
DC output current Outputs in High or Low state 50 mA
Storage temperature range –60 to +150 °C
Continuous current through VCC 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.
4. V
B/Y (tr) guarantees only that this part will not be damaged by reflections in application so long as the voltage levels remain in the
OUT
specified range.
RECOMMENDED OPERATING CONDITIONS
V
CC
V
V
OUT
V
OUT
I
OH
I
OL
T
amb
1995 Nov 10
DC supply voltage 3.0 3.6 V
Input voltage 0 V
I
B/Y output voltage –0.5 5.5 V
A side output voltage 0 V
B/Y side output current High –14 mA
B/Y side output current Low 14 mA
Operating free-air temperature range 0 +70 °C
LIMITS
MIN MAX
CC
CC
V
V
3
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