74LVC1284 Ver la hoja de datos (PDF) - Philips Electronics
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74LVC1284 Datasheet PDF : 10 Pages
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Philips Semiconductors
3.3V Parallel printer interface transceiver/buffer
Product specification
74LVC1284
FEATURES
• 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 VCC & GND
• IEEE 1284 Compliant Level 1 & 2
• Overvoltage Protection on B side
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 VCC = 3.3V.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
RD
SR
ICC
VHYS
tPLH/tPHL
A –B/Y
B/Y Side output resistance
B/Y Side slew rate
Total static current
Input hysteresis
Propagation delay
to the B/Y side outputs
CONDITIONS
Tamb = 25°C; GND = 0V
VCC = 3.3V; VO = 1.65V "0.2V (See Figure 2)
RL = 62Ω; CL = 50pF (See Waveform 4)
VI = VCC/GND; IO = 0
VCC= 3.3V
VCC = 3.3V
TYPICAL
45
0.2
5
0.4
12.6/12.4
UNIT
Ω
V/ns
µA
V
ns
ORDERING INFORMATION
PACKAGES
20-pin plastic SO
20-pin plastic SSOP Type II
20-pin plastic TSSOP Type I
PIN CONFIGURATION
TEMPERATURE RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
ORDER CODE
7LVC1284 D
74LVC1284 DB
74LVC1284 PW
LOGIC SYMBOL
DRAWING NUMBER
SOT163-1
SOT339-1
SOT360-1
A1 1
A2 2
A3 3
A4 4
GND 5
GND 6
A5 7
A6 8
A7 9
DIR 10
20 B1
19 B2
18 B3
17 B4
16 VCC
15 VCC
14 Y5
13 Y6
12 Y7
11 HD
SK00001
A1
A
B
A2
A3
A
B
A4
A5
A6
A7
DIR
A
B
B1
B2
A
B
B3
B4
A
Y
Y5
A
Y
Y6
A
Y
Y7
HD
SK00009
1995 Nov 10
2
853-1819 16000
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