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74HCT1284 Arkusz danych(PDF) 2 Page - NXP Semiconductors

Numer części 74HCT1284
Szczegółowy opis  Parallel printer interface transceiver/buffer
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT1284 Arkusz danych(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74HCT1284
Parallel printer interface transceiver/buffer
2
1998 Jul 10
853–1768 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 VCC = 5.0V.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
Tamb = 25°C; GND = 0V
TYPICAL
UNIT
tPLH
tPHL
Propagation delay
Bn to An
CL = 50pF; VCC = 5V
5.3
5.6
ns
ns
CIN
Input capacitance An, DIR, HD
VI = 0V or VCC
5
pF
COUT
Output capacitance Bn, Yn
VO = 0V or VCC; 3-State
14
pF
ICC
Total supply current
VCC = 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
VCC
VCC
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
VCC
Positive supply voltage


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