參數(shù)資料
型號： 74HCT1284
廠商： NXP Semiconductors N.V.
英文描述： 8-Line To 1-Line Data Selectors/Multiplexers 16-TSSOP -40 to 85
中文描述： 并行打印機接口的收發(fā)器/緩沖器
文件頁數(shù)： 2/12頁
文件大?。?/td> 138K
代理商： 74HCT1284
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 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
相關PDF資料
PDF描述
74HCT1284D 8-Line To 1-Line Data Selectors/Multiplexers 16-TSSOP -40 to 85
74HCT1284DB Parallel printer interface transceiver/buffer
74HCT1284N 8-Line To 1-Line Data Selectors/Multiplexers 16-TSSOP -40 to 85
74HCT1284PW 8-Line To 1-Line Data Selectors/Multiplexers 16-TSSOP -40 to 85
74HCT138 3-to-8 line decoder/demultiplexer; inverting
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