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74HCT1284 Datasheet, PDF (3/12 Pages) NXP Semiconductors – Parallel printer interface transceiver/buffer
Philips Semiconductors
Parallel printer interface transceiver/buffer
Product specification
74HCT1284
LOGIC SYMBOL
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
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
H = High Voltage
L = Low Voltage
Z = High Impedance, Off-State
Inputs
B=A
ABSOLUTE MAXIMUM RATINGS1, 2
SYMBOL
PARAMETER
CONDITIONS
RATING
UNIT
VCC
DC supply voltage
–0.5 to +6.5
V
IIK
DC input diode current
VI < 0
±20
mA
VI
DC input voltage3
–2 to +7.0
V
IOK
DC output diode current
VO < 0
±50
mA
VOUT
DC output voltage3
Output in Off or High state
–0.5 to +5.5
V
IOUT
DC output current
Output in Low state
±50
mA
Tstg
Storage temperature range
–65 to 150
°C
ICC/IGND 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.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
VCC
VI
VIH
VIL
IOH
IOL
Tamb
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
LIMITS
MIN
MAX
4.7
5.5
0
VCC
2.0
0.8
–14
14
0
+70
UNIT
V
V
V
V
mA
mA
°C
1998 Jul 10
3