Philips 74HCT1284PW, 74HCT1284DB, 74HCT1284D Datasheet

INTEGRATED CIRCUITS

74HCT1284

Parallel printer interface transceiver/buffer

Product specification
Supersedes data of 1995 Jun 27
IC06 Data Handbook

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1998 Jul 10

Philips Semiconductors Product specification

74HCT1284Parallel printer interface transceiver/buffer

FEA TURES

•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

& GND

CC

•IEEE 1284 Compliant Level 1 & 2

•Overvoltage Protection on B side

QUICK REFERENCE DATA

SYMBOL PARAMETER

C

t

PLH

t

PHL

C

I

IN
OUT
CC

Propagation delay
Bn to An

Input capacitance An, DIR, HD VI = 0V or V
Output capacitance Bn, Y

n

Total supply current VCC = 5.5V 500 nA

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

CONDITIONS

T

= 25°C; GND = 0V

amb

CL = 50pF; VCC = 5V

CC

TYPICAL UNIT

5.3

5.6
5 pF

VO = 0V or VCC; 3-State 14 pF

= 5.0V.

CC

ns
ns

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

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

PIN DESCRIPTION

PIN NUMBER SYMBOL FUNCTION

1,2,3,4

20,19,18,17

7,8,9

14,13,12

10,11

5,6 GND Ground (0V)

15,16 V

A1 - A4
B1 - B4

A5 - A7
Y5 - Y7

DIR,HIGH

DRIVE

CC

Data inputs/outputs

Buffer/Driver lines

Direction, Drive

Positive supply voltage

1998 Jul 10 853–1768 19693

2

Philips Semiconductors Product specification

SYMBOL

PARAMETER

UNIT

74HCT1284Parallel printer interface transceiver/buffer

LOGIC SYMBOL

AB

AB

B1A1

B2A2

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

AB

B3A3

L H L L A = B Inputs
L H H H A = B Inputs

AB

AY

AY

AY

DIR HD

ABSOLUTE MAXIMUM RATINGS

1, 2

SK00009

B4A4

H L L L Inputs Low Outputs Low
H L H Z Inputs High Outputs Z

Y5A5

Y6A6

Y7A7

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

SYMBOL PARAMETER CONDITIONS RATING UNIT

V

ICC/I

V

I
V

I

OK
OUT

I

OUT

T

CC
IK

stg

DC supply voltage –0.5 to +6.5 V
DC input diode current VI < 0 ±20 mA

I

DC input voltage

3

–2 to +7.0 V
DC output diode current VO < 0 ±50 mA
DC output voltage

3

Output in Off or High state –0.5 to +5.5 V
DC output current Output in Low state ±50 mA
Storage temperature range –65 to 150 °C
Continuous current through VCC or GND ±200 mA

GND

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

V

CC

V

V

V

I

OH

I

OL

T

amb

1998 Jul 10

DC supply voltage 4.7 5.5 V
Input voltage 0 V

I

High-level input voltage 2.0 V

IH

Low-level Input voltage 0.8 V

IL

High-level output current –14 mA
Low-level output current 14 mA
Operating free-air temperature range 0 +70 °C

LIMITS

MIN MAX

CC

V

3

Philips Semiconductors Product specification

A

out ut voltage

Low-level

n

74HCT1284Parallel printer interface transceiver/buffer

DC ELECTRICAL CHARACTERISTICS

LIMITS

T

SYMBOL PARAMETER TEST CONDITIONS

VCC = Min to Max; IOH = –50µA VCC–0.2 V

OH

High-level
output voltage

V

n

VCC = 4.7V; IOH = –4mA 4.3 4.6 3.7 V

Bn or YnVCC = 4.7V; IOH = –14mA 2.6 2.9 2.4 V

VCC = Min to Max; IOL = 50µA;
VI = VIL or V

A

V

OL

output voltage

n

VCC = 4.7V; IOL = 4mA; VI = VIL or V

IH

Bn or YnVCC = 4.7V; IOL = 14mA; VI = VIL or V

V

I

I

I

IIH+I

IIL+I

R

OFF

OZH

OZL

I

Input Hysteresis VCC = 5.0V 0.4 0.50 0.4 V

HYS

B/Y side Output

D

Impedance
Input leakage current

I

I

(A5–A7)
B/Y Side Power-off

leakage current
3-State output High

current Y

n

3-State output Low
current Y

current (A1 – A4, Bn) VCC = 5.5V; V

OZH

current (A1 – A4, Bn) VCC = 5.5V; V

OZL

Quiescent Supply

CC

Current

n

See Figure 1 8 15 22 8 22 Ω

VCC = 5.5V; VO = VCC or GND ±0.5 ±1.0 ±5.0 µA

VCC = 0.0V; VO = 0 to 7V ±1 ±10 ±100 µA

VCC = 5.5V; VO = VCC; VI = VIL or V

VCC = 5.5V; VO = GND; VI = VIL or V

= V

I/O

CC

= GND –1 –5 –25 µA

I/O

VCC = 5.5V; IO = 0; VI = GND or V

CC

= 25°C T

amb

MIN TYP MAX MIN MAX

CC

0 0.2 0.2 V

IH

IH

IH

IH

0.1 0.25 0.4 V

0.15 0.3 0.4 V

1 5 20 µA

–1 –5 –20 µA

1 5 25 µA

0.5 250 400 µA

= 0°C to +70°C

amb

UNIT

VCC–0.2 V

1998 Jul 10

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