Philips Semiconductors

Product specification

74HCT1284

Parallel printer interface transceiver/buffer

2

1998 Jul 10

853–1768 19693

FEATURES

and 200V per Machine Model

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

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

Propagation delay

Bn to An

5.3

5.6

ns

ns

5

pF

14

pF

Total supply current

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

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

Positive supply voltage