Philips Semiconductors

Product specification

74LVC1284

3.3V Parallel printer interface transceiver/buffer

2

1995 Nov 10

853-1819 16000

FEATURES

and 200V per Machine Model

DESCRIPTION

The 74LVC1284 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

B/Y Side output resistance

45

Ω

SR

B/Y Side slew rate

0.2

V/ns

Total static current

5

µA

Input hysteresis

0.4

V

A –B/Y

Propagation delay

to the B/Y side outputs

12.6/12.4

ns

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DRAWING NUMBER

20-pin plastic SO

0

°C to +70°C

7LVC1284 D

SOT163-1

20-pin plastic SSOP Type II

0

°C to +70°C

74LVC1284 DB

SOT339-1

20-pin plastic TSSOP Type I

0

°C to +70°C

74LVC1284 PW

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

LOGIC SYMBOL

DIR

HD

Y7

A7

AY

Y6

A6

AY

Y5

A5

AY

B4

A4

AB

AB

B2

A2

AB

AB

B3

A3

B1

A1

SK00009