Philips Semiconductors

Product specification

74ALS245A/74ALS245A-1

Octal transceiver (3-State)

2

1991 Jun 03

853–0011 02709

FEATURES

conditions

DESCRIPTION

The 74ALS245A is an octal transceiver featuring non-inverting

3-State bus compatible outputs in both transmit and receive

directions. The device features an output enable (OE) input for easy

cascading and transmit/receive (R/T) input for direction control.

The 74ALS245A-1 is the same as the 74ALS245A except that both

ports sink 48mA within the

TYPE

TYPICAL

PROPAGATION

DELAY

TYPICAL

SUPPLY CURRENT

(TOTAL)

74ALS245A

7.0ns

34mA

74ALS245A-1

7.0ns

34mA

PIN CONFIGURATION

SF00198

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

T/R

A0

A1

A2

A3

A4

A5

A6

A7

GND

OE

B0

B1

B2

B3

B4

B6

B5

B7

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

COMMERCIAL RANGE

DRAWING

NUMBER

20-pin plastic DIP

74ALS245AN,

74ALS245A-1N

SOT146-1

20-pin plastic SOL

74ALS245AD,

744ALS245A-1D

SOT163-1

20-pin plastic SSOP

Type II

74ALS245ADB,

74ALS245A-1DB

SOT339-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74ALS (U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

A0 – A7, B0 – B7

Data inputs

1.0/1.0

20

µA/0.1mA

OE

Output Enable input (active-Low)

1.0/1.0

20

µA/0.1mA

T/R

Transmit/receive input

1.0/1.0

20

µA/0.1mA

A0 – A7

A port outputs

750/240

15mA/24mA

B0 – B7

B port outputs

750/240

15mA/24mA

A0 – A7

A port outputs (-1 version)

750/480

15mA/48mA

B0 – B7

B port outputs (-1 version)

750/480

15mA/48mA

NOTE:

One (1.0) ALS unit load is defined as: 20

µA in the High state and 0.1mA in the Low state.