Philips Semiconductors

Product specification

74F245

Octal transceiver (3-State)

2

November 15, 1994

853–0025 14256

FEATURES

conditions

DESCRIPTION

The 74F245 is an octal transceiver featuring non-inverting 3-State

bus compatible outputs in both transmit and receive directions. The

B port outputs are capable of sinking 64mA and sourcing 15mA,

producing very good capacitive drive characteristics. The device

features an Output Enable (OE) input for easy cascading and

Transmit/Receive (T/R) input for direction control. The 3-State

outputs, B0–B7, have been designed to prevent output bus loading if

the power is removed from the device.

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

TYPE

TYPICAL PROPAGATION DELAY

TYPICAL SUPPLY CURRENT (TOTAL)

74F245

4.0ns

70mA

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

DRAWING NUMBER

20-Pin Plastic DIP

N74F245N

SOT146-1

20-Pin Plastic SO

N74F245D

SOT163-1

20-Pin Plastic SSOP Type II

N74F245DB

SOT339-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F (U.L.) HIGH/LOW

LOAD VALUE HIGH/LOW

A0–A7, B0–B7

Data inputs

3.5/1.0

70

µA/0.6mA

OE

Output Enable input (active Low)

1.0/2.0

20

µA/1.2mA

T/R

Transmit/Receive input

1.0/2.0

20

µA/1.2mA

A0–A7

A port outputs

150/40

3.0mA/24mA

B0–B7

B port outputs

750/106.7

15mA/64mA

NOTE: One (1.0) FAST unit load is defined as: 20

µA in the High state and 0.6mA in the Low state.

LOGIC SYMBOL

B2

B3

B4

B5

16

15

14

13

23

4

GND = Pin 10

SF00199

B1

17

B0

18

19

1

OE

T/R

A0

A1

A2

A3

A4

A5

56

7

B6

B7

12

11

A6

A7

89

IEC/IEEE SYMBOL

SF00200

G3

19

3EN1 (BA)

1

3EN1 (AB)

∇ 1

2

∇

2

3

4

5

6

7

8

9

18

17

16

15

14

13

12

11