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74F245

Octal transceiver (3-State)

Philips Electronics 

Philips Semiconductors

Octal transceiver (3-State)

Product specification

74F245

FEATURES

• Octal bidirectional bus interface

• 3-State buffer outputs sink 64mA

• 15mA source current

• Outputs are placed in high impedance state during power-off

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

T/R 1

A0 2

A1 3

A2 4

A3 5

A4 6

A5 7

A6 8

A7 9

GND 10

20 VCC

19 OE

18 B0

17 B1

16 B2

15 B3

14 B4

13 B5

12 B6

11 B7

SF00198

TYPE

74F245

TYPICAL PROPAGATION DELAY

4.0ns

TYPICAL SUPPLY CURRENT (TOTAL)

70mA

ORDERING INFORMATION

DESCRIPTION

20-Pin Plastic DIP

20-Pin Plastic SO

20-Pin Plastic SSOP Type II

COMMERCIAL RANGE

VCC = 5V ±10%, Tamb = 0°C to +70°C

N74F245N

N74F245D

N74F245DB

DRAWING NUMBER

SOT146-1

SOT163-1

SOT339-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F (U.L.) HIGH/LOW

A0–A7, B0–B7

Data inputs

3.5/1.0

OE

Output Enable input (active Low)

1.0/2.0

T/R

Transmit/Receive input

1.0/2.0

A0–A7

A port outputs

150/40

B0–B7

B port outputs

750/106.7

NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.

LOAD VALUE HIGH/LOW

70µA/0.6mA

20µA/1.2mA

20µA/1.2mA

3.0mA/24mA

15mA/64mA

LOGIC SYMBOL

234567 89

IEC/IEEE SYMBOL

19

G3

3EN1 (BA)

1

3EN1 (AB)

A0 A1 A2 A3 A4 A5 A6 A7

19

OE

1

T/R

B0 B1 B2 B3 B4 B5 B6 B7

VCC = Pin 20

GND = Pin 10

18 17 16 15 14 13 12 11

SF00199

∇1

2

2∇

18

3

17

4

16

5

15

6

14

7

13

8

12

9

11

SF00200

November 15, 1994

2

853–0025 14256

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