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74F1245

Octal transceiver (3-State)

Philips Electronics 

Philips Semiconductors

Octal transceiver (3-State)

Product specification

74F1245

FEATURES

• Same function and pinout as 74F245

• High impedance NPN base inputs for reduced loading (70µA in

Low and High states)

• Useful in applications where light loading bus loading or direct

interface with output of a MOS microprocessor is desired

• Octal bidirectional bus interface

• Glitch free during 3-State power up and power down

• 3-State buffer outputs sink 64mA and source 15mA

TYPE

74F1245

TYPICAL

PROPAGATION

DELAY

5.0ns

TYPICAL SUPPLY

CURRENT (TOTAL)

115mA

DESCRIPTION

The 74F1245 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 up to

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.

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

20-Pin Plastic DIP

N74F1245N

20-Pin Plastic SOL

N74F1245D

DRAWING

NUMBER

SOT146-1

SOT163-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F (U.L.) HIGH/LOW

A0–A7, B0–B7

A and B port inputs

3.5/0.117

OE

Output Enable input (active Low)

2.0/0.033

T/R

Transmit/Receive input

2.0/0.033

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/70µA

40µA/20µA

40µA/20µA

3.0mA/24mA

15mA/64mA

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

LOGIC SYMBOL

234567 89

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

1995 Mar 01

2

853-0885 14921

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