74F2245 查看數據表（PDF） - Philips Electronics

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74F2245

Octal transceiver with 30
equivalent output termination (3-State)

Philips Electronics 

Philips Semiconductors

Octal transceiver with 30W equivalent output termination

(3-State)

Product specification

74F2245

FEATURES

• Octal bidirectional bus interface

• 30 Ohm output termination for driving DRAM

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

conditions

• SSOP Type II package

DESCRIPTION

The 74F2245 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 (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.

The 30 Ohm series termination on the outputs reduces

over/undershoot making them ideal for driving DRAM.

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

74F2245

TYPICAL PROPAGATION DELAY

4.0ns

TYPICAL SUPPLY CURRENT (TOTAL)

70mA

ORDERING INFORMATION

DESCRIPTION

20-Pin Plastic DIP

20-Pin Plastic SOL

20-Pin Plastic SSOP

COMMERCIAL RANGE

VCC = 5V ±10%, Tamb = 0°C to +70°C

N74F2245N

N74F2245D

N74F2245DB

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

150/8

B0-B7

B port outputs

150/8

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

*

12mA with reduced noise margin

LOAD VALUE HIGH/LOW

70µA/0.6mA

20µA/1.2mA

20µA/1.2mA

3.0mA/5mA*

3.0mA/5mA*

1996 May 10

2

853-1833 16802

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