MC74LVX245DW データシートの表示（PDF） - Motorola => Freescale

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MC74LVX245DW

Octal Bus Transceiver With 5 V−Tolerant Inputs

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Octal Bus Transceiver

With 5V-Tolerant Inputs

The MC74LVX245 is an advanced high speed CMOS octal bus

transceiver.

It is intended for two–way asynchronous communication between data

buses. The direction of data transmission is determined by the level of the

T/R input. The output enable pin (OE) can be used to disable the device,

so that the buses are effectively isolated.

All inputs are equipped with protection circuits against static discharge.

• High Speed: tPD = 4.7ns (Typ) at VCC = 3.3V

• Low Power Dissipation: ICC = 4µA (Max) at TA = 25°C

• Power Down Protection Provided on Inputs

• Balanced Propagation Delays

• Low Noise: VOLP = 0.8V (Max)

• Pin and Function Compatible with Other Standard Logic Families

• Latchup Performance Exceeds 300mA

• ESD Performance: HBM > 2000V; Machine Model > 200V

APPLICATION NOTES

1. Do not force a signal on an I/O pin when it is an active output, damage may

occur.

2. All floating (high impedence) input or I/O pins must be fixed by means of

pull up or pull down resistors or bus terminator ICs.

3. A parasitic diode is formed between the bus and VCC terminals. Therefore,

the LVX245 cannot be used to interface 5V to 3V systems directly.

VCC OE B0 B1 B2 B3 B4 B5 B6 B7

20 19 18 17 16 15 14 13 12 11

MC74LVX245

LVX

LOW–VOLTAGE CMOS

DW SUFFIX

20–LEAD SOIC PACKAGE

CASE 751D–04

DT SUFFIX

20–LEAD TSSOP PACKAGE

CASE 948E–02

M SUFFIX

20–LEAD SOIC EIAJ PACKAGE

CASE 967–01

1 2 3 4 5 6 7 8 9 10

T/R A0 A1 A2 A3 A4 A5 A6 A7 GND

Figure 1. 20–Lead Pinout (Top View)

PIN NAMES

Pins

Function

OE

T/R

A0–A7

B0–B7

Output Enable Input

Transmit/Receive Input

Side A 3–State Inputs or 3–State

Outputs

Side B 3–State Inputs or 3–State

Outputs

6/97

© Motorola, Inc. 1997

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