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MC74VHC245

更新时间： 2024-11-19 23:05:47
品牌 Logo 应用领域
安森美 - ONSEMI 总线收发器
页数 文件大小 规格书
7页 179K
描述
Octal Bus Transceiver

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中文翻译

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MC74VHC245 数据手册

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SEMICONDUCTOR TECHNICAL DATA  
The MC74VHC245 is an advanced high speed CMOS octal bus  
transceiver fabricated with silicon gate CMOS technology. It achieves high  
speed operation similar to equivalent Bipolar Schottky TTL while maintaining  
CMOS low power dissipation.  
It is intended for two–way asynchronous communication between data  
buses. The direction of data transmission is determined by the level of the  
DIR input. The output enable pin (OE) can be used to disable the device, so  
that the buses are effectively isolated.  
DW SUFFIX  
20–LEAD SOIC PACKAGE  
CASE 751D–04  
All inputs are equipped with protection circuits against static discharge.  
•
•
•
•
•
•
•
•
•
•
•
High Speed: t  
= 4.0ns (Typ) at V  
= 5V  
PD  
Low Power Dissipation: I  
CC  
= 4µA (Max) at T = 25°C  
CC  
A
High Noise Immunity: V  
Power Down Protection Provided on Inputs  
Balanced Propagation Delays  
Designed for 2V to 5.5V Operating Range  
= V  
= 28% V  
NIH  
NIL CC  
DT SUFFIX  
20–LEAD TSSOP PACKAGE  
CASE 948E–02  
Low Noise: V  
= 1.2V (Max)  
OLP  
Pin and Function Compatible with Other Standard Logic Families  
Latchup Performance Exceeds 300mA  
ESD Performance: HBM > 2000V; Machine Model > 200V  
Chip Complexity: 308 FETs or 77 Equivalent Gates  
M SUFFIX  
20–LEAD SOIC EIAJ PACKAGE  
CASE 967–01  
APPLICATION NOTES  
ORDERING INFORMATION  
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.  
MC74VHCXXXDW  
MC74VHCXXXDT  
MC74VHCXXXM  
SOIC  
TSSOP  
SOIC EIAJ  
3. AparasiticdiodeisformedbetweenthebusandV  
terminals. Therefore,  
CC  
the VHC245 cannot be used to interface 5V to 3V systems directly.  
PIN ASSIGNMENT  
LOGIC DIAGRAM  
2
3
4
5
6
7
8
9
18  
17  
16  
15  
14  
13  
12  
11  
DIR  
1
20  
V
CC  
A1  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
B1  
B2  
B3  
B4  
B5  
B6  
B7  
B8  
A1  
A2  
2
3
19  
18  
OE  
B1  
A
DATA  
PORT  
B
A3  
4
17  
B2  
DATA  
PORT  
A4  
A5  
5
16  
15  
14  
13  
12  
11  
B3  
B4  
B5  
B6  
B7  
B8  
6
A6  
7
A7  
8
1
DIR  
OE  
A8  
9
19  
GND  
10  
FUNCTION TABLE  
Control Inputs  
Operation  
OE  
L
DIR  
L
Data Transmitted from Bus B to Bus A  
Data Transmitted from Bus A to Bus B  
Buses Isolated (High–Impedance State)  
L
H
H
X
6/97  
Motorola, Inc. 1997  
REV 1  
1234567

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