MC74VHC245 Motorola, MC74VHC245 Datasheet

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MC74VHC245

Manufacturer Part Number
MC74VHC245
Description
Octal Bus Transceiver
Manufacturer
Motorola
Datasheet

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Octal Bus Transceiver
transceiver fabricated with silicon gate CMOS technology. It achieves high
speed operation similar to equivalent Bipolar Schottky TTL while maintaining
CMOS low power dissipation.
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.
APPLICATION NOTES
1. Do not force a signal on an I/O pin when it is an active output, damage may
2. All floating (high impedence) input or I/O pins must be fixed by means of
3. A parasitic diode is formed between the bus and V CC terminals. Therefore,
6/97
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Motorola, Inc. 1997
The MC74VHC245 is an advanced high speed CMOS octal bus
It is intended for two–way asynchronous communication between data
All inputs are equipped with protection circuits against static discharge.
High Speed: t PD = 4.0ns (Typ) at V CC = 5V
Low Power Dissipation: I CC = 4 A (Max) at T A = 25 C
High Noise Immunity: V NIH = V NIL = 28% V CC
Power Down Protection Provided on Inputs
Balanced Propagation Delays
Designed for 2V to 5.5V Operating Range
Low Noise: V OLP = 1.2V (Max)
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
occur.
pull up or pull down resistors or bus terminator ICs.
the VHC245 cannot be used to interface 5V to 3V systems directly.
PORT
DATA
OE
Control Inputs
A
H
L
L
DIR
OE
A1
A2
A3
A4
A5
A6
A7
A8
2
3
4
5
6
7
8
9
1
19
DIR
H
X
L
FUNCTION TABLE
LOGIC DIAGRAM
Data Transmitted from Bus B to Bus A
Data Transmitted from Bus A to Bus B
Buses Isolated (High–Impedance State)
1
O
Operation
i
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
B
DATA
PORT
REV 1
MC74VHC245
MC74VHCXXXDW
MC74VHCXXXDT
MC74VHCXXXM
20–LEAD SOIC EIAJ PACKAGE
20–LEAD TSSOP PACKAGE
ORDERING INFORMATION
20–LEAD SOIC PACKAGE
GND
DIR
A4
A1
A2
A3
A5
A6
A7
A8
PIN ASSIGNMENT
CASE 751D–04
CASE 948E–02
CASE 967–01
DW SUFFIX
DT SUFFIX
1
2
3
4
5
6
7
8
9
10
M SUFFIX
20
19
18
17
16
15
14
13
12
11
SOIC
TSSOP
SOIC EIAJ
V CC
OE
B1
B2
B3
B4
B5
B6
B7
B8

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MC74VHC245 Summary of contents

Page 1

... MOTOROLA SEMICONDUCTOR TECHNICAL DATA Octal Bus Transceiver 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 intended for two–way asynchronous communication between data buses ...

Page 2

... MC74VHC245 Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î MAXIMUM RATINGS* Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î ...

Page 3

... Parameter P 3 MC74VHC245 Î Î Î Î Î Î Î Î Î Î Î – Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î ...

Page 4

... MC74VHC245 50% t PLH 50 Figure 1. TEST POINT OUTPUT DEVICE UNDER TEST * Includes all probe and jig capacitance Figure 3. MOTOROLA SWITCHING WAVEFORMS DIR OE 50 GND 50 PHL 50 TEST CIRCUITS TEST POINT ...

Page 5

... INPUT EQUIVALENT CIRCUIT DIR, OE INPUT VHC Data – Advanced CMOS Logic DL203 — Rev 1 EXPANDED LOGIC DIAGRAM BUS TERMINAL EQUIVALENT CIRCUIT A, B I/O 5 MC74VHC245 MOTOROLA ...

Page 6

... MC74VHC245 –A– –B– 10X 20X 0.010 (0.25 18X K K 20X 0.10 (0.004) 0.15 (0.006 L PIN 1 IDENT 1 0.15 (0.006 –V– 0.100 (0.004) –T– SEATING PLANE MOTOROLA OUTLINE DIMENSIONS DW SUFFIX PLASTIC SOIC PACKAGE CASE 751D– ...

Page 7

... D 12.35 12.80 0.486 0.504 E 5.10 5.45 0.201 0.215 e 1.27 BSC 0.050 BSC H E 7.40 8.20 0.291 0.323 L 0.50 0.85 0.020 0.033 L E 1.10 1.50 0.043 0.059 0.70 0.90 0.028 0.035 Z ––– 0.81 ––– 0.032 Mfax is a trademark of Motorola, Inc. MC74VHC245/D MOTOROLA ...

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