MC74LVX4245 Motorola, MC74LVX4245 Datasheet

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MC74LVX4245

Manufacturer Part Number
MC74LVX4245
Description
LOW-VOLTAGE CMOS
Manufacturer
Motorola
Datasheet

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DataSheet U .com
Dual Supply Octal
Translating Transceiver
with 3-State Outputs
that is designed to interface between a 5V bus and a 3V bus in a mixed
3V/5V supply environment such as laptop computers using a 3.3V CPU
and 5V LCD display. The A port interfaces with the 5V bus; the B port
interfaces with the 3V bus.
Transmit (active–High) enables data from the A port to the B port.
Receive (active–Low) enables data from the B port to the A port. The
Output Enable (OE) input, when High, disables both A and B ports by
placing them in 3–State.
7/97
4
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Motorola, Inc. 1997
Bi–directional Interface Between 5V and 3V Buses
Control Inputs Compatible with TTL Level
5V Data Flow at A Port and 3V Data Flow at B Port
Outputs Source/Sink 24mA at 5V Bus and 12mA at 3V Bus
Guaranteed Simultaneous Switching Noise Level and Dynamic
Threshold Performance
Available in SOIC and TSSOP Packages
Functionally Compatible with the 74 Series 245
The 74LVX4245 is a 24–pin dual–supply, octal translating transceiver
The Transmit/Receive (T/R) input determines the direction of data flow.
V CCB
V CCA T/R
24
1
V CCB OE
23
2
A0
22
3
B0
A1
21
Figure 1. 24–Lead Pinout
4
B1
20
A2
5
(Top View)
B2
A3
19
6
B3
A4
18
7
B4
A5
1
17
8
B5
A6
16
9
B6
A7
15
10
GND GND
B7
14
11
GND
13
12
PIN NAMES
Pins
OE
T/R
A0–A7
B0–B7
REV 2
MC74LVX4245
24–LEAD PLASTIC TSSOP PACKAGE
24–LEAD PLASTIC SOIC PACKAGE
LOW–VOLTAGE CMOS
LVX
Function
Output Enable Input
Transmit/Receive Input
Side A 3–State Inputs or 3–State
Outputs
Side B 3–State Inputs or 3–State
Outputs
CASE 751E–04
CASE 948H–01
DW SUFFIX
DT SUFFIX

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MC74LVX4245 Summary of contents

Page 1

... GND GND (Top View) 1 MC74LVX4245 LVX LOW–VOLTAGE CMOS DW SUFFIX 24–LEAD PLASTIC SOIC PACKAGE CASE 751E–04 DT SUFFIX 24–LEAD PLASTIC TSSOP PACKAGE CASE 948H–01 PIN NAMES Pins Function OE Output Enable Input T/R Transmit/Receive Input A0–A7 Side A 3– ...

Page 2

... MC74LVX4245 High Voltage Level Low Voltage Level High Impedance State High or Low Voltage Level and Transitions are Acceptable; For I CC reasons, Do Not Float Inputs MOTOROLA 4 DataSheet U .com Figure 2. Logic Diagram ...

Page 3

... I OUT = –100 A 4.5 3 –12mA 4.5 3 –8mA 4.5 2.7 I OUT = 100 A 4.5 3 24mA 4.5 3.0 I OUT = 100 A 4.5 3 12mA 4.5 3 8mA 4.5 2.7 3 MC74LVX4245 Value Condition –0 < GND < GND > 200 100 –65 to +150 300 Min Max 4.5 5.5 2.7 3 CCA CCA CCB – ...

Page 4

... MC74LVX4245 DC ELECTRICAL CHARACTERISTICS Symbol Parameter I IN Max Input Leakage Current I OZA Max 3–State Output Leakage I OZB Max 3–State Output Leakage I CC Maximum I CCT per Input I CCA Quiescent V CCA Supply Current I CCB Quiescent V CCB Supply Current V OLPA Quiet Output Max V OLPB ...

Page 5

... V CCA without the current penalty, but this “setup time” is dependent on the power–up ramp rate of the V CC pins. With a ramp rate of approximately 50mV/ns (50V 25ns setup time was observed (V CCB 5 MC74LVX4245 – 50pF 50pF V CCA = 5V 0.5V V CCB = 2 ...

Page 6

... LOGIC TRANSCEIVERS PCMCIA CONTROLLER VGA CONTROLLER Figure 4. MC74LVX4245 Fits Into a System with 3V Subsystem and 5V Subsystem Figure 5. MC74LVX4245 Pin Arrangement Is Compatible to 20–Pin 74 Series ‘245s MOTOROLA 4 DataSheet U .com note: if the V CCB ramp rate is faster than the V CCA ramp rate then power problems might still occur, even if the V CCA power– ...

Page 7

... DUT R T TEST t PLH , t PHL , t PZH , t PHZ t PZL , t PLZ 50pF or equivalent (Includes jig and probe capacitance 500 or equivalent OUT of pulse generator (typically 50 ) Figure 7. Test Circuit 7 MC74LVX4245 PHL CCA 50 – ...

Page 8

... MC74LVX4245 0.15 (0.006 0.15 (0.006 0.10 (0.004) –T– SEATING PLANE J1 J MOTOROLA 4 DataSheet U .com OUTLINE DIMENSIONS DT SUFFIX PLASTIC TSSOP PACKAGE CASE 948H–01 ISSUE O K 24X REF 0.10 (0.004 L/2 2X PIN 1 IDENT –V– DETAIL É ...

Page 9

... P 10.05 10.55 R 0.25 0.75 are registered trademarks of Motorola, Inc. Motorola, Inc Equal Mfax is a trademark of Motorola, Inc. INCHES MIN MAX 0.601 0.612 0.292 0.299 0.093 0.104 0.014 0.019 0.016 0.035 0.050 BSC 0.009 0.013 0.005 0.011 0 8 0.395 0.415 0.010 0.029 MC74LVX4245/D MOTOROLA ...

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