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PDF MC74LVX4245 Data sheet ( Hoja de datos )
| Número de pieza | MC74LVX4245 | |
| Descripción | Dual Supply Octal Translating Transceiver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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MC74LVX4245
Dual Supply Octal
Translating Transceiver
with 3−State Outputs
The 74LVX4245 is a 24−pin dual−supply, octal translating
transceiver that is designed to interface between a 5.0 V bus and a 3.0 V
bus in a mixed 3.0 V / 5.0 V supply environment such as laptop
computers using a 3.3 V CPU and 5.0 V LCD display. The A port
interfaces with the 5V bus; the B port interfaces with the 3.0 V bus.
The Transmit/Receive (T/R) input determines the direction of data
flow. 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.
Features
• Bi−directional Interface Between 5.0 V and 3.0 V Buses
• Control Inputs Compatible with TTL Level
• 5.0 V Data Flow at A Port and 3.0 V Data Flow at B Port
• Outputs Source/Sink 24 mA at 5.0 V Bus and 12 mA at 3.0 V Bus
• Guaranteed Simultaneous Switching Noise Level and Dynamic
Threshold Performance
• Available in SOIC and TSSOP Packages
• Functionally Compatible with the 74 Series 245
• Pb−Free Packages are Available*
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VCCB VCCB OE B0 B1 B2 B3 B4 B5 B6 B7 GND
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12
VCCA T/R A0 A1 A2 A3 A4 A5 A6 A7 GND GND
Figure 1. 24−Lead Pinout
(Top View)
http://onsemi.com
MARKING
DIAGRAMS
24
1
24
1
24
SOIC−24
DW SUFFIX
CASE 751E
LVX
4245
AWLYYWW
1
TSSOP−24
DT SUFFIX
CASE 948H
24
LVXC4245
AWLYYWW
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
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
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
March, 2005 − Rev. 4
1
Publication Order Number:
MC74LVX4245/D
1 page  
MC74LVX4245
AC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
TA = −40 to +85°C
CL = 50pF
VCCA = 5V ±0.5V
VCCB = 3.3V ±0.3V
Typ
Min (Note 4) Max
TA = −40 to +85°C
CL = 50pF
VCCA = 5V ±0.5V
VCCB = 2.7V
Min Max
Unit
tPHL Propagation Delay A to B
tPLH
1.0 5.1 9.0 1.0 10.0 ns
1.0 5.3 9.0 1.0 10.0
tPHL Propagation Delay B to A
tPLH
1.0 5.4 9.0 1.0 10.0 ns
1.0 5.5 9.0 1.0 10.0
tPZL
tPZH
Output Enable Time OE to B
1.0 6.5 10.5 1.0 11.5 ns
1.0 6.7 10.5 1.0 11.5
tPZL
tPZH
Output Enable Time OE to A
1.0 5.2 9.5 1.0 10.0 ns
1.0 5.8 9.5 1.0 10.0
tPHZ
tPLZ
Output Disable Time OE to B
1.0 6.0 10.0 1.0 10.0 ns
1.0 3.3 7.0 1.0 7.5
tPHZ
tPLZ
Output Disable Time OE to A
1.0 3.9 7.5 1.0 7.5 ns
1.0 2.9 7.0 1.0 7.5
tOSHL
tOSLH
Output to Output Skew, Data to Output (Note 5)
1.0 1.5
1.5 ns
4. Typical values at VCCA = 5.0V; VCCB = 3.3V at 25°C.
5. Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device.
The specification applies to any outputs switching in the same direction, either HIGH−to−LOW (tOSHL) or LOW−to−HIGH (tOSLH); parameter
guaranteed by design.
ORDERING INFORMATION
Device
Package
Shipping†
MC74LVX4245DW
SOIC−24
30 Units / Rail
MC74LVX4245DWR2
SOIC−24
1000 Tape & Reel
MC74LVX4245DWR2G
SOIC−24
(Pb−Free)
1000 Tape & Reel
MC74LVX4245DT
TSSOP−24*
62 Units / Rail
MC74LVX4245DTR2
TSSOP−24*
2500 Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*This package is inherently Pb−Free.
http://onsemi.com
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