Series:	74LVT
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	Buffer, Non-Inverting
Number of Elements:	2
Number of Bits per Element:	4
Input Type:	--
Output Type:	3-State
Current - Output High, Low:	12mA, 12mA
Voltage - Supply:	2.7 V ~ 3.6 V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	20-SO
Base Part Number:	74LVT2244

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Logic - Buffers, Drivers, Receivers, Transceivers

Introduction

The 74LVT2244D,118 is a dual level-shifting 8-bit bus transceiver designed to support automotive applications. It combines two 3-state 8-bit buffer/drivers, with a 2-bit logic level-shifters.

Application Field

The 15 V tolerant inputs offer flexibility of mixed voltage busses on a single chip. The 74LVT2244D,118 is ideal for automotive applications, where mixed-voltage buses are the norm and higher-speed operation is required. It is used in I2C, SPI, and RS-232 communication systems, as well as motor control and analog data acquisition. This device is a smart, low-power solution for interfacing 5V and 15V systems.

Features and Benefits

• Level-shift bidirectional, 8-bit bus transceiver with separate input and output enable inputs.
• High-drive 3-state output buffers for bus-oriented applications.
• I/O in low-voltage, 5V and 15V logic.
• At 5V logic level, the logic levels are TTL compatible.
• Compact packages save board space.
• Allow mixed-voltage busses on a single chip.
• Low-power consumption.
• CMOS input and output logic levels.
• Excellent ESD performance.
• High capacitive load drive.

Working Principle

The level shift portion of the 74LVT2244D,118 is used to shift a signal from one voltage level to another. The device takes a 5V input signal, and converts it to a 15V level. This allows the transceiver to be used in systems with both 5V and 15V logic levels. The levelshift is performed by a pair of NOR gates, which output a voltage level that is the sum of the two inputs. The direction control logic is a multiplexer with an enable input, which allows it to be used for either input or output. The 74LVT2244D,118 has two 3-state buffers/drivers, with separate Enable/Disable inputs. When the output enables (E1,E2) are enabled, the output will take the value of the data inputs (D1-D8). When the output enables (E1,E2) are disabled, the output will be in a high impedance state. This allows the transceiver to be used in multi-drop systems, where the data can be shared amongst multiple devices.

Conclusion

The 74LVT2244D,118 is a useful 8-bit bus transceiver for applications that require level shifting. Its 15V tolerant inputs and 3-state drivers make it an ideal solution for automotive or mixed voltage systems where low power and reliability are of paramount importance. With its wide range of features and benefits, the 74LVT2244D,118 is an excellent choice for any application requiring a level shifting interface.

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