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4-bit Dual-Supply Bus Transceivers Supporting a Minimum Voltage of 0.8V
In recent years, due to the demand for high functionality in LSI, such as microcontrollers and CPUs, the process of System on Chip (SoC) has been miniaturized, and the operating voltage has been reduced. In contrast, peripheral devices often continue to use existing power supply systems, resulting in mismatches in signal voltage levels during data communication. Level shifters are used to compensate for the potential difference in signal lines that occurs during this communication.
Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched three products of dual-supply bus transceivers as level shifters to accommodate the low voltage requirements of these power systems. The three products are "74AVC4T245FT", "74AVCH4T245FT" and "74AVC4T345FT". Toshiba’s existing product[1] has a minimum voltage of 1.1V, whereas new products have optimized the process to support level shifting from 0.8V.
The "74AVC4T245FT" is a 4-bit product equipped with four bidirectional level shift circuits, allowing for direction control every 2-bits. The "74AVCH4T245FT" is similar and has a built-in bus-hold function in the input/output terminals, making it usable even when the input terminals are in a high-impedance state. These two products can be applied to UART[2] communication and more. The "74AVC4T345FT" can control direction with 3bits and 1bit. It can be applied in SPI[3] communication and other uses.
All three products help save power in devices due to their low static current consumption (ICCA, ICCB = 8μA (max)) [4]. In addition, users can customize the input and output power supply voltage within the range of 0.8 to 3.6V. The power-on/off sequence can also be set flexibly, simplifying power management of two power supply systems.
Three-state circuit is adopted for the output stage of the new products. The output stage can be set to high impedance by either connecting one of the power terminals to GND or by controlling the OE terminal input. Furthermore, the signal direction can be determined by the DIR pin, which is used for switching the transmission direction. The new products support an operating temperature range of -40°C to 125°C and adopt the TSSOP16B package.
Toshiba will continue to meet user needs by releasing products that support a variety of communication protocols.
Part number |
Functions |
Applications (Communication protocol) |
|---|---|---|
2-bit×2 control (Improved usability by separating 4 bits into 2-bit directions) |
UART etc. |
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2-bit×2 control, with bus hold function that retains the previous state even without signal |
UART etc. |
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3-bit+1-bit control (for high-speed data) |
SPI etc. |
Product configuration diagram
Notes:
[1] TC7MP3125FT
[2] UART (Universal Asynchronous Receiver/Transmitter), an asynchronous serial communication transceiver circuit.
Protocol for asynchronous data transmission
[3] SPI (Serial Peripheral Interface), synchronous serial communication. Protocol for synchronizing and transmitting data
[4] Fix the input terminals to the power supply terminals or 0V, Ta=85°C.
Features
- Low voltage operation from 0.8V that supports a wide variety of voltage systems
- Supports UART and SPI communication
- No restrictions on the power-on/off sequence of the power supply terminals VCCA and VCCB
Features Explanation
1. Low voltage operation from 0.8V that supports a wide variety of voltage systems
The 74AVC Series supports a variety of voltage systems and enables bidirectional communication by supporting signal voltages from 0.8V to 3.6V. The power supply voltage can be set arbitrarily by users, and communication for both level-up and level-down is possible from either power supply voltage.
2. Supports UART and SPI communication
For directly level-shifting UART method (4-line) signals, the 74AVC4T245, which allows independent control of the signal direction every 2 bits, and the 74AVCH4T245, which adds a bus hold function to control these signals, are available. Additionally, for level-shifting SPI method signals, the 74AVC4T345, which enables 3-bit and 1-bit communication control, is available.
3. No restrictions on the power-on/off sequence of the power supply terminals VCCA and VCCB
In electronic devices, the power-on/off sequence is determined by the system. However, in Toshiba’s existing products, this sequence may not match the system, requiring consideration of the power-on sequence. In these products, the restriction on the power-on/off sequence of the power terminals VCCA and VCCB has been eliminated, simplifying the power management of systems.
Applications
Industrial Equipment
- Servers in datacenters, communication equipment, etc.
Consumer Equipment
- Tablets, MFPs, etc.
Main Specifications
Part number |
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Package |
Name |
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Size (mm) |
5.0×6.4 (typ.), t=1.2 (max) |
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Operating ranges |
Supply voltage VCCA, VCCB (V) |
0.8 to 3.6 |
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Output current IOUTA, IOUTB (mA) |
VCCA, VCCB =3.0 to 3.6V |
±12 |
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Operating temperature Topr (°C) |
-40 to 125 |
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DC characteristics (Unless otherwise specified, Ta=-40 to 85°C) |
High-level input voltage VIHA (V) |
nA, nDIR, nOE |
VCCA, VCCB =3.0 to 3.6V |
Min |
2.0 |
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High-level input voltage VIHB (V) |
nB |
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Low-level input voltage VILA (V) |
nA, nDIR, nOE |
Max |
0.9 |
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Low-level input voltage VILB (V) |
nB |
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Quiescent supply current ICCA, ICCB (μA) |
Max |
8 |
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AC characteristics (Ta=-40 to 85°C) |
Propagation delay time A to B tPLH/tPHL (ns) |
VCCA, VCCB =3.0 to 3.6V |
Max |
3.3 |
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Propagation delay time B to A tPLH/tPHL (ns) |
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Sample check & availability |
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Related link
Follow the links below for more on the new product.
Follow the link below for more on Toshiba’s level shifters.
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