IDT74LVC245APYG

Product Overview

• Category: Integrated Circuit (IC)
• Use: Level Shifter/Transceiver
• Characteristics: Bi-directional, 8-bit, voltage level translation
• Package: 20-pin TSSOP (Thin Shrink Small Outline Package)
• Essence: Transfers data between different voltage domains
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.2V to 3.6V
• High-level Input Voltage: 2.0V to VCC + 0.5V
• Low-level Input Voltage: -0.5V to 0.8V
• High-level Output Voltage: VCC - 0.4V
• Low-level Output Voltage: 0.4V
• Maximum Input Current: ±10mA
• Maximum Output Current: ±32mA
• Propagation Delay: 3.7ns (typical)

Pin Configuration

The IDT74LVC245APYG has a total of 20 pins, which are assigned as follows:

1. OE (Output Enable) - Output control pin
2. A1 - Data input/output pin 1
3. B1 - Data input/output pin 2
4. A2 - Data input/output pin 3
5. B2 - Data input/output pin 4
6. A3 - Data input/output pin 5
7. B3 - Data input/output pin 6
8. A4 - Data input/output pin 7
9. B4 - Data input/output pin 8
10. GND (Ground) - Ground reference
11. B5 - Data input/output pin 9
12. A5 - Data input/output pin 10
13. B6 - Data input/output pin 11
14. A6 - Data input/output pin 12
15. B7 - Data input/output pin 13
16. A7 - Data input/output pin 14
17. B8 - Data input/output pin 15
18. A8 - Data input/output pin 16
19. VCC (Supply Voltage) - Positive supply voltage
20. DIR (Direction Control) - Direction control pin

Functional Features

• Bi-directional data transfer between two voltage domains
• Supports voltage level translation from 1.2V to 3.6V
• Output enable pin for controlling the direction of data flow
• High-speed operation with low propagation delay
• ESD protection on all inputs and outputs
• Compatible with TTL, CMOS, and LVCMOS logic levels

Advantages and Disadvantages

Advantages: - Enables seamless communication between different voltage domains - Provides reliable and efficient level shifting capabilities - Offers high-speed data transfer with low propagation delay - ESD protection ensures robustness against electrostatic discharge

Disadvantages: - Limited to 8-bit data transfer - Requires careful consideration of voltage compatibility between input and output domains

Working Principles

The IDT74LVC245APYG is a bidirectional level shifter/transceiver that allows data transfer between two voltage domains. It operates by translating the logic levels of the input signals to match the voltage requirements of the output signals. The direction of data flow is controlled by the output enable (OE) and direction control (DIR) pins.

When OE is low, the device is enabled, and data can be transferred bidirectionally between the input and output pins. When OE is high, the outputs are in a high-impedance state, effectively disconnecting them from the bus.

The DIR pin determines the direction of data flow. When DIR is low, data is transferred from the A-side to the B-side. Conversely, when DIR is high, data is transferred from the B-side to the A-side.

Detailed Application Field Plans

The IDT74LVC245APYG is commonly used in various applications that require voltage level translation between different logic families or voltage domains. Some of the typical application fields include:

1. Microcontroller interfacing: The IC facilitates communication between microcontrollers operating at different voltage levels.
2. Bus-level translation: It enables data transfer between buses with different voltage requirements, such as I2C, SPI, or UART.
3. Mixed-voltage systems: The IC allows integration of components operating at different voltage levels within a single system.
4. Battery-powered devices: It helps interface low-power components with higher voltage domains, extending battery life.

Detailed and Complete Alternative Models

1. SN74LVC245APW: Similar 8-bit bidirectional level shifter/transceiver by Texas Instruments.
2. MC74LVX245DTG: 20-pin TSSOP package level translator by ON Semiconductor.
3. CD74HCT245