SN74HC245NSR

Product Overview

• Category: Integrated Circuit
• Use: Level Shifter and Bus Transceiver
• Characteristics: High-Speed, Non-Inverting, 3-State Outputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Transfers data between different voltage levels in digital systems
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage Levels: VCC or GND
• Output Voltage Levels: VCC or GND
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 9 ns (typical)
• Output Current: ±6 mA
• Input Capacitance: 3.5 pF
• Output Capacitance: 8 pF

Pin Configuration

The SN74HC245NSR has a total of 20 pins arranged as follows:

___________ | | 1 | 20 | VCC 2 | 19 | A1 3 | 18 | B1 4 | 17 | A2 5 | 16 | B2 6 | 15 | A3 7 | 14 | B3 8 | 13 | A4 9 | 12 | B4 10 | 11 | GND |___________|

Functional Features

• Bidirectional data transfer between two voltage domains
• Non-inverting logic levels
• 3-state outputs for bus sharing
• High-speed operation

Advantages and Disadvantages

Advantages: - Supports a wide range of supply voltages - Non-inverting logic simplifies system design - 3-state outputs allow multiple devices to share a bus - High-speed operation enables efficient data transfer

Disadvantages: - Limited output current capacity - Input and output capacitance may affect signal integrity in high-frequency applications

Working Principles

The SN74HC245NSR is a level shifter and bus transceiver integrated circuit. It allows bidirectional data transfer between two voltage domains, typically used in digital systems. The device operates by receiving input signals from one voltage domain and translating them to the corresponding logic levels of the other voltage domain. It features non-inverting logic, meaning that the output signals maintain the same logical state as the input signals.

The IC also includes 3-state outputs, which enable multiple devices to share a common bus. When the output enable (OE) pin is low, the outputs are active and can drive the bus lines. Conversely, when OE is high, the outputs enter a high-impedance state, allowing other devices to take control of the bus.

Detailed Application Field Plans

The SN74HC245NSR is commonly used in various applications, including:

1. Microcontroller interfacing: It facilitates communication between microcontrollers operating at different voltage levels.
2. Level shifting in mixed-voltage systems: It ensures compatibility between components with different voltage requirements.
3. Bus transceivers: It enables bidirectional data transfer between buses in multi-device systems.
4. Logic level conversion: It converts logic signals between different voltage standards, such as TTL and CMOS.

Detailed and Complete Alternative Models

Some alternative models to SN74HC245NSR include:

1. SN74HCT245N: Similar functionality with TTL-compatible inputs.
2. CD74HCT245E: High-speed CMOS logic level shifter.
3. 74LVC245APW: Low-voltage CMOS bus transceiver.

These alternative models offer similar features and can be used as replacements depending on specific requirements.

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