Overview
The CD74HC245M96 is a high-speed CMOS logic octal-bus transceiver produced by Texas Instruments. This device is designed for two-way asynchronous communication between data buses and is part of the HC and HCT series, known for their high-speed operation and low power consumption. The CD74HC245M96 allows data transmission from the A bus to the B bus or vice versa, controlled by the direction (DIR) and output enable (OE) pins. It is available in a SOIC (DW) package, making it suitable for a variety of applications requiring high-speed data transfer and bus driving capabilities.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC Supply Voltage | 2 | 6 | V | ||
| VI Input Voltage | 0 | VCC | V | ||
| VO Output Voltage | 0 | VCC | V | ||
| TA Operating Temperature | -55 | 125 | °C | ||
| tpd Propagation Delay (A to B, B to A) | VCC = 5V, CL = 15pF, TA = 25°C | 9 | ns | ||
| tdis Output Disable to Output | VCC = 5V, CL = 50pF | 30 | 38 | 45 | ns |
| ten Output Enable to Output | VCC = 5V, CL = 50pF | 30 | 38 | 45 | ns |
| tt Output Transition Time | VCC = 5V, CL = 50pF | 12 | 15 | 18 | ns |
| Ci Input Capacitance | 10 | pF | |||
| Cio Three-state Output Capacitance | 20 | pF |
Key Features
- Buffered inputs and three-state outputs
- Bus line driving capability
- Typical propagation delay of 9ns at VCC = 5V, CL = 15pF, TA = 25°C
- Fanout: 15 LSTTL loads
- Wide operating temperature range: -55°C to 125°C
- Balanced propagation delay and transition times
- Significant power reduction compared to LSTTL logic ICs
- HC types: 2 V to 6 V operation, high noise immunity
- HCT types: 4.5 V to 5.5 V operation, direct LSTTL input logic compatibility
Applications
- Two-way asynchronous communication between data buses
- High-speed data transfer in digital systems
- Bus driving in microprocessor and memory systems
- Industrial control systems requiring high-speed and low power consumption
- Automotive and aerospace applications due to the wide operating temperature range
Q & A
- What is the primary function of the CD74HC245M96?
The CD74HC245M96 is an octal-bus transceiver designed for two-way asynchronous communication between data buses.
- What are the operating voltage ranges for the HC and HCT types?
HC types operate from 2 V to 6 V, while HCT types operate from 4.5 V to 5.5 V.
- What is the typical propagation delay of the CD74HC245M96?
The typical propagation delay is 9ns at VCC = 5V, CL = 15pF, and TA = 25°C.
- What is the fanout capability of the CD74HC245M96?
The device can drive up to 15 LSTTL loads.
- What is the operating temperature range of the CD74HC245M96?
The device operates over a temperature range of -55°C to 125°C.
- How do the direction (DIR) and output enable (OE) pins control the data flow?
The DIR pin determines the direction of data flow (A to B or B to A), and the OE pin puts the I/O ports in the high-impedance state when high.
- What are the key differences between HC and HCT types?
HC types operate over a wider voltage range (2 V to 6 V) with high noise immunity, while HCT types are designed for direct LSTTL input logic compatibility and operate between 4.5 V and 5.5 V.
- What is the significance of the three-state output feature?
The three-state output feature allows the outputs to be in a high-impedance state, which is useful for bus applications where multiple devices may be connected.
- How does the CD74HC245M96 reduce power consumption compared to LSTTL logic ICs?
The device reduces power consumption significantly due to its CMOS design, while maintaining speeds and drive capabilities comparable to LSTTL circuits.
- What are some common applications of the CD74HC245M96?
Common applications include high-speed data transfer in digital systems, bus driving in microprocessor and memory systems, and industrial control systems.
