DM74ALS645AN

Description：IC TXRX NON-INVERT 5.5V 20DIP
Series：74ALS
Mfr：onsemi
Package：Tube

SKU:c26a81484606 Category: Buffers, Drivers, Receivers, Transceivers Brand: onsemi

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Product introduction

Product Detailed Parameters

Description：IC TXRX NON-INVERT 5.5V 20DIP
Series：74ALS
Mfr：onsemi
Package：Tube
Logic Type：Transceiver, Non-Inverting
Number of Elements：1
Number of Bits per Element：8
Input Type：-
Output Type：3-State
Current - Output High, Low：15mA, 24mA
Voltage - Supply：4.5V ~ 5.5V
Operating Temperature：0°C ~ 70°C (TA)
Mounting Type：Through Hole
Package / Case：20-DIP (0.300", 7.62mm)
Supplier Device Package：20-PDIP
Grade：-
Qualification：-

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DM74ALS645AN

Overview

The DM74ALS645AN is an octal bus transceiver manufactured by onsemi, utilizing the Advanced Oxide-isolated Ion-implanted Schottky TTL process. It operates within a supply voltage range of 4.5V to 5.5V and supports bidirectional data transmission between two buses controlled by DIR and G inputs. The device features a 20-Lead Plastic Dual-In-Line Package (PDIP). Key electrical parameters include a propagation delay of 31ns maximum, output drive currents of -15mA high and 24mA low, and operation across a temperature range of 0°C to +70°C.

Feature Summary

Advanced Oxide-isolated Ion-implanted Schottky TTL process for optimized switching performance
Bidirectional data transmission capability controlled by direction and enable inputs
PNP input design reduces input loading on driving circuits

Applications

Asynchronous two-way communication between data busses
Memory systems interfacing
Microprocessor system data routing

Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm package type matches the required 20-Lead PDIP specification. Check datasheet revisions to ensure compatibility with current design requirements. Validate operating conditions against specific application constraints before integration.

Selection Notes

Select this component for applications requiring robust bidirectional data transfer in asynchronous environments. Ensure the design accommodates the specified 4.5V to 5.5V supply voltage range. Consider the 20-Lead PDIP package dimensions for PCB layout planning. Verify that the load capacitance does not exceed the guaranteed switching performance limits defined in the datasheet.

Part Context

This device belongs to the 74ALS logic family, known for advanced low-power Schottky characteristics. It serves as a standard interface solution for connecting microprocessors to memory or peripheral devices. The octal configuration allows for efficient handling of wide data buses in digital systems.