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Product Detailed Parameters
- Description：IC OCT BUS XCVR TRI-ST 20-DIP
- Series：-
- Mfr：Texas Instruments
- Package：Tube
- Logic Type：-
- Number of Elements：-
- Number of Bits per Element：-
- Input Type：-
- Output Type：-
- Current - Output High, Low：-
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：-
- Mounting Type：Through Hole
- Package / Case：20-DIP (0.300", 7.62mm)
- Supplier Device Package：20-PDIP
- Grade：-
- Qualification：-
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Overview
The SN74ALS1640AN is an octal bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin plastic DIP package. It provides asynchronous two-way communication between data buses with 3-state outputs and inverting logic. The device operates on a supply voltage ranging from 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C.
Feature Summary
- Provides asynchronous bidirectional data transmission between A and B buses controlled by a direction input
- Features 3-state outputs that allow effective bus isolation when disabled
- Incorporates inverting logic for signal processing
Applications
- Asynchronous two-way communication between data buses
- I/O port expansion systems
- Memory-to-memory or memory-to-I/O transfers
Procurement Notes
Verify the specific ordering suffix 'N' confirms the standard plastic DIP-20 package configuration. Confirm RoHS compliance status and lead finish details against current manufacturer documentation. Ensure the component meets the required 0°C to 70°C operating temperature range for your application environment.
Selection Notes
Select this component for applications requiring octal-width bidirectional data transfer with inverting logic characteristics. Compare propagation delay specifications against system timing requirements. Evaluate the 3-state output capability for proper bus management and isolation needs within the circuit design.
Part Context
This device belongs to the SN74ALS1640A/1645A series of octal bus transceivers. It serves as a lower-power alternative to the SN74ALS640B and SN74ALS645A devices. The SN74ALS1640A specifically features inverting logic, distinguishing it from the non-inverting SN74ALS1645A variant.
Replacement Considerations
SN74ALS1645AN (Non-inverting equivalent)
FAQ
What is the logic type of the SN74ALS1640AN?
The SN74ALS1640AN features inverting logic.
How does the device control data flow direction?
Data flow direction is determined by the level at the direction-control (DIR) input.
