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Product Detailed Parameters
- Description：IC GATE NAND 4CH 2-INP 14SOIC
- Series：74ALS
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT),Bulk
- Logic Type：NAND Gate
- Number of Circuits：4
- Number of Inputs：2
- Features：Open Collector
- Voltage - Supply：4.5V ~ 5.5V
- Current - Quiescent (Max)：-
- Current - Output High, Low：-, 24mA
- Input Logic Level - Low：0.8V
- Input Logic Level - High：2V
- Max Propagation Delay @ V, Max CL：33ns @ 5V, 50pF
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Surface Mount
- Supplier Device Package：14-SOIC
- Package / Case：14-SOIC (0.154", 3.90mm Width)
- Grade：-
- Qualification：-
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Overview
The SN74ALS38BDR is a quadruple 2-input positive-NAND buffer with open-collector outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature from 0°C to 70°C. The device features a propagation delay of 10 ns minimum to 33 ns maximum at VCC = 4.5 V to 5.5 V, with a low-level output current capability of up to 24 mA. It is housed in a 14-pin Small Outline (D) package.
Feature Summary
- Contains four independent 2-input NAND buffers with open-collector outputs requiring external pullup resistors for correct operation.
- Outputs can be connected to other open-collector outputs to implement active-low wired-OR or active-high wired-AND functions.
- Designed to generate higher VOH levels suitable for interfacing with different logic families.
Applications
- Implementing active-low wired-OR logic functions
- Implementing active-high wired-AND logic functions
- Generating higher high-level output voltage (VOH) levels
Procurement Notes
Verify the specific ordering suffix 'DR' corresponds to the SOIC-14 tape and reel packaging configuration. Confirm that the component meets RoHS compliance standards as indicated in the manufacturer's documentation. Ensure the selected part aligns with the required commercial temperature range specifications for your application environment.
Selection Notes
Select this component when multiple independent NAND gates are required in a compact surface-mount footprint. Consider the open-collector nature of the outputs, which necessitates external pullup resistors to define the high logic state. Evaluate the 24 mA low-level sink current capability against the load requirements of the driven circuitry.
Part Context
This device belongs to the SN74ALS38B family of quadruple 2-input positive-NAND buffers. It is distinct from the SN54ALS38B, which is characterized for the full military temperature range of -55°C to 125°C. The SN74ALS38B is specifically rated for the commercial temperature range of 0°C to 70°C.
Replacement Considerations
SN74ALS38BN
FAQ
Why are external pullup resistors required for the SN74ALS38BDR?
The device features open-collector outputs, which cannot actively drive the output high. External pullup resistors are necessary to establish the high logic level and allow the outputs to function correctly.
What logic functions can be implemented using the open-collector outputs?
By connecting multiple open-collector outputs together, the device can implement active-low wired-OR or active-high wired-AND functions.
