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Product Detailed Parameters
- Description：IC GATE NAND 4CH 2-INP 14SOIC
- Series：74ALS
- Mfr：Texas Instruments
- Package：Bulk,Tube
- 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 SN74ALS38BD 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 range of 0°C to 70°C. The device features a propagation delay of 10 ns (min) to 33 ns (max) at VCC = 5V with CL = 50 pF. Low-level output current capability reaches up to 24 mA. It is housed in a 14-pin Small Outline Integrated Circuit (SOIC) package.
Feature Summary
- Contains four independent 2-input NAND buffers with open-collector outputs requiring external pull-up 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 configurations
- Generating higher output voltage levels via external pull-ups
- Active-high wired-AND bus structures
Procurement Notes
Verify the specific ordering suffix against the Package Option Addendum to confirm the exact package type and production status. The SN74ALS38BD designation corresponds to the SOIC package. Confirm RoHS compliance and moisture sensitivity level ratings prior to procurement to ensure compatibility with assembly processes.
Selection Notes
Select this component when open-collector NAND functionality is required for wired-logic applications. Ensure the design includes appropriate external pull-up resistors, as internal pull-ups are not present. Verify that the 24 mA low-level sink current meets the load requirements of the driven circuitry.
Part Context
This part belongs to the SN54/74ALS38B family of quadruple 2-input positive-NAND buffers with open-collector outputs. The 'SN' prefix indicates commercial grade operation, while 'ALS' denotes Advanced Low-power Schottky logic technology. The 'D' suffix specifies the plastic small-outline package variant.
Replacement Considerations
SN74ALS38BDR
FAQ
Why are external components necessary for this device?
The open-collector outputs require external pull-up resistors to perform correctly and establish a high logic state.
What Boolean function does this IC implement?
It performs the Boolean function Y = A • B or Y = A + B in positive logic.
