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Product Detailed Parameters
- Description：IC GATE NAND 4CH 2-INP 14-SO
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Logic Type：-
- Number of Circuits：-
- Number of Inputs：-
- Features：-
- Voltage - Supply：-
- Current - Quiescent (Max)：-
- Current - Output High, Low：-
- Input Logic Level - Low：-
- Input Logic Level - High：-
- Max Propagation Delay @ V, Max CL：-
- Operating Temperature：-
- Mounting Type：-
- Supplier Device Package：-
- Package / Case：-
- Grade：-
- Qualification：-
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Overview
The SN74ALS38BNS 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 low-level output currents up to 24 mA and high-level output currents up to 0.1 mA. Propagation delays are specified between 10 ns and 33 ns for tPLH, and 1 ns to 12 ns for tPHL under standard load conditions.
Feature Summary
- Contains four independent 2-input NAND buffers
- Features open-collector outputs requiring external pull-up resistors
- Supports active-low wired-OR or active-high wired-AND logic functions
Applications
- Implementing active-low wired-OR logic configurations
- Generating higher output voltage levels via external pull-ups
- General-purpose digital buffering in TTL-compatible systems
Procurement Notes
Verify the specific ordering suffix 'NS' corresponds to the Small Outline Package (SOP) variant when sourcing. Confirm RoHS compliance status and lead finish details against the latest manufacturer package addendum. Ensure procurement channels provide valid traceability documentation for production-grade components.
Selection Notes
Select this component when open-collector NAND functionality is required for bus sharing or voltage level shifting. Verify that the application circuit includes appropriate pull-up resistors to define the high logic state. Consider the ALS series speed-power trade-offs relative to other logic families if performance requirements change.
Part Context
This part belongs to the SN74ALS38B family of quadruple 2-input NAND buffers. It is the commercial grade version characterized for operation from 0°C to 70°C, distinct from the military grade SN54ALS38B which covers -55°C to 125°C. The 'NS' suffix specifically denotes the plastic small outline package configuration.
Replacement Considerations
SN74ALS38BN
FAQ
Why are external pull-up resistors necessary?
The outputs are open-collector type, meaning they can only sink current to ground. A pull-up resistor is required to source current and establish the high logic state.
What logic function does this device perform?
It performs the Boolean function Y = A · B (NAND) for each of its four independent gates.
