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Product Detailed Parameters
- Description：IC GATE NAND 4CH 2-INP 14SO
- 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-SO
- Package / Case：14-SOIC (0.209", 5.30mm Width)
- Grade：-
- Qualification：-
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Overview
The SN74ALS38BNSR is a quadruple 2-input positive-NAND buffer with open-collector outputs from the Texas Instruments ALS logic family. 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 (max) at tPLH and 1 ns (max) at tPHL under standard load conditions. Low-level output current capability reaches 24 mA, while high-level output current is limited to 0.1 mA due to the open-collector architecture.
Feature Summary
- Contains four independent 2-input NAND buffers with open-collector outputs requiring external pull-up resistors for proper operation.
- Outputs can be connected together to implement active-low wired-OR or active-high wired-AND functions.
- Designed to generate higher output voltage levels than standard TTL by utilizing external pull-up sources.
Applications
- Implementing wired-logic bus structures using open-collector interconnects.
- Driving loads that require voltage levels exceeding standard logic supply voltages.
- General-purpose digital buffering in industrial control systems.
Procurement Notes
Verify the specific ordering suffix 'SR' corresponds to the SOP (NS) package with 2000 units per large tape and reel configuration. Confirm RoHS compliance status and lead finish details via the latest TI Package Option Addendum. Ensure the procurement source provides valid traceability documentation consistent with production data standards.
Selection Notes
Select this component when open-collector outputs are required for wired-AND/OR logic implementation or level shifting beyond standard VCC limits. The ALS series offers faster switching speeds compared to standard LS logic while maintaining lower power consumption. Verify that the application circuit includes appropriate pull-up resistors to define the high-state output voltage.
Part Context
This part belongs to the SN54/74ALS38B family of quadruple 2-input positive-NAND buffers. The SN74 variant is rated for commercial temperatures (0°C to 70°C), whereas the SN54 version supports military specifications (-55°C to 125°C). The device utilizes bipolar technology within the Advanced Low-Power Schottky logic family.
Replacement Considerations
SN74ALS38BD
FAQ
Why are external pull-up resistors required for this device?
The SN74ALS38BNSR features open-collector outputs which lack an internal transistor to pull the output high. External pull-up resistors are necessary to establish the high logic state and determine the maximum output voltage level.
Can multiple SN74ALS38BNSR outputs be connected together?
Yes, open-collector outputs may be connected to other open-collector outputs to implement active-low wired-OR or active-high wired-AND functions without causing electrical conflicts.
