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Product Detailed Parameters
- Description：IC GATE NOR 4CH 2-INP 14DIP
- Series：74ALS
- Mfr：Texas Instruments
- Package：Tube,Tube
- Logic Type：NOR 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：Through Hole
- Supplier Device Package：14-PDIP
- Package / Case：14-DIP (0.300", 7.62mm)
- Grade：-
- Qualification：-
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Overview
The SN74ALS33AN is a Texas Instruments logic gate featuring four independent 2-input positive-NOR buffers with open-collector outputs. It operates within a supply voltage range of 4.5 V to 5.5 V and supports low-level output currents up to 24 mA. The device exhibits propagation delays ranging from 10 ns to 33 ns for high-to-low transitions and 2 ns to 12 ns for low-to-high transitions under standard test conditions. Designed for commercial applications, it functions reliably across an operating temperature range of 0°C to 70°C.
Feature Summary
- Features four independent 2-input positive-NOR buffer gates
- Utilizes open-collector outputs requiring external resistive pull-up networks
- Supports wired-AND configurations for flexible bus architectures
Applications
- Wired-AND logic implementations in digital circuits
- Interface buffering for systems requiring higher voltage levels
- General-purpose NOR logic operations in industrial control systems
Procurement Notes
Verify the specific package suffix 'N' corresponds to the standard plastic DIP configuration before ordering. Confirm that the application design includes appropriate external pull-up resistors, as the open-collector outputs cannot drive high states independently. Ensure the operating environment remains within the specified commercial temperature limits.
Selection Notes
Select this component when a quad 2-input NOR function with open-collector capability is required. It is suitable for designs needing wired-AND functionality or interfacing between different voltage domains. Consider the ALS series characteristics for moderate speed and power consumption requirements compared to standard TTL alternatives.
Part Context
This part belongs to the Texas Instruments SN74ALS family of advanced small-scale integration logic devices. The 'N' suffix indicates a standard plastic dual in-line package (PDIP). It serves as the commercial-grade counterpart to the military-rated SN54ALS33A, sharing identical logical functions but differing in temperature specifications.
Replacement Considerations
SN54ALS33AJ
FAQ
Why are external resistors required for this component?
The SN74ALS33AN utilizes open-collector outputs, which lack internal circuitry to drive the output high. External pull-up resistors are mandatory to establish a valid high logic level.
What is the maximum low-level output current?
The datasheet specifies a maximum low-level output current (IOL) of 24 mA at a supply voltage of 4.5 V.
