ChipApex | Global Electronic Components Supplier
SEARCH
Search Product
Search Post
— IC芯片 | 连接器 | 传感器 | 被动器件 —
Consult the customer manager about the wholesale price.
consultation hotline：86-132-6715-2157
email：[email protected]
Contact the product manager for consultation. One-stop consultation is available.
Do you want a lower wholesale price? Please send us your inquiry and we will reply immediately.
Product Detailed Parameters
- Description：IC GATE NOR 4CH 2-INP 14SOIC
- Series：74ALS
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Bulk
- 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：Surface Mount
- Supplier Device Package：14-SOIC
- Package / Case：14-SOIC (0.154", 3.90mm Width)
- Grade：-
- Qualification：-
Download product information
Overview
The SN74ALS33ADR is a Texas Instruments logic gate containing 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 an operating temperature from 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 2 ns to 12 ns for tPHL under standard load conditions.
Feature Summary
- Contains four independent 2-input positive-NOR buffers
- Features open-collector outputs requiring resistive pullup
- Supports wired-AND applications for higher VOH levels
Applications
- Wired-AND logic configurations
- Positive-NOR buffering in digital circuits
- Systems requiring higher output voltage levels via external pullups
Procurement Notes
Verify the specific ordering suffix 'ADR' corresponds to the SOIC-14 tape-and-reel packaging configuration. Confirm that the commercial temperature grade (0°C to 70°C) aligns with system requirements, as military variants exist. Ensure design includes necessary resistive pullup components for proper open-collector operation.
Selection Notes
Select this component when four independent NOR gates with open-collector outputs are required. Verify compatibility with ALS-TTL logic families regarding input/output voltage thresholds. Consider the SOIC-14 package constraints for PCB layout and thermal management during selection.
Part Context
This part belongs to the Texas Instruments SN74ALS series of advanced low-power Schottky TTL logic devices. The 'SN74' prefix indicates a commercial temperature range variant, while the 'ALS' designation specifies the technology family. The 'ADR' suffix denotes surface-mount packaging in a tape-and-reel format suitable for automated assembly.
Replacement Considerations
SN74ALS33AD
FAQ
Why are external resistors required for this device?
The SN74ALS33ADR utilizes open-collector outputs which cannot actively drive the output high. Resistive pullup resistors are mandatory to establish a valid high logic level and define the output voltage.
What is the Boolean function implemented by this IC?
The device performs the Boolean function Y = A + B (positive logic OR) or equivalently Y = A · B (negative logic NAND), functioning as a 2-input positive-NOR buffer.
