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CD4025BE

Triple 3-input NOR gate, 4000B CMOS, 3-15V, 14-PDIP

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Manufacturer Part：

CD4025BE

Package：

14-PDIP

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Description

Product Overview

The CD4025BE from Texas Instruments is a triple 3-input NOR gate in the 4000B CMOS family. Each of the 3 independent gates performs the NOR function: output is HIGH only when all three inputs are LOW. With 3-15V supply range, it is useful for general-purpose logic and control circuits. Packaged in 14-PDIP.

Key Specifications

Logic Family 4000B CMOS
Function Triple 3-input NOR gate
Gates 3 (independent)
Propagation Delay 60ns (typ at 5V)
Supply Voltage 3V to 15V
Package 14-PDIP
Operating Temperature -55 to +125 C

Features

  • 3 independent 3-input NOR gates
  • NOR function: HIGH output only when all inputs LOW
  • 3-15V wide supply range
  • Standard 4000B CMOS pinout
  • Low power consumption

Applications

  • General-purpose logic circuits
  • Active-LOW decoding
  • Control logic with multiple conditions
  • CMOS-level interface circuits

The CD4025BE from Texas Instruments is a triple 3-input NOR gate in the 4000B CMOS family. It contains three independent NOR gates, each with three inputs and one output. The NOR function produces a HIGH output only when all three inputs are LOW; any HIGH input forces the output LOW. This makes the 3-input NOR particularly useful for active-LOW control logic where an action should occur only when multiple conditions are all inactive (LOW). The 3-15V supply range allows use in systems where 5V logic is not available, such as 9V or 12V battery-powered circuits. The CD4025BE complements the CD4023BE (triple 3-input NAND) and CD4001BE (quad 2-input NOR) in the 4000B logic family.

Each NOR gate in the CD4025BE uses a CMOS implementation with three parallel N-channel pull-down transistors and three series P-channel pull-up transistors. When any input is HIGH, at least one N-channel transistor turns on and at least one P-channel transistor turns off, pulling the output LOW. Only when all three inputs are LOW do all three N-channel transistors turn off and all three P-channel transistors turn on, pulling the output HIGH. The propagation delay of 60ns at 5V is slower than 74HC logic but adequate for most control and interface applications. The 3-15V supply range allows direct interface with other 4000B devices at higher voltages without level translation.

Pin Name Function
1 1A Gate 1 input A
2 1B Gate 1 input B
3 2A Gate 2 input A
4 2B Gate 2 input B
5 2C Gate 2 input C
6 2Y Gate 2 output
7 VSS Ground
8 3Y Gate 3 output
9 3A Gate 3 input A
10 3B Gate 3 input B
11 3C Gate 3 input C
12 1Y Gate 1 output
13 1C Gate 1 input C
14 VDD Supply voltage (3-15V)
  • Active-LOW control logic with 3-input NOR for multi-condition gating
  • 3-15V logic interface circuits at non-standard supply voltages
  • General-purpose CMOS logic with triple 3-input NOR function
  • Decoding and control with NOR-based active-HIGH-when-all-LOW logic
Model Manufacturer Key Difference
CD4023BE TI Triple 3-input NAND (complement function)
CD4001BE TI Quad 2-input NOR, more gates but 2 inputs each
74HC27N TI 74HC triple 3-input NOR, 2-6V, faster
74LS27N TI TTL triple 3-input NOR
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