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SN74HC02DR

Quad 2-input NOR gate, 2-6V, 5.2mA drive, 10-50ns tpd, SOIC-14

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Pieza del fabricante：

SN74HC02DR

Paquete：

SOIC-14 (8.65 x 3.90 x 1.58 mm, D package)

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Descripción

Productos

The SN74HC02DR from Texas Instruments is a quadruple 2-input positive NOR gate in a 14-pin SOIC package, operating from 2V to 6V with 5.2mA output drive and 10-50ns propagation delay.

Especificaciones

Logic Function Quad 2-Input NOR Gate
Number of Gates 4
Tensión de alimentación 2V to 6V
Output Drive Current 5.2 mA (sink/source)
Retardo de propagación 10-50 ns (typ, VCC=4.5V)
Input Type Standard CMOS
Output Type Push-Pull
Logic Function (positive) Y = NOT(A OR B)
ESD Protection HBM >2000V, CDM >1000V
Paquete SOIC-14 (8.65 x 3.90mm)
Temperatura de funcionamiento -40 to +85 C

Características

  • Four independent 2-input NOR gates
  • Buffered inputs for improved noise immunity
  • Wide 2V to 6V operating voltage range
  • Supports fanout to 10 LSTTL loads
  • Significant power reduction vs LSTTL
  • Latch-up performance >100mA per JESD 78

Aplicaciones

  • SR latch circuits (NOR gates for set-reset)
  • Alarm and tamper detection circuits
  • Logic inversion and OR functions
  • General-purpose digital logic

The SN74HC02DR from Texas Instruments is a quadruple 2-input positive NOR gate from the 74HC (High-Speed CMOS) logic family. The device contains four independent NOR gates, each performing the Boolean function Y = NOT(A OR B) in positive logic, or equivalently Y = A NOR B. The NOR gate is one of the universal logic gates, meaning any combinational or sequential logic function can be implemented using only NOR gates. A common application is the SR (Set-Reset) latch, where two cross-coupled NOR gates form a basic memory element with Set and Reset inputs. The 74HC family operates from a wide supply voltage range of 2V to 6V, making it compatible with 3.3V and 5V logic systems. Buffered inputs provide improved noise immunity compared to unbuffered designs, with CMOS input thresholds at approximately 50% of VCC. The output can sink or source up to 5.2mA, sufficient to drive up to 10 LSTTL loads or multiple CMOS inputs. The propagation delay of 10-50ns (depending on supply voltage) supports data rates up to 28Mbps. The SOIC-14 surface-mount package (DR suffix) is suitable for automated PCB assembly. The device features latch-up immunity exceeding 100mA per JESD 78 Class II and ESD protection exceeding 2000V HBM and 1000V CDM.

The SN74HC02DR operates as four independent CMOS NOR gates. Key operating principles include: (1) NOR Gate Logic – each gate implements the function Y = NOT(A OR B); the output Y is LOW only when at least one input (A or B) is HIGH; the output Y is HIGH only when both inputs A and B are LOW; this truth table makes NOR gates useful for active-HO control signals and SR latch construction; (2) CMOS Complementary Output – each gate uses a PMOS/NMOS complementary output stage that actively drives both HIGH and LOW levels; this push-pull output provides rail-to-rail swing (VCC to GND) with low output impedance; the 5.2mA drive capability is symmetric for sourcing and sinking; (3) Buffered Input – each gate input includes a buffer stage (two inverters in series) before the core NOR logic; buffering increases the input threshold sharpness and noise immunity; the CMOS input draws essentially zero DC current (only leakage), allowing large fanout to other CMOS devices; (4) SR Latch – two NOR gates can be cross-coupled (output of each feeds an input of the other) to form an SR latch; Set (S=1, R=0) makes Q=1; Reset (S=0, R=1) makes Q=0; S=R=0 holds the previous state; S=R=1 is an invalid condition (both Q and not-Q go LOW); (5) Power Consumption – static power consumption is near zero (only leakage current, typically <1uA); dynamic power consumption is P = CPD x VCC^2 x f, where CPD is the power dissipation capacitance; this makes HC logic much more power-efficient than bipolar LSTTL.

Pin Nombre Función
1 1Y Gate 1 output
2 1A Gate 1 input A
3 1B Gate 1 input B
4 2Y Gate 2 output
5 2A Gate 2 input A
6 2B Gate 2 input B
7 GND Suelo
8 3A Gate 3 input A
9 3B Gate 3 input B
10 3Y Gate 3 output
11 4A Gate 4 input A
12 4B Gate 4 input B
13 4Y Gate 4 output
14 VCC Supply voltage (2V to 6V)
  • SR latch: two NOR gates cross-coupled for debounced switch or power-on reset
  • Alarm detection: NOR gate detects when all sensors are inactive (all inputs LOW = alarm active)
  • Logic OR inversion: NOR gate followed by inverter creates OR function
  • Active-LOW control: NOR gate combines multiple active-HIGH fault signals into active-LOW shutdown
Fabricante Número de pieza Paquete Notas
Nexperia 74HC02D SOIC-14 Pin-compatible equivalent
TI SN74HC02PWR TSSOP-14 Smaller TSSOP package
TI SN74HC02N PDIP-14 Through-hole version
Nexperia 74HCT02D SOIC-14 TTL-compatible input thresholds
TI CD4001BM SOIC-14 4000-series NOR gate, 3-15V
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