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74HCT125D

Quad buffer/line driver, 3-state, HCT, SOIC-14, 13ns, LSTTL compatible, bus driver

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Pieza del fabricante：

74HCT125D

Paquete：

SOIC-14 (8.65 x 3.91 x 1.58 mm)

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Descripción

Productos

The 74HCT125D from Nexperia is a quad buffer/line driver with 3-state outputs in SOIC-14. Each buffer has an active-low output enable, allowing bus-oriented applications where multiple devices share common data lines. HCT input levels provide compatibility with LSTTL while driving CMOS-level outputs.

Especificaciones

Logic Family 74HCT
Tensión de alimentación 4.5 V to 5.5 V
Retardo de propagación 13 ns (typ)
Corriente de salida +/-6 mA
Input Levels LSTTL compatible (HCT)
Canales 4 (independent)
Output Enable Active low (per buffer)
Temperatura de funcionamiento -40C to +125C

Características

  • Quad non-inverting buffer with individual 3-state output enables
  • HCT input compatibility with LSTTL logic levels
  • Active-low output enable per channel for bus sharing
  • 13ns typical propagation delay for fast signal buffering

Aplicaciones

  • Bus driver and buffer for microprocessor systems
  • 3-state bus interface for shared data lines
  • Level translation between TTL and CMOS
  • Signal buffering and fan-out enhancement

The 74HCT125D from Nexperia is a quad non-inverting buffer/line driver with 3-state outputs in SOIC-14. Each of the four buffers has an independent active-low output enable (OE), allowing individual channel control for bus-oriented applications. The HCT input logic levels are compatible with LSTTL (VIH=2.0V, VIL=0.8V) while the outputs drive full CMOS levels at VCC. The device operates from 4.5V to 5.5V with 13ns typical propagation delay and +/-6mA output drive current. When OE is high, the output enters high-impedance state, allowing bus sharing with other devices.

The 74HCT125D contains four independent non-inverting buffers with 3-state output control. (1) Buffer: Each buffer passes the input data to the output without inversion. The HCT input stage has TTL-compatible threshold (VIH=2.0V, VIL=0.8V), enabling direct interface with LSTTL outputs. The output stage drives full CMOS voltage levels. (2) 3-State Control: When the output enable (OE) pin is low, the buffer output is active and drives the data. When OE is high, both the pull-up and pull-down transistors in the output stage are turned off, placing the output in a high-impedance (Hi-Z) state. This allows multiple 3-state devices to share a common bus without contention. (3) Bus Sharing: Only one device should drive the bus at a time. The 13ns propagation delay and fast enable/disable times allow efficient bus arbitration.

Pin Nombre Tipo Función
1 1OE Entrada Channel A output enable (active low)
2 1A Entrada Channel A data input
3 1Y Salida Channel A output (3-state)
4 2OE Entrada Channel B output enable (active low)
5 2A Entrada Channel B data input
6 2Y Salida Channel B output (3-state)
7 GND Suelo Suelo
8-14 3Y/3A/3OE/4Y/4A/4OE/VCC E/S Channels C, D, and power
  • Microprocessor bus driver with 3-state output for shared data lines
  • Level translation between TTL outputs and CMOS inputs
  • Signal buffering and fan-out enhancement for clock and control signals
  • I/O port expansion with individual enable control
Fabricante Número de pieza Paquete Notas
TI SN74HCT125DR SOIC-14 Direct equivalent
onsemi MC74HCT125ADG SOIC-14 Direct equivalent
Nexperia 74HC125D SOIC-14 HC version, CMOS inputs
Nexperia 74HCT126D SOIC-14 Active-high enable version
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