Buffers

Buffers, also known as logic buffers are semiconductor IC (integrated circuit) that are constructed of two inverters that are back to back providing a basic logic gate that passes its input, unchanged, to its output. Buffer ICs are also available in both inverting and non-inverting.

How do buffers work?

The primary purpose of a buffer IC is to regenerate the input, primarily using a strong low and high and also to regenerate weak output from non-restoring logic. They are also used to increase the propagation delay of circuits by driving the large capacitive load.

Buffers also feature transceivers and drivers that are used to regenerate the input utilising a strong high and a strong low. Buffer gates serve as an amplifier of a weak signal source is cant source a lot of current whilst increasing the current capacity of the signal so as to be able to drive a load.

Types of buffers

Buffers are available with a variety of configurations such as variations on the number of channels available, supporting a variety of different inputs and outputs such as CMOS, DTL (Diode-Transistor Logic) and single-ended and providing support for a range of logic families such as HC, HEF and TTL. Buffers are also available in combination with a converter.

Another type of buffer that is available is Bus buffers. A bus buffer is an IC that connects multiple data sources to a single bus. The open drivers can be selected to be either a logical high, a logical low, or high impedance which allows other buffers to drive the bus. Like buffers, variations of bus buffers are available such as support for different logic families, inputs, outputs as well as the number of pins configured on the IC.

Bus buffers are used in applications such as TV and video equipment, industrial controls and portable equipment.

Application

Buffers have a wide range of application use such as;

  • Automatic test equipment
  • Board test systems
  • Instrumentation and characterization equipment
  • Semiconductor test systems

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Description Price Logic Family Logic Function IC Type Number of Channels Schmitt Trigger Input Input Type Output Type Polarity Mounting Type Package Type Pin Count Maximum High Level Output Current Maximum Low Level Output Current Maximum Propagation Delay Time @ Maximum CL
RS Stock No. 171-3289
Mfr. Part No.74LCX125FT
BrandToshiba
SGD0.139
Each (On a Reel of 2500)
units
74LCX - - - - - - - Surface Mount TSSOP 14 -24mA 24mA 22 ns @ 50 pF
RS Stock No. 166-3736
Mfr. Part No.NC7SP34P5X
SGD0.133
Each (On a Reel of 3000)
units
TinyLogic ULP Buffer - 1 No Power Down High Impedance Power Down High Impedance Non-Inverting Surface Mount SC-70 5 -2.6mA 2.6mA 46.3ns
RS Stock No. 145-3987
Mfr. Part No.NLU2G17AMX1TCG
SGD0.144
Each (On a Reel of 3000)
units
NLU Schmitt Trigger Buffer - 2 Yes Single Ended CMOS Non-Inverting Surface Mount ULLGA 6 -8mA 8mA 20.5 ns @ 50 pF
RS Stock No. 171-3009
Mfr. Part No.TC7SET126F
BrandToshiba
SGD0.109
Each (On a Reel of 3000)
units
- - - - - - - - Surface Mount SOT-25 5 -8mA 8mA 13 ns @ 50 pF
RS Stock No. 634-596
Mfr. Part No.CD74HCT125E
SGD1.13
Each
units
HCT Buffer, Line Driver - 4 No Single Ended 3 State Non-Inverting Through Hole PDIP 14 -6mA 6mA 25 ns @ 4.5 V
RS Stock No. 805-3055
Mfr. Part No.NLU2G17AMX1TCG
SGD0.448
Each (In a Pack of 50)
units
NLU Schmitt Trigger Buffer - 2 Yes Single Ended CMOS Non-Inverting Surface Mount ULLGA 6 -8mA 8mA 20.5 ns @ 50 pF
RS Stock No. 163-0528
Mfr. Part No.MC14050BDR2G
SGD0.239
Each (On a Reel of 2500)
units
CMOS Buffer - 6 No Single Ended - Non-Inverting Surface Mount SOIC 16 30mA -4.7mA 140ns
RS Stock No. 162-8913
Mfr. Part No.MC74VHCT125ADR2G
SGD0.188
Each (On a Reel of 2500)
units
HCT - - - - - - - Surface Mount SOIC 14 -25mA 25mA 16 ns @ 50 pF
RS Stock No. 124-2311
Mfr. Part No.HEF4050BT,652
BrandNexperia
SGD0.559
Each (In a Tube of 50)
units
4000 Buffer, Converter - 6 No Single Ended - Non-Inverting Surface Mount SOIC 16 - - 110 ns @ 5 V