SN74LS240 Octal buffers and line drivers |

SN74LS240 (ACTIVE) Octal buffers and line drivers



The SNx4LS24x, SNx4S24x octal buffers and line drivers are designed specifically to improve both the performance and density of three-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The designer has a choice of selected combinations of inverting and non-inverting outputs, symmetrical, active-low output-control (G) inputs, and complementary output-control (G and G) inputs. These devices feature high fan-out, improved fan-in, and 400-mV noise margin. The SN74LS24x and SN74S24x devices can be used to drive terminated lines down to 133 Ω.


  • Inputs Tolerant Down to 2 V, Compatible With 3.3-V or 2.5-V Logic Inputs
  • Maximum tpd of 15 ns at 5 V
  • 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
  • PNP Inputs Reduce DC Loading
  • Hysteresis at Inputs Improves Noise Margins


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Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Channels (#) IOL (Max) (mA) IOH (Max) (mA) ICC (uA) Input type Output type Features Data rate (Mbps) Rating Operating temperature range (C) Package Group
SN74LS240 Order now LS     4.75     5.25     8     24     -15     50000     Bipolar     3-State     High speed (tpd 10-50ns)
Input clamp diode    
70     Catalog     0 to 70     PDIP | 20
SOIC | 20
SO | 20
SSOP | 20    
SN54LS240 Samples not available LS     4.5     5.5     8     24     -15     44000     Bipolar     3-State     High speed (tpd 10-50ns)     70     Military     -55 to 125     CDIP | 20
CFP | 20
LCCC | 20