Operating Voltage Range of 4.5 V to 5.5 V
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
P-N-P Inputs Reduce DC Loading
Data Flow-Through Pinout (All Inputs on
Opposite Side From Outputs)
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)

description/ordering information
The SN54BCT540 and SN74BCT540A octal buffers and line drivers are ideal for driving bus lines or buffer
memory-address registers. The devices feature inputs and outputs on opposite sides of the package to facilitate
printed circuit board layout.
The 3-state control gate is a 2-input AND gate with active-low inputs so that if either output-enable (OE1 or OE2)
input is high, all corresponding outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.