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74VHCT240A

OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED)

STMicroelectronics 

74VHCT240A

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (INVERTED)

s HIGH SPEED: tPD = 5.4 ns (TYP.) at VCC = 5V

s LOW POWER DISSIPATION:

ICC = 4 µA (MAX.) at TA=25°C

s COMPATIBLE WITH TTL OUTPUTS:

VIH = 2V (MIN.), VIL = 0.8V (MAX)

s POWER DOWN PROTECTION ON INPUTS

& OUTPUTS

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 8 mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s OPERATING VOLTAGE RANGE:

VCC(OPR) = 4.5V to 5.5V

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 240

s IMPROVED LATCH-UP IMMUNITY

s LOW NOISE: VOLP = 0.9V (MAX.)

DESCRIPTION

The 74VHCT240A is an advanced high-speed

CMOS OCTAL BUS BUFFER (3-STATE)

fabricated with sub-micron silicon gate and

double-layer metal wiring C2MOS technology.

G enable input governs four BUS BUFFERs.

SOP

TSSOP

Table 1: Order Codes

PACKAGE

SOP

TSSOP

T&R

74VHCT240AMTR

74VHCT240ATTR

This device is designed to be used with 3 state

memory address drivers, etc.

Power down protection is provided on all inputs

and outputs and 0 to 7V can be accepted on

inputs with no regard to the supply voltage. This

device can be used to interface 5V to 3V since all

inputs are equipped with TTL threshold.

All inputs and outputs are equipped with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

Figure 1: Pin Connection And IEC Logic Symbols

December 2004

Rev. 4

1/12

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