74HC240; 74HCT240

Octal buffer/line driver; 3-state; inverting

Rev. 6 — 2 September 2021

Product data sheet

1. General description

The 74HC240; 74HCT240 is an 8-bit inverting buffer/line driver with 3-state outputs. The device

can be used as two 4-bit buffers or one 8-bit buffer. The device features two output enables (1OE

and 2OE), each controlling four of the 3-state outputs. A HIGH on nOE causes the outputs to

assume a high-impedance OFF-state. Inputs include clamp diodes. This enables the use of current

limiting resistors to interface inputs to voltages in excess of VCC.

2. Features and benefits

• Wide supply voltage range from 2.0 V to 6.0 V

• CMOS low power dissipation

• High noise immunity

• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

• Complies with JEDEC standards:

• JESD8C (2.7 V to 3.6 V)

• JESD7A (2.0 V to 6.0 V)

• Input levels:

• For 74HC240: CMOS level

• For 74HCT240: TTL level

• Inverting 3-state outputs

• ESD protection:

• • HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

• Multiple package options

• Specified from -40 °C to +85 °C and from -40 °C to +125 °C

3. Ordering information

Table 1. Ordering information

Package

Type number

Temperature range Name

Description

Version

74HC240D

74HCT240D

-40 °C to +125 °C

SO20

plastic small outline package; 20 leads;

body width 7.5 mm

SOT163-1

74HC240PW

74HCT240PW

-40 °C to +125 °C

TSSOP20

plastic thin shrink small outline package; 20 leads;

body width 4.4 mm

SOT360-1

74HC240BQ

74HCT240BQ

-40 °C to +125 °C

DHVQFN20 plastic dual in-line compatible thermal enhanced

very thin quad flat package; no leads; 20 terminals;

body 2.5 × 4.5 × 0.85 mm

SOT764-1