M74HCT240PUM1R Ver la hoja de datos (PDF) - STMicroelectronics

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M74HCT240PUM1R

OCTAL BUS BUFFERS WITH PULL-UP INPUT NETWORK

STMicroelectronics 

M54HCT240/241/244PU

M74HCT240/241/244PU

OCTAL BUS BUFFERS WITH PULL-UP INPUT NETWORK

. HIGH SPEED

tPD = 14 ns (TYP.) at VCC = 5V

. LOW POWER DISSIPATION

ICCH = 200 µA (TYP.) at TA = 25 oC

. COMPATIBLE WITH TTL OUTPUTS

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

. CURRENT SOURCES ON DATA INPUTS

ELIMINATE THE NEED OF EXTERNAL PULL-

UP RESISTORS

. OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

. SYMMETRICAL OUTPUT IMPEDANCE

|IOH| = IOL = 6 mA (MIN)

. BALANCED PROPAGATION DELAYS

tPLH = tPHL

. PIN AND FUNCTION COMPATIBLE

WITH 54/74LS240/241/244

B1R

(Plastic Package)

F1R

(Ceramic Package)

M1R

(Micro Package)

ORDER CODES :

M54HCTXXXPUF1R M74HCTXXXPUM1R

M74HCTXXXPUB1R

DESCRIPTION

The M54/74HCT240PU, HCT241PU and

HCT244PU are high speed CMOS OCTAL BUS

BUFFERs fabricated in silicon gate C2MOS

technology.

They have the same high speed performance of their

non-PU counterpart, plus a unique input topology

which incorporates a constant current source for

each data input. This results is in a small IIL (-150 µA

Typ.) wich can fix any data input in the HIGH Logic

Level when it is left floating, thus eliminating the need

of external pull-up resistor network.

This feature makes these devices particularly

suitable in all applications where a data bus needs to

be interfaced to manual controls like: rotary selectors,

keyboards, dip-switches, etc. The inputs are

compatible with TTL, NMOS and CMOS output

voltage levels. They achieve the high speed

operation similar to equivalent LSTTL while

maintaining the CMOS low power dissipation.

All inputs are equipped with protection circuits

against static discharge and transient excess

voltage.

PIN CONNECTION (top view)

H CT 240PU

HCT241PU

HCT244PU

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