74F1241 datasheet(2/10 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F1240, 74F1241*

Buffers

74F1240

Octal inverter buffer (3-State)

1999 Jan 08

853–0039 20619

* Discontinued part. Please see the Discontinued Products List.

FEATURES

• High impedance NPN base inputs for reduced loading

(20

µA in High and Low states)

• Low power, light loading

• Functional pin-for-pin equivalent of 74F240 and 74F241

• 1/30th the bus loading of 74F240 and 74F241

• Provides ideal interface and increase fan-out of MOS

microprocessors

• Octal bus interface

• 3-State buffer outputs sink 64mA

• 15mA source current

DESCRIPTION

The 74F1240 and 74F1241 are octal buffers that are ideal for driving

bus lines or buffer memory address registers. The outputs are

capable of sinking 64mA and sourcing up to 15mA, producing very

good capacitive drive characteristics. The device features two

Output Enables, OEa and OEb, each controlling four of the 3-State

outputs.

TYPE

TYPICAL

PROPAGATION

DELAY

TYPICAL

SUPPLY CURRENT

(TOTAL)

74F1240

3.5ns

40mA

74F1241

4.5ns

46mA

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

DRAWING

NUMBER

20-pin plastic DIP

N74F1240N

SOT146-1

20-pin plastic SOL

N74F1240D

SOT163-1

INPUT AND OUTPUT LOADING AND FAN OUT TABLE

PINS

DESCRIPTION

74F (U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

Ian, Ibn

Data inputs

1.0/0.033

µA/20µA

OEa, OEb

Output enable inputs (active Low)

1.0/0.033

µA/20µA

OEb

Output enable input (active High, 74F1241)

1.0/0.033

µA/20µA

Yan, Ybn

Data outputs (74F1241)

750/106.7

15mA/64mA

Yan, Ybn

Data outputs (74F1240)

750/106.7

15mA/64mA

NOTE: One (1.0) FAST unit load is defined as: 20

µA in the High state and 0.6mA in the Low state.

74F1241 Datasheet(PDF) 2 Page - NXP Semiconductors

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