74F1241 데이터 시트보기 (PDF) - Philips Electronics

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74F1241

Octal inverter buffer (3-State)

Philips Electronics 

Philips Semiconductors

Buffers

Product specification

74F1240, 74F1241*

74F1240 Octal inverter buffer (3-State)

FEATURES

• High impedance NPN base inputs for reduced loading

(20µA 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

TYPE

74F1240

74F1241

TYPICAL

PROPAGATION

DELAY

3.5ns

4.5ns

TYPICAL

SUPPLY CURRENT

(TOTAL)

40mA

46mA

ORDERING INFORMATION

DESCRIPTION

20-pin plastic DIP

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

N74F1240N

20-pin plastic SOL

N74F1240D

DRAWING

NUMBER

SOT146-1

SOT163-1

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.

INPUT AND OUTPUT LOADING AND FAN OUT TABLE

PINS

DESCRIPTION

74F (U.L.)

HIGH/LOW

Ian, Ibn

Data inputs

1.0/0.033

OEa, OEb

Output enable inputs (active Low)

1.0/0.033

OEb

Output enable input (active High, 74F1241)

1.0/0.033

Yan, Ybn

Data outputs (74F1241)

750/106.7

Yan, Ybn

Data outputs (74F1240)

750/106.7

NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.

LOAD VALUE

HIGH/LOW

20µA/20µA

20µA/20µA

20µA/20µA

15mA/64mA

15mA/64mA

* Discontinued part. Please see the Discontinued Products List.

1999 Jan 08

2

853–0039 20619

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