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N74F244N

Octal buffers (3-State)

Philips Electronics 

Philips Semiconductors

Octal buffers (3-State)

Product specification

74F244/74F244B

FEATURES

• Octal bus interface

• 3-State output buffer sink 64mA

• 15mA source current

• Guaranteed output skew less than 2.0ns (74F244B)

• Reduced ground bounce (74F244B)

• Reduced ICC (74F244B)

• Reduced loading (74F244B IIL = 40µA)

• Split lead frame offers increased noise immunity (74F244B)

• Industrial temperature range available (-40°C to +85°C) for

74F244

• 74F244 available in SSOP Type II package

DESCRIPTION

The 74F244 is an octal buffer that is ideal for driving bus lines of

buffer memory address registers. The outputs are all 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.

The 74F244B is functionally equivalent to the 74F244. It has been

designed to reduce effects of ground noise. Other advantages are

noted in the features.

TYPE

74F244

74F244B

TYPICAL

PROPAGATION

DELAY

4.0ns

4.0ns

TYPICAL SUPPLY

CURRENT (TOTAL)

53mA

33mA

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

20-pin plastic DIP

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

N74F244N, N74F244BN

INDUSTRIAL RANGE

VCC = 5V ±10%,

Tamb = -40°C to +85°C

I74F244N

20-pin plastic SOL

N74F244D, N74F244BD

I74F244D

20-pin plastic SSOP II

N74F244DB

PKG DWG #

SOT146-1

SOT163-1

SOT339-1

INPUT AND OUTPUT LOADING AND FAN OUT TABLE

PINS

DESCRIPTION

Ian, Ibn

Data inputs (74F244)

Data inputs (74F244B)

OEa, OEb

Output enable inputs (active low) (74F244)

Output enable inputs (active low) (74F244B)

Yan, Ybn

Data outputs

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

74F (U.L.)

HIGH/LOW

1.0/2.67

1.0/0.067

1.0/1.67

1.0/0.067

750/106.7

LOAD VALUE

HIGH/LOW

20µA/1.6mA

20µA/40µA

20µA/1.0mA

20µA/40µA

15mA/64mA

PIN CONFIGURATION

LOGIC SYMBOL

OEa 1

Ia0 2

Yb0 3

Ia1 4

Yb1 5

Ia2 6

Yb2 7

Ia3 8

Yb3 9

GND 10

20 VCC

19 OEb

18 Ya0

17 Ib0

16 Ya1

15 Ib1

14 Ya2

13 Ib2

12 Ya3

11 Ib3

SF00227

2 4 6 8 17 15 13 11

Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3

1

OEa

19

OEb

Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3

VCC = Pin 20

GND = Pin 10

18 16 14 12 3 5 7 9

SF00228

1994 Dec 5

2

853-0357 14381

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