74F821 datasheet(2/18 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F821/822/823/824/825/826

Bus interface registers

1996 Jan 05

853-1304 16195

74F821

10-bit bus interface register, non-inverting (3-State)

74F822

10-bit bus interface register, inverting (3-State)

74F823

9-bit bus interface register, non-inverting (3-State)

74F824

9-bit bus interface register, inverting (3-State)

74F825

8-bit bus interface register, non-inverting (3-State)

74F826

8-bit bus interface register, inverting (3-State)

FEATURES

• High speed parallel registers with positive edge-triggered D-type

flip-flops

• High performance bus interface buffering for wide data/address

paths or busses carrying parity

• High impedance PNP base inputs for reduced loading (20µA in

high and low states)

• I

IL is 20µA vs 1000µA for AM29821 series

• Buffered control inputs to reduce AC effects

• Ideal where high speed, light loading, or increased fan-in as

required with MOS microprocessor

• Positive and negative over-shoots are clamped to ground

• 3-State outputs glitch free during power-up and power-down

• Slim Dip 300 mil package

• Broadside pinout compatible with AMD AM 29821-29826 series

• Outputs sink 64mA and source 24mA

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

74F823

DESCRIPTION

The 74F821 series bus interface registers are designed to

eliminate the extra packages required to buffer existing registers and

provide extra data width for wider data/address paths of busses

carrying parity.

The 74F821/74F822 are buffered 10-bit wide versions of the popular

74F374/74F534 functions.

The 74F822 is the inverted output version of 74F821.

The 74F823 and 74F824 are 9-bit wide buffered registers with clock

enable (CE) and master reset (MR) which are ideal for parity bus

interfacing in high microprogrammed systems.

The 74F824 is the inverted version of 74F823.

The 74F825 and 74F826 are 8-bit buffered registers with all the

74F823/74F824 controls plus output enable (OE0, OE1, OE2) to

allow multiuser control of the interface, e.g., CS, DMA, and RD/WR.

They are ideal for uses as an output port requiring high IOL/IOH.

The 74F826 is the inverted version of 74F825.

TYPE

TYPICAL

fmax

TYPICAL

SUPPLY CURRENT

(TOTAL)

74F821, 74F822

180MHz

75mA

74F823, 74F824

180MHz

70mA

74F825, 74F826

180MHz

65mA

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

INDUSTRIAL RANGE

VCC = 5V ±10%,

Tamb = –40°C to +85°C

PKG. DWG. #

24-pin plastic slim DIP (300mil)

N74F821N, N74F822N, N74F823N,

N74F824N, N74F825N, N74F826N

I74F823N

SOT222-1

24-pin plastic SOL

N74F821D, N74F822D, N74F823D,

N74F824D, N74F825D, N74F826D

I74F823D

SOT137-1

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