54F646

更新时间： 2024-01-24 17:28:06

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
12页	204K
描述
Octal Transceiver/Register with TRI-STATE Outputs

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54F646 技术参数

生命周期：	Active	包装说明：	,
Reach Compliance Code：	compliant	风险等级：	5.77
Base Number Matches：	1

54F646 数据手册

December 1994

54F/74F646 74F646B 54F/74F648

Octal Transceiver/Register with TRI-STATE Outputs

General Description

Features

Independent registers for A and B buses

These devices consist of bus transceiver circuits with TRI-

STATE, D-type flip-flops, and control circuitry arranged for

multiplexed transmission of data directly from the input bus

or from the internal registers. Data on the A or B bus will be

clocked into the registers as the appropriate clock pin goes

to a high logic level. Control G and direction pins are provid-

ed to control the transceiver function. In the transceiver

mode, data present at the high impedance port may be

stored in either the A or the B register or in both. The select

controls can multiplex stored and real-time (transparent

mode) data. The direction control determines which bus will

receive data when the enable control G is Active LOW. In

the isolation mode (control G HIGH), A data may be stored

in the B register and/or B data may be stored in the A regis-

ter.

Multiplexed real-time and stored data

’F648 has inverting data paths

’F646/’F646B have non-inverting data paths

’F646B is a faster version of the ’F646

TRI-STATE outputs

300 mil slim DIP

Guaranteed 4000V minimum ESD protection

Package

Number

Commercial

74F646SPC

Military

Package Description

N24C

J24F

24-Lead (0.300 Wide) Molded Dual-In-Line

54F646DM (Note 2)

24-Lead (0.300 Wide) Ceramic Dual-In-Line

74F646SC (Note 1)

74F646MSA (Note 1)

M24B

MSA24

W24C

E28A

N24C

M24B

N24C

J24F

24-Lead (0.300 Wide) Molded Small Outline, JEDEC

24-Lead Molded Shrink Small Outline, EIAJ, Type II

54F646FM (Note 2)

54F646LM (Note 2)

24-Lead Cerpack

28-Lead Ceramic Leadless Chip Carrier, Type C

74F646BSPC

24-Lead (0.300 Wide) Molded Dual-In-Line

74F646BSC (Note 1)

74F648SPC

24-Lead (0.300 Wide) Molded Small Outline, JEDEC

24-Lead (0.300 Wide) Molded Dual-In-Line

54F648SDM (Note 2)

24-Lead (0.300 Wide) Ceramic Dual-In-Line

74F648SC (Note 1)

M24B

W24C

E28A

24-Lead (0.300 Wide) Molded Small Outline, JEDEC

54F648FM (Note 2)

54F648LM (Note 2)

24-Lead Cerpack

24-Lead Ceramic Leadless Chip Carrier, Type C

Note 1: Devices also available in 13 reel. Use suffix

SCX.

Note 2: Military grade device with environmental and burn-in processing. Use suffix

DMQB, FMQB and LMQB.

Logic Symbols

’F646/’F646B

’F648

TL/F/9580–1

TL/F/9580–7

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/9580

RRD-B30M75/Printed in U. S. A.

12 3 4 5 6 7...12

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