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SN74BCT646

更新时间: 2024-11-04 22:53:35
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德州仪器 - TI 总线收发器输出元件
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9页 132K
描述
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SN74BCT646 数据手册

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SN54BCT646, SN74BCT646  
OCTAL BUS TRANSCEIVERS AND REGISTERS  
WITH 3-STATE OUTPUTS  
SCBS037C – AUGUST 1989 – REVISED NOVEMBER 1993  
SN54BCT646 . . . JT OR W PACKAGE  
SN74BCT646 . . . DW OR NT PACKAGE  
(TOP VIEW)  
State-of-the-Art BiCMOS Design  
Significantly Reduces I  
CCZ  
ESD Protection Exceeds 2000 V Per  
MIL-STD-883C, Method 3015; Exceeds  
200 V Using Machine Model (C = 200 pF,  
R = 0)  
CLKAB  
SAB  
DIR  
A1  
V
CC  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
CLKBA  
SBA  
OE  
B1  
2
3
Bus Transceivers/Registers  
4
A2  
5
Independent Registers and Enables for  
A3  
B2  
6
A and B Buses  
A4  
B3  
7
Multiplexed Real-Time and Stored Data  
Power-Up High-Impedance Mode  
A5  
B4  
8
A6  
B5  
9
Package Options Include Plastic  
A7  
A8  
GND  
B6  
B7  
B8  
10  
11  
12  
Small-Outline (DW) Packages, Ceramic  
Chip Carriers (FK) and Flatpacks (W), and  
Plastic and Ceramic 300-mil DIPs (JT, NT)  
SN54BCT646 . . . FK PACKAGE  
(TOP VIEW)  
description  
These devices consist of bus transceiver circuits,  
D-type flip-flops, and control circuitry arranged for  
multiplexed transmission of data directly from the  
inputbusorfromtheinternalregisters. Dataonthe  
A or B bus is clocked into the registers on the  
low-to-high transition of the appropriate clock  
(CLKAB or CLKBA) input. Figure 1 illustrates the  
four fundamental bus-management functions that  
can be performed with the BCT646.  
4
3
2
1 28 27 26  
A1  
A2  
A3  
NC  
A4  
A5  
A6  
OE  
24 B1  
25  
5
6
23  
22  
21  
20  
19  
7
B2  
NC  
B3  
B4  
B5  
8
9
Output-enable (OE) and direction-control (DIR)  
inputs are provided to control the transceiver  
functions. In the transceiver mode, data present at  
the high-impedance port may be stored in either  
register or in both.  
10  
11  
12 13 14 15 16 17 18  
NC – No internal connection  
The select-control (SAB and SBA) inputs can  
multiplex stored and real-time (transparent mode)  
data. The direction control (DIR) determines which bus will receive data when OE is low. In the isolation mode  
(OE high), A data may be stored in one register and/or B data may be stored in the other register.  
When an output function is disabled, the input function is still enabled and may be used to store and transmit  
data. Only one of the two buses, A or B, may be driven at a time.  
The SN54BCT646 is characterized for operation over the full military temperature range of 55°C to 125°C. The  
SN74BCT646 is characterized for operation from 0°C to 70°C.  
Copyright 1993, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
2–1  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

SN74BCT646 替代型号

型号 品牌 替代类型 描述 数据表
SN54BCT646 TI

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