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SN74BCT2420FN PDF预览

SN74BCT2420FN

更新时间： 2024-10-02 09:15:03
品牌 Logo 应用领域
德州仪器 - TI 驱动程序和接口接口集成电路信息通信管理双倍数据速率
页数 文件大小 规格书
12页 183K
描述
NuBus ADDRESS/DATA TRANSCEIVERS AND REGISTERS

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SN74BCT2420FN 技术参数

是否无铅：含铅是否Rohs认证：不符合
生命周期：Obsolete零件包装代码：LCC
包装说明：1.27 MM PITCH, PLASTIC, MO-047AE, LCC-68针数：68
Reach Compliance Code：not_compliant风险等级：5.86
Is Samacsys：N接口集成电路类型：INTERFACE CIRCUIT
JESD-30 代码：S-PQCC-J68长度：24.2316 mm
功能数量：1端子数量：68
最高工作温度：70 °C最低工作温度：
封装主体材料：PLASTIC/EPOXY封装代码：QCCJ
封装形状：SQUARE封装形式：CHIP CARRIER
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
座面最大高度：5.08 mm最大供电电压：5.5 V
最小供电电压：4.5 V标称供电电压：5 V
表面贴装：YES技术：BICMOS
温度等级：COMMERCIAL端子形式：J BEND
端子节距：1.27 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：24.2316 mm
Base Number Matches：1

SN74BCT2420FN 数据手册

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SN74BCT2420  
NuBus ADDRESS/DATA TRANSCEIVERS AND REGISTERS  
SDIS007A – D3159, NOVEMBER 1988 – REVISED JANUARY 1989  
FN PACKAGE  
(TOP VIEW)  
• Designed for NuBus Interface  
Applications  
• Conforms to ANSI/IEEE Std 1196-1987  
• On-Chip Comparator Provides I/D Slot  
9
8
7
6
5
4
3
2
1 68 67 66 65 64 63 62 61  
60  
Identification  
AEN 10  
ID0  
ALE  
IDEQ  
ACLK 11  
ID3 12  
59  
58  
57  
56  
55  
54  
53  
52  
51  
50  
49  
48  
47  
46  
45  
44  
• Multiplexed Real-Time and Latched  
Address/Data  
SSEQ 13  
AD7 14  
AD6 15  
AD5 16  
AD4 17  
V
CC  
• Designed to Operate With SN74ACT2440  
AD15  
AD14  
AD13  
AD12  
GND  
AD11  
AD10  
AD9  
NuBus Controller  
• BiCMOS Design Substantially Reduces  
Standby Current  
18  
19  
20  
21  
22  
23  
24  
25  
26  
GND  
AD3  
AD2  
AD1  
AD0  
• Dependable Texas instruments Quality and  
Reliability  
AD8  
ID1  
ADEN  
DCLK  
ID2  
description  
V
CC  
A/D  
DLE  
DEN  
The ’BCT2420 consists of bus transceiver circuits,  
D-type flip-flops, latches, and control circuitry  
arranged for multiplexed transmission of address  
and data information in NuBus applications. An  
on-chip comparator has been included to detect  
when a NuBus transfer cycle is requesting the  
local board. The device conforms to ANSI/IEEE  
Std 1196-1987 and operates with Texas instru-  
27 28 29 30 31 32 33 34 3536 37 38 39 40 41 42 43  
ments SN74ACT2440 NuBus  
Controller. In  
addition, the device is easily configured around  
ASIC or other PAL -based controllers.  
The ’BCT2420 was designed using Texas Instruments BiCMOS process, which features bipolar drive  
characteristics and greatly reduces the standby power of the device when disabled. This feature is especially  
valuable when the device is not performing a NuBus transaction.  
The AEN, DEN and ADEN inputs control the transceiver functions. Three 16-bit I/O ports, A15–A0, D15–D0,  
and AD15–AD0, provide for address and data transfer. When the NuBus performs a write cycle to the local  
board, address information is saved on the rising edge of ACLK. During the last portion of the NuBus write  
cycle, data information is saved on the rising edge of DCLK.  
When the local board is performing a write to the NuBus , address and data is multiplexed onto the NuBus  
via the A/D line. Address and data can be latched by using the ALE and DLE input lines respectively.  
The IDEQ output is used to signal that the local board is being requested by the NuBus . This output is typically  
fedtotheNuBus controller. IDEQgoesactive(low)whenAD15–AD12arelowandAD11–AD8matchID3–ID0.  
IDEQ stays valid until the next address clock (ACLK) occurs. Internal 10-kΩ pullup resistors are included on the  
ID3–ID0 inputs.  
The SSEQ output is used to signal the local board that super-slot addresses are being requested. This output  
is active (low) whenever AD15–AD12 are equal to ID3–AD0, except when ID3–ID0 are all low.  
In typical NuBus applications, two devices are required to provide the full 32-bit address/data path. Refer to  
the typical NuBus interface diagram on page 9 for additional information.  
The SN74BCT2420 is characterized for operation from 0°C to 70°C.  
NuBus is a trademark of Texas Instruments Incorporated.  
PAL is a registered trademark of Monolithic Memories Inc.  
Copyright 1989, 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.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...12

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