DM74AS648WM

更新时间： 2024-11-14 22:15:35

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		总线驱动器总线收发器触发器逻辑集成电路光电二极管
页数	文件大小	规格书
8页	85K
描述
Octal Bus Transceiver and Register

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技术参数
数据手册

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DM74AS648WM 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SOP, SOP24,.4
针数：	24	Reach Compliance Code：	compliant
风险等级：	5.53	Is Samacsys：	N
其他特性：	WITH DIRECTION CONTROL	控制类型：	INDEPENDENT CONTROL
计数方向：	BIDIRECTIONAL	系列：	AS
JESD-30 代码：	R-PDSO-G24	JESD-609代码：	e3
长度：	15.4 mm	逻辑集成电路类型：	REGISTERED BUS TRANSCEIVER
最大I（ol）：	0.048 A	湿度敏感等级：	1
位数：	8	功能数量：	1
端口数量：	2	端子数量：	24
最高工作温度：	70 °C	最低工作温度：
输出特性：	3-STATE	输出极性：	INVERTED
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP24,.4	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
电源：	5 V	Prop。Delay @ Nom-Sup：	8 ns
传播延迟（tpd）：	9 ns	认证状态：	Not Qualified
座面最大高度：	2.65 mm	子类别：	Bus Driver/Transceivers
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
技术：	TTL	温度等级：	COMMERCIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	翻译：	N/A
触发器类型：	POSITIVE EDGE	宽度：	7.5 mm
Base Number Matches：	1

DM74AS648WM 数据手册

October 1986

Revised March 2000

DM74AS646 • DM74AS648

Octal Bus Transceiver and Register

General Description

Features

This device incorporates an octal bus transceiver and an

octal D-type register configured to enable multiplexed

transmission of data from bus to bus or internal register to

bus.

■ Switching specifications at 50 pF

■ Switching specifications guaranteed over full tempera-

ture and V_CCrange

■ Advanced oxide-isolated, ion-implanted Schottky TTL

This bus transceiver features totem-pole 3-STATE outputs

designed specifically for driving highly-capacitive or rela-

tively low-impedance loads. The high-impedance third

state and increased high-logic-level drive provide this

device with the capability of being connected directly to and

driving the bus lines in a bus-organized system without

need for interface or pull-up components. It is particularly

attractive for implementing buffer registers, I/O ports, bidi-

rectional bus drivers, and working registers.

process

■ Functionally and pin-for-pin compatible with LS TTL

counterpart

■ 3-STATE buffer-type outputs drive bus lines directly

The registers in the DM74AS646, DM74AS648 are edge-

triggered D-type flip-flops. On the positive transition of the

clock (CAB or CBA), the input bus data is stored.

The SAB and SBA control pins are provided to select

whether real-time data or stored data is transferred. A LOW

input level selects real-time data, and a HIGH level selects

stored data. The select controls have a “make before

break” configuration to eliminate a glitch which would nor-

mally occur in a typical multiplexer during the transition

between stored and real-time data.

The enable G and direction control pins provide four modes

of operation; real-time data transfer from bus A to B, real-

time data transfer from bus B to A, real-time bus A and/or B

data transfer to internal storage, or internal store data

transfer to bus A or B.

When the enable G pin is LOW, the direction pin selects

which bus receives data. When the enable G pin is HIGH,

both buses become disabled yet their input function is still

enabled.

Ordering Code:

Order Number Package Number

Package Description

DM74AS646WM

DM74AS646NT

DM74AS648WM

DM74AS648NT

M24B

N24C

M24B

N24C

24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide

24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide

24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide

24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

DS006324

www.fairchildsemi.com

12 3 4 5 6 7 8

中文翻译

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与DM74AS648WM相关器件

型号	品牌	获取价格	描述	数据表
DM74AS648WMX	ETC	获取价格	Single 8-Bit Inverting Bus Transceiver
DM74AS651	FAIRCHILD	获取价格	Octal Bus Transceiver and Register
DM74AS651J/A+	ETC	获取价格	Single 8-Bit Inverting Bus Transceiver
DM74AS651N/A+	ETC	获取价格	Single 8-Bit Inverting Bus Transceiver
DM74AS651N/B+	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,DIP,24PIN,PLASTIC
DM74AS651NT	FAIRCHILD	获取价格	Octal Bus Transceiver and Register
DM74AS651NT/A+	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,DIP,24PIN,PLASTIC
DM74AS651NT/B+	ETC	获取价格	Single 8-Bit Inverting Bus Transceiver
DM74AS651WM	FAIRCHILD	获取价格	Octal Bus Transceiver and Register
DM74AS651WMX	FAIRCHILD	获取价格	Registered Bus Transceiver, AS Series, 1-Func, 8-Bit, Inverted Output, TTL, PDSO24, 0.300

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