英译汉一段话•Package Options Include Plastic andCeramic DIPs

英译汉一段话
•Package Options Include Plastic and
Ceramic DIPs
•Dependable Texas Instruments Quality
and Reliabillty
description
The H78 and L78 contain two J-K flip-flops with individual J-K,preset inputs,and common clock and common clear inputs．The H78 and L78 are positive pulse-triggered flip-flops．J-K input is loaded into the master while the clock is high and transferred to the sIave 0n the high-to-low transition．For these devices the J and K inputs must be stable while the clock is high．
The LS78A contain two negative-edge-triggered flip-flops with individual J-K,preset inputs,and common cIock and common clear inputs．The logic levels at the J and K inputs may be allowed to change while the clock pulse is high and the flip-flop will perform according to the function table as long as minimum setup and hold times are observed.The preset and clear are asynchronous active low inputs.When low they override the clock and data inputs forcing the outputs to the steady state levels as shown in the function table• The SN54H78,SN54L78,and the SN54LS78A are characterized for operation over the full military temperature range of -55℃ to 125℃．The SN74H78 and the SN74LS78A are characterized for operation from 0℃ to 70℃．
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•封装类型包括塑料和陶瓷DIP（双列直插封装）
•值得信赖的德州仪器（TI）品质和可靠性
描述
H78和L78包含两个J-K触发器,其带有单独J-K、预设输入以及公共时钟和公共清零输入.H78和L78均为正脉冲触发器.当时钟为高电平时,J-K输入被装载进主机,时钟从高到低跳变时,J-L输入被传送到从机.这些器件的时钟为高电平时,J和K输入必须保持稳定.
LS78A包含两个负边沿触发器,其带有单独J-K、预设输入以及共用时钟和共用清零输入.当时钟脉冲为高电平时,J和K的输入端逻辑电平可允许变化,此时只要最小设置时间和保持时间符合要求,触发器就将按功能表操作.预设和清零功能为异步低电平输入有效.低电平时,这两个功能优先于时钟和数据输入,强制输出稳态电平,如功能表所示.
•SN54H78、SN54L78和SN54LS78A均可在整个军用温度级-55℃至125℃下工作.SN74H78和SN74LS78A的工作温度范围为0℃至70℃.
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