74HC259D/74HCT259D是8位可寻址锁存器
74hc259d/74hct259d是8位可寻址锁存器介绍：
the 74hc/hct259 are high-speed si-gate cmos devices and are pin compatible with low power schottky ttl (lsttl). they are specified in compliance with jedec standard no. 7a.
the 74hc/hct259 are high-speed 8-bit addressable latches designed for general purpose storage applications in digital systems. the “259” are multifunctional devices capable of storing single-line data in eight addressable latches, and also 3-to-8 decoder and demultiplexer, with active high outputs (q0 to q7), functions are available.
the “259” also incorporates an active low common reset (mr) for resetting all latches, as well as, an active low enable input (le).
the “259” has four modes of operation as shown in the mode select table. in the addressable latch mode, data on the data line (d) is written into the addressed latch. the
addressed latch will follow the data input with all non-addressed latches remaining in their previous states.in the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs. in the 3-to-8 decoding or demultiplexing mode, the addressed output follows the state of the d input with all other outputs in the low state. in the reset mode all outputs are low and unaffected by the address (a0 to a2) and data (d) input. when operating the “259” as an addressable latch, changing more than one bit of address could impose a transient-wrong address. therefore, this should only be done while in the memory mode. the mode select table summarizes the operations of the “259”.
74hc259d/74hct259d功能说明
· combines demultiplexer and 8-bit latch
· serial-to-parallel capability
· output from each storage bit available
· random (addressable) data entry
· easily expandable
· common reset input
· useful as a 3-to-8 active high decoder
· output capability: standard
· icc category: msi
74hc259d/74hct259d引脚管脚说明-pin description
pin no. symbol name and function
1, 2, 3 a0 to a2 address inputs
4, 5, 6, 7, 9 10, 11, 12 q0 to q7 latch outputs
8 gnd ground (0 v)
13 d data input
14 le latch enable input (active low)
15 mr conditional reset input (active low)
16 vcc positive supply voltage
74hc259d/74hct259d逻辑图
更详细资料请查看：74hc259d
国科微高质量发展 2022上半年营业收入166722.46万元同比增长75.16%
基于无线传感器网络的嵌入式远程测控系统研究
节卡发布的新一代共融系列协作机器人之一JAKA Ai 7
秘密武器：TI DLP显示技术
聚积预计明年将开始量产MiniLED 业绩大幅成长可期
74HC259D/74HCT259D是8位可寻址锁存器
如何根据需求选购什么分辨率的投影仪？
半导体测试设备商Lasertec支持EUV测试设备的需求正在扩大
华润微CS98P171的特点
乙类放大互补对称电路
华为与欧派家居集团将在智能家居领域开启深度合作
直流接触器的电弧特性介绍
旧款iPhone只能连接到2.4GHz和5GHz频段?
龙芯中科新型工控芯片与工业软件联合创新实验室揭牌，上海这一传感器项目斩获“大飞机”创新创业大赛一
基于TSMC 0.25μm CMOS工艺实现ADC采样保持电路的设计
Dialog其FusionHD™ NOR闪存兼容并已在SmartBond™低功耗蓝牙无线MCU平台上认证
贝尔模型202蓝牙电话的制作教程
MQTT工业级无线路由器的特点
FPGA中定点数的处理方法
德州仪器(TI)的破损玻璃检测器解决方案
the 74hc/hct259 are high-speed si-gate cmos devices and are pin compatible with low power schottky ttl (lsttl). they are specified in compliance with jedec standard no. 7a.
the 74hc/hct259 are high-speed 8-bit addressable latches designed for general purpose storage applications in digital systems. the “259” are multifunctional devices capable of storing single-line data in eight addressable latches, and also 3-to-8 decoder and demultiplexer, with active high outputs (q0 to q7), functions are available.
the “259” also incorporates an active low common reset (mr) for resetting all latches, as well as, an active low enable input (le).
the “259” has four modes of operation as shown in the mode select table. in the addressable latch mode, data on the data line (d) is written into the addressed latch. the
addressed latch will follow the data input with all non-addressed latches remaining in their previous states.in the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs. in the 3-to-8 decoding or demultiplexing mode, the addressed output follows the state of the d input with all other outputs in the low state. in the reset mode all outputs are low and unaffected by the address (a0 to a2) and data (d) input. when operating the “259” as an addressable latch, changing more than one bit of address could impose a transient-wrong address. therefore, this should only be done while in the memory mode. the mode select table summarizes the operations of the “259”.
74hc259d/74hct259d功能说明
· combines demultiplexer and 8-bit latch
· serial-to-parallel capability
· output from each storage bit available
· random (addressable) data entry
· easily expandable
· common reset input
· useful as a 3-to-8 active high decoder
· output capability: standard
· icc category: msi
74hc259d/74hct259d引脚管脚说明-pin description
pin no. symbol name and function
1, 2, 3 a0 to a2 address inputs
4, 5, 6, 7, 9 10, 11, 12 q0 to q7 latch outputs
8 gnd ground (0 v)
13 d data input
14 le latch enable input (active low)
15 mr conditional reset input (active low)
16 vcc positive supply voltage
74hc259d/74hct259d逻辑图
更详细资料请查看：74hc259d
国科微高质量发展 2022上半年营业收入166722.46万元同比增长75.16%
基于无线传感器网络的嵌入式远程测控系统研究
节卡发布的新一代共融系列协作机器人之一JAKA Ai 7
秘密武器：TI DLP显示技术
聚积预计明年将开始量产MiniLED 业绩大幅成长可期
74HC259D/74HCT259D是8位可寻址锁存器
如何根据需求选购什么分辨率的投影仪？
半导体测试设备商Lasertec支持EUV测试设备的需求正在扩大
华润微CS98P171的特点
乙类放大互补对称电路
华为与欧派家居集团将在智能家居领域开启深度合作
直流接触器的电弧特性介绍
旧款iPhone只能连接到2.4GHz和5GHz频段?
龙芯中科新型工控芯片与工业软件联合创新实验室揭牌，上海这一传感器项目斩获“大飞机”创新创业大赛一
基于TSMC 0.25μm CMOS工艺实现ADC采样保持电路的设计
Dialog其FusionHD™ NOR闪存兼容并已在SmartBond™低功耗蓝牙无线MCU平台上认证
贝尔模型202蓝牙电话的制作教程
MQTT工业级无线路由器的特点
FPGA中定点数的处理方法
德州仪器(TI)的破损玻璃检测器解决方案