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Technology family TTL Supply voltage (min) (V) 4.5 Supply voltage (max) (V) 5.5 Input type TTL Output type TTL Operating temperature range (°C) -55 to 125 Rating Military
Technology family TTL Supply voltage (min) (V) 4.5 Supply voltage (max) (V) 5.5 Input type TTL Output type TTL Operating temperature range (°C) -55 to 125 Rating Military
CDIP (J) 16 135.3552 mm² 19.56 x 6.92
  • 3-State Outputs Interface Directly With System Bus
  • Gated Output-Control LInes for Enabling or Disabling the Outputs
  • Fully Independent Clock Virtually Eliminates Restrictions for Operating in One of Two Modes:
    • Parallel Load
    • Do Nothing (Hold)
  • For Application as Bus Buffer Registers
  • Package Options Include Plastic Small-Outline (D) Packages, Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) DIPs
  • 3-State Outputs Interface Directly With System Bus
  • Gated Output-Control LInes for Enabling or Disabling the Outputs
  • Fully Independent Clock Virtually Eliminates Restrictions for Operating in One of Two Modes:
    • Parallel Load
    • Do Nothing (Hold)
  • For Application as Bus Buffer Registers
  • Package Options Include Plastic Small-Outline (D) Packages, Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) DIPs

The '173 and 'LS173A 4-bit registers include D-type flip-flops featuring totem-pole 3-state outputs capable of driving highly capacitive
or relatively low-impedance loads. The high-impedance third state and increased high-logic-level drive provide these flip-flops 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. Up to 128 of the SN74173 or SN74LS173A outputs can be connected to a common bus and still drive two Series 54/74 or 54LS/74LS TTL normalized loads, respectively. Similarly, up to 49 of the SN54173 or SN54LS173A outputs can be connected to a common bus and drive one additional Series 54/74 or 54LS/74LS TTL normalized load, respectively. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output control circuitry is designed so that the average output disable times are shorter than the average output enable times.

Gated enable inputs are provided on these devices for controlling the entry of data into the flip-flops. When both data-enable (G\1, G\2) inputs are low, data at the D inputs are loaded into their respective flip-flops on the next positive transition of the buffered clock input. Gate output-control (M, N) inputs also are provided. When both are low, the normal logic states (high or low levels) of the four outputs are available for driving the loads or bus lines. The outputs are disabled independently from the level of the clock by a high logic level at either output-control input. The outputs then present a high impedance and neither load nor drive the bus line. Detailed operation is given in the function table.

The SN54173 and SN54LS173A are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74173 and SN74LS173A are characterized for operation from 0°C to 70°C.

The '173 and 'LS173A 4-bit registers include D-type flip-flops featuring totem-pole 3-state outputs capable of driving highly capacitive
or relatively low-impedance loads. The high-impedance third state and increased high-logic-level drive provide these flip-flops 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. Up to 128 of the SN74173 or SN74LS173A outputs can be connected to a common bus and still drive two Series 54/74 or 54LS/74LS TTL normalized loads, respectively. Similarly, up to 49 of the SN54173 or SN54LS173A outputs can be connected to a common bus and drive one additional Series 54/74 or 54LS/74LS TTL normalized load, respectively. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output control circuitry is designed so that the average output disable times are shorter than the average output enable times.

Gated enable inputs are provided on these devices for controlling the entry of data into the flip-flops. When both data-enable (G\1, G\2) inputs are low, data at the D inputs are loaded into their respective flip-flops on the next positive transition of the buffered clock input. Gate output-control (M, N) inputs also are provided. When both are low, the normal logic states (high or low levels) of the four outputs are available for driving the loads or bus lines. The outputs are disabled independently from the level of the clock by a high logic level at either output-control input. The outputs then present a high impedance and neither load nor drive the bus line. Detailed operation is given in the function table.

The SN54173 and SN54LS173A are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74173 and SN74LS173A are characterized for operation from 0°C to 70°C.

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类型 标题 下载最新的英语版本 日期
* 数据表 4-Bit D-Type Registers With 3-State Outputs 数据表 (Rev. A) 1999年 6月 1日
应用手册 Power-Up Behavior of Clocked Devices (Rev. B) PDF | HTML 2022年 12月 15日
选择指南 Logic Guide (Rev. AB) 2017年 6月 12日
应用手册 Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 2015年 12月 2日
选择指南 逻辑器件指南 2014 (Rev. AA) 最新英语版本 (Rev.AB) 2014年 11月 17日
用户指南 LOGIC Pocket Data Book (Rev. B) 2007年 1月 16日
应用手册 Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 2004年 7月 8日
应用手册 使用逻辑器件进行设计 (Rev. C) 1997年 6月 1日
应用手册 Input and Output Characteristics of Digital Integrated Circuits 1996年 10月 1日
应用手册 Live Insertion 1996年 10月 1日

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CDIP (J) 16 查看选项

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  • REACH
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  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
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