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Biestables, latches y registros
Latches tipo D

SN74ABT16843

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Bloqueos de interfaz de bus de tipo D de 18 bits con salidas de 3 estados

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SN74ABT16843

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Detalles del producto

Number of channels 18 Technology family ABT Input type TTL-Compatible CMOS Output type 3-State Clock frequency (max) (MHz) 150 IOL (max) (mA) 64 IOH (max) (mA) -32 Supply current (max) (µA) 85000 Features Flow-through pinout, Partial power down (Ioff), Power up 3-state, Very high speed (tpd 5-10ns) Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 18 Technology family ABT Input type TTL-Compatible CMOS Output type 3-State Clock frequency (max) (MHz) 150 IOL (max) (mA) 64 IOH (max) (mA) -32 Supply current (max) (µA) 85000 Features Flow-through pinout, Partial power down (Ioff), Power up 3-state, Very high speed (tpd 5-10ns) Operating temperature range (°C) -40 to 85 Rating Catalog
SSOP (DL) 56 190.647 mm² (18.42 mm × 10.35 mm)
  • Members of the Texas Instruments WidebusTM Family
  • State-of-the-Art EPIC-II BTM BiCMOS Design Significantly Reduces Power Dissipation
  • Distributed VCC and GND Pin Configuration Minimizes High-Speed Switching Noise
  • Flow-Through Architecture Optimizes PCB Layout
  • High-Impedance State During Power Up and Power Down
  • High-Drive Outputs (-32-mA IOH, 64-mA IOL)
  • Package Options Include Plastic Thin Shrink Small-Outline (DGG), 300-mil Shrink Small-Outline (DL) Packages and 380-mil Fine-Pitch Ceramic Flat (WD) Package Using 25-mil Center-to-Center Spacings

    Widebus and EPIC-IIB are trademarks of Texas Instruments Incorporated.
  • Members of the Texas Instruments WidebusTM Family
  • State-of-the-Art EPIC-II BTM BiCMOS Design Significantly Reduces Power Dissipation
  • Distributed VCC and GND Pin Configuration Minimizes High-Speed Switching Noise
  • Flow-Through Architecture Optimizes PCB Layout
  • High-Impedance State During Power Up and Power Down
  • High-Drive Outputs (-32-mA IOH, 64-mA IOL)
  • Package Options Include Plastic Thin Shrink Small-Outline (DGG), 300-mil Shrink Small-Outline (DL) Packages and 380-mil Fine-Pitch Ceramic Flat (WD) Package Using 25-mil Center-to-Center Spacings

    Widebus and EPIC-IIB are trademarks of Texas Instruments Incorporated.

The 'ABT16843 18-bit bus-interface D-type latches are designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The 'ABT16843 can be used as two 9-bit latches or one 18-bit latch. The 18 latches are transparent D-type latches. The device provides true data at its outputs.

A buffered output-enable (OE\) input can be used to place the nine outputs in either a normal logic state (high or low logic levels) or a high-impedance state. The outputs are in the high-impedance state during power up and power down. The outputs remain in the high-impedance state while the device is powered down. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without need for interface or pullup components.

OE\ does not affect the internal operations of the latch. Previously stored data can be retained or new data can be entered while the outputs are in the high-impedance state.

When VCC is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 2.1 V, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN54ABT16843 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABT16843 is characterized for operation from -40°C to 85°C.

The 'ABT16843 18-bit bus-interface D-type latches are designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The 'ABT16843 can be used as two 9-bit latches or one 18-bit latch. The 18 latches are transparent D-type latches. The device provides true data at its outputs.

A buffered output-enable (OE\) input can be used to place the nine outputs in either a normal logic state (high or low logic levels) or a high-impedance state. The outputs are in the high-impedance state during power up and power down. The outputs remain in the high-impedance state while the device is powered down. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without need for interface or pullup components.

OE\ does not affect the internal operations of the latch. Previously stored data can be retained or new data can be entered while the outputs are in the high-impedance state.

When VCC is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 2.1 V, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN54ABT16843 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABT16843 is characterized for operation from -40°C to 85°C.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos 18-Bit Bus-Interface D-Type Latches With 3-State Outputs datasheet (Rev. E) 1/05/1997
Nota sobre la aplicación Power-Up Behavior of Clocked Devices (Rev. B) PDF | HTML 15/12/2022

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