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SN74ALVTH16821

OBSOLETE

2.5-V/3.3-V 20-Bit Bus-Interface Flip-Flops With 3-State Outputs

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Data sheet
SN74ALVTH16821 is no longer in production
This product is no longer in production. New designs should consider an alternate product.
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SN74ALVCH16821 ACTIVE 3.3-V 20-Bit Bus-Interface Flip-Flop with 3-State Outputs Replacement

SN74ALVTH16821

OBSOLETE
Data sheet Order now

Product details

Number of channels 20 Technology family ALVT Supply voltage (min) (V) 2.3 Supply voltage (max) (V) 3.6 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) 5000 Features Bus-hold, Partial power down (Ioff), Power up 3-state, Ultra high speed (tpd <5ns) Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 20 Technology family ALVT Supply voltage (min) (V) 2.3 Supply voltage (max) (V) 3.6 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) 5000 Features Bus-hold, Partial power down (Ioff), Power up 3-state, Ultra high speed (tpd <5ns) Operating temperature range (°C) -40 to 85 Rating Catalog
SSOP (DL) 56 190.647 mm² 18.42 x 10.35 TSSOP (DGG) 56 113.4 mm² 14 x 8.1 TVSOP (DGV) 56 72.32 mm² 11.3 x 6.4
  • State-of-the-Art Advanced BiCMOS Technology (ABT) WidebusTM Design for 2.5-V and 3.3-V Operation and Low Static Power Dissipation
  • Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 2.3-V to 3.6-V VCC)
  • Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3 V, TA = 25°C
  • High-Drive (-24/24 mA at 2.5-V and
    -32/64 mA at 3.3-V VCC)
  • Power Off Disables Outputs, Permitting Live Insertion
  • High-Impedance State During Power Up and Power Down Prevents Driver Conflict
  • Uses Bus Hold on Data Inputs in Place of External Pullup/Pulldown Resistors to Prevent the Bus From Floating
  • Auto3-State Eliminates Bus Current Loading When Output Exceeds VCC + 0.5 V
  • Latch-Up Performance Exceeds 250 mA Per JESD 17
  • ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model; and Exceeds 1000 V Using Charged-Device Model, Robotic Method
  • Flow-Through Architecture Facilitates Printed Circuit Board Layout
  • Distributed VCC and GND Pin Configuration Minimizes High-Speed Switching Noise
  • Package Options Include Plastic Shrink Small-Outline (DL), Thin Shrink Small-Outline (DGG), Thin Very Small-Outline (DGV) Packages, and 380-mil Fine-Pitch Ceramic Flat (WD) Package

    Widebus is a trademark of Texas Instruments Incorporated.
  • State-of-the-Art Advanced BiCMOS Technology (ABT) WidebusTM Design for 2.5-V and 3.3-V Operation and Low Static Power Dissipation
  • Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 2.3-V to 3.6-V VCC)
  • Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3 V, TA = 25°C
  • High-Drive (-24/24 mA at 2.5-V and
    -32/64 mA at 3.3-V VCC)
  • Power Off Disables Outputs, Permitting Live Insertion
  • High-Impedance State During Power Up and Power Down Prevents Driver Conflict
  • Uses Bus Hold on Data Inputs in Place of External Pullup/Pulldown Resistors to Prevent the Bus From Floating
  • Auto3-State Eliminates Bus Current Loading When Output Exceeds VCC + 0.5 V
  • Latch-Up Performance Exceeds 250 mA Per JESD 17
  • ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model; and Exceeds 1000 V Using Charged-Device Model, Robotic Method
  • Flow-Through Architecture Facilitates Printed Circuit Board Layout
  • Distributed VCC and GND Pin Configuration Minimizes High-Speed Switching Noise
  • Package Options Include Plastic Shrink Small-Outline (DL), Thin Shrink Small-Outline (DGG), Thin Very Small-Outline (DGV) Packages, and 380-mil Fine-Pitch Ceramic Flat (WD) Package

    Widebus is a trademark of Texas Instruments Incorporated.

The 'ALVTH16821 devices are 20-bit bus-interface flip-flops with 3-state outputs designed for 2.5-V or 3.3-V VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.

The devices can be used as two 10-bit flip-flops or one 20-bit flip-flop. The 20-bit flip-flops are edge-triggered D-type flip-flops. On the positive transition of the clock (CLK), the flip-flops store the logic levels set up at the D inputs.

A buffered output-enable (OE\) input can be used to place the ten outputs in either a normal logic state (high or low level) or a high-impedance state. 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 operation of the flip-flops. Old 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 1.2 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.2 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.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN54ALVTH16821 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALVTH16821 is characterized for operation from -40°C to 85°C.

The 'ALVTH16821 devices are 20-bit bus-interface flip-flops with 3-state outputs designed for 2.5-V or 3.3-V VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.

The devices can be used as two 10-bit flip-flops or one 20-bit flip-flop. The 20-bit flip-flops are edge-triggered D-type flip-flops. On the positive transition of the clock (CLK), the flip-flops store the logic levels set up at the D inputs.

A buffered output-enable (OE\) input can be used to place the ten outputs in either a normal logic state (high or low level) or a high-impedance state. 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 operation of the flip-flops. Old 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 1.2 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.2 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.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN54ALVTH16821 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALVTH16821 is characterized for operation from -40°C to 85°C.

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* Data sheet 2.5-V/3.3-V 20-Bit Bus-Interface Flip-Flops With 3-State Outputs datasheet (Rev. E) 08 Jan 1999

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