SN74GTL16616

AKTIV

17-Bit-LVTTL-zu-GTL/GTL+-Universal-Bustransceiver mit gepufferten Taktausgängen

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Produktdetails

Technology family GTL Applications GTL Rating Catalog Operating temperature range (°C) -40 to 85
Technology family GTL Applications GTL Rating Catalog Operating temperature range (°C) -40 to 85
SSOP (DL) 56 190.647 mm² 18.42 x 10.35
  • Member of Texas Instruments' Widebus™ Family
  • UBT™ Transceiver Combines D-Type Latches and D-Type Flip-Flops for Operation in Transparent, Latched, Clocked, or Clock-Enabled Modes
  • OEC™ Circuitry Improves Signal Integrity and Reduces Electromagnetic Interference
  • GTL Buffered CLKAB Signal (CLKOUT)
  • Translates Between GTL/GTL+ Signal Levels and LVTTL Logic Levels
  • Supports Mixed-Mode (3.3 V and 5 V) Signal Operation on A-Port and Control Inputs
  • Equivalent to \x9216601 Function
  • Ioff Supports Partial-Power-Down Mode Operation
  • Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors on A Port
  • Distributed VCC and GND Pins Minimize High-Speed Switching Noise
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)

OEC, UBT, and Widebus are trademarks of Texas Instruments.

  • Member of Texas Instruments' Widebus™ Family
  • UBT™ Transceiver Combines D-Type Latches and D-Type Flip-Flops for Operation in Transparent, Latched, Clocked, or Clock-Enabled Modes
  • OEC™ Circuitry Improves Signal Integrity and Reduces Electromagnetic Interference
  • GTL Buffered CLKAB Signal (CLKOUT)
  • Translates Between GTL/GTL+ Signal Levels and LVTTL Logic Levels
  • Supports Mixed-Mode (3.3 V and 5 V) Signal Operation on A-Port and Control Inputs
  • Equivalent to \x9216601 Function
  • Ioff Supports Partial-Power-Down Mode Operation
  • Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors on A Port
  • Distributed VCC and GND Pins Minimize High-Speed Switching Noise
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)

OEC, UBT, and Widebus are trademarks of Texas Instruments.

The SN74GTL16616 is a 17-bit UBT™ transceiver that provides LVTTL-to-GTL/GTL+ and GTL/GTL+-to-LVTTL signal-level translation. Combined D-type flip-flops and D-type latches allow for transparent, latched, clocked, and clocked-enabled modes of data transfer identical to the '16601 function. Additionally, this device provides for a copy of CLKAB at GTL/GTL+ signal levels (CLKOUT) and conversion of a GTL/GTL+ clock to LVTTL logic levels (CLKIN). This device provides an interface between cards operating at LVTTL logic levels and a backplane operating at GTL/GTL+ signal levels. Higher-speed operation is a direct result of the reduced output swing (<1 V), reduced input threshold levels, and OEC™ circuitry.

The user has the flexibility of using this device at either GTL (VTT = 1.2 V and VREF = 0.8 V) or the preferred higher noise margin GTL+ (VTT = 1.5 V and VREF = 1 V) signal levels. GTL+ is the Texas Instruments derivative of the Gunning Transceiver Logic (GTL) JEDEC standard JESD 8-3. The B port normally operates at GTL or GTL+ signal levels, while the A-port and control inputs are compatible with LVTTL logic levels and are 5-V tolerant. V REF is the reference input voltage for the B port. VCC (5 V) supplies the internal and GTL circuitry while VCC (3.3 V) supplies the LVTTL output buffers.

Data flow in each direction is controlled by output-enable (OEAB\ and OEBA\), latch-enable (LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. The clock can be controlled by the clock-enable (CEAB\ and CEBA\) inputs. For A-to-B data flow, the device operates in the transparent mode when LEAB is high. When LEAB is low, the A data is latched if CEAB\ is low and CLKAB is held at a high or low logic level. If LEAB is low, the A-bus data is stored in the latch/flip-flop on the low-to-high transition of CLKAB if CEAB\ also is low. When OEAB\ is low, the outputs are active. When OEAB\ is high, the outputs are in the high-impedance state. Data flow for B to A is similar to that of A to B, but uses OEBA\, LEBA, CLKBA, and CEBA\.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

Active bus-hold circuitry holds unused or undriven LVTTL inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

To ensure the high-impedance state during power up or power down, 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 SN74GTL16616 is a 17-bit UBT™ transceiver that provides LVTTL-to-GTL/GTL+ and GTL/GTL+-to-LVTTL signal-level translation. Combined D-type flip-flops and D-type latches allow for transparent, latched, clocked, and clocked-enabled modes of data transfer identical to the '16601 function. Additionally, this device provides for a copy of CLKAB at GTL/GTL+ signal levels (CLKOUT) and conversion of a GTL/GTL+ clock to LVTTL logic levels (CLKIN). This device provides an interface between cards operating at LVTTL logic levels and a backplane operating at GTL/GTL+ signal levels. Higher-speed operation is a direct result of the reduced output swing (<1 V), reduced input threshold levels, and OEC™ circuitry.

The user has the flexibility of using this device at either GTL (VTT = 1.2 V and VREF = 0.8 V) or the preferred higher noise margin GTL+ (VTT = 1.5 V and VREF = 1 V) signal levels. GTL+ is the Texas Instruments derivative of the Gunning Transceiver Logic (GTL) JEDEC standard JESD 8-3. The B port normally operates at GTL or GTL+ signal levels, while the A-port and control inputs are compatible with LVTTL logic levels and are 5-V tolerant. V REF is the reference input voltage for the B port. VCC (5 V) supplies the internal and GTL circuitry while VCC (3.3 V) supplies the LVTTL output buffers.

Data flow in each direction is controlled by output-enable (OEAB\ and OEBA\), latch-enable (LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. The clock can be controlled by the clock-enable (CEAB\ and CEBA\) inputs. For A-to-B data flow, the device operates in the transparent mode when LEAB is high. When LEAB is low, the A data is latched if CEAB\ is low and CLKAB is held at a high or low logic level. If LEAB is low, the A-bus data is stored in the latch/flip-flop on the low-to-high transition of CLKAB if CEAB\ also is low. When OEAB\ is low, the outputs are active. When OEAB\ is high, the outputs are in the high-impedance state. Data flow for B to A is similar to that of A to B, but uses OEBA\, LEBA, CLKBA, and CEBA\.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

Active bus-hold circuitry holds unused or undriven LVTTL inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

To ensure the high-impedance state during power up or power down, 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.

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Technische Dokumentation

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Typ Titel Datum
* Data sheet 17-Bit LVTTL-to-GTL/GTL+ Universal Bus Xceiver With Buffered Clock Outputs datasheet (Rev. H) 06 Aug 2001
Application note Schematic Checklist - A Guide to Designing with Auto-Bidirectional Translators PDF | HTML 12 Jul 2024
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Application note Implications of Slow or Floating CMOS Inputs (Rev. E) 26 Jul 2021
Selection guide Voltage Translation Buying Guide (Rev. A) 15 Apr 2021
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dez 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004
Application note TI IBIS File Creation, Validation, and Distribution Processes 29 Aug 2002
Application note Power-Up 3-State (PU3S) Circuits in TI Standard Logic Devices 10 Mai 2002
User guide GTLP/GTL Logic High-Performance Backplane Drivers Data Book (Rev. A) 15 Sep 2001
Selection guide Advanced Bus Interface Logic Selection Guide 09 Jan 2001
Application note GTL/BTL: A Low-Swing Solution for High-Speed Digital Logic (Rev. A) 01 Mär 1997
Application note Understanding Advanced Bus-Interface Products Design Guide 01 Mai 1996

Design und Entwicklung

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Simulationsmodell

SN74GTL16616 IBIS Model

SCEM036.ZIP (11 KB) - IBIS Model
Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
SSOP (DL) 56 Ultra Librarian

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