SN54GTL16923, SN74GTL16923 18-BIT LVTTL-TO-GTL/GTL+ BUS TRANSCEIVERS

SCBS674D - AUGUST 1996 - REVISED JULY 1997

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features

• Members of the Texas Instruments Widebus^TM Family
• Translate Between GTL/GTL+ Signal Levels and LVTTL or 5-V TTL Signal Levels
• Support Mixed-Mode Signal Operation on All Ports (5-V Input/Output Voltages With 3.3-V V_CC)
• Support GTL/GTL+ Signal Operation on B Port
• ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
• D-Type Flip-Flops With Qualified Storage Enable
• Latch-Up Performance Exceeds 250 mA Per JESD 17
• Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors on A Port
• Flow-Through Architecture Facilitates Printed Circuit Board Layout
• Package Options Include Plastic Thin Shrink Small-Outline (DGG) and Ceramic Quad Flat (HV) Packages

Widebus is a trademark of Texas Instruments Incorporated.

description

These 18-bit registered bus transceivers contain two sets of D-type flip-flops for temporary storage of data flowing in either direction.

The B port operates at GTL (V_TT = 1.2 V and V_REF = 0.8 V) and GTL+ (V_TT = 1.5 V and V_REF = 1 V) levels, while the A port and control pins are compatible with LVTTL and 5-V TTL logic levels. V_REF is the reference input voltage for the B port.

Data flow in each direction is controlled by the output-enable (OEAB\ and OEBA\) and the clock (CLKAB and CLKBA) inputs. The clock-enable (CEAB\ and CEBA\) inputs are used to enable or disable the clock for all 18 bits at a time. However, OEAB\ and OEBA\ are designed to control each 9-bit transceiver independently, which makes the device more versatile.

For A-to-B data flow, the device operates on the low-to-high transition of CLKAB if CEAB\ 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\, CLKBA, and CEBA\.

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

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices in a mixed 3.3-V/5-V system environment.

To ensure the high-impedance state during power up or power down, OE\ should be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN54GTL16923 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74GTL16923 is characterized for operation from -40°C to 85°C

View more information about generic part numbers:SN74GTL16923

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