SN54GTL16622, SN74GTL16622 18-BIT LVTTL-TO-GTL/GTL+ TRANSCEIVERS

SCES049C - AUGUST 1995 - REVISED OCTOBER 1996

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features

Translate Between GTL/GTL+ Signal Levels and LVTTL
Members of the Texas Instruments Widebus^TM Family
Support GTL/GTL+ Signal Operation on B Port
D-Type Flip-Flops With Qualified Storage Enable
Bus-Hold Data Inputs Eliminate the Need for External Pullup or 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

description

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

The B port operates at GTL (V_TT = 1.2 V andV_REF = 0.8 V) and GTL+ (V_TT = 1.5 V andV_REF = 1 V) levels, while the A port and control inputsare compatible with LVTTL logic levels.

Data flow in each direction is controlled by output-enable ( and ) and clock (CLKAB and CLKBA)inputs. The clock-enable ( and) inputs aredesigned to control each 9-bit transceiver independently, which makesthe device more versatile.

For A-to-B data flow, the devices operate on the low-to-hightransition of CLKAB if islow. When is low, theoutputs are active. When ishigh, the outputs are in the high-impedance state. Data flow for B toA is similar to that for A to B, but uses , CLKBA, and .

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

To ensure the high-impedance state during power up or power down, should be tiedto V_CC through a pullup resistor; the minimum value of theresistor is determined by the current-sinking capability of thedriver.

The SN54GTL16622 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74GTL16622 is characterized for operation from -40°C to85°C.

A-to-B data flow is shown: B-to-A data flow is similar butuses , CLKBA, and.

Output level before the indicated steady-state inputconditions are established

Title: 18-BIT LVTTL TO GTL/GTLPLUS BUS TRANSCEIVERS
Product Family: STANDARD TRANSCEIVERS
Device Functionality: GTL
Orderable Devices: SN74GTL16622DGGR

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View more information about generic part numbers:SN74GTL16622

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