SCBS673B - AUGUST 1996 - REVISED JANUARY 1998
Widebus is a trademark of Texas Instruments Incorporated.
These 18-bit registered bus transceivers contain two sets of D-type flip-flops for temporary storage of data flowing in either direction.
The 'GTL16622A devices provide live-insertion capability for backplane applications by tolerating active signals on the I/O pins when the devices are powered off.
The B port operates at GTL (VTT = 1.2 V and VREF = 0.8 V) and GTL+ (VTT = 1.5 V and VREF = 1 V) levels, while the A port and control pins are compatible with LVTTL and 5-V TTL logic levels. VREF 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 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.
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 SN54GTL16622A is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74GTL16622A is characterized for operation from -40°C to 85°C.
View more information about generic part numbers:SN74GTL16622A
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