SN74GTL16622A Texas Instruments
DESCRIPTION/ORDERING INFORMATION
The SN74GTL16622A is an 18-bit registered bus transceiver that provides LVTTL-to-GTL/GTL+ and GTL/GTL+-to-LVTTL signal-level translation. This device is partitioned as two separate 9-bit transceivers with individual clock-enable controls and contains D-type flip-flops for temporary storage of data flowing in either direction. 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. 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 clock (CLKAB and CLKBA) inputs. The clock-enable (CEAB) and CEBA inputs control each 9-bit transceiver independently, which makes the device more versatile.
FEATURES
- Member of Texas Instruments ™ Widebus Family
- OEC Circuitry Improves Signal Integrity and Reduces Electromagnetic Interference
- D-Type Flip-Flops With Qualified Storage Enable
- 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
- I off 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 Noise
- Latch-Up Performance Exceeds 250 mA Per JESD 17
- ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)

If you have SN74GTL16622A Texas Instruments in any of your printed circuit board projects, we appreciate the chance to offer the one stop service for you: bare PCB manufacturing, PCB assembly (SMT + DIP both) and component procument.
7. Set the reflow temperature, component direction, and solder paste thickness according to the datasheet of each comonent.
8. SMT first article inspection: check the datasheet of the components, check the chip size of each component and PCB, component direction, silk screen symbol, quantity etc. Measure the value of resistance, capacitance and inductance.
