These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation allows for maximum flexibility in timing.

The ’HCT623 devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending upon the logic levels at the output-enable (OEAB and OEBA\) inputs.

The output-enable inputs disable the device so that the buses are effectively isolated. The dual-enable configuration gives the transceivers the capability to store data by simultaneously enabling OEAB and OEBA\. Each output reinforces its input in this transceiver configuration. When both OEAB and OEBA\ are enabled and all other data sources to the two sets of bus lines are in the high-impedance state, both sets of bus lines (16 total) remain at their last states. The 8-bit codes appearing on the two sets of buses are identical.

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

• Operating Voltage Range of 4.5 V to 5.5 V
• Low Power Consumption, 80-μA Max ICC
• Typical tpd = 11 ns
• ±6-mA Output Drive at 5 V
• Low Input Current of 1 μA Max
• Inputs Are TTL-Voltage Compatible
• Lock Bus-Latch Capability
• True Logic
• High-Current 3-State Outputs Can Drive Up To 15 LSTTL Loads

• IOL (Max) (mA)
• 6
• IOH (Max) (mA)
• -6
• Technology Family
• HCT
• Rating
• Catalog
• Operating temperature range (C)
• -40 to 85

SN74HCT623的完整型号有：SN74HCT623N，以下是这些产品的关键参数及官网采购报价：

SN74HCT623N，工作温度：-40 to 85，封装：PDIP (N)-20，包装数量MPQ：20个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网SN74HCT623N的批量USD价格：2.677（1000+）

14-24-LOGIC-EVM — 支持 14 到 24 引脚 PW、DB、D、DW、NS、DYY 和 DGV 封装的通用逻辑 EVM

该 EVM 设计用于支持采用 14 至 24 引脚 D、DW、DB、NS、PW、DYY 或 DGV 封装的任何逻辑器件。