ST16C554 fifos equivalent, quad uart with 16-byte fifos.
ST16C554/554D/68C554
Figure 1, Package Descriptions
64 Pin TQFP Package
-CDD -CDA GND -CDA VCC RXD RXA -RID -RIA -RIA D7 D6 D5 D4 D3 D2 D1 D0
68 Pin PLCC Package
-CDD.
The ST16C554D is a universal asynchronous receiver and transmitter (UART) with a dual foot print interface. The 554D is an enhanced UART with 16 byte FIFOs, receive trigger levels and data rates up to 1.5Mbps. Onboard status registers provide the use.
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