ST16C554D
Quad UART with 16-Byte FIFOs

Features

  • Compatibility with the Industry Standard ST16C454, ST68C454, ST68C554, TL16C554
  • 1.5 Mbps transmit/receive operation (24MHz)
  • 16 byte transmit FIFO
  • 16 byte receive FIFO with error flags
  • Independent transmit and receive control
  • Software selectable Baud Rate Generator
  • Four selectable Receive FIFO interrupt trigger levels
  • Standard modem interface
  • Pb-Free, RoHS Compliant Versions Offered
Applications

  • Portable Appliances
  • Telecommunication Network Routers
  • Ethernet Network Routers
  • Cellular Data Devices
  • Factory Automation and Process Controls
Description

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 user with error indications and operational status, modem interface control. System interrupts may be tailored to meet user requirements. An internal loopback capability allows onboard diagnostics.

The 554D is available in 64 pin LQFP and 68 pin PLCC packages. The 68 pin PLCC package offers an additional 68 mode which allows easy integration with Motorola and other popular microprocessors. The ST16C554CQ64 (64 pin) offers three state interrupt control while the ST16C554DCQ64 provides constant active interrupt outputs. The 64 pin devices do not offer TXRDY/ RXRDY outputs. The 554D combines the package interface modes of the 16C554 and 68C554 series on a single integrated chip.

For UART technical support or to obtain an IBIS model for this product, please email Exar's UART Technical Support group.
Part NumberPkg CodeRoHSMin
Temp.
(°C)		Max
Temp.
(°C)		StatusBuy NowOrder Samples
ST16C554DCJ68-FPLCC68PLCC68070Active
ST16C554DCQ64-FLQFP64LQFP64070Active
ST16C554DIJ68-FPLCC68PLCC68-4085Active
ST16C554DIQ64-FLQFP64LQFP64-4085Active

Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs. 
Specifications
CH4
CPUInterfaceIntel or Motorola
Data Rate@5/3.3/2.5V1.5/0.5/na
Tx/RxFIFO(Bytes)16/16
Tx/RxFIFOCtrsNo
Tx/RxFIFOINT TrigNo/ 4 Levels
AutoRTS/CTSNo
IrDaSupNo
5VTolInputsNo
Sup V2.97-5.5
PkgsPLCC-68, LQFP-64
Documents
Datasheets
Datasheet
Version 4.0.1
June 2006
756.22 KB
Application Notes
DAN-107, Interfacing 16Cxxx UARTs to a CPU
Version 1.0.0
August 1999
32.43 KB
DAN-108, UART Crystal Oscillator Design Guide
Version 1.0.0
March 2000
58.16 KB
DAN-133, EXAR's ST16C554 vs TL16C554
Version 1.0.0
April 2002
94.42 KB
DAN-134, EXAR's ST16C654 vs. TL16C754B
Version 1.0.0
June 2002
72.50 KB
General UART Application Note
Version 1.0.0
December 1996
39.81 KB
Schematics
ISA Eval Board Schematic
Version 1.1.0
September 2007
187.38 KB
Manuals
Evaluation Board User's Manual
Version 2.0.0
August 2003
17.28 KB