SC28L198

General description

The Philips 28L198 Octal UART is a single chip CMOS-LSI communications device that provides 8 full-duplex asynchronous channels with significantly deeper 16 byte FIFOs, Automatic in-band flow control using Xon/Xoff characters defined by the user and address recognition in the wake up mode. Synchronous bus interface is used for all communication between host and OCTART. It is fabricated using Philips 1.0 micron CMOS technology that combines the benefits of low cost, high density and low power consumption.

The operating speed of each receiver and transmitter can be selected independently from one of 22 fixed baud rates, a 16X clock derived from one of two programmable baud rate counters or one of three external 16X clocks (1 available at 1x clock rate). The baud rate generator and counter can operate directly from a crystal or from seven other external or internal clock inputs. The ability to independently program the operating speed of the receiver and transmitter makes the Octal UART particularly attractive for dual speed full duplex channel applications such as clustered terminal systems. The receivers and transmitters are buffered with FIFOs of 16 characters to minimize the potential for receiver overrun and to reduce interrupt overhead. In addition, a handshaking capability and in-band flow control are provided to disable a remote UART transmitter when the receiver buffer is full or nearly so.

To minimize interrupt overhead an interrupt arbitration system is included which reports the context of the interrupting UART via direct access or through the modification of the interrupt vector. The context of the interrupt is reported as channel number, type of device interrupting (receiver COS etc.) and, for transmitters or receivers, the fill level of the FIFO.

The Octal UART provides a power down mode in which the oscillator is stopped but the register contents are maintained. This results in reduced power consumption of several orders of magnitudes. The Octal UART is fully TTL compatible when operating from a single +5V power supply. Operation at 3.3 volts is maintained with CMOS interface levels.

The device also offered in a version which maintains TTL input and output levels while operating with a 3.3 volt power supply.

Features

• Single 3.3V and 5V power supply
• Eight Philips industry standard full duplex UART channels
• Sixteen byte receiver FIFOs for each UART
• Sixteen byte transmit FIFOs for each UART
• In band flow control using programmable Xon/Xoff characters
• Flow control using CTSN RTSN hardware handshaking
• Automatic address detection in multi-drop mode
• Three byte general purpose character recognition
• Fast data bus, 30 ns data bus release time, 125 ns bus cycle time
• Programmable interrupt priorities
• Automatic identification of highest priority interrupt pending
• Global interrupt and control registers ease setup and interrupt handling
• Vectored interrupts with programmable interrupt vector formats
• • Interrupt vector modified with channel number
  • Interrupt vector modified with channel number and channel type
  • Interrupt vector not modified
• IACKN and DACKN signal pins
• Watch dog timer for each receiver (64 receive clock counts)
• Programmable Data Formats:
• • 5 to 8 data bits plus parity
  • Odd, even force or no parity
  • 1, 1.5 or 2 stop bits
• Flexible baud rate selection for receivers and transmitters:
• • 22 fixed rates; 50 - 230.4K baud or 100 to 460.8K baud
  • Additional non-standard rates to 500K baud with internal generators
  • Two reload-counters provide additional programmable baud rate generation
  • External 1x or 16x clock inputs
  • Simplified baud rate selection
• 1 MHz 1x and 16x data rates full duplex all channels.
• Parity, framing and overrun error detection
• False start bit detection
• Line break detection and generation
• Programmable channel mode
• • Normal(full duplex)
  • Diagnostic modes
  • • automatic echo
    • local loop back
    • remote loop back
  • Four I/O ports per UART for modem controls, clocks, RTSN, I/O etc.
  • • All I/O ports equipped with "Change of State Detectors"
  • Two global inputs and two global outputs for general purpose I/O
  • Power down mode
  • On chip crystal oscillator, 2-8 MHz
  • TTL input levels. Outputs switch between full V_CC and V_SS
  • High speed CMOS technology
  • 84 pin PLCC
  • 100 pin LQFP

Products/packages

Type number	Orderable part number	Ordering code (12NC)	Product status	Package	Packing	Marking	ECCN
SC28L198A1A	SC28L198A1A,512	9352 613 23512	Volume production	SOT189-2 (PLCC84)	Tube Dry Pack	Standard Marking
SC28L198A1A	SC28L198A1A,518	9352 613 23518	Volume production	SOT189-2 (PLCC84)	Reel Dry Pack, SMD, 13"	Standard Marking
SC28L198A1A	SC28L198A1A,529	9352 613 23529	Volume production	SOT189-2 (PLCC84)
SC28L198A1A/G	SC28L198A1A/G,518	9352 793 34518	Volume production	SOT189-2 (PLCC84)	Reel Dry Pack, SMD, 13"	Standard Marking
SC28L198A1BE	SC28L198A1BE,528	9352 627 31528	Volume production	SOT407-1 (LQFP100)	Reel Dry Pack, SMD, 13",Turned	Standard Marking
SC28L198A1BE	SC28L198A1BE,551	9352 627 31551	Volume production	SOT407-1 (LQFP100)	Tray Dry Pack, Bakeable, Single	Standard Marking
SC28L198A1BE	SC28L198A1BE,557	9352 627 31557	Volume production	SOT407-1 (LQFP100)	Tray Dry Pack, Bakeable, Multiple	Standard Marking

Quality/reliability/chemical content

Type number	Orderable part number	Chemical content	RoHS	Leadfree Conversion date	RHF	IRF (FIT)	MTBF (hours)	MSL
SC28L198A1A	SC28L198A1A,512	SC28L198A1A		week 8, 2005
SC28L198A1A	SC28L198A1A,518	SC28L198A1A		week 8, 2005
SC28L198A1A	SC28L198A1A,529	SC28L198A1A		week 8, 2005
SC28L198A1A/G	SC28L198A1A/G,518	SC28L198A1A_G		Always Pb-free
SC28L198A1BE	SC28L198A1BE,528	SC28L198A1BE		week 21, 2004
SC28L198A1BE	SC28L198A1BE,551	SC28L198A1BE		week 21, 2004
SC28L198A1BE	SC28L198A1BE,557	SC28L198A1BE		week 21, 2004

Quality and reliability disclaimer

Pricing/ordering/availability

Type number	Ordering code(12NC)	Orderable part number	Indicative price/unit($)	Region	Distributor	In stock	Order quantity	Inventory date	Buy online	Samples
SC28L198A1A	9352 613 23512	SC28L198A1A,512	35.4500	NA	MOUSER ELECTRONICS	140		11/20/2009	Buy online	Order samples
				NA	MOUSER ELECTRONICS	140		11/20/2009	Buy online
				NA	AVNET ELECTRONICS MARKETING	293		11/19/2009	Buy online
SC28L198A1A	9352 613 23518	SC28L198A1A,518	35.4500							not available
SC28L198A1A	9352 613 23529	SC28L198A1A,529	35.4500	NA	AVNET ELECTRONICS MARKETING	10		11/19/2009	Buy online	not available
SC28L198A1A/G	9352 793 34518	SC28L198A1A/G,518								Order samples
SC28L198A1BE	9352 627 31528	SC28L198A1BE,528	35.4500	NA	MOUSER ELECTRONICS	10		11/20/2009	Buy online	Order samples
				NA	ARROW ELECTRONICS	1,350		11/19/2009	Buy online
				NA	MOUSER ELECTRONICS	10		11/20/2009	Buy online
SC28L198A1BE	9352 627 31551	SC28L198A1BE,551	35.4500	NA	ARROW ELECTRONICS	1,350		11/19/2009	Buy online	not available
SC28L198A1BE	9352 627 31557	SC28L198A1BE,557	35.4500	NA	ARROW ELECTRONICS	1,350		11/19/2009	Buy online	not available
				NA	DIGI-KEY CORPORATION	425		11/20/2009	Buy online

Applications

Uses

Statistical Multiplexers
Data Concentrators
     Packet-switching networks
     Process Control
     Building or Plant Control
     Laboratory data gathering
     ISDN front ends
     Computer Networks
     Point-of-Sale terminals
Automotive, cab and engine controls
Entertainment systems
     MIDDI keyboard control music systems
     Theater lighting control
Terminal Servers
     Computer-Printer/Plotter links

Related applications
LCD TV - MMS functionality
Set-top box - MMS functionality

Design support

Application Notes

Support Documents

Parametrics/similar products

Type number	Package	Application	FUNCTION	Operating temp.(Cel)	No. of Pins	Receiver/Transmitter Type
SC28L198A1A	SOT189-2 (PLCC84)	Data Communication	Receivers/Transmitters	-40~85	84	Octal UARTs
SC28L198A1A/G	SOT189-2 (PLCC84)	Data Communication	Receivers/Transmitters	-40~85	84	Octal UARTs
SC28L198A1BE	SOT407-1 (LQFP100)	Data Communication	Receivers/Transmitters	-40~85	100	Octal UARTs

Similar products
SC28L198 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer