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ST16C554 Dataheets PDF



Part Number ST16C554
Manufacturers Exar Corporation
Logo Exar Corporation
Description QUAD UART WITH 16-BYTE FIFOS
Datasheet ST16C554 DatasheetST16C554 Datasheet (PDF)

ST16C554/554D ST68C554 QUAD UART WITH 16-BYTE FIFO’S 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 di.

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ST16C554/554D ST68C554 QUAD UART WITH 16-BYTE FIFO’S 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 TQFP, and 68 pin PLCC packages. The 68 pin PLCC package offer 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. PLCC Package INTSEL -CDD 61 60 59 58 57 56 55 54 -CDA GND VCC RXD 63 RXA -RID 62 -RIA D7 D6 D5 D4 D3 D2 D1 67 68 66 D0 65 -DSRA -CTSA -DTRA VCC -RTSA INTA -CSA TXA -IOW TXB -CSB INTB -RTSB GND -DTRB -CTSB -DSRB 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 64 9 8 7 6 5 4 3 2 1 -DSRD -CTSD -DTRD GND -RTSD INTD -CSD TXD -IOR TXC -CSC INTC -RTSC VCC -DTRC -CTSC -DSRC ST16C554DCJ68 16 MODE 53 52 51 50 49 48 47 46 45 44 -CDB RXB VCC RXC -RIC -RXRDY -TXRDY 16/-68 RESET XTAL1 XTAL2 • 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 ORDERING INFORMATION Part number ST16C554DCJ68 ST16C554DCQ64 ST16C554CQ64 ST16C554DIJ68 ST16C554DIQ64 68 64 64 68 64 Pins PLCC TQFP TQFP PLCC TQFP Package Operating temperature 0° C to + 70° C 0° C to + 70° C 0° C to + 70° C -40° C to + 85° C -40° C to + 85° C Rev. 3.10 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017 -CDC A2 A1 A0 GND -RIB FEATURES 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 61 60 59 58 57 56 55 54 GND VCC RXD 63 RXA -RID 62 N.C. 65 D7 D6 D5 D4 D3 D2 D1 67 D0 66 68 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 -DSRA -CTSA -DTRA VCC -RTSA INTA -CSA TXA -IOW -TXB -CSB INTB -RTSB GND -DTRB -CTSB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 48 47 46 45 44 43 42 -DSRD -CTSD -DTRD GND -RTSD INTD -CSD TXD -IOR TXC -CSC INTC -RTSC VCC -DTRC -CTSC -DSRA -CTSA -DTRA VCC -RTSA -IRQ -CS TXA R/-W TXB A3 N.C. -RTSB GND -DTRB -CTSB -DSRB 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 64 9 8 7 6 5 4 3 2 1 -DSRD -CTSD -DTRD GND -RTSD N.C. N.C. TXD N.C. TXC A4 N.C. -RTSC VCC -DTRC -CTSC -DSRC ST16C554CQ64 ST16C554DCQ64 41 40 39 38 37 36 35 34 33 ST16C554DCJ68 68 MODE 53 52 51 50 49 48 47 46 45 44 VCC GND RXC RESET -DSRC -DSRB XTAL1 XTAL2 -CDC RXB -RIB A2 A1 A0 -CDB -RIC -CDB RXB VCC RXC -RIC -RXRDY -TXRDY 16/-68 -RESET XTAL1 XTAL2 Rev. 3.10 2 -CDC A2 A1 A0 GND -RIB ST16C554/554D/68C554 Figure 2, Block Diagram 16 Mode D0-D7 -IOR -IOW RESET Data bus & Control Logic Transmit FIFO Registers Transmit Shift Register TX A-D Inter Connect Bus Lines & Control signals A0-A2 -CS A-D Receive FIFO Registers Receive Shift Register Register Select Logic RX A-D INTSEL Interrupt Control Logic INT A-D -RXRDY -TXRDY -DTR A-D -RTS A-D Clock & Baud Rate Generator Modem Control Logic -CTS A-D -RI A-D -CD A-D -DSR A-D XTAL1 XTAL2 Rev. 3.10 3 ST16C554/554D/68C554 Figure 3, Block Diagram 68 Mode D0-D7 R/-W -RESET Data bus & Control Logic Transmit FIFO Registers Transmit Shift Register TX A-D A0-A4 -CS Inter Connect Bus Lines & Control signals Receive FIFO Registers Receive Shift Register Register Select Logic RX A-D -IRQ -RXRDY -TXRDY Interrupt Control Logic -DTR A-D -RTS A-D Modem Control Logic -CTS A-D -RI A-D -CD A-D -DSR A-D XTAL1 XTAL2 Rev. 3.10 4 Clock & Baud Rate Generator ST16C554/554D/68C554 SYMBOL DESCRIPTION Symbol 16/-68 68 31 Pin 64 - Signal type I Pin Description 16/68 Interface Type Select (input with internal pull-up). This input provides the 16 (Intel) or 68 (Motorola) bus interface type select. The functions of -IOR, -IOW, INT AD, and -CS A-D are re-assigned with the logical state of this pin. When this pin is a logic 1, the 16 mode interface 16C554D is selected. When this pin is a logic 0, the 68 mode interface (68C554) is .


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