XR16L570 Datasheet, PDF (46/46 Pages) Exar Corporation – SMALLEST 1.62V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE

XR16L570
SMALLEST 1.62V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
xr
REV. 1.0.0
4.5 INTERRUPT STATUS REGISTER (ISR) - READ-ONLY ............................................................................... 23
4.5.1 INTERRUPT GENERATION: ...................................................................................................................................... 23
4.5.2 INTERRUPT CLEARING: ........................................................................................................................................... 23
TABLE 7: INTERRUPT SOURCE AND PRIORITY LEVEL ....................................................................................................................... 24
4.6 FIFO CONTROL REGISTER (FCR) - WRITE-ONLY ...................................................................................... 24
TABLE 8: TRANSMIT AND RECEIVE FIFO TRIGGER LEVEL SELECTION .............................................................................................. 25
4.7 LINE CONTROL REGISTER (LCR) - READ/WRITE ...................................................................................... 25
TABLE 9: PARITY SELECTION .......................................................................................................................................................... 26
4.8 MODEM CONTROL REGISTER (MCR) OR GENERAL PURPOSE OUTPUTS CONTROL - READ/WRITE 27
4.9 LINE STATUS REGISTER (LSR) - READ ONLY ........................................................................................... 28
4.10 MODEM STATUS REGISTER (MSR) - READ ONLY .................................................................................. 29
4.11 SCRATCHPAD REGISTER (SPR) - READ/WRITE ..................................................................................... 30
4.12 BAUD RATE GENERATOR REGISTERS (DLL AND DLM) - READ/WRITE .............................................. 30
4.13 DEVICE IDENTIFICATION REGISTER (DVID) - READ ONLY .................................................................... 30
4.14 DEVICE REVISION REGISTER (DREV) - READ ONLY .............................................................................. 30
4.15 ENHANCED FEATURE REGISTER (EFR) ................................................................................................. 30
TABLE 10: SOFTWARE FLOW CONTROL FUNCTIONS ........................................................................................................................ 31
4.16 SOFTWARE FLOW CONTROL REGISTERS (XOFF1, XOFF2, XON1, XON2) - WRITE ONLY ................ 32
TABLE 11: UART RESET CONDITIONS FOR CHANNEL A AND B............................................................................................ 33
ABSOLUTE MAXIMUM RATINGS...................................................................................33
TYPICAL PACKAGE THERMAL RESISTANCE DATA (MARGIN OF ERROR: ± 15%) 33
DC ELECTRICAL CHARACTERISTICS ..............................................................................................................34
DC ELECTRICAL CHARACTERISTICS ..............................................................................................................34
AC ELECTRICAL CHARACTERISTICS ..............................................................................................................35
Unless otherwise noted: TA= -40o to +85oC, Vcc=2.97 - 5.5V, 70 pF load where applicable .................................. 35
AC ELECTRICAL CHARACTERISTICS ..............................................................................................................36
Unless otherwise noted: TA= -40o to +85oC, Vcc=1.62 - 2.75V, 70 pF load where applicable ................................ 36
DATA RATE CHARACTERIZATION AT 5V ..........................................................................................................37
Operating Temperature Range = -40o to +85oC....................................................................................................... 37
DATA RATE CHARACTERIZATION AT 3.3V .......................................................................................................37
Operating Temperature Range = -40o to +85oC....................................................................................................... 37
DATA RATE CHARACTERIZATION AT 2.5V .......................................................................................................37
Operating Temperature Range = -40o to +85oC....................................................................................................... 37
DATA RATE CHARACTERIZATION AT 1.8V .......................................................................................................37
Operating Temperature Range = -40o to +85oC....................................................................................................... 37
FIGURE 14. CLOCK TIMING............................................................................................................................................................. 38
FIGURE 15. MODEM INPUT/OUTPUT TIMING .................................................................................................................................... 38
FIGURE 16. DATA BUS READ TIMING .............................................................................................................................................. 39
FIGURE 17. DATA BUS WRITE TIMING............................................................................................................................................. 39
FIGURE 18. RECEIVE READY INTERRUPT TIMING [NON-FIFO MODE] ............................................................................................... 40
FIGURE 19. TRANSMIT READY INTERRUPT TIMING [NON-FIFO MODE] ............................................................................................. 40
FIGURE 20. RECEIVE READY INTERRUPT TIMING [FIFO MODE] ....................................................................................................... 41
FIGURE 21. TRANSMIT READY INTERRUPT TIMING [FIFO MODE] ..................................................................................................... 41
PACKAGE DIMENSIONS (32 PIN QFN - 5 X 5 X 0.9 MM)..............................................42
PACKAGE DIMENSIONS (24 PIN QFN - 4 X 4 X 0.9 MM)..............................................43
REVISION HISTORY.......................................................................................................................................44
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