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XR16V654IJ Datasheet(PDF) 9 Page - Exar Corporation |
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XR16V654IJ Datasheet(HTML) 9 Page - Exar Corporation |
9 / 58 page XR16V654/654D 9 REV. 1.0.1 2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO DSRA# DSRB# DSRC# DSRD# - - - - 1 17 32 48 10 26 44 60 3 19 43 59 7 23 58 74 I UART channels A-D Data-Set-Ready (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. CDA# CDB# CDC# CDD# - - - - 64 18 31 49 9 27 43 61 79 23 39 63 99 32 49 83 I UART channels A-D Carrier-Detect (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. RIA# RIB# RIC# RID# - - - - 63 19 30 50 8 28 42 62 78 24 38 64 98 33 48 84 I UART channels A-D Ring-Indicator (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. ANCILLARY SIGNALS XTAL1 18 25 35 31 40 I Crystal or external clock input. Caution: this input is not 5V tolerant. XTAL2 19 26 36 32 41 O Crystal or buffered clock output. 16/68# 14 - 31 - 36 I Intel or Motorola Bus Select (input with internal pull-up). When 16/68# pin is HIGH, 16 or Intel Mode, the device will operate in the Intel bus type of interface. When 16/68# pin is LOW, 68 or Motorola mode, the device will operate in the Motor- ola bus type of interface. Motorola bus interface is not available on the 64 pin package. CLKSEL - 21 30 26 35 I Baud-Rate-Generator Input Clock Pres- caler Select for channels A-D. This input is only sampled during power up or a reset. Connect to VCC for divide by 1 (default) and GND for divide by 4. MCR[7] can over- ride the state of this pin following a reset or initialization. See MCR bit-7 and Figure 7 in the Baud Rate Generator section. CHCCLK - - - - 42 I This input provides the clock for UART channel C. An external 16X baud clock or the crystal oscillator’s output, XTAL2, must be connected to this pin for normal opera- tion. This input may also be used with MIDI (Musical Instrument Digital Interface) appli- cations when an external MIDI clock is pro- vided. This pin is only available in the 100- pin QFP package. Pin Description NAME 48-QFN PIN # 64-LQFP PIN # 68-PLCC PIN# 80-LQFP PIN # 100-QFP PIN # TYPE DESCRIPTION |
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