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XR16V2651 Datasheet(PDF) 6 Page - Exar Corporation |
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XR16V2651 Datasheet(HTML) 6 Page - Exar Corporation |
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6 / 51 page  XR16V2651 6 HIGH PERFORMANCE DUART WITH 32-BYTE FIFO AND POWERSAVE FEATURE REV. 1.0.2 Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain. 16/68# 17 24 I Intel or Motorola Bus Select. 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 Motorola bus type of interface. CLKSEL - 25 I Baud-Rate-Generator Input Clock Prescaler Select for channel A and B. This input is only sampled during power up or a reset. Connect to VCC for divide by 1 and GND for divide by 4. MCR[7] can override the state of this pin following a reset or initialization. See MCR bit-7 and Figure 5 in the Baud Rate Generator section. RESET (RESET#) 24 36 I When 16/68# pin is HIGH for Intel bus interface, this input becomes RESET (active high). When 16/68# pin is LOW for Motorola bus interface, this input becomes RESET# (active low). A 40 ns minimum active pulse on this pin will reset the internal registers and all out- puts of channel A and B. The UART transmitter output will be held HIGH, the receiver input will be ignored and outputs are reset during reset period (see Table 16). VCC 26 42 Pwr 2.25V to 3.6V power supply. All input pins are 5V tolerant. GND 13 17 Pwr Power supply common, ground. GND Center Pad N/A Pwr The center pad on the backside of the 32-QFN package is metallic and should be connected to GND on the PCB. The thermal pad size on the PCB should be the approximate size of this center pad and should be solder mask defined. The solder mask opening should be at least 0.0025" inwards from the edge of the PCB ther- mal pad. NC - 37 - No connection. Pin Description NAME 32-QFN PIN # 48-TQFP PIN # TYPE DESCRIPTION |
Similar Part No. - XR16V2651 |
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Similar Description - XR16V2651 |
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