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XR16V654D Datasheet(PDF) 10 Page - Exar Corporation |
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XR16V654D Datasheet(HTML) 10 Page - Exar Corporation |
10 / 58 page XR16V654/654D 10 2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO REV. 1.0.1 Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain. RESET (RESET#) 20 27 37 33 43 I When 16/68# pin is HIGH for Intel bus inter- face, this input becomes the Reset pin (active high). In this case, a 40 ns mini- mum HIGH pulse on this pin will reset the internal registers and all outputs. The UART transmitter output will be held HIGH, the receiver input will be ignored and outputs are reset during reset period (Table 17). When 16/68# pin is at LOW for Motorola bus interface, this input becomes Reset# pin (active low). This pin functions similarly, but instead of a HIGH pulse, a 40 ns mini- mum LOW pulse will reset the internal reg- isters and outputs. Motorola bus interface is not available on the 64 pin package. VCC 2, 24, 37 4, 35, 52 13, 47, 64 6, 46, 66 10, 61, 86 Pwr 2.25V to 3.6V power supply. All inputs, except XTAL1, are 5V tolerant. GND 21, 47 14, 28, 45, 61 6, 23, 40, 57 16, 36, 56, 76 20, 46, 71, 96 Pwr Power supply common, ground. GND Center Pad N/A N/A N/A N/A Pwr The center pad on the backside of the QFN package is metallic and should be con- nected to GND on the PCB. The thermal pad size on the PCB should be the approxi- mate 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 thermal pad. N.C. - - - 1, 2, 20, 21, 22, 27, 40, 41, 42, 60, 61, 62, 80 No Connection. These pins are not used in either the Intel or Motorola bus modes. Pin Description NAME 48-QFN PIN # 64-LQFP PIN # 68-PLCC PIN# 80-LQFP PIN # 100-QFP PIN # TYPE DESCRIPTION |
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