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XR16M564IJ68 Datasheet(PDF) 4 Page - Exar Corporation |
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XR16M564IJ68 Datasheet(HTML) 4 Page - Exar Corporation |
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4 / 55 page  XR16M564/564D 4 1.62V TO 3.63V QUAD UART WITH 32-BYTE FIFO REV. 1.0.0 PIN DESCRIPTIONS ORDERING INFORMATION PART NUMBER PACKAGE OPERATING TEMPERATURE RANGE DEVICE STATUS XR16M564IJ68 68-Lead PLCC -40°C to +85°C Active XR16M564IV64 64-Lead LQFP -40°C to +85°C Active XR16M564DIV64 64-Lead LQFP -40°C to +85°C Active XR16M564IL48 48-pin QFN -40°C to +85°C Active XR16M564IV80 80-Lead LQFP -40°C to +85°C Active Pin Description NAME 48-QFN PIN # 64-LQFP PIN # 68-PLCC PIN # 80-LQFP PIN # TYPE DESCRIPTION DATA BUS INTERFACE A2 A1 A0 15 16 17 22 23 24 32 33 34 46 47 48 I Address data lines [2:0]. These 3 address lines select one of the internal registers in UART channel A-D dur- ing a data bus transaction. D7 D6 D5 D4 D3 D2 D1 D0 46 45 44 43 42 41 40 39 60 59 58 57 56 55 54 53 5 4 3 2 1 68 67 66 15 14 13 12 11 9 8 7 I/O Data bus lines [7:0] (bidirectional). IOR# (VCC) 29 40 52 70 I When 16/68# pin is HIGH, the Intel bus interface is selected and this input becomes read strobe (active low). The falling edge instigates an internal read cycle and retrieves the data byte from an internal register pointed by the address lines [A2:A0], puts the data byte on the data bus to allow the host processor to read it on the rising edge. When 16/68# pin is LOW, the Motorola bus interface is selected and this input is not used and should be con- nected to VCC. IOW# (R/W#) 7 9 18 31 I When 16/68# pin is HIGH, it selects Intel bus interface and this input becomes write strobe (active low). The falling edge instigates the internal write cycle and the rising edge transfers the data byte on the data bus to an internal register pointed by the address lines. When 16/68# pin is LOW, the Motorola bus interface is selected and this input becomes read (logic 1) and write (LOW) signal. CSA# (CS#) 5 7 16 28 I When 16/68# pin is HIGH, this input is chip select A (active low) to enable channel A in the device. When 16/68# pin is LOW, this input becomes the chip select (active low) for the Motorola bus interface. |
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