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XR16V654DIV Datasheet(PDF) 6 Page - Exar Corporation |
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XR16V654DIV Datasheet(HTML) 6 Page - Exar Corporation |
6 / 58 page XR16V654/654D 6 2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO REV. 1.0.1 IOW# (R/W#) 7 9 18 11 15 I When 16/68# pin is HIGH, it selects Intel bus interface and this input becomes write strobe (active low). The falling edge insti- gates 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 (logic 0) signal. CSA# (CS#) 5 7 16 9 13 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. CSB# (A3) 9 11 20 13 17 I When 16/68# pin is HIGH, this input is chip select B (active low) to enable channel B in the device. When 16/68# pin is LOW, this input becomes address line A3 which is used for channel selection in the Motorola bus inter- face. CSC# (A4) 27 38 50 49 64 I When 16/68# pin is HIGH, this input is chip select C (active low) to enable channel C in the device. When 16/68# pin is LOW, this input becomes address line A4 which is used for channel selection in the Motorola bus inter- face. CSD# (VCC) 31 42 54 53 68 I When 16/68# pin is HIGH, this input is chip select D (active low) to enable channel D in the device. When 16/68# pin is LOW, this input is not used and should be connected VCC. INTA (IRQ#) 4 6 15 8 12 O (OD) When 16/68# pin is HIGH for Intel bus inter- face, this ouput becomes channel A inter- rupt output. The output state is defined by the user and through the software setting of MCR[3]. INTA is set to the active mode when MCR[3] is set to a logic 1. INTA is set to the three state mode when MCR[3] is set to a logic 0 (default). See MCR[3]. When 16/68# pin is LOW for Motorola bus interface, this output becomes device inter- rupt output (active low, open drain). An external pull-up resistor is required for proper operation. Pin Description NAME 48-QFN PIN # 64-LQFP PIN # 68-PLCC PIN# 80-LQFP PIN # 100-QFP PIN # TYPE DESCRIPTION |
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