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XR16C2852CJ Datasheet(PDF) 5 Page - Exar Corporation |
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XR16C2852CJ Datasheet(HTML) 5 Page - Exar Corporation |
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5 / 51 page  xr XR16C2852 REV. 2.1.1 2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS 5 NOTE: Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain. RTSB# 23 O UART channel B Request-to-Send (active low) or general purpose output. This port must be asserted prior to using auto RTS flow control, see EFR[6], MCR[1], FCTR[1:0], EMSR[5:4] and IER[6]. For auto RS485 half-duplex direction control, see FCTR[3]. If this output is not used, leave it unconnected. CTSB# 28 I UART channel B Clear-to-Send (active low) or general purpose input. It can be used for auto CTS flow control, see EFR[7], and IER[7]. This input should be connected to VCC when not used. DTRB# 27 O UART channel B Data-Terminal-Ready (active low) or general purpose output. If this output is not used, leave it unconnected. DSRB# 29 I UART channel B Data-Set-Ready (active low) or general purpose input. This input should be connected to VCC when not used. CDB# 30 I UART channel B Carrier-Detect (active low) or general purpose input. This input should be connected to VCC when not used. RIB# 31 I UART channel B Ring-Indicator (active low) or general purpose input. This input should be connected to VCC when not used. MFB# 19 O Multi-Function Output Channel B. This output pin can function as the OP2B#, BAUD- OUTB#, or RXRDYB# pin. One of these output signal functions can be selected by the user programmable bits 1-2 of the Alternate Function Register (AFR). These sig- nal functions are described as follows: 1) OP2B# - When OP2B# (active low) is selected, the MF# pin is LOW when MCR bit- 3 is set to a logic 1 (see MCR bit-3). MCR bit-3 defaults to a logic 0 condition after a reset or power-up. 2) BAUDOUTB# - When BAUDOUTB# function is selected, the 16X Baud rate clock output is available at this pin. 3) RXRDYB# - RXRDYB# (active low) is intended for monitoring DMA data transfers. See Table 2 on page 9 for more details. If this output is not used, leave it unconnected. ANCILLARY SIGNALS XTAL1 11 I Crystal or external clock input. XTAL2 13 O Crystal or buffered clock output. RESET 21 I Reset (active high) - A longer than 40 ns 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 (see Table 16 on page 38). VCC 44, 33 Pwr 2.97V to 5.5V power supply. All inputs are 5V tolerant for devices with top mark date code of "F2 YYWW" and newer. GND 22, 12 Pwr Power supply common, ground. Pin Description NAME 44-PLCC PIN # TYPE DESCRIPTION |
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