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XR16V794 Datasheet(PDF) 5 Page - Exar Corporation |
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XR16V794 Datasheet(HTML) 5 Page - Exar Corporation |
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5 / 53 page  XR16V794 5 REV. 1.0.1 HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE NOTE: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain. TX3 28 O UART channel 3 Transmit Data or infrared transmit data. Normal TXD output idles HIGH while infrared TXD output idles LOW. RX3 21 I UART channel 3 Receive Data or infrared receive data. Normal RXD input idles HIGH while infrared RXD input idles LOW. In the infrared mode, the polarity of the incoming RXD signal can be selected via FCTR bit-4. If this bit is a logic 0, a LOW on the RXD input is considered a mark and if this bit is a logic 1, a HIGH on the RXD input is considered a space. RTS3# 26 O UART channel 3 Request to Send or general purpose output (active low). See description of RTS0# pin. CTS3# 22 I UART channel 3 Clear to Send or general purpose input (active low).d. See description of CTS0# pin. DTR3# 27 O UART channel 3 Data Terminal Ready or general purpose output (active low). See description of DTS0# pin. DSR3# 23 I UART channel 3 Data Set Ready or general purpose input (active low). See description of DSR0# pin. CD3# 24 I UART channel 3 Carrier Detect or general purpose input (active low). RI3# 25 I UART channel 3 Ring Indicator or general purpose input (active low). ANCILLARY SIGNALS XTAL1 50 I Crystal or external clock input. Caution: this input is not 5V tolerant. XTAL2 49 O Crystal or buffered clock output. TMRCK 31 I 16-bit timer/counter external clock input. ENIR 32 I Infrared mode enable (active high). This pin is sampled during power up, following a hardware reset (RST#) or soft-reset (register RESET). It can be used to start up all 4 UARTs in the infrared mode. The sampled logic state is transferred to MCR bit- 6 in the UART. RST# 20 I Reset (active low). The configuration and UART registers are reset to default val- ues, see Table 19. 16/68# 19 I Intel or Motorola data bus interface select. HIGH selects Intel bus interface and LOW selects Motorola interface. This input affects the functionality of IOR#, IOW# and CS# pins. VCC 9,30,52 +2.25V to 3.6V supply with 5V tolerant serial (modem) inputs. GND 10,29,51 Power supply common, ground. NAME PIN #TYPE DESCRIPTION |
Similar Part No. - XR16V794_08 |
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Similar Description - XR16V794_08 |
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