XR17V352IB-0A-EVB Datasheet, PDF (6/64 Pages) Exar Corporation – HIGH PERFORMANCE DUAL PCI EXPRESS UART

XR17V352
HIGH PERFORMANCE DUAL PCI EXPRESS UART
PIN DESCRIPTIONS
REV. 1.0.4
NAME
PIN #
BUCK REGULATOR SIGNALS
ENABLE
C10
LX
A9
LX
A10
FB
C7
TYPE
DESCRIPTION
I Logic ’1’ enables, logic ’0’ disables buck regulator output.
O Output of internal buck regulator. Use 4.7 uH inductor and connect to FB pin
O ^{as shown in Figure 3.}
I Buck regulator feedback. Decouple with 47uF capacitor and connect to LX
pins through 4.7 uH inductor as shown in Figure 3.
PWRGD
D9
ANCILLARY SIGNALS
RESET#
J5
TMRCK
A6
EN485#
C6
ENIR#
B6
TEST0
TEST1
TEST2
TEST3
TEST4#
TEST5
VCC33
VCC33A
VCC33P
VCC33B
VCC12
VCC12A
D2
B7
A7
D10
E10
E9
D5, E8, H7
H3
B9, C9
B10, B11
D7, G8, H5
H2
O Indicates that 1.2V core has been powered up.
I System reset (active low). In normal operation, this signal should be HIGH.
I 16-bit timer/counter external clock input.
I Auto RS-485 mode enable (active low). This pin is sampled during power up,
following a hardware reset (RST#) or soft reset (register RESET). It can be
used to start up both UARTs in the Auto RS-485 Half-Duplex Direction control
mode. The sampled logic state is transferred to FCTR bit-5 in the UART
channel.
I Infrared mode enable (active low). This pin is sampled during power up, fol-
lowing a hardware reset (RST#) or soft-reset (register RESET). It can be
used to start up both UARTs in the infrared mode. The sampled logic state is
transferred to MCR bit-6 in the UART.
I Factory Test Modes. For normal operation, connect to GND.
I
I
I
I Factory Test Mode 4. For normal operation, connect to VCC.
I/O Factory Test I/O. For normal operation, connect to pull-down resistor.
Pwr 3.3V I/O power supply.
Pwr 3.3V analog PHY power supply. A ferrite bead is recommended on this pin.
Pwr 3.3V power supply voltage for output stage of buck regulator.
Pwr 3.3V power supply for the analog blocks of the buck regulator.
Pwr 1.2V core power supply. A ferrite bead is recommended on these pins.
Pwr 1.2V analog PHY power supply. A ferrite bead is recommended on this pin.
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