![](http://datasheet.mmic.net.cn/Exar-Corporation/XR17V354IB176-F_datasheet_100075/XR17V354IB176-F_7.png)
XR17V354
7
REV. 1.0.3
HIGH PERFORMANCE QUAD PCI-EXPRESS UART
NOTE: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain, OT=Output Tristate, IS=Input Schmitt
Trigger.
TMRCK
A10
I
16-bit timer/counter external clock input.
EN485#
C10
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 all 4 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.
ENIR#
B10
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 all 4 UARTs in the infrared mode. The sampled logic state is
transferred to MCR bit-6 in the UART.
TEST0
TEST1
TEST2
F2
B11
A11
I
Factory Test Modes. For normal operation, connect to GND.
VCC33
D5, D9, E12,
J12, M7
Pwr
3.3V I/O power supply.
VCC33A
K3
Pwr
3.3V analog PHY power supply. A ferrite bead is recommended on this pin.
VCC33P
B13, C13
Pwr
3.3V power supply voltage for output stage of buck regulator.
VCC33B
B14, B15
Pwr
3.3V power supply for the analog blocks of the buck regulator.
VCC12
D7, D11, E4,
G12, K4, L12,
M9
Pwr
1.2V core power supply. A ferrite bead is recommended on these pins.
VCC12A
K2
Pwr
1.2V analog PHY power supply. A ferrite bead is recommended on this pin.
GND
A4, A8, A12,
B12, C12, D4,
D6, D8, D10,
D12, F1, F4,
F12, G3, H1,
H2, H12, H15,
J3, J4, K1, K12,
L4, M1, M6,
M8, M10, M15,
R4, R8, R12
Pwr
Power supply common, ground.
NC
A1, A2, A3, A5,
A6, A15, B1,
B2, B3, B4, B5,
B6, C2, C3, C4,
C5, C6, D3,
M11, N9, N10,
N11, N12, P7,
P8, P9, P10,
P11, P12, R1,
R7, R9, R10,
R11, R13, R15
-
No internal connection.
PIN DESCRIPTIONS
NAME
PIN #TYPE
DESCRIPTION