參數(shù)資料
型號： XR19L220IL40-0B-EB
廠商： Exar Corporation
文件頁數(shù)： 1/43頁
文件大小： 0K
描述： EVAL BOARD FOR XR19L202 40QFN
標準包裝： 1
系列： *
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
XR19L220
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
JULY 2007
REV. 1.0.2
GENERAL DESCRIPTION
The XR19L220 (L220) is a highly integrated device that
combines
a
full-featured
single
channel
Universal
Asynchronous Receiver and Transmitter (UART) and an
RS-232 transceiver. The L220 is designed to operate with a
single 3.3V or 5V power supply. The L220 is fully compliant
with EIA/TIA-232-F Standards from a +3.0V to +5.5V power
supply. The device operates at 250 Kbps data rate with
worst case 3K ohms load. Both RS-232 driver outputs and
receiver inputs can operate in harsh electrical environments
of +/-15V without damage and can survive multiple +/-15kV
ESD on the RS-232 lines, while maintaining RS-232 output
levels.
The L220 operates in four different modes: Active, Partial
Sleep, Full Sleep and Power-Save. Each mode can be
invoked via hardware or software. In the Active mode, all
functions are active. In the Partial Sleep mode, the internal
crystal oscillator of the UART or charge pump of the RS-
232 transceiver is turned off. In Full Sleep mode, the
internal crystal oscillator and the charge pump is turned off.
In the Power-Save mode, the core logic is isolated from the
control signals (chip select, read/write strobes, address and
data bus lines) to further reduce the power consumption. All
the RS-232 receivers remain active in any of these four
modes.
APPLICATIONS
Battery-Powered Equipment
Handheld and Mobile Devices
Handheld Terminals
Industrial Peripheral Interfaces
Point-of-Sale (POS) Systems
FEATURES
Meets true EIA/TIA-232-F Standards from +3.0V to +5.5V
operation
Up to 250 Kbps data transmission rate
45us sleep mode exit (charge pump to full power)
ESD protection for RS-232 I/O pins at
■ +/-15kV - Human Body Model
■ +/-15kV - IEC 61000-4-2, Air-Gap Discharge
■ +/- 8kV - IEC 61000-4-2, Contact Discharge
Software compatible with industry standard 16550 UART
Intel/Motorola bus select
Complete modem interface
Sleep and Power-save modes to conserve battery power
Wake-up interrupt upon exiting low power modes
FIGURE 1. BLOCK DIAGRAM
XR19L220
UART
RS-232 Transceiver
Int
e
lor
Motor
o
la
B
u
s
I
n
te
rface
PwrSave
A2:A0
D7:D0
IOR#
IOW# (R/W#)
CS#
INT (IRQ#)
RESET (RESET#)
I/M#
Crystal
Osc/Buffer
XT
A
L
1
XT
A
L
2
BRG
16 Byte
TX FIFO
16 Byte
RX FIFO
Modem
I/Os
UART
R
e
gisters
TX
RX
RTS#
DTR#
CTS#
DSR#
RI#
CD#
Charge Pump
TXD
RTS
DTR
5K
RXD
5K
CTS
5K
DSR
5K
RI
5K
CD
AC
P
C2+
C2-
C1+
C1-
VC
C
(3
.0
t
o
5.5
V
)
*5 V
Tolerant
Inputs
GND
VREF+
VREF-
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