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Exar Corporation

XR19L212 Datasheet Preview

XR19L212 Datasheet

TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

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XR19L212
TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
MAY 2007
REV. 1.0.0
GENERAL DESCRIPTION
The XR19L212 (L212) is a highly integrated device that
combines a full-featured two channel Universal
Asynchronous Receiver and Transmitter (UART) and RS-
232 transceivers. The L212 is designed to operate with a
single 3.3V or 5V power supply. The L212 is fully compliant
with EIA/TIA-232-F Standards from a +3.3V to +5.5V power
supply. The device operates at 1 Mbps 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 L212 operates in four different modes: Active, Partial
Sleep, Full Sleep and Power-Save. Each mode can be
invoked via hardware or software. Upon power-up, the
L212 is in the Active mode where the UART and RS-232
transceiver function normally. 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, both
the crystal oscillator and the charge pump are turned off.
While the UART is in the Sleep mode, the Power-Save
mode isolates the core logic from the control signals (chip
select, read/write strobes, address and data bus lines) to
minimize the power consumption. 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 +3.3V to +5.5V
operation
Up to 1 Mbps 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
PwrSave
A2:A0
D7:D0
IOR#
IOW# (R/W#)
CSA# (CS#)
CSB#
INTA (IRQ#)
INTB
RESET (RESET#)
I/M#
RXBSEL
*5 V Tolerant
Inputs
Crystal
Osc/Buffer
BRG
64 Byte
TX & RX
FIFO
Modem
I/Os
TXA
RXA
RTSA#
CTSA#
Channel A
Channel B
UART
XR19L212
CTSB#
RTSB#
TXB
RXB
Charge Pump
5K
5K
VREF+
VREF-
TXDA
RXDA
RTSA
CTSA
Ch A Transceiver
Channel B
Transceiver
(See Figure 6)
RS-232 Transceiver
CTSB
RTSB
TXDB
TXB
RXDB
RXB
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XR19L212 Datasheet Preview

XR19L212 Datasheet

TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

No Preview Available !

XR19L212
TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
FIGURE 2. PIN OUT OF THE DEVICE
REV. 1.0.0
GND 1
CTSB 2
RTSB 3
D5 4
D6 5
D7 6
RXBSEL 7
RXB 8
TXB 9
CSA# 10
CSB# 11
PWRSAVE 12
XR19L212
48- pin QFN
Intel Bus Mode
36 C2P
35 RESET
34 C2N
33 TXDA
32 INTA
31 INTB
30 A0
29 A1
28 A2
27 RXDA
26 GND
25 RXDB
VCC
GND 1
CTSB 2
RTSB 3
D5 4
D6 5
D7 6
RXBSEL 7
RXB 8
TXB 9
CS# 10
A3 11
PWRSAVE 12
XR19L212
48- pin QFN
Motorola Bus Mode
36 C2P
35 RESET#
34 C2N
33 TXDA
32 IRQ#
31 N.C.
30 A0
29 A1
28 A2
27 RXDA
26 GND
25 RXDB
ORDERING INFORMATION
PART NUMBER
PACKAGE
XR19L212IL48
48-pin QFN
GND
OPERATING TEMPERATURE RANGE
-40°C to +85°C
DEVICE STATUS
Active
2


Part Number XR19L212
Description TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
Maker Exar Corporation
Total Page 30 Pages
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