August 2012
FXLA2203
Dual-Mode, Dual-SIM-Card Level Translator
Description
Features
The FXLA2203 allows either two hosts to
simultaneously communicate with two Subscriber
Identity Modules (SIM), or two User Identity Modules
(UIM). Dual Mode refers to the mobile phones that are
compatible with more than one form of data
transmission or network (such as GSM, CDMA,
WCDMA, TDSCDMA, or CDMA2000), resulting in a
dual-baseband processor configuration. In a dual-mode
application, the FXLA2203 host ports interface directly
with the baseband processors (see Figure 9).
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Easy-to-Use “Single Pin” SIM Card Swap Control
Channel Swap Time: 130ns (Typical)
Simultaneous Dual-Mode, Dual-SIM Communication
Host Ports: 1.65V to 3.6V Voltage Translation
Card Ports: 1.65V to 3.6V Voltage Translation
Leverages the Presence of Existing PMIC LDOs
ISO7816 Compliant
The bi-directional I/O open-drain channel features auto-
direction and internal 10KΩ pull-up resistors. RST and CLK
provide unidirectional translation from host to card only.
Power Switch RON: 0.5Ω (Typical)
Supports Class B 3V SIM / UIM Cards
Supports Class C: 1.8V SIM / UIM Cards
Non-Preferential Host VCC Power-Up Sequencing
Either host can swap SIM slots with the assertion of a
single control pin: CH_Swap. The typical channel swap
time is 130ns.
Activation / Deactivation Timing Compliant
per ISO7816-03
The FXLA2203 does not contain internal Low Dropout
Regulator (LDOs). Instead, the FXLA2203 architecture
incorporates two low-RON internal power switches for
routing existing PMIC (Power Management Integrated
Circuit) LDOs to individual SIM slots. This reduces
overall system power, leverages existing LDO system
resources, and aligns with the philosophy that
centralizing LDOs in the PMIC facilitates power
management. Since the FXLA2203 does not block the
LDO function to the SIM card, existing activation /
deactivation timing transparency is maintained between
Hosts, PMICs, and SIM cards.
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Internal Pull up Resistors for Bi-Directional I/O Pin
Outputs Switch to 3-State if Host VCC at GND
Power-Off Protection
Packaged in 24-Terminal UMLP (2.5mm x 3.5mm)
Direction Control Not Needed
Applications
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Dual-Mode Dual-SIM Applications
The device allows voltage translation from as high as
3.6V to as low as 1.65V. Each port tracks its own port
power supply.
GSM, CDMA, WCDMA, TDSCDMA CDMA2000,
3G Cellular Phones
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Mobile TV: OMA BCAST
Ordering Information
Operating
Temperature Range
Packing
Part Number
Package
Method
24-Terminal, 2.5mm x 3.4mm Ultrathin Molded
Tape and Reel
FXLA2203UMX
-40 to 85°C
Leadless Package (UMLP), 0.4mm Pitch
© 2010 Fairchild Semiconductor Corporation
FXLA2203 • Rev. 1.0.5
www.fairchildsemi.com