MAX1840EUB ,Low-Voltage SIM/Smart Card Level Translators in MAXApplicationsOrdering InformationSIM Interface in GSM Cellular TelephonesPART TEMP. RANGE PIN-PACKAG ..
MAX1840EUB ,Low-Voltage SIM/Smart Card Level Translators in MAXApplicationsOrdering InformationSIM Interface in GSM Cellular TelephonesPART TEMP. RANGE PIN-PACKAG ..
MAX1840EUB ,Low-Voltage SIM/Smart Card Level Translators in MAXELECTRICAL CHARACTERISTICS(Figure 1, DV = +1.8V; V = +1.8V, +3.0V, or +5.0V; SHDN = DV , CIN = RIN ..
MAX1840EUB+ ,Low-Voltage SIM/Smart-Card Level Translators in µMAXFeaturesThe MAX1840/MAX1841 subscriber identity module♦ SIM/Smart Card Level Shifting(SIM)/smart ca ..
MAX1840EUB+T ,Low-Voltage SIM/Smart-Card Level Translators in µMAXELECTRICAL CHARACTERISTICS(Figure 1, DV = +1.8V; V = +1.8V, +3.0V, or +5.0V; SHDN = DV , CIN = RIN ..
MAX1841EUB ,Low-Voltage SIM/Smart Card Level Translators in MAXFeaturesThe MAX1840/MAX1841 subscriber identity module SIM/Smart Card Level Shifting(SIM)/smart ca ..
MAX472ESA ,Precision, High-Side Current-Sense AmplifiersFeaturesThe MAX471/MAX472 are complete, bidirectional, high-' Complete High-Side Current Sensingsid ..
MAX472ESA-T ,Precision, High-Side Current-Sense AmplifiersApplicationsMAX471CSA 0°C to +70°C 8 SOPortable PCs:MAX471EPA -40°C to +85°C 8 Plastic DIPNotebooks ..
MAX4731EUA+ ,50 Ohm, Dual SPST Analog Switches in UCSPApplications RANGE PACKAGE MARKMAX4731EUA -40°C to +85°C 8 µMAX —Battery-Powered SystemsMAX4731ETA ..
MAX4731EUA+T ,50 Ohm, Dual SPST Analog Switches in UCSPapplications.♦ Guaranteed < 0.1nA Leakage Current at When powered from a +3V supply, these switches ..
MAX4733EUA+ ,50 Ohm, Dual SPST Analog Switches in UCSPELECTRICAL CHARACTERISTICS—Single +3V Supply(V+ = +3V ±10%, V = +2.0V, V = +0.8V, T = T to T , unle ..
MAX4734EUB ,0.8 / Low-Voltage / 4-Channel Analog MultiplexerApplicationsOrdering InformationPower RoutingPART TEMP RANGE PIN-PACKAGEBattery-Powered SystemsMAX4 ..
MAX1840EUB-MAX1841EUB
Low-Voltage SIM/Smart Card Level Translators in MAX
General DescriptionThe MAX1840/MAX1841 subscriber identity module
(SIM)/smart card level translators provide level shifting
and electrostatic discharge (ESD) protection for SIM and
smart card ports. These devices integrate two unidirec-
tional level shifters for the reset and clock signals, a bidi-
rectional level shifter for the serial data stream, and
±10kV ESD protection on all card contacts.
The MAX1840 includes a SHDNcontrol input to aid
insertion and removal of SIM and smart cards, while the
MAX1841 includes a system-side data driver to support
system controllers without open-drain outputs. The logic
supply voltage range is +1.4V to +5.5V for the “controller
side” and +1.7V to +5.5V for the “card side.” Total sup-
ply current is 1.0µA. Both devices automatically shut
down when either power supply is removed. For a com-
plete SIM card interface, combine the MAX1840/
MAX1841 with the MAX1686H 0V/3V/5V regulated
charge pump.
The MAX1840/MAX1841 are available in ultra-small
10-pin µMAX packages that are only 1.09mm high and
half the area of an 8-pin SO.
The MAX1840/MAX1841 are compliant with GSM test
specifications 11.11 and 11.12.
ApplicationsSIM Interface in GSM Cellular Telephones
Smart Card Readers
Logic Level Translation
SPI™/QSPI™/MICROWIRE™ Level Translation
FeaturesSIM/Smart Card Level Shifting+1.4V to +5.5V Controller Voltage Range+1.7V to +5.5V Card Voltage Range±10kV ESD Card Socket ProtectionAllows Level Translation with DVCC≥
VCC or
DVCC ≤VCCAutomatically Shuts Down When Either Supply Is
RemovedCard Contacts Actively Pulled Low During
Shutdown1µA Total Quiescent Supply Current0.01µA Total Shutdown Supply CurrentUltra-Small 10-Pin µMAX PackageCompliant with GSM Test Specifications 11.11
and11.12
MAX1840/MAX1841
Low-Voltage SIM/Smart Card
Level Translators in µMAX
Typical Operating Circuit19-1716; Rev 0; 4/00
Pin Configuration
Ordering InformationSPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
MAX1840/MAX1841
Low-Voltage SIM/Smart Card
Level Translators in µMAX
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Figure 1, DVCC= +1.8V; VCC= +1.8V, +3.0V, or +5.0V; SHDN= DVCC, CIN = RIN = GND or DVCC, IO = VCC, DATA = DDRV = DVCC,
CIO= CCLK= CRST= CDATA= 30pF, TA
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DVCC, VCCto GND................................................-0.3V to +6.0V
RIN, CIN, DATA, DDRV,
SHDNto GND......................................-0.3V to (DVCC + 0.3V)
RST, CLK, IO to GND.................................-0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C)...........444mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1840/MAX1841
Low-Voltage SIM/Smart Card
Level Translators in µMAX
ELECTRICAL CHARACTERISTICS (continued)(Figure 1, DVCC= +1.8V; VCC= +1.8V, +3.0V, or +5.0V; SHDN= DVCC, CIN = RIN = GND or DVCC, IO = VCC, DATA = DDRV = DVCC,
CIO= CCLK= CRST= CDATA= 30pF, TA
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note1)
Note 1:Specifications to -40°C are guaranteed by design, not production tested.
Note 2:VILis defined as the voltage at which the output (DATA/IO) voltage equals 0.5V.
Note 3:VIHis defined as the voltage at which the output (DATA/IO) voltage exceeds the input (IO/DATA) voltage by 100mV.
Note 4:Timing specifications are guaranteed by design, not production tested.
Note 5:The maximum CLK frequency is defined as the output duty cycle remaining in the 40% to 60% range when the 50% CIN is
applied. CIN has 5ns rise and fall times; levels are GND to DVCC. Input and output levels are measured at 50% of the waveform.
Low-Voltage SIM/Smart Card
Level Translators in µMAX
Typical Operating Characteristics(Circuit of Figure 1, DVCC= 3.0V, VCC= +5.0V, DDRV or DATA = DVCC, RIN = CIN = GND, TA= +25°C, unless otherwise noted.)
MAX1840/MAX1841
Low-Voltage SIM/Smart Card
Level Translators in µMAX
UNDERVOLTAGE
SHUTDOWN WAVEFORMMAX1840/1-10
1ms/div
VCC
0.5V/div
1.5V
CLK, RST, OR IO
0.5V/div
DDRV TO IO AND DATA WAVEFORM
(MAX1841 ONLY)MAX1840/1-11
1µs/div
DDRV
2V/div
2V/div
DATA
2V/div
Typical Operating Characteristics (continued)(Circuit of Figure 1, DVCC= 3.0V, VCC= +5.0V, DDRV or DATA = DVCC, RIN = CIN = GND, TA= +25°C, unless otherwise noted.)
Pin Description
MAX1840/MAX1841
Low-Voltage SIM/Smart Card
Level Translators in µMAX
Detailed DescriptionThe MAX1840/MAX1841 provide the necessary level
translation for interfacing with SIMs and smart cards in
multivoltage systems. These devices operate with logic
supply voltages between +1.4V and +5.5V on the con-
troller side (DVCC) and between +1.7V and +5.5V on the
card side (VCC). The total supply current (IDVCC+ IVCC)
is 1µA while operating in an idle state (see Electrical
Characteristics). Figure 1 shows the MAX1840/MAX1841
test circuit. The Typical Application Circuitappears at the
end of this data sheet.
Level TranslationThe MAX1840/MAX1841 provide level translators for a
clock input, a reset input, and a bidirectional data IO.
The clock and reset inputs (CIN and RIN) are level shift-
ed from the controller-side supply rails (DVCCto GND)
to the card-side supply rails (VCCto GND). When con-
nected to an open-drain controller output, DATA and IO
provide bidirectional level translation. All level transla-
tion is valid for DVCC≥VCCor DVCC≤VCC. The
MAX1840/MAX1841 contain internal pull up resistors
from DATA to the controller-side supply (DVCC)and
from IO to the card-side supply (VCC). For push-pull
controller outputs, see the Data Driversection for bidi-
rectional data translation.
Data Driver (MAX1841 Only)When using a microcontroller (µC) without an open-drain
output, use the data driver (DDRV) input to send data to
the SIM/smart card, while DATA provides the controller-
side output for bidirectional data transfer. When not
used, connect DDRV to DVCCto reduce total supply cur-
rent.
Shutdown ModeFor the MAX1840, drive SHDNlow to activate shut-
down. Connect SHDNto DVCCor drive high for normal
operation. To allow for card insertion and removal, shut-
down mode actively pulls CLK, RST, and IO low; it also
disconnects the internal 10kΩpull up resistor from VCC
to prevent excessive current draw. Shutdown mode
reduces the total supply current (IDVCC+ IVCC) to
0.01µA.
SIM/Smart Card Insertion/RemovalThe SIM/smart card specifications require that the card-
side pins (VCC, CLK, RST, IO) be at ground potential
prior to inserting the SIM/smart card. For applications
using the MAX1686H (Figure 3), the easiest way to
achieve this is by shutting down the MAX1686H or by
driving SHDN(MAX1840 only) low. If specific sequenc-
ing is desired, pull IO low by driving either DATA or
DDRV (MAX1841 only) low, and pull CLK and RST low
by driving CIN and RIN low, respectively.
ESD ProtectionAs with all Maxim devices, ESD-protection structures on
all pins protect against ESDs encountered during han-
dling and assembly. For further protection during card
insertion and removal, the pins that connect to the card
socket (CLK, RST, IO, VCC, and GND) provide protec-
tion against ±10kV of ESD. The ESD structures with-
stand high ESD in all states: normal operation,
shutdown, and power-down. After an ESD event, the
MAX1840/MAX1841 continue working without latchup.
A 1µF bypass capacitor from VCCto GND is required to
exceed ±10kV ESD specifications.
ESD Test ConditionsESD performance depends on a variety of conditions.
Contact Maxim for a reliability report documenting test
setup, test methodology, and test results.
Applications Information
SIM/Smart Card InterfaceTo provide 5V when interfacing with a 5V SIM/smart card,
+3V systems require a DC-DC converter. The MAX1686H
+5V regulating charge pump for SIM cards provides
