19-1716; Rev 0; 4/00
Low-Voltage SIM/Smart Card
Level Translators in µMAX
General Description
Features
The 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
10kꢀ ESD protection on all card contacts.
o SIM/Smart Card Level Shifting
o +1.4V to +5.5V Controller Voltage Range
o +1.7V to +5.5V Card Voltage Range
o
1ꢀ0V ꢁSꢂ Card Soꢃ0et ꢄroteꢃtion
o Allows Level Translation with ꢂV
≥ V
or
CC
CC
The MAX1840 includes a SHDN control 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 +1.4ꢀ to +5.5ꢀ for the “controller
side” and +1.7ꢀ to +5.5ꢀ 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 0ꢀ/3ꢀ/5ꢀ regulated
charge pump.
ꢂV
≤ V
CC
CC
o Automatiꢃally Shuts ꢂown When ꢁither Supply Is
Removed
o Card Contaꢃts Aꢃtively ꢄulled Low ꢂuring
Shutdown
o 1µA Total Quiesꢃent Supply Current
o ꢀ.ꢀ1µA Total Shutdown Supply Current
o Ultra-Small 1ꢀ-ꢄin µMAX ꢄaꢃ0age
o Compliant with GSM Test Speꢃifiꢃations 11.11
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.
and 11.12
The MAX1840/MAX1841 are compliant with GSM test
specifications 11.11 and 11.12.
Applications
Ordering Information
SIM Interface in GSM Cellular Telephones
ꢄART
TꢁMꢄ. RANGꢁ
-40°C to +85°C
-40°C to +85°C
ꢄIN-ꢄACKAGꢁ
MAX184ꢀEUB
MAX1841EUB
10 µMAX
Smart Card Readers
10 µMAX
Logic Level Translation
SPI™/QSPI™/MICROWIRE™ Level Translation
Typical Operating Circuit
Pin Configuration
DV
V
CC
CC
TOP VIEW
V
V
CC
CC
DV
DV
CC
CC
DATA
DV
1
2
3
4
5
10 IO
RIN
RST
RST
SIM OR
9
8
7
6
V
CC
CC
CIN
RIN
CLK
RST
GND
MAX1840
MAX1841
SYSTEM
CONTROLLER
MAX1840
MAX1841
SMART
CARD
CLK
CLK
CIN
SHDN (DDRV)
DATA
SHDN*
DDRV*
µMAX
OPTIONAL
OPTIONAL
( ) ARE FOR MAX1841.
IO
IO
GND
GND
GND
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
*
SHDN FOR MAX1840 ONLY;
DDRV FOR MAX1841 ONLY.
________________________________________________________________ Maxim Integrated Products
1
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