MAX1840 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Low-Voltage SIM/Smart Card Level Translators in uMAX

19-1716; Rev 0; 4/00
Low-Voltage SIM/Smart Card
Level Translators in µMAX
General Description
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
±10kV ESD protection on all card contacts.
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 +1.4V 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.
Applications
SIM Interface in GSM Cellular Telephones
Smart Card Readers
Logic Level Translation
SPI™/QSPI™/MICROWIRE™ Level Translation
Features
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 ±10kV ESD Card Socket Protection
o Allows Level Translation with DV_CC ≥ V_CC or
DV_CC ≤ V_CC
o Automatically Shuts Down When Either Supply Is
Removed
o Card Contacts Actively Pulled Low During
Shutdown
o 1µA Total Quiescent Supply Current
o 0.01µA Total Shutdown Supply Current
o Ultra-Small 10-Pin µMAX Package
o Compliant with GSM Test Specifications 11.11
and 11.12
PART
MAX1840EUB
MAX1841EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
Typical Operating Circuit
DV_CC
DV_CC
DV_CC
V_CC
V_CC
SYSTEM
CONTROLLER
RIN
RST
MAX1840
MAX1841
CIN
CLK
DATA
OPTIONAL
SHDN*
IO
OPTIONAL
DDRV*
GND
GND
* SHDN FOR MAX1840 ONLY;
DDRV FOR MAX1841 ONLY.
V_CC
RST
SIM OR
SMART
CARD
CLK
IO
GND
Pin Configuration
TOP VIEW
DATA 1
DV_CC 2
CIN 3
RIN 4
SHDN (DDRV) 5
( ) ARE FOR MAX1841.
MAX1840
MAX1841
µMAX
10 IO
9 V_CC
8 CLK
7 RST
6 GND
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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