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PDF MAX1841 Data sheet ( Hoja de datos )
| Número de pieza | MAX1841 | |
| Descripción | Low-Voltage SIM/Smart Card Level Translators | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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 DVCC ≥ VCC or
DVCC ≤ VCC
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
DVCC
DVCC
DVCC
VCC
VCC
SYSTEM
CONTROLLER
RIN RST
MAX1840
MAX1841
CIN CLK
OPTIONAL
OPTIONAL
DATA
SHDN*
DDRV*
IO
GND
GND
* SHDN FOR MAX1840 ONLY;
DDRV FOR MAX1841 ONLY.
VCC
RST
SIM OR
SMART
CARD
CLK
IO
GND
Pin Configuration
TOP VIEW
DATA 1
DVCC 2
CIN 3
RIN 4
SHDN (DDRV) 5
( ) ARE FOR MAX1841.
MAX1840
MAX1841
µMAX
10 IO
9 VCC
8 CLK
7 RST
6 GND
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Low-Voltage SIM/Smart Card
Level Translators in µMAX
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.)
UNDERVOLTAGE
SHUTDOWN WAVEFORM
MAX1840/1-10
1.5V
VCC
0.5V/div
0
1V
CLK, RST, OR IO
0.5V/div
0
1ms/div
DDRV TO IO AND DATA WAVEFORM
(MAX1841 ONLY)
MAX1840/1-11
3V DDRV
2V/div
0
3V DATA
2V/div
0
5V
IO
2V/div
0
1µs/div
Pin Description
PIN
MAX1840 MAX1841
NAME
1 1 DATA
2 2 DVCC
3 3 CIN
4 4 RIN
— 5 DDRV
5 — SHDN
6 6 GND
7 7 RST
8 8 CLK
9 9 VCC
10 10 IO
FUNCTION
System Controller Data Input/Output. An open-drain IO with a 20kΩ pull-up
resistor to DVCC. For bidirectional data transfer, connect to an open-drain controller output
capable of sinking 1mA while pulling DATA low. If the controller is not open-drain, use
DDRV to send data and DATA to receive data.
Supply Voltage for System Controller Digital Pins. Set at +1.4V to +5.5V.
System Controller Clock Input
System Controller Reset Input
Optional System Controller Data Input. Connect to controllers without an open-drain out-
put. When not used, connect DDRV to DVCC.
Shutdown Mode Input. Driving SHDN low reduces the total supply current to less than
1µA. In shutdown mode, RST, CLK, and IO are actively pulled low and the transfer gate
between DATA and IO is disabled. When not used, connect SHDN to DVCC.
System Controller and Card Ground
Reset Output to Card. Actively pulled low during shutdown.
Clock Output to Card. Actively pulled low during shutdown.
Supply Voltage for Card-Side Digital Pins. Set at +1.7V to +5.5V. Proper supply bypassing
is required to meet ±10kV ESD specifications.
Card-Side Bidirectional Input/Output. An open-drain output with a 10kΩ pull-up resistor to
VCC. For bidirectional data transfer, connect to an open-drain card output capable of sink-
ing 1mA while pulling IO low. Actively pulled low during shutdown.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX1841.PDF ] | |
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