MAX1741 查看數據表（PDF） - Maxim Integrated

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MAX1741

SIM/Smart Card Level Translators in µMAX

Maxim Integrated 

SIM/Smart Card Level Translators

in µMAX

PIN

MAX1740 MAX1741

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

Pin Description

FUNCTION

System Controller Data Input/Output. An open-drain input/output 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 +1.425V 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

2µA. 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 +2.25V to +5.5V. Proper supply bypass-

ing 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.

Detailed Description

The MAX1740/MAX1741 provide the necessary level

translation for interfacing with subscriber identity mod-

ules (SIMs) and smart cards in multivoltage systems.

These devices operate with logic supply voltages

between +1.425V and +5.5V on the controller side

(DVCC) and between +2.25V and +5.5V on the card side

(VCC). The total supply current (IDVCC + IVCC) is 2.5µA

(max) while operating in an idle state (see Electrical

Characteristics). Figure 2 shows a typical application cir-

cuit and functional diagram.

Level Translation

The MAX1740/MAX1741 provide level translators for a

clock input, a reset input, and a bidirectional data

input/output. The clock and reset inputs (CIN and RIN)

are level shifted from the controller-side supply rails

(DVCC to GND) to the card-side supply rails (VCC to

GND). When connected to an open-drain controller out-

put, DATA and IO provide bidirectional level translation.

+1.8V

30pF

MAX1740

MAX1741

DVCC

VCC

SHDN*

RST

RIN

CLK

CIN

DDRV*

IO

DATA

GND

+3.0V OR

+5.0V

30pF 30pF 30pF

* SHDN FOR MAX1740 ONLY

DDRV FOR MAX1741 ONLY

NOTE: ALL CAPACITANCES INCLUDE CAPACITIVE LOADS OF

TEST PROBES AND BOARD LAYOUT.

Figure 1. MAX1740/MAX1741 Test Circuit

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