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MAX1740EUB Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1740EUB Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page All level translation is valid for DVCC ≥ VCC or DVCC ≤ VCC. The MAX1740/MAX1741 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 Driver section for bidirectional data translation. Data Driver (MAX1741 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 DVCC to reduce total supply cur- rent. Shutdown Mode For the MAX1740, drive SHDN low to activate shut- down. Connect SHDN to DVCC or 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 10k Ω pull-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/Removal The 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 4), the easi- est way to achieve this is by shutting down the MAX1686H or by driving SHDN (MAX1740 only) low. If specific sequencing is desired, pull IO low by driving either DATA or DDRV (MAX1741 only) low, and pull CLK and RST low by driving CIN and RIN low, respec- tively. ESD Protection As with all Maxim devices, ESD-protection structures on all pins protect against electrostatic discharges (ESDs) encountered during handling 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 protection against ±10kV of ESD, according to the Human Body Model. The ESD structures withstand high ESD in all states: normal operation, shutdown, and power-down. After an ESD event, the MAX1740/MAX1741 continue working without latchup. ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report documenting test setup, test methodology, and test results. Human Body Model Figure 3a shows the Human Body Model, and Figure 3b shows the current waveform it generates when dis- charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of inter- SIM/Smart Card Level Translators in µMAX 8 _______________________________________________________________________________________ Figure 2. Typical Application Circuit and Functional Diagram VCC SIM OR SMART CARD SYSTEM CONTROLLER CLK RST 1 µF GND GND CLK RST GND VCC DVCC DVCC MAX1740 MAX1741 SHDN* OPTIONAL RIN CIN 20k 10k OPTIONAL DATA DDRV* SHDN FOR MAX1740 ONLY DDRV FOR MAX1741 ONLY * SHUTDOWN CONTROL IO IO 1 µF DVCC VCC |
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