LTC4557 Linear Technology, LTC4557 Datasheet
LTC4557
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LTC4557 Summary of contents
Page 1
... GND CCB CC C3 CLKB CLK 1.8V/3V C2 SMART RSTB RST CARD C7 I/OB I/O GND C5 4557 TA01 LTC4557 Dual SIM/Smart Card U 4557 provides power conversion and signal level Deactivation Sequence RSTX 5V/DIV CLKX 5V/DIV I/OX 5V/DIV V CCX 2V/DIV s/DIV VCCX 4557 G07 4557f 1 ...
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... Sink Current = –200 A (Note 2) Source Current = 200 A (Note 2) Loaded with 33pF (10% to 90%) (Note 2) (Note 2) Sink Current = –200 A (Note 2) Source Current = 200 A (Note 2) Loaded with 33pF (10% to 90%) (Note ORDER PART NUMBER LTC4557EUD CLKIN RSTIN 9 UD PART MARKING LAHP = 42 C/W ...
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... I/OA,B CCA,B Loaded with 33pF (10% to 90%) Note 3: The LTC4557E is guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: Based on long term current density limitations. ...
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... LTC4557 W U TYPICAL PERFOR A CE CHARACTERISTICS No Load Supply Current vs V BATT CCA CCB 75 DROPOUT CCX 1.8V CCX 60 55 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 SUPPLY VOLTAGE (V) 4557 G01 V Shutdown Current BATT vs Supply Voltage 3 1.8V DVCC 2.5 2.0 T 1.5 1.0 0.5 0 2.7 3.1 3.5 3.9 SUPPLY VOLTAGE (V) Data – I/O Channel, C I/0X 1V/DIV DATA ...
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... CTIO S DV (Pin 2): Power. Reference voltage for the control CC logic. V (Pin 3): Power. Supply voltage for the analog BATT sections of the LTC4557 (Pins 4, 1): Card Socket. The V CCA CCB should be connected to the V pins of the respective card CC sockets. The activation of the V ...
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... LTC4557 W BLOCK DIAGRA V 4 CCA I/OA 7 RSTA 6 CLKA 5 DATA 8 RSTIN 9 CLKIN BATT 2 3 LDOA LDOB CONTROL LOGIC 17 13 GND ENABLE 1 V CCB 14 I/OB 15 RSTB 16 CLKB 4557 4557f ...
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... U OPERATIO The LTC4557 features two independent smart card chan- nels. Only one of these channels may operate at a time. Each channel is able to output two voltage levels: 1.8V and 3V. The channel selection and voltage selection are controlled by the ENABLE, M0 and M1 pins as shown in Table 1. Table 1. Channel and Voltage Truth Table ...
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... LTC4557 U OPERATIO Activation/Deactivation Activation and deactivation sequencing is handled by built-in circuitry. The activation sequence is initiated by bringing the ENABLE pin HIGH. The activation sequence is outlined below: 1. The RST, CLK and I/O pins are held LOW enabled After V is stable at its selected level, The I/O and RST CC channels are enabled ...
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... CCA,B located very close to the V pins and tied immediately CCA,B to the ground plane. Capacitor Selection A total of four capacitors are required for proper bypassing of the LTC4557. An input bypass capacitor is required at V and DV . Output bypass capacitors are required on BATT CC each of the smart card V pins ...
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... U U APPLICATIO S I FOR ATIO Shutdown Modes The LTC4557 can enter a low current shutdown mode by one of two methods. First, the ENABLE pin can be brought LOW by the controller to directly shut down the part. The other way is to lower DV below 1.2V, at which point the ...
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... U UD Package 16-Lead Plastic QFN (3mm 3mm) (Reference LTC DWG # 05-08-1691) 0.70 0.05 PACKAGE OUTLINE 0.25 0.05 0.50 BSC 0.75 0.05 3.00 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) 1.45 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LTC4557 BOTTOM VIEW—EXPOSED PAD 0.23 TYP R = 0.115 (4 SIDES) TYP 15 16 0.40 0. (UD) QFN 0603 0.25 0.05 0.50 BSC 11 4557f ...
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... BATT 1. 0 BATT 10 5 CLKIN CLKA 9 6 RSTIN RSTA 8 7 DATA I/ CCA C1 LTC4557 GND CCB 13 16 ENABLE CLKB RSTB I/OB COMMENTS V : 2.7V to 10V 2.7V to 10V 2.7V to 10V < ...