Software-Selectable Multiprotocol Transceiver Features: Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV/Detecon Inc. Certified NET1 and NET2 Compliant (Test Report No. NET2/071601/98) TBR2 Compliant (Test Report No. CTR2/071601/98) Software-Selectable Cable Termination Using the LTC1344A Complete DTE or DCE Port with LTC1543, LTC1344A Operates from Single 5V Supply with LTC1543

Switching Voltage Regulators 40V, 2A Synchronous Buck-Boost DC/DC Converter

Software-Selectable Multiprotocol Transceiver with Termination Features: Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV Telecom Services Inc. Certified NET1, NET2 and TBR2 Compliant On-Chip Cable Termination Pin Compatible with LTC1543 Complete DTE or DCE Port with LTC1544 Operates from Single 5V Supply Small Footprint

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

High Speed, Precision Delay RS485 Quad Line Receivers Features: Precision Propagation Delay: 18.5ns ±3.5ns Over 0°C to 70°C Temperature Range Data Rate: 52Mbps Low tPLH/tPHL Skew: 500ps Typ Low Channel-to-Channel Skew: 500ps Typ –7V to 12V RS485 Input Common Mode Range Input Resistance ≥22k, Even When Unpowered Guaranteed Fail-Safe Operation over the Entire Common Mode Range Hot Swap™ Capable High Common Mode Rejection to 26MHz Short-Circuit Protection: 10mA Typ Output Current for an Indefinite Short Three-State Output Capability Will Not Oscillate with Slow Moving Input Signals Single 5V Supply Pin Compatible with LTC488, LTC489

Micropower, Regulated 5V Charge Pump DC/DC Converter Features: Ultralow Power: Typical Operating ICC = 6µA Short-Circuit/Thermal Protected Regulated 5V ±4% Output Voltage 2.7V to 5V Input Range No Inductors Very Low ICC in Shutdown: <1µA Output Current: 10mA (VIN ≥ 2.7V) 20mA (VIN ≥ 3V) Shutdown Disconnects Load from VIN Internal Oscillator: 700kHz Compact Application Circuit (<0.1 in2) 8-Pin MSOP and SO Packages

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

Low Noise, Switched Capacitor-Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed −4.1V or Adjustable Output Shutdown Mode Drops Supply Current to < 1µA High Output Current: Up to 10mA, VCC = 5V Output Regulation: 5% Available in SO-8 and 16-Lead SSOP

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

SIM Power Supply and Level Translator Features: Step-Up/Step-Down Charge Pump Generates 5V Input Voltage Range: 2.7V to 10V Output Current: 10mA (VIN > 2.7V) 20mA (VIN > 3V) 3V to 5V Signal Level Translators >10kV ESD on All SIM Contact Pins Short-Circuit and Overtemperature Protected Very Low Operating Current: 60µA Very Low Shutdown Current: <1µA Soft Start Limits Inrush Current at Turn-On Programmable 3V or 5V Output Voltage 650kHz Switching Frequency Auxiliary 4.3V LDO/Power Switch (LTC1556 Only) Available in a 16- and 20-Pin Narrow SSOP

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor Features: 5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage Provides All Features Required by the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification Flags for Power Good, Over-Temperature and Overvoltage Fault 19A Output Current Capability from a 5V or 12V Supply Dual N-Channel MOSFET Synchronous Driver Initial Output Accuracy: ±1.5% Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations High Efficiency: Over 95% Possible Adjustable Current Limit Without External Sense Resistors Fast Transient Response Available in 20-Lead SSOP and SW Packages

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor Features: 5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage Provides All Features Required by the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification Flags for Power Good, Over-Temperature and Overvoltage Fault 19A Output Current Capability from a 5V Supply Dual N-Channel MOSFET Synchronous Driver Initial Output Accuracy: ±1.5% Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations High Efficiency: Over 95% Possible Adjustable Current Limit Without External Sense Resistors Fast Transient Response Available in 2O-Lead SSOP and SW Packages

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor Features: 5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage Provides All Features Required by the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification Flags for Power Good, Over-Temperature and Overvoltage Fault 19A Output Current Capability from a 5V Supply Dual N-Channel MOSFET Synchronous Driver Initial Output Accuracy: ±1.5% Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations High Efficiency: Over 95% Possible Adjustable Current Limit Without External Sense Resistors Fast Transient Response Available in 2O-Lead SSOP and SW Packages

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor Features: 5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage Provides All Features Required by the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification Flags for Power Good, Over-Temperature and Overvoltage Fault 19A Output Current Capability from a 5V or 12V Supply Dual N-Channel MOSFET Synchronous Driver Initial Output Accuracy: ±1.5% Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations High Efficiency: Over 95% Possible Adjustable Current Limit Without External Sense Resistors Fast Transient Response Available in 20-Lead SSOP and SW Packages

Backup Battery Controller with Fixed Output Features: Not Recommended For New Designs. Contact Analog Devices for Potential Replacement. Complete Battery Backup System in an SO-8, 16-Pin GN or SO Package Generates Fixed Backup Voltage (3.07V/4.63V) from a Single 1.2V NiCd Button Cell Automatic Main Supply to Backup Switching Minimum 100mW Output Power Automatic Fast Recharge of NiCd Battery Programmable NiCd Trickle Charge Current Smart NiCd Charger Minimizes Recharge Time and Maximizes System Efficiency After Backup Onboard Power-Up and Push-Button Reset Generator Performs VCC Supervisory Functions Reset Assertion Guaranteed at VCC = 1V Short-Circuit Protection Thermal Limiting

Very Low Noise, Low Distortion Active RC Quad Universal Filter Features: Continuous Time—No Clock Four 2nd Order Filter Sections, 10kHz to 150kHz Center Frequency ±0.5% Typical Center Frequency Accuracy ±0.3% Typical Center Frequency Accuracy (A Grade) Wide Variety of Response Shapes Lowpass, Bandpass and Highpass Responses 103dB Typical S/N, ±5V Supply (Q = 1) 97dB Typical S/N, Single 5V Supply (Q = 1) 96dB Typical S/(N + THD) at ±5V Supply, 20kHz Input Rail-to-Rail Input and Output Voltages DC Accurate to 3mV (Typ) “Zero-Power” Shutdown Mode Single or Dual Supply, 5V to 10V Total Resistor-Programmable fO, Q, Gain

Very Low Noise, Low Distortion Active RC Quad Universal Filter Features: Continuous Time—No Clock Four 2nd Order Filter Sections, 10kHz to 150kHz Center Frequency ±0.5% Typical Center Frequency Accuracy ±0.3% Typical Center Frequency Accuracy (A Grade) Wide Variety of Response Shapes Lowpass, Bandpass and Highpass Responses 103dB Typical S/N, ±5V Supply (Q = 1) 97dB Typical S/N, Single 5V Supply (Q = 1) 96dB Typical S/(N + THD) at ±5V Supply, 20kHz Input Rail-to-Rail Input and Output Voltages DC Accurate to 3mV (Typ) “Zero-Power” Shutdown Mode Single or Dual Supply, 5V to 10V Total Resistor-Programmable fO, Q, Gain

Active RC, 4th Order Lowpass Filter Family Features: Extremely Easy to Use—A Single Resistor Value Sets the Cutoff Frequency (256Hz < fC < 256kHz) Extremely Flexible—Different Resistor Values Allow Arbitrary Transfer Functions with or without Gain (256Hz < fC < 256kHz) Supports Cutoff Frequencies Up to 360kHz Using FilterCAD™ LTC1563-2: Unity-Gain Butterworth Response Uses a Single Resistor Value, Different Resistor Values Allow Other Responses with or without Gain LTC1563-3: Unity-Gain Bessel Response Uses a Single Resistor Value, Different Resistor Values Allow Other Responses with or without Gain Rail-to-Rail Input and Output Voltages Operates from a Single 3V (2.7V Min) to ±5V Supply Low Noise: 36µVRMS for fC = 25.6kHz, 60µVRMS for fC = 256kHz fC Accuracy < ±2% (Typ) DC Offset < 1mV Cascadable to Form 8th Order Lowpass Filters Available in Narrow SSOP-16 Package

Active RC, 4th Order Lowpass Filter Family Features: Extremely Easy to Use—A Single Resistor Value Sets the Cutoff Frequency (256Hz < fC < 256kHz) Extremely Flexible—Different Resistor Values Allow Arbitrary Transfer Functions with or without Gain (256Hz < fC < 256kHz) Supports Cutoff Frequencies Up to 360kHz Using FilterCAD™ LTC1563-2: Unity-Gain Butterworth Response Uses a Single Resistor Value, Different Resistor Values Allow Other Responses with or without Gain LTC1563-3: Unity-Gain Bessel Response Uses a Single Resistor Value, Different Resistor Values Allow Other Responses with or without Gain Rail-to-Rail Input and Output Voltages Operates from a Single 3V (2.7V Min) to ±5V Supply Low Noise: 36µVRMS for fC = 25.6kHz, 60µVRMS for fC = 256kHz fC Accuracy < ±2% (Typ) DC Offset < 1mV Cascadable to Form 8th Order Lowpass Filters Available in Narrow SSOP-16 Package