The Intersil ISL4311X are high precision, high performance analog devices fully specified for 3.3V, 5V and 12V switching operation with improved leakage, Icc and switching function time specifications. Designed to operate from a single +2.4V to +12V supply Low supply current (temperature and voltage range) and low leakage current (1nA) make these switches ideal for battery powered applications. The low RON and fast switching speed supply range over a wide operating range expands the usefulness of these devices in industrial equipment, portable instruments and as input signal new generation low voltage data multiplexer converters. There are some minimal packages that reduce board space constraints, making Intersil the ideal solution for newest low voltage line switches. The ISL4311X is a SPST switch, the ISL43110 is normally open (NO), and the ISL43111 is normally closed (NC). Table 1 summarizes the performance of this series. For similar performance ±5V power supply versions, please refer to the ISL43112/13 product introduction

feature

Fully specified from 3.3V, 5V and 12V supplies

SOT-23 Packaging

Single power supply operation. +2.4V to +12V

On-resistance (RON Max). 20 ohms (V+=5V) 10 ohms (V+=12V)

Ron Flatness. 1.5 Euro

Charge injection (max). 10

Low power consumption (max PD). <5 microwatts

Low leakage current (maximum at 85°C). 10nA (close leak) 20nA (leak)

Fast switching action - t (max). 80 ns - tOFF (max). 50 ns

2000V ESD protection minimum per method 3015.7

TTL, CMOS compatible

application

Battery Powered, Handheld and Portable Devices - Cell Phones/Mobile Phones, Pagers - Notebooks, Notebooks, PDAs, PDAs

Communication Systems - Radios - Switches, Switches

Test Equipment - Logic and Spectrum Analyzers - Portable Meters, DVM, DMM

Medical Equipment - Ultrasound, MRI, CAT Scan - Electrocardiograph, Blood Analyzer

HUD

Audio and video switching

General Circuits - +3V/+5V D/A Converters and A/D Converters - Sample and Hold Circuits - Digital Filters - Operational Amplifier Gain Switching Networks - High Frequency Analog Switches - High Speed Multiplexing - Integrator Reset Circuits

Related Literature

Technical Brief TB363" Handling and Processing Moisture Sensitive Surface Mount Devices (SMD)

Absolute Maximum Ratings Thermal Information

V+ is grounded. -0.3 to 15 volts

Input voltage

in (Note 2). -0.3 to ((V+)+0.3V)

No, NC (Note 2). -0.3 to ((V+)+0.3V)

The output voltage

COM (Note 2). -0.3 to ((V+)+0.3V)

Continuous current (any terminal). 20 mA

Peak current NO, NC or COM

(pulse 1 ms, 10% duty cycle, max). 30 mA

ESD rating (per MIL-STD-883 method 3015). >2kV

operating conditions

temperature range

ISL4311XIX. -40oC to 85oC

Thermal Resistance (Typical, Note 3) θJA (oC/W)

5LD SOT-23 package. 225

8 Ld SOIC package. 170

Maximum Junction Temperature (Plastic Packaging). 150 degrees Celsius

Moisture Sensitivity (see Technical Brief TB363)

All packaging. Level 1

Maximum storage temperature range. -65 degrees Celsius to 150 degrees Celsius

Maximum lead temperature (10s for soldering). 300 degrees Celsius (lead head only)

CAUTION: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a pressure rating and operation of the device under the above or any other conditions stated in the operating section of this specification is not implied.

notes:

2. NO, NC, COM or signals above V+ or GND are clamped by internal diodes. Limit forward diode current to maximum rated current.

3. θJA is measured with components mounted on a low-efficiency thermal conductivity test board in free air. See Technical Bulletin TB379 for details.

Electrical Specifications: 5V Power Supply Test Conditions: V+=+4.5V to +5.5V, GND=0V, VINH=2.4V, VINL=0.8V (Note 4) unless otherwise specified

Electrical Specifications: 5V Power Supply Test Conditions: V+=+4.5V to +5.5V, GND=0V, VINH=2.4V, VINL=0.8V (Note 4) unless otherwise specified (continued)

notes:

4. VIN = Input voltage to perform correct function.

5. The algebraic convention is used in this data sheet, where the most negative value is the minimum value and the most positive value is the maximum value.

6. Leakage parameters are 100% tested at high temperature and pass relevant guarantees at 25°C.

Detailed description

The ISL43110 and ISL43111 analog switches provide precise switching capability from a single 2.4V to 12V supply with low on-resistance and high-speed operation. The device is especially suitable for portable battery powered devices due to low operating supply voltage (2.4V), low power consumption (5 microwatts), low leakage current (1nA max) and small SOT-23 package. High frequency applications also benefit from broadband, as well as a high degree of isolation. Power Supply Sequencing and Overvoltage Protection As with any CMOS device, proper power supply sequencing is required to protect the device from excessive input currents that could permanently damage the integrated circuit. All I/O pins include ESD protection diodes from pins to V+ and to GND (see Figure 6). To prevent these diodes, V+ must be applied before any input signal, and the input signal voltage must be kept between V+ and GND. If these conditions cannot be guaranteed, the following two protection methods should be used. Logic inputs can easily be protected by adding 1kΩ resistors in series with the inputs (see Figure 6). The resistors limit the input current below the threshold resulting in permanent damage and sub-microamp input currents that produce an insignificant voltage drop under normal operation. Adding a series resistor to the switch input defeats the purpose of using a low Ron switch, so two small signal diodes can be placed in series with the power pins to provide overvoltage protection on all pins (see Figure 6). These additional diodes limit the analog signal from 1V below V+ to 1V above ground. Low leakage current performance is not affected by this method, but switch resistance may increase, especially at low supply voltages.

Power Considerations

The ISL4311X structure is typical of most CMOS analog switches except that there are only two power pins: V+ and ground. Unlike switches with a maximum supply voltage of 13V, the ISL4311x15V maximum supply voltage provides ample 10% tolerance of a 12V supply, with room for overshoot and noise spikes. The recommended minimum supply voltage is 2.4V. It is important to pay attention to the range of the input signal, the switching time, and the reduced on-resistance at lower supply voltages. Refer to the electrical specification sheet and typical performance details curves. V+ and GND power the internal CMOS switches and set their analog voltage limits. These supplies are also internal logic and level translators. The level shifter will input logic levels to switch the V+ and GND signals to drive the analog switch gate terminals. This series of switches cannot be used with bipolar switches to operate the power supply because the input switch point becomes negative for this configuration. For a ±5V SPST switch, see the ISL43112/13 datasheet. Logic Level Thresholds This switch family is TTL compatible (0.8V and 2.4V) with a supply voltage range of 3V to 11V over the full temperature range (see Figure 10). At 12V, the low temperature VIH level is about 2.5V. Still below the TTL guaranteed high voltage output minimum level of 2.8V, but with reduced noise margin. For best results with a 12V supply, use a logic family to provide a VOH greater than 3V. The digital input stage is where the digital input voltage is not on one of the supply rails. Driving fast transition digital input signal times from GND to V+ minimizes power consumption.

High frequency performance

In a 50Ω system, the signal response is fairly flat at 20MHz, with a-3dB bandwidth exceeding 200MHz (see Figure 15). Figure 15 also illustrates that the response is very consistent over a wide V+ range, with varying analog signal levels. The turn-off switch acts like a capacitor, creating a feedthrough of the signal from the input to the output of the switch by passing higher frequencies with less attenuation. Non-isolated is the resistance of this feedthrough. Figure 16 details the high level of isolation provided by this home. At 10MHz, shut down in a 50Ω system, the isolation is about 50dB, decreasing with frequency by about 20dB per decade. Higher load impedance reduces isolation due to the off and load impedance of the voltage divider action. Leakage Considerations Reverse ESD protection diodes are internally connected between each analog signal pin and V+ and GND. A if any analog signal exceeds V+ or ground. Almost all analog leakage current comes from the ESD diode to V+ or ground. Although the pins on a given signal are the same and thus fairly balanced, they have different reverse biases. Everyone is biased against V+ or GND and analog signals. This means that their leakage varies with the signal. The difference between the two diodes The leakage at the V+ and GND pins constitutes the analog signal path leakage current. All analog leakage currents are between each pin and one power terminal, not the other switch terminals. This is why a given switch can show the same or opposite leakage current polarity. There is no connection path between the analog signal and V+ or GND.