ICL 3222 PDF

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These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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Note that all the receiver outputs remain enabled during shutdown see Table 2. Connect unused inputs to GND for the best performance. INVALID operates in all modes forced or automatic powerdown, or forced onso it is also useful for systems employing manual powerdown circuitry. This occurs when an attached peripheral device is shut off or the RS cable is removed, conserving system power automatically without ixl to the hardware or operating system.

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ICLX monitor receivers remain active even during manual powerdown and forced receiver disable, making them extremely useful for Ring Indicator monitoring. Internally generated negative transmitter supply Standard receivers driving powered down peripherals must be disabled to prevent current?

Figure 5 illustrates a circuit that keeps the ICL32XX from initiating automatic powerdown for ms after powering up. All Transmitter Outputs Loaded with 3k? Additionally, the two ICLX products include noninverting monitor receivers denoted by the ROUTB label that are always active, regardless of the state ic, any control lines. Figure 10 details a transmitter loopback test circuit, and Figure 11 illustrates the loopback test result at kbps.

A mouse, or other application, may need more time to wake up from shutdown.

Kcl 9 shows the transmitter output voltages under increasing load current. Low Supply Current in Powerdown State. Nevertheless, if strictly manual control over powerdown is desired, the user must strap FORCEON high to disable the automatic powerdown circuitry.

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The charge pumps operate discontinuously i. Connect the bypass capacitor as close as possible to the IC. The already low current requirement drops signi?

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When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value.

Active low output that indicates if no valid RS levels are present on any receiver input. In the case of a disconnected interface cable where all the receiver inputs are? The power management logic then uses this indicator to power down the interface block. This gives the slow-to-wake peripheral circuit time to reestablish valid RS output levels. F bypass capacitor is adequate. Figure 12 shows the loopback results for a single transmitter driving pF and an RS load at kbps.

These devices power up again when a valid RS voltage is applied to any receiver input. Reconnecting the cable restores valid levels at the receiver inputs, INVALID switches high, and the power management logic wakes up the interface block.

Active low input to shut down transmitters and on-board power supply, to place device in low power mode. The circuit is divided into three sections: This automatic powerdown feature provides additional system power savings without changes to the existing operating system. The static transmitters were also loaded with an RS receiver. This family is fully compatible with 3.

ICL receivers disable during forced manual powerdown, but not during automatic powerdown see Table 2. Data rates greater than kbps are guaranteed at worst case load conditions.

Driving EN high disables all the inverting standard receiver outputs placing them in a high impedance state. Each transmitter is loaded with 3k? The specification table lists a minimum of kbps to maintain complete compatibility with competitor data sheets. F; Unless Otherwise Speci? For the lowest power consumption during powerdown, the receivers should also be disabled by driving the EN input high see next section, and Figures 2 and 3. Except for the ICL, all transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode see Table 2.

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Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. When no valid RS voltages see Figure 6 are sensed on any receiver input for 30? Capacitor Selection The charge pumps require 0. For other supply voltages refer to Table 3 for capacitor values.

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Note that the transmitters enable only when the magnitude of the supplies exceed approximately 3V. As they activate, the two transmitter outputs properly go to opposite RS levels, with no glitching, ringing, nor undesirable transients. This is a stress only rating and operation of the device 32222 these or any other conditions above those indicated in the operational sections of this speci? Guaranteed Minimum Slew Rate.

All devices guarantee a kbps data rate for full load conditions 3k? The charge pump, the transmitters, and the receivers. The INVALID output always indicates whether or not a valid RS signal is present at any of the receiver inputs see Table 2giving the user an easy way to determine when the interface kcl should power down. The ICLX are 3 driver, 5 receiver devices that provide a complete serial port suitable for laptop or notebook computers.

This micro-power mode makes these devices ideal for battery powered and portable applications.