ICL 3222 PDF

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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 of any control lines.

This gives the slow-to-wake peripheral circuit time to reestablish valid RS output ico. Wide Power Supply Range. For other supply voltages refer to Table 3 for capacitor values. Active low input to shut down transmitters and on-board power supply, to place device in low power mode.

Internally generated negative transmitter supply For this test, all transmitters were simultaneously driving RS loads in parallel with pF, at kbps.

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When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature. Do not use values smaller than those listed in Table 3. This automatic powerdown feature provides additional system power savings without changes to the existing operating system. The specification table lists a minimum of kbps to maintain complete compatibility with competitor data sheets.

RS compatible receiver inputs. In the case of a disconnected interface cable where all the receiver inputs are? This family is fully compatible with 3. INVALID operates in all modes forced or automatic powerdown, or forced onso it is also useful for systems employing manual powerdown circuitry.


The charge pumps operate discontinuously i. When no valid RS voltages see Figure 6 are sensed on any receiver input for 30? A mouse, or other application, may need more time to wake up from shutdown. This renders them useless for wake up functions, but the corresponding monitor receiver can be dedicated to this task as shown in Figure 3.

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This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this speci? This occurs when an attached peripheral device is shut off or the RS cable is removed, conserving system power automatically without changes to the hardware or operating system.

In applications that are particularly sensitive to power supply noise, decouple VCC to ground with a capacitor of the same value as the charge-pump capacitor C1. ICLX monitor receivers remain active even during manual powerdown and forced receiver disable, making them extremely useful for Ring Indicator monitoring.

Note that all the receiver outputs remain enabled during shutdown see Table 2. VCC With any of the above control schemes, the time required to exit powerdown, and resume transmission is only ?

The charge pump, the transmitters, and the receivers. Reconnecting the cable restores valid levels at the receiver inputs, INVALID switches high, and the power management logic wakes up the interface block. Capacitor Selection The charge pumps require 0. Figure 10 details a transmitter loopback test circuit, and Figure 11 idl the loopback test result at kbps.

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Guaranteed Minimum Slew Rate. 322 they activate, the two transmitter outputs properly go to opposite Idl levels, with no glitching, ringing, nor undesirable transients. F; Unless Otherwise Speci? This micro-power mode makes these devices ideal for battery powered and portable applications. The static transmitters were also loaded with an RS receiver. The ICLX are 3 driver, 5 receiver devices that provide a complete serial port suitable for laptop or notebook computers.


Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. The already low current requirement drops signi?

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. Active low output that indicates if no valid RS levels are present on any receiver input.

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These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. If in doubt, use capacitors with a larger nominal value.

Standard receivers driving powered down peripherals must be disabled to prevent current? Increasing the capacitor values by a factor of 2 reduces ripple on the transmitter outputs and slightly reduces power consumption. External capacitor voltage doubler is connected to this lead.

Nevertheless, if strictly manual control over powerdown is desired, the user must strap FORCEON high to disable the automatic powerdown circuitry. Inverting receiver outputs may or may not disable in powerdown; refer to Table 2 for details.

The power management logic then uses this indicator to power down the interface block. All devices guarantee a kbps data rate for full load conditions 3k?