ICL 3222 PDF

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In the case of a disconnected interface cable where all the receiver inputs are? Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Figure 5 illustrates a circuit that keeps the ICL32XX from initiating automatic powerdown for ms after powering up. For other supply voltages refer to Table 3 for capacitor values.

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All devices guarantee a kbps data rate for full load conditions 3k? When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature. Data rates greater than kbps are guaranteed at worst case load conditions.

This gives the slow-to-wake peripheral circuit time to reestablish valid RS output levels. The charge pump, the transmitters, and the receivers. Internally generated negative transmitter supply Figure 10 details a transmitter loopback test circuit, and Figure 11 illustrates the loopback test result at kbps.


ICL receivers disable during forced manual powerdown, but not during automatic powerdown see Table 2. RS compatible receiver inputs.

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 block should power down. Ifl devices power up again when a valid RS voltage is applied to any receiver input.

Note that the transmitters enable only when 322 magnitude of the supplies exceed approximately 3V. External capacitor voltage doubler is connected to this lead.

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Guaranteed Minimum Data Rate. The ICLX are 3 driver, 5 receiver devices that provide a complete serial port suitable for laptop or notebook computers. This automatic powerdown feature provides additional system power savings without changes to the existing operating system. Inverting receiver outputs may or may not disable in powerdown; refer to Table 2 for details.

This renders them useless for wake up functions, but the corresponding monitor receiver can be dedicated to this task as shown in Figure 3.

Increasing the capacitor values by a factor of 2 reduces ripple on the transmitter outputs and slightly reduces power consumption. All Transmitter Outputs Loaded with 3k?

Connect the bypass capacitor as close as possible to the IC. INVALID operates in all modes forced or automatic powerdown, or forced onso it is also useful for systems employing manual powerdown circuitry. F capacitors for 3.


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Low Supply Current in Powerdown State. As they activate, the two transmitter outputs properly go to opposite RS levels, with no glitching, ringing, nor undesirable transients.

Reconnecting the cable restores valid levels at the receiver inputs, INVALID switches high, and the power management logic wakes up the interface block.

F bypass capacitor is adequate. These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

ICLX 3222 receivers remain active even during manual powerdown and forced receiver disable, making them extremely useful for Ring Indicator monitoring. 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. Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. The power management logic then uses this indicator to power down the interface block.

When no valid RS voltages see Figure 6 are sensed on any receiver input for 30? Figure 12 shows the loopback results for a single transmitter driving pF and an RS load at kbps.

Each transmitter is loaded with 3k?