ICL 3222 PDF

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External capacitor voltage doubler is connected to this lead. Standard receivers driving powered down peripherals must be disabled to prevent current? This renders them useless for wake up functions, but the corresponding monitor receiver can be dedicated to this task as shown in Figure 3. A mouse, or other application, may need more 322 to wake up from shutdown.

The static transmitters were also loaded with an RS receiver.

ICL receivers disable during forced manual powerdown, but not during automatic powerdown see Table 2. VCC With any of the above control schemes, the time required to exit powerdown, and resume transmission is only ? Active low input to shut down transmitters and on-board power supply, to place device in low power mode.

Guaranteed Minimum Data Rate. 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. Nevertheless, if strictly manual control over powerdown is desired, the user must strap 32222 high to disable the automatic powerdown cil.

The charge pump, the transmitters, and the receivers. As they activate, the two transmitter outputs properly go to opposite RS levels, with no glitching, ringing, 3222 undesirable transients.


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Inverting receiver outputs may or may not disable in powerdown; refer to Table 2 for details. In powerdown, supply current drops to 1? Connect the bypass capacitor as close as possible to the Kcl. This micro-power mode makes these devices ideal for battery powered and portable applications. External capacitor voltage inverter is connected to this lead. In the case of a disconnected interface cable where all the receiver inputs are?

2322 this test, all transmitters were simultaneously driving RS loads in parallel with pF, at kbps. These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. The ICLX are 3 driver, 5 receiver devices that provide a complete serial port suitable for laptop or notebook computers.

Connect unused inputs to GND for the best performance. F; Unless Otherwise Speci? Increasing the capacitor values by a factor of 2 reduces ripple on the transmitter outputs and slightly reduces power consumption.

ico The circuit is divided into three sections: For other supply voltages refer to Table 3 for capacitor values. Driving EN high disables all the inverting standard receiver outputs placing them in a high impedance state.

RS compatible receiver inputs. Each transmitter is loaded with 3k? Figure 12 shows the loopback results for a single transmitter driving pF and an RS load at kbps. 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. This family is fully compatible with 3. 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.


F bypass capacitor is adequate. F capacitors for 3. The specification table lists a minimum of kbps to maintain complete compatibility with competitor data sheets.

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Capacitor Selection The charge pumps require 0. This gives the slow-to-wake peripheral circuit time to reestablish valid RS output ocl. When no valid RS voltages see Figure 6 are sensed on any receiver 2322 for 30? Low Supply Current in Powerdown State. Reconnecting the cable restores valid levels at the receiver inputs, INVALID switches high, and the power management logic wakes up the interface block.

ICLX monitor receivers remain active even during manual powerdown and forced receiver disable, making them extremely useful for Ring Indicator monitoring.

Data rates greater than kbps are guaranteed at worst case load conditions. Note that all the receiver outputs remain enabled during shutdown see Table 2. 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? When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature.

Figure 9 shows the transmitter output voltages under increasing load current. These devices power up again when a valid RS voltage is applied to any receiver input.