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Active low output that indicates if no valid RS levels are present on any receiver input. For this test, all transmitters were simultaneously driving RS loads in parallel with pF, at kbps. Except for the ICL, all transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode see Table 2. 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 automatic powerdown feature provides additional system power savings without changes to the existing 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. Guaranteed Minimum Data Rate. Inverting receiver outputs may or may not disable in powerdown; refer to Table 2 for details. The circuit is divided into three sections: VCC With any of the above control schemes, the time required to exit powerdown, and resume transmission is only ?
Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Driving EN high disables all the inverting standard receiver outputs placing them in a high impedance state.
If in doubt, use capacitors with a larger nominal value. Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. Note that the transmitters enable only when the magnitude of the supplies exceed approximately 3V.
Nevertheless, if strictly manual control over powerdown is desired, the user must strap FORCEON high to disable the automatic powerdown circuitry.
External capacitor voltage doubler is connected to this lead. All Transmitter Outputs Loaded with 3k? The already low current requirement drops signi? Reconnecting the cable restores valid levels at the receiver inputs, INVALID switches high, and the power management logic wakes up the interface block. Low Supply Current in Powerdown State. Note that all the receiver outputs remain enabled during shutdown see Table 2.
Аналоги для «3222»
Standard receivers driving powered down peripherals must be disabled to prevent current? Table 2 summarizes the automatic powerdown functionality.
Figure 10 details a transmitter loopback test circuit, and Figure 11 illustrates the loopback test result at kbps. F capacitors for 3. The power management logic then uses this indicator to power down the interface block.
Figure 12 shows the loopback results for a single transmitter driving pF and an RS load at kbps.
Guaranteed Minimum Slew Rate. In the case of a disconnected interface cable where all the receiver inputs are? As they activate, the two transmitter outputs properly go to opposite RS levels, with no glitching, ringing, nor undesirable transients. Internally generated negative transmitter supply When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature.
For other supply voltages refer to Table 3 for capacitor values. 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.
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When no valid RS ilc see Figure 6 are sensed on any receiver input for 30? These devices power up again when a valid RS voltage is applied to any receiver input. 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. Data rates greater than kbps are guaranteed at worst case load conditions.
Increasing the capacitor values by a factor of 2 reduces ripple on the transmitter outputs and slightly reduces power consumption. ICLX monitor receivers remain active even during manual powerdown and forced receiver disable, making them extremely useful for Ring Indicator monitoring.
Each transmitter is loaded with 3k? 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.
Active low input to shut down transmitters and on-board power supply, to place device in low power mode. INVALID operates in all modes forced or automatic powerdown, or forced onso it is also useful for systems employing manual powerdown circuitry.
External capacitor voltage inverter is connected to this lead. The charge pump, the transmitters, and the receivers. 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? ICL receivers disable during forced manual powerdown, but not during automatic powerdown see Table 2.
This micro-power mode makes these devices ideal for battery powered and portable applications. This family is fully compatible with 3.