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ISL4243EIR Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL4243EIR Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 14 page 8 FN8037.7 June 10, 2010 ISL4241E and ISL4243E monitor receivers remain active even during manual power-down, making them extremely useful for Ring Indicator monitoring. Standard receivers driving powered down peripherals must be disabled to prevent current flow through the peripheral’s protection diodes (see Figures 2 and 3). This renders them useless for wake-up functions, but the corresponding monitor receiver can be dedicated to this task as shown in Figure 3. Low Power Operation These 3V devices require a nominal supply current of 0.3mA, even at VCC = 5.5V, during normal operation (not in power-down mode). This is considerably less than the 5mA to 11mA current required by comparable 5V RS-232 devices, allowing users to reduce system power simply by switching to this new family. Power-down Functionality The already low current requirement drops significantly when the device enters power-down mode. In power-down, supply current drops to 10nA, because the on-chip charge pump turns off (V+ collapses to VCC, V- collapses to GND), and the transmitter outputs three-state. Inverting receiver outputs disable only in manual power-down; refer to Table 2 for details. This micro-power mode makes the ISL4241E and ISL4243E ideal for battery powered and portable applications. TABLE 2. POWER-DOWN AND ENABLE LOGIC TRUTH TABLE RS-232 SIGNAL PRESENT AT RECEIVER INPUT? SHDN OR FORCEOFF INPUT FORCEON INPUT EN INPUT TRANSMITTER OUTPUTS RECEIVER OUTPUTS ROUTB OUTPUTS INVALID OUTPUT MODE OF OPERATION ISL4241E N.A. L N/A L High-Z Active Active N/A Manual Power-down N.A. L N/A H High-Z High-Z Active N/A Manual Power-down w/Receiver Disabled N.A. H N/A L Active Active Active N/A Normal Operation N.A. H N/A H Active High-Z Active N/A Normal Operation w/Receiver Disabled ISL4243E NO H H N/A Active Active Active L Normal Operation (Auto Power-down Disabled) YES H L N/A Active Active Active H Normal Operation (Auto Power-down Enabled) NO H L N/A High-Z Active Active L Power-down Due to Auto Power-down Logic YES L X N/A High-Z High-Z Active H Manual Power-down NO L X N/A High-Z High-Z Active L Manual Power-down FIGURE 2. POWER DRAIN THROUGH POWERED DOWN PERIPHERAL OLD VCC POWERED GND SHDN = GND VCC Rx Tx VCC CURRENT VOUT = VCC FLOW RS-232 CHIP DOWN UART ISL4241E, ISL4243E |
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