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ISL3243EIRZ Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL3243EIRZ Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 16 page  9 FN6768.1 May 13, 2010 ISL324xE monitor receivers remain active even during manual powerdown, 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 5 and 6). This renders them useless for wake up functions, but the corresponding monitor receiver can be dedicated to this task as shown in Figure 6. Low Power Operation These 3V devices require a nominal supply current of 0.3mA, even at VCC = 3.6V, 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 powerdown mode. In powerdown, supply current drops to less than 1µA, 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 powerdown (ISL3243E) or when EN = VL (ISL3241E); refer to Table 2 for details. This micro-power mode makes the ISL324xE ideal for battery powered and portable applications. TABLE 2. POWER-DOWN AND ENABLE LOGIC TRUTH TABLE (NOTE: “H” = VL) 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 ISL3241E 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/Rcvr. 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/Rcvr. Disabled ISL3243E NO H H N.A. Active Active Active L Normal Operation (Auto Powerdown 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 5. POWER DRAIN THROUGH POWERED DOWN PERIPHERAL OLD VCC POWERED GND SHDN = GND VCC Rx Tx CURRENT VOUT = VCC FLOW RS-232 CHIP DOWN UART VCC ISL3241E, ISL3243E |
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