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ICL3224E Datasheet(PDF) 9 Page - Intersil Corporation |
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ICL3224E Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 20 page 9 The ICL3244E inverting receivers disable during forced (manual) powerdown, but not during automatic powerdown (see Table 2). Conversely, the monitor receiver remains active even during manual powerdown making it 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. TABLE 2. POWERDOWN LOGIC TRUTH TABLE RCVR OR XMTR EDGE WITHIN 30 SEC? FORCEOFF INPUT FORCEON INPUT TRANSMITTER OUTPUTS RECEIVER OUTPUTS (NOTE 3) ROUTB OUTPUTS RS-232 LEVEL PRESENT AT RECEIVER INPUT? INVALID OUTPUT MODE OF OPERATION ICL3224E, ICL3226E NO H H Active Active N.A. NO L Normal Operation (Enhanced Auto Powerdown Disabled) NO H H Active Active N.A. YES H YES H L Active Active N.A. NO L Normal Operation (Enhanced Auto Powerdown Enabled) YES H L Active Active N.A. YES H NO H L High-Z Active N.A. NO L Powerdown Due to Enhanced Auto Powerdown Logic NO H L High-Z Active N.A. YES H X L X High-Z Active N.A. NO L Manual Powerdown X L X High-Z Active N.A. YES H ICL322XE - INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWERDOWN) X NOTE 4 NOTE 4 Active Active N.A. YES H Normal Operation X NOTE 4 NOTE 4 High-Z Active N.A. NO L Forced Auto Powerdown ICL3244E NO H H Active Active Active NO L Normal Operation (Enhanced Auto Powerdown Disabled) NO H H Active Active Active YES H YES H L Active Active Active NO L Normal Operation (Enhanced Auto Powerdown Enabled) YES H L Active Active Active YES H NO H L High-Z Active Active NO L Powerdown Due to Enhanced Auto Powerdown Logic NO H L High-Z Active Active YES H X L X High-Z High-Z Active NO L Manual Powerdown X L X High-Z High-Z Active YES H ICL3244E - INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWERDOWN) X NOTE 4 NOTE 4 Active Active Active YES H Normal Operation X NOTE 4 NOTE 4 High-Z High-Z Active NO L Forced Auto Powerdown NOTES: 3. Applies only to the ICL3244E. 4. Input is connected to INVALID Output. ICL3224E, ICL3226E, ICL3244E |
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