поискавой системы для электроныых деталей |
|
ISL3232EIRZ датащи(PDF) 8 Page - Intersil Corporation |
|
ISL3232EIRZ датащи(HTML) 8 Page - Intersil Corporation |
8 / 14 page 8 FN6045.3 February 13, 2008 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 (Excluding ISL3232E) The already low current requirement drops significantly when the device enters power-down mode. In power-down, supply current drops to 150nA because the on-chip charge pump turns off (V+ collapses to VCC, V- collapses to GND) and the transmitter outputs three-state. Receiver outputs are unaffected by power-down; refer to Table 2 for details. This micro-power mode makes the ISL4221E, ISL4223E ideal for battery-powered and portable applications. Software Controlled (Manual) Power-down The ISL4221E, ISL4223E family provides pins that allow the user to force the IC into the low power, standby state. The ISL4221E, ISL4223E utilize a two pin approach where the FORCEON and FORCEOFF inputs determine the IC’s mode. For always enabled operation, FORCEON and FORCEOFF are both strapped high. To switch between active and power-down modes, under logic or software control, only the FORCEOFF input need be driven. The FORCEON state isn’t critical, as FORCEOFF dominates over FORCEON. Nevertheless, if strictly manual control over power-down is desired, the user must strap FORCEON high to disable the automatic power-down circuitry. Connecting FORCEOFF and FORCEON together disables the automatic power-down feature, enabling them to function as a manual SHUTDOWN input (see Figure 4). The time to recover from automatic power-down mode is typically 100µs. TABLE 2. POWER-DOWN AND ENABLE LOGIC TRUTH TABLE (EXCLUDING ISL3232E) RS-232 SIGNAL PRESENT AT RECEIVER INPUT? FORCEOFF INPUT FORCEON INPUT EN INPUT TRANSMITTER OUTPUTS RECEIVER OUTPUTS INVALID OUTPUT MODE OF OPERATION NO H H L Active Active L Normal Operation (Auto Power-down Disabled) NO H H H Active High-Z L YES H L L Active Active H Normal Operation (Auto Power-down Enabled) YES H L H Active High-Z H NO H L L High-Z Active L Power-down Due to Auto Power-down Logic NO H L H High-Z High-Z L YES L X L High-Z Active H Manual Power-down YES L X H High-Z High-Z H Manual Power-down w/Rcvr. Disabled NO L X L High-Z Active L Manual Power-down NO L X H High-Z High-Z L Manual Power-down w/Rcvr. Disabled FIGURE 4. CONNECTIONS FOR MANUAL POWER-DOWN WHEN NO VALID RECEIVER SIGNALS ARE PRESENT PWR FORCEOFF INVALID CPU I/O FORCEON ISL4221E, ISL4223E MGT LOGIC UART FIGURE 5. CIRCUIT TO PREVENT AUTO POWER-DOWN FOR 100ms AFTER FORCED POWER-UP ISL4221E, ISL4223E FORCEOFF FORCEON POWER MASTER POWER-DOWN LINE 1M Ω 0.1µF MANAGEMENT UNIT ISL3232E, ISL4221E, ISL4223E |
Аналогичный номер детали - ISL3232EIRZ |
|
Аналогичное описание - ISL3232EIRZ |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |