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SP237ACS Datasheet(PDF) 9 Page - Sipex Corporation |
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SP237ACS Datasheet(HTML) 9 Page - Sipex Corporation |
9 / 17 page 9 Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers © Copyright 2004 Sipex Corporation Figure 4. Mouse Application Drive Capability 10 9 8 7 6 5 4 3 2 1 0 02468 10 12 18 20 IOL/IOH (mA) 16 14 22 VOL vs IOL VOH vs IOH Figure 5. Parallel Drivers T IN T OUT Wake-Up Feature The SP235B, SP236B, SP240B and SP241B have a wake-up feature that keeps all receivers in an enabled state when the device is in the shutdown mode. Table 2 defines the truth table for the wake-up function. Timing for the wake-up function is shown in Figure 6. If the SP235B, SP236B, SP240B and SP241B are powered up in the shutdown state (SD driven high during V CC power up), the part must remain in a powered on state for a minimum of 3ms before the wake-up function can be used. After the 3ms wait time, there is a 2ms delay time before data is valid for both enable and disable +5V 0V +5V 0V ROUT SD POWER-UP WITH SD HIGH (charge pump section in shutdown state) +5V 0V +5V 0V ROUT SD POWER-UP WITH SD LOW (charge pump section in active mode) tWAIT tENABLE t0 (power up) t0 (power up) +5V 0V +5V 0V ROUT SD EXERCISING WAKE–UP FEATURE t0 (power up) DATA VALID tWAIT DATA VALID DATA VALID DATA VALID DATA VALID tENABLE tENABLE tENABLE SPECIFICATIONS: (VCC =+5V±10%, TA=25°C) PARAMETER MIN. TYP. MAX. tWAIT 2ms 3ms tENABLE 1ms 2ms Figure 6. Wake–Up and Shutdown Timing |
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