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MAX3245ECAI Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3245ECAI Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 21 page ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Pin Description (continued) PIN MAX3224E MAX3225E MAX3226E MAX3227E TQFN DIP/ SSOP/ TSSOP TQFN SSOP/ TSSOP MAX3244E MAX3245E SO/ SSOP/ TSSOP MAX3245E TQFN NAME FUNCTION 12 14 9 12 23 25 FORCEON Force-On Input, Active High. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on ( FORCEOFF must be high) (Table 1). 16 18 11 14 25 27 GND Ground 17 19 12 15 26 29 VCC +3.0V to +5.5V Single Supply Voltage 18 20 13 16 22 24 FORCEOFF Force-Off Input, Active Low. Drive low to shut down transmitters, receivers (except R2OUTB), and charge pump. This overrides AutoShutdown Plus and FORCEON (Table 1). — — — — 20 21 R2OUTB TTL/CMOS Noninverting Complementary Receiver Outputs. Always active. — — — — — 6, 10, 14, 18, 22, 28, 32, 36 N.C. No Connection. Not internally connected. — — — — — — EP Exposed Pad. Solder the exposed pad to the ground plane or leave unconnected. _______________Detailed Description Dual Charge-Pump Voltage Converter The MAX3224E–MAX3227E/MAX3244E/MAX3245E’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), over the +3.0V to +5.5V range. The charge pump operates in discontinuous mode: if the output voltages are less than 5.5V, the charge pump is enabled; if the output voltages exceed 5.5V, the charge-pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies. The READY output (MAX3224E–MAX3227E) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -4V. 8 Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E |
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