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MAX3225CAP Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3225CAP Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 19 page _______________Detailed Description Dual Charge-Pump Voltage Converter The MAX3224–MAX3227/MAX3244/MAX3245’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 (MAX3224–MAX3227) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -4V. 1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Pin Description PIN MAX3224 MAX3225 PDIP/ SSIP/ TSSOP TQFN- EP MAX3226 MAX3227 MAX3244 MAX3245 NAME FUNCTION 1 19 1 — READY Ready to Transmit Output, Active High. READY is enabled high when V- goes below -4V and the device is ready to transmit. 2 1 2 28 C1+ Positive Terminal of Voltage-Doubler Charge-Pump Capacitor 3 20 3 27 V+ +5.5V Generated By the Charge Pump 4 2 4 24 C1- Negative Terminal of Voltage-Doubler Charge-Pump Capacitor 5 3 5 1 C2+ Positive Terminal of Inverting Charge-Pump Capacitor 6 4 6 2 C2- Negative Terminal of Inverting Charge-Pump Capacitor 7 5 7 3 V- -5.5V Generated By the Charge Pump 8, 17 6, 15 13 9, 10, 11 T_OUT RS-232 Transmitter Outputs 9, 16 7, 14 8 4–8 R_IN RS-232 Receiver Inputs 10, 15 8, 13 9 15–19 R_OUT TTL/CMOS Receiver Outputs 11 9 10 21 INVALID Valid Signal Detector Output, Active Low. A logic-high indicates that a valid RS-232 level is present on a receiver input. 12, 13 10, 11 11 12, 13, 14 T_IN TTL/CMOS Transmitter Inputs 14 12 12 23 FORCEON Force-On Input, Active High. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on ( FORCEOFF must be high) (Table 1). 18 16 14 25 GND Ground 19 17 15 26 VCC +3.0V to +5.5V Single Supply Voltage 20 18 16 22 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 R2OUTB TTL/CMOS Noninverting Complementary Receiver Outputs. Always active. — — — — EP Exposed Pad (TQFN only). Solder the exposed pad to the ground, or leave unconnected. Maxim Integrated 7 MAX3224–MAX3227/MAX3244/MAX3245 |
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