MAX3226 MAXIM [Maxim Integrated Products], MAX3226 Datasheet
MAX3226
Available stocks
Related parts for MAX3226
MAX3226 Summary of contents
Page 1
... BIOS or operating system. The MAX3225/MAX3227/MAX3245 also feature MegaBaud™ operation, guaranteeing 1Mbps for high- speed applications such as communicating with ISDN modems. The MAX3224/MAX3226/MAX3244 guarantee 250kbps operation. The transceivers have a proprietary low-dropout transmitter output stage enabling true RS- 232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µ ...
Page 2
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0. GND (Note 1) ..................................................-0. GND (Note 1) ...................................................+0. ...
Page 3
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ELECTRICAL CHARACTERISTICS (continued +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10 unless otherwise noted. Typical values are at T PARAMETER SYMBOL TRANSMITTER ...
Page 4
... Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus TIMING CHARACTERISTICS—MAX3224/MAX3226/MAX3244 (V = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10 unless otherwise noted. Typical values are at T PARAMETER SYMBOL Maximum Data Rate t PHL Receiver Propagation Delay t PLH Receiver Output Enable Time Receiver Output Disable Time ...
Page 5
... TEMPERATURE (° +25°C, unless otherwise noted MAX3224/MAX3226 OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE 45 40 250kbps TRANSMITTING AT 250kbps 5 T2 (MAX3224) TRANSMITTING AT 15.6kbps 0 0 1000 2000 3000 5000 LOAD CAPACITANCE (pF) ...
Page 6
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus (V = +3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ and C CC MAX3244 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE OUT+ ...
Page 7
... READY signal asserts high when V- goes below -4V. The transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels. The MAX3224/MAX3226/MAX3244 guarantee a 250kbps data rate (1Mbps for the MAX3225/MAX3227/ MAX3245) with worst-case loads of 3kΩ in parallel with 1000pF, providing compatibility with PC-to-PC com- munication software (such as LapLink™ ...
Page 8
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus POWER- FORCEOFF MANAGEMENT FORCEON UNIT OR KEYBOARD INVALID CONTROLLER MAX3244 MAX3245 I/O CHIP CPU WITH UART Figure 1. Interface Under Control of PMU When FORCEOFF is driven to ...
Page 9
... RS-232 receiver or transmitter input result, the sys- tem saves power without changes to the existing BIOS or operating system. R_OUT (MAX3224/ R_OUT R2OUTB MAX3225/ (MAX3244/ (MAX3244/ MAX3226/ MAX3245) MAX3245) MAX3227) Active High-Z Active Active Active Active Active ...
Page 10
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +0.3V R_IN -0.3V INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30 s. Figure 3a. INVALID Functional Diagram, INVALID Low +2.7V R_IN ...
Page 11
... V- *MAX3224–MAX3227 Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram POWER- MASTER SHDN LINE MANAGEMENT UNIT 0.1 F FORCEOFF MAX3224 MAX3225 MAX3226 MAX3227 MAX3244 MAX3245 Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a Mouse or Another System ______________________________________________________________________________________ t AUTOSHDN t WU when a valid receiver level is detected (same function- ality as AutoShutdown feature on MAX3221/MAX3223/ MAX3243) ...
Page 12
... The MAX3224/MAX3226/MAX3244 maintain the RS-232 ±5.0V minimum transmitter output voltage even at high data rates. Figure 7 shows a transmitter loopback test circuit. Figure 8 shows a loopback test result at 120kbps, and Figure 9 shows the same test at 250kbps. For Figure 8, all transmitters were driven ...
Page 13
... T1IN T1OUT R1OUT s/div Figure 9. MAX3224/MAX3226/MAX3244 Loopback Test Result at 250kbps ______________________________________________________________________________________ The MAX3244/MAX3245 are specifically designed to power serial mice while operating from low-voltage power supplies. They have been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3244/MAX3245 successfully drove all serial mice tested and met their respective current and voltage requirements ...
Page 14
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +3.3V 0 C1 C1- MAX3244 1 C2+ MAX3245 C2 0 C2- T1IN 14 LOGIC T2IN 13 INPUTS T3IN ...
Page 15
... MAX3241 +3.0 to +5.5 MAX3243 +3.0 to +5.5 MAX3244 +3.0 to +5.5 MAX3245 +3.0 to +5.5 MAX3232 +3.0 to +5.5 MAX3222 +3.0 to +5.5 MAX3223 +3.0 to +5.5 MAX3224 +3.0 to +5.5 MAX3225 +3.0 to +5.5 MAX3221 +3.0 to +5.5 MAX3226 +3.0 to +5.5 MAX3227 +3.0 to +5.5 ______________________________________________________________________________________ SUPPLY (V) 3.3 Compatible with all CMOS families 5 Compatible with all TTL and CMOS families 3.3 Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS NO. SUPPLY OF CURRENT Tx/Rx (µA) 3/5 300 ...
Page 16
... Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ___________________________________________________Typical Operating Circuits +3. BYPASS C1 0.1 F C1- MAX3226 5 C2+ MAX3227 C2 6 0.1 F C2- 11 T1IN 9 R1OUT 1 READY AUTOSHUTDOWN PLUS 12 FORCEON GND 14 +3. 0.1 F BYPASS C1 C1- MAX3224 5 C2+ MAX3225 C2 6 0.1 F ...
Page 17
... T1IN T2IN 12 INVALID 11 ___________________Chip Information MAX3224 PIN-PACKAGE TRANSISTOR COUNT: 1129 16 SSOP 16 SSOP MAX3225 16 SSOP TRANSISTOR COUNT: 1129 16 SSOP MAX3226 28 Wide SO TRANSISTOR COUNT: 1129 28 SSOP MAX3227 28 Wide SO TRANSISTOR COUNT: 1129 28 SSOP 28 Wide SO MAX3244/MAX3245 TRANSISTOR COUNT: 1335 28 SSOP 28 Wide SO 28 SSOP C1 ...
Page 18
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ________________________________________________________Package Information 18 ______________________________________________________________________________________ ...
Page 19
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ___________________________________________Package Information (continued) ______________________________________________________________________________________ 19 ...
Page 20
Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ___________________________________________Package Information (continued) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim ...