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Part: MAX3225EAP
Category:
Interface and Interconnect
Description: MAX3224, MAX3225, MAX3226, MAX3227, MAX3244, MAX3245 1µA Supply Current, 3.0V to 5.5V, 1Mbps RS-232 Transceivers With Autoshutdown Plus
Company: Maxim Integrated Products
Datasheet: Download MAX3225EAP datasheet File size : 259 kB
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Datasheet text preview:
19-1289; Rev 1; 3/98
1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
________________General Description
The MAX3224MAX3227/MAX3244/MAX3245 are 3Vpowered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features and high data-rate capabilities. All devices achieve a 1µA supply current using Maxim's r e v o l u t i o n a r y AutoShutdown PlusTM feature. These d e v i c e s automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receive r input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system. T h e MAX3225/MAX3227/MAX3245 also feature MegaBaudTM operation, guaranteeing 1Mbps for highspeed 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 RS232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a 3.3V supply. The MAX3224MAX3227 feature a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting. All devices are available in a space-saving SSOP package.
____________________________Features
o 1µA Supply Current o AutoShutdown Plus--EDN Innovation of the Year o Guaranteed Data Rate: 250kbps (MAX3224/3226/3244) 1Mbps (MAX3225/3227/3245) o Guaranteed Slew Rate: 6V/µs (MAX3224/3226/3244) 24V/µs (MAX3225/3227/3245) o Meets EIA/TIA-232 Specifications Down to 3.0V o Guaranteed Mouse Driveability (MAX3244/3245) o Ready-to-Transmit Logic-Level Output
MAX3224MAX3227/MAX3244/MAX3245
_______________Ordering Information
PART MAX3224CPP MAX3224CAP MAX3224EPP MAX3224EAP MAX3225CPP MAX3225CAP MAX3225EPP MAX3225EAP TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP
________________________Applications
Notebook, Subnotebook, and Palmtop Computers Cellular Phones Battery-Powered Equipment Hand-Held Equipment Peripherals Printers
Ordering Information continued at end of data sheet.
_____________________ Selector Guide
PART NO. OF GUARANTEED AUTOREADY DRIVERS/ DATA RATE SHUTDOWN OUTPUT RECEIVERS (bps) PLUS 2/2 2/2 1/1 1/1 3/5 3/5 250k 1M 250k 1M 250k 1M -- --
MAX3224 MAX3225 MAX3226 MAX3227 MAX3244 MAX3245
AutoShutdownPlus and MegaBaud are trademarks of Maxim Integrated Products.
Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other patents pending.
________________________________________________________________ Maxim Integrated Products
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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224MAX3227/MAX3244/MAX3245
ABSOLUTE MAXIMUM RATINGS
VCC to GND .....-0.3V to +6V V+ to GND (Note 1) ........-0.3V to +7V V- to GND (Note 1) .........+0.3V to -7V V+ + V-(Note 1) .......+13V Input Voltages T_IN, FORCEON, FORCEOFF to GND ....... -0.3V to +6V R_IN to GND ...........±25V Output Voltages T_OUT to GND....±13.2V R_OUT, INVALID, READY to GND .........-0.3V to (VCC + 0.3V) Short-Circuit Duration T_OUT to GND .......Continuous Continuous Power Dissipation (TA = +70°C) 16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW 20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW 28-Pin Wide SO (derate 12.5mW/°C above +70°C).. 1W 28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW Operating Temperature Ranges MAX32_ _C_ _....0°C to +70°C MAX32_ _E_ _ ........-40°C to +85°C Storage Temperature Range .....-65°C to +160°C Lead Temperature (soldering, 10sec) .....+300°C
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3V to +5.5V, C1C4 = 0.1µF, tested at 3.3V ±10%; CL = 0.047µF, C2C4 = 0.33µF, tested at 5.0V ±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Supply Current, AutoShutdown Plus Supply Current, Shutdown Supply Current, AutoShutdown Plus Disabled LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold Low Input Logic Threshold High Transmitter Input Hysteresis Input Leakage Current Output Leakage Current Output Voltage Low Output Voltage High RECEIVER INPUTS Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance 2 TA = +25°C 3 TA = +25°C TA = +25°C VCC = 3.3V VCC = 5.0V VCC = 3.3V VCC = 5.0V -25 0.6 0.8 1.2 1.5 1.5 1.8 0.5 5 7 2.4 2.4 +25 V V V V k T_IN, FORCEON, FORCEOFF R_OUT (MAX3244/MAX3245), receivers disabled IOUT = 1.6mA IOUT = -1.0mA VCC - 0.6 VCC - 0.1 T_IN, FORCEON, FORCEOFF T_IN, FORCEON, FORCEOFF VCC = 3.3V VCC = 5.0V 2 2.4 0.5 ±0.01 ±0.05 ±1 ±10 0.4 0.8 V V V µA µA V V SYMBOL CONDITIONS FORCEON = GND, FORCEOFF = VCC, all R_IN idle, all T_IN idle FORCEOFF = GND FORCEON = FORCEOFF = VCC, no load MIN TYP MAX UNITS DC CHARACTERISTICS (VCC = 3.3V or 5.0V, TA = +25°C) 1 1 0.3 10 10 1 µA µA mA
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1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V to +5.5V, C1C4 = 0.1µF, tested at 3.3V ±10%; CL = 0.047µF, C2C4 = 0.33µF, tested at 5.0V ±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current VCC = 0 or 3V to 5.5V, VOUT = ±12V, Transmitters disabled All transmitter outputs loaded with 3k to ground VCC = V+ = V- = 0, transmitter outputs = ±2V ±5 300 ±5.4 10M ±60 ±25 V mA µA SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX3224MAX3227/MAX3244/MAX3245
MOUSE DRIVEABILITY (MAX3244/MAX3245) T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3k to GND, T1OUT and T2OUT loaded with 2.5mA each AUTOSHUTDOWN PLUS (FORCEON = GND, FORCEOFF = VCC) Transmitter Output Voltage Receiver Input Threshold to INVALID Output High Receiver Input Threshold to INVALID Output Low INVALID, READY (MAX3224MAX3227) Output Voltage Low INVALID, READY (MAX3224MAX3227) Output Voltage High Receiver Positive or Negative Threshold to INVALID High Receiver Positive or Negative Threshold to INVALID Low Receiver or Transmitter Edge to Transmitters Enabled tINVH tINVL tWU Figure 4a Figure 4a Positive threshold Negative threshold -2.7 -0.3 0.3
±5
V
2.7
V V
IOUT = -1.6mA
0.4
V
IOUT = -1.0mA
VCC - 0.6
V
VCC = 5V, Figure 4b VCC = 5V, Figure 4b VCC = 5V, Figure 5b (Note 2) 15
1 30 100 30 60
µs µs µs sec
Receiver or Transmitter Edge to tAUTOSHDN VCC = 5V, Figure 5b (Note 2) Transmitters Shutdown
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