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ST3243
3 TO 5.5V, 400KBPS, RS-232 TRANSCEIVER WITH AUTO-POWERDOWN
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1A SUPPLY CURRENT ACHIEVED WHEN IN AUTO-POWERDOWN 250Kbps MINIMUM GUARANTEED DATA RATE GUARANTEED 6V/s SLEW RATE RANGE GUARANTEED MOUSE DRIVEABILITY 0.1F EXTERNAL CAPACITORS MEET EIA/TIA-232 SPECIFICATIONS DOWN TO 3V AVAILABLE IN SO-28, SSOP-28 AND TSSOP28
SOP
DESCRIPTION The ST3243 device consists of 3 drivers, 5 receivers and a dual charge-pump circuit. The device meets the requirements of EIA/TIA and V.28/V.24 communication standards providing high data rate capability. The receiver R2 is always active to implement a wake-up feature for serial port. The ST3243 has 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 device is guaranteed to run at data rates of 250kbps while maintaining RS-232 output levels. The Auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is set low, both drivers and receivers (expert R2B) are shut off, and supply current is reduced to 1mA. Disconnecting
SSOP
TSSOP
the serial port or turning off the peripheral drives causes the auto-powerdown condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With Auto-powerdown enabled, the device is activated automatically when a valid signal is applied to any receiver input. Typical application are in notebook, subnotebook, palmtop computers, battery-powered equipment, hand-held equipment, peripherals and printers.
January 2004
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ST3243
ORDERING CODES
Type ST3243CD ST3243BD ST3243CDR ST3243BDR ST3243CPR ST3243BPR ST3243CTR ST3243BTR Temperature Range 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C Package SO-28 (Tube) SO-28 (Tube) SO-28 (Tape & Reel) SO-28 (Tape & Reel) SSOP-28 (Tape & Reel) SSOP-28 (Tape & Reel) TSSOP28 (Tape & Reel) TSSOP28 (Tape & Reel) Comments 27parts per tube / 12tube per box 27parts per tube / 12tube per box 1000 parts per reel 1000 parts per reel 1350 parts per reel 1350 parts per reel 2500 parts per reel 2500 parts per reel
PIN DESCRIPTION
PlN N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 SYMBOL C2 + C2VR1IN R2IN R3IN R4IN R5IN T1OUT T2OUT T3OUT T3IN T2IN T1IN R5OUT R4OUT R3OUT R2OUT R1OUT R2OUTB INVALID FORCEOFF FORCEON C1GND VCC V+ C1 + NAME AND FUNCTION Positive Terminal of Inverting Charge Pump Capacitor Negative Terminal of Inverting Charge Pump Capacitor -5.5V Generated by the Charge Pump First Receiver Input Voltage Second Receiver Input Voltage Third Receiver Input Voltage Fourth Receiver Input Voltage Fifth Receiver Input Voltage First Transmitter Output Voltage Second Transmitter Output Voltage Third Transmitter Output Voltage Third Transmitter Input Voltage Second Transmitter Input Voltage First Transmitter Input Voltage Fifth Receiver Output Voltage Fourth Receiver Output Voltage Third Receiver Output Voltage Second Receiver Output Voltage First Receiver Output Voltage Non-inverting Complementary Receiver Output, always active for wake-up Output of the valid signal detector. Indicates if a valid RS-232 level is present on receiver inputs logic "1" Drive low to shut down transmitters and on-board power supply. This over-rides all automatic circuitry and FORCEON Drive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high) Negative Terminal of Voltage- Charge Pump Capacitor Ground Supply Voltage 5.5V Generated by the Charge Pump Positive Terminal of Voltage- Charge Pump Capacitor
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ST3243
PIN CONFIGURATION
TRUTH TABLE
FORCE OFF 0 1 TOUT HIGH Z ACTIVE * ROUT HIGH Z ACTIVE * R2OUTB ACTIVE * ACTIVE *
* If the part is in auto-powerdown mode (FORCE OFF = VCC, FORCE ON = GND) it is shutdown, if no valid RS-232 levels are present on all receiver input
ABSOLUTE MAXIMUM RATINGS
Symbol VCC V+ Supply Voltage Doubled Voltage Terminal Parameter Value -0.3 to 6 (VCC -0.3) to 7 0.3 to -7 13 -0.3 to 6 25 13.2 -0.3 to (VCC + 0.3) Continuous -65 to 150 C Unit V V V V V V V V
VInverted Voltage Terminal V+ +|V-| FORCEON, Input Voltage FORCEOFF, TIN RIN TOUT Receiver Input Voltage Range Transmitter Output Voltage Range
ROUT ROUTB Receiver Output Voltage Range INVALID tSHORT Short Circuit Duration on TOUT (one at a time) Tstg Storage Temperature Range
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. V+ and V- can have a maximum magnitude of +7V, but their absolute addition can not exceed 13 V. (*) The device doesn't meet 1KV ESD HBM
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ST3243
ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1F, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol Parameter Test Conditions VCC = 3.3 or 5.0V All R_IN open TA = 25C FORCEOFF = VCC Min. Typ. 1 1 0.3 Max. 10 10 1 Unit A A mA IASHDN Supply Current Auto-powerdown ISHDN ISHDN Shutdown Supply Current Supply Current Auto-powerdown Disabled
VCC = 3.3 or 5.0V TA = 25C All R_IN open FORCEOFF = GND VCC = 3.3 or 5.0V TA = 25C FORCEON = FORCEOFF = VCCNo Load
LOGIC INPUT ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1F, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol VTIL VTIH Parameter Input Logic Threshold Low Input Logic Threshold High Test Conditions T-IN, FORCEON, FORCEOFF T-IN, FORCEON, FORCEOFF VCC = 3.3V VCC = 5V 2 2.4 0.5 T-IN, FORCEON, FORCEOFF Receiver Disabled IOUT = 1.6mA IOUT = -1mA VCC-0.6 VCC-0.1 0.01 0.05 1.0 10 0.4 Min. Typ. Max. 0.8 Unit V V V V A A V V
VTHYS IIL IOL VOL VOH
Transmitter Input Hysteresis Input Leakage Current Output Leakage Current Output Voltage Low Output Voltage High
AUTO-POWERDOWN ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1F, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol VRITE VRITD VIOL VIOH tWU tinvh Parameter Receiver Input Threshold to Transmitter Enabled Receiver Input Threshold to Transmitter Disabled INVALID Output Voltage LOW INVALID Output Voltage HIGH Receiver Threshold to Transmitter Enabled Receiver Positive or Negative Threshold to INVALID HIGH Receiver Positive or Negative Threshold to INVALID LOW Test Conditions Positive Threshold Negative Threshold 1A Supply Current Min. 2.7 -0.3 Typ. Max. 2.7 0.3 0.4 VCC-0.6 IOUT = 1.6mA IOUT = -1mA 250 1 Unit V V V V V s s s
tinvL
30
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ST3243
TRANSMITTER ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1F, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol VTOUT ROUT ISC VOT Parameter Output Voltage Swing Output Resistance Output Short Circuit Current Transmitter Output Voltage T1IN = T2IN = GND, T3IN = VCC T3OUT loaded with 3K to GND T1OUT and T2OUT loaded with 2.5mA each 5 Test Conditions All Transmitter outputs are loaded with 3K to GND VCC = V+ = V- = 0V VOUT = 2V Min. 5 300 Typ. 5.4 10M 35 60 Max. Unit V mA V
RECEIVER ELECTRICAL CHARACTERISTICS (C1 - C4 = 0.1F, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol VRIN VRIL VRIH Parameter Receiver Input Voltage Operating Range RS-232 Input Threshold Low RS-232 Input Threshold High Test Conditions Min. -25 TA = 25C TA = 25C TA = 25C TA = 25C TA = 25C VCC = 3.3V VCC = 5.0V VCC = 3.3V VCC = 5.0V 3 0.6 0.8 1.2 1.2 1.5 1.8 0.5 5 7 2.4 2.4 Typ. Max. 25 Unit V V V V K
VRIHYS Input Hysteresis RRIN Input Resistance
TIMING CHARACTERISTICS (C1 - C4 = 0.1F, VCC = 3V to 5.5V, TA = -40 to 85C, unless otherwise specified. Typical values are referred to TA = 25C)
Symbol DR tPHL tPLH Parameter Maximum Data Rate Test Conditions Min. 250 Typ. 400 0.15 100 50 1 Max. Unit Kbps s ns ns s s RL = 3K CL= 1000pF one transmitter switching Receiver Propagation Delay RIN to ROUT CL = 150pF
tT_SKEW Transmitter Skew tR_SKEW Receiver Skew tINVH Receiver Positive or negative Threshold to INVALID HIGH Receiver Positive or negative Threshold to INVALID LOW Transition Slew Rate
tINVL
30
SRT
TA = 25C RL = 3K to 7K VCC = 3.3V measured from +3V to -3V or -3V to +3V CL = 150pF to 1000pF CL = 150pF to 2500pF
6 4
30 30
V/s V/s
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ST3243
APPLICATION CIRCUITS
CAPACITANCE VALUE (F)
VCC 3.0 to 3.6 4.5 to 5.5 3.0 to 5.5 6/14 C1 0.1 0.047 0.22 C2 0.1 0.33 1.0 C3 0.1 0.33 1.0 C4 0.1 0.33 1.0 Cbypass 0.1 0.33 0.22
ST3243
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj = 25C) Figure 1 : INVALID HIGH Threshold Time Figure 4 : Receiver Output Enable & Disable Time
Figure 2 : INVALID LOW Threshold Time
Figure 5 : Output Current vs Output High Voltage
Figure 3 : Receiver Propagation Delay
Figure 6 : Output Current vs Output Low Voltage
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ST3243
SO-28 MECHANICAL DATA
mm. DIM. MIN. A a1 b b1 C c1 D E e e3 F L S 7.40 0.50 17.70 10.00 1.27 16.51 7.60 1.27 0.291 0.020 18.10 10.65 0.1 0.35 0.23 0.5 45 (typ.) 0.697 0.393 0.050 0.650 0.300 0.050 0.713 0.419 TYP MAX. 2.65 0.3 0.49 0.32 0.004 0.014 0.009 0.020 MIN. TYP. MAX. 0.104 0.012 0.019 0.012 inch
8 (max.)
0016023
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ST3243
SSOP28 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.55 0.75 0.050 1.65 0.22 0.09 9.9 7.4 5 10.2 7.8 5.3 0.65 BSC 10 0.95 0 0.022 0.030 1.75 1.85 0.38 0.25 10.5 8.2 5.6 TYP MAX. 2 0.002 0.065 0.009 0.004 0.390 0.291 0.197 0.402 0.307 0.209 0.0256 BSC 10 0.037 0.069 0.073 0.015 0.010 0.413 0.323 0.220 MIN. TYP. MAX. 0.079 inch
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ST3243
TSSOP28 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 9.6 6.2 4.3 9.7 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 9.8 6.6 4.48 0.002 0.031 0.007 0.004 0.378 0.244 0.169 0.382 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.386 0.260 0.176 inch
0128292B
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ST3243
Tape & Reel SO-28 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 10.8 18.2 2.9 3.9 11.9 12.8 20.2 60 30.4 11.0 18.4 3.1 4.1 12.1 0.425 0.716 0.114 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 1.197 0.433 0.724 0.122 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch
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ST3243
Tape & Reel SSOP28 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 8.4 10.7 2.9 3.9 11.9 12.8 20.2 60 22.4 8.6 10.9 3.1 4.1 12.1 0.331 0.421 0.114 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.339 0.429 0.122 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch
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ST3243
Tape & Reel TSSOP28 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.8 10.1 1.7 3.9 11.9 12.8 20.2 60 22.4 7 10.3 1.9 4.1 12.1 0.268 0.398 0.067 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.276 0.406 0.075 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch
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ST3243
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners (c) 2004 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com
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