1/14
January 2004s
1µA SUPPLY CURRENT ACHIEVED WHEN IN AUTO-POWERDOWN
运动会闭幕词s
250Kbps MINIMUM GUARANTEED DATA RATE
s GUARANTEED 6V/µs SLEW RATE RANGE s GUARANTEED MOUSE DRIVEABILITY s 0.1µF EXTERNAL CAPACITORS
s
MEET EIA/TIA-232SPECIFICATIONS DOWN TO 3V
s
AVAILABLE IN SO-28,SSOP-28AND TSSOP28
DESCRIPTION
The ST3243device consists of 3drivers,5receivers and a dual charge-pump circuit.The device meets the requirements of EIA/TIA and V.28/V.24communication standards providing high data rate capability.
The receiver R2is always active to implement a wake-up feature for rial port.
The ST3243has a proprietary low-dropout transmitter output stage enabling true RS-232performance 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-232output levels.
The Auto-powerdown feature functions when FORCEON is low and FORCEOFF is high.During this mode of operation,if the device does not n a valid RS-232signal,the driver outputs are disabled.If FORCEOFF is t low,both drivers and receivers (expert R2B)are shut off,and supply current is reduced to 1mA.Disconnecting
the rial port or turning off the peripheral drives caus the auto-powerdown condition to occur.Auto-什么的万里长城
powerdown can be disabled when FORCEON and FORCEOFF are high,and should be done when driving a rial mou.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.
ST3243
3TO 5.5V,400KBPS,RS-232
TRANSCEIVER WITH AUTO-POWERDOWN
ST3243
2/14
ORDERING CODES
PIN DESCRIPTION
Type Temperature Range Package
Comments
马的生活习性ST3243CD 0to 70°C SO-28(Tube)27parts per tube /12tube per box ST3243BD -40to 85°C SO-28(Tube)27parts per tube /12tube per box
ST3243CDR 0to 70°C SO-28(Tape &Reel)1000parts per reel ST3243BDR -40to 85°C SO-28(Tape &Reel)1000parts per reel ST3243CPR 0to 70°C SSOP-28(Tape &Reel)1350parts per reel ST3243BPR -40to 85°C SSOP-28(Tape &Reel)1350parts per reel ST3243CTR 0to 70°C TSSOP28(Tape &Reel)2500parts per reel ST3243BTR
-40to 85°C
TSSOP28(Tape &Reel)
2500parts per reel
PlN N°SYMBOL NAME AND FUNCTION
1C 2+Positive Terminal of Inverting Charge Pump Capacitor 2C 2-Negative Terminal of Inverting Charge Pump Capacitor 3V--5.5V Generated by the Charge Pump 4R1IN First Receiver Input Voltage 5R2IN Second Receiver Input Voltage 6R3IN Third Receiver Input Voltage 7R4IN Fourth Receiver Input Voltage 8R5IN Fifth Receiver Input Voltage 9T1OUT First Transmitter Output Voltage 10T2OUT Second Transmitter Output Voltage 11T3OUT Third Transmitter Output Voltage 12T3IN Third Transmitter Input Voltage 13T2IN Second Transmitter Input Voltage 14T1IN First Transmitter Input Voltage 15R5OUT Fifth Receiver Output Voltage 16R4OUT Fourth Receiver Output Voltage 17R3OUT Third Receiver Output Voltage 18R2OUT Second Receiver Output Voltage 19R1OUT First Receiver Output Voltage
20R2OUTB Non-inverting Complementary Receiver Output,always active for wake-up
21INVALID Output of the valid signal detector.Indicates if a valid RS-232level is prent on receiver inputs logic "1"
22FORCEOFF Drive low to shut down transmitters and on-board power
supply.This over-rides all automatic circuitry and FORCEON 23FORCEON
Drive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high)
24C 1-Negative Terminal of Voltage-Charge Pump Capacitor 25GND Ground
26V CC Supply Voltage
27V+ 5.5V Generated by the Charge Pump
28
C 1+
Positive Terminal of Voltage-Charge Pump Capacitor
ST3243
3/14
PIN CONFIGURATION
TRUTH TABLE
*If the part is in auto-powerdown mode (FORCE OFF =V CC ,FORCE ON =GND)it is shutdown,if no
valid RS-232levels are prent on all receiver input
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are tho values beyond which damage to the device may occur.Functional operation under the condition is not implied.V+and V-can have a maximum magnitude of +7V,but their absolute addition can not exceed 13V.(*)The device doesn’t meet 1KV ESD HBM
FORCE OFF
T OUT R OUT R 2OUTB 0HIGH Z HIGH Z ACTIVE *1
ACTIVE *
ACTIVE *
ACTIVE *
Symbol Parameter
Value Unit V CC Supply Voltage
-0.3to 6V V+
Doubled Voltage Terminal
(V CC -0.3)to 7V V-Inverted Voltage Terminal
0.3to -7V V++|V-|
13V FORCEON,FORCEOFF,
T IN
Input Voltage -0.3to 6V R IN Receiver Input Voltage Range ± 25V T OUT
Transmitter Output Voltage Range
± 13.2V R OUT R OUTB INVALID Receiver Output Voltage Range -0.3to (V CC +0.3)
V
t SHORT Short Circuit Duration on T OUT (one at a time)
Continuous T stg
Storage Temperature Range
-65to 150
°C
ST3243
4/14
ELECTRICAL CHARACTERISTICS
(C 1-C 4=0.1µF,V CC =3V to 5.5V,T A =-40to 85°C,unless otherwi specified.Typical values are referred to T A =25°C)
LOGIC INPUT ELECTRICAL CHARACTERISTICS
(C 1-C 4=0.1µF,V CC =3V to 5.5V,T A =-40to 85°C,unless otherwi specified.Typical values are referred to T A =25°C)
AUTO-POWERDOWN ELECTRICAL CHARACTERISTICS
(C 1-C 4=0.1µF,V CC =3V to 5.5V,T A =-40to 85°C,unless otherwi specified.Typical values are referred to T A =25°C)
Symbol
Parameter
Test Conditions
Min.
Typ.Max.Unit I ASHDN Supply Current
Auto-powerdown V CC =3.3or 5.0V T A =25°C
All R_IN open
FORCEOFF =V CC
110µA I SHDN Shutdown Supply Current V CC =3.3or 5.0V T A =25°C All R_IN open FORCEOFF =GND 110µA I SHDN
Supply Current
Auto-powerdown Disabled
V CC =3.3or 5.0V T A =25°C
FORCEON =FORCEOFF =V CC No Load
0.3
1
mA
Symbol Parameter
Test Conditions
Min.
Typ.
Max.Unit V TIL Input Logic Threshold Low T-IN,FORCEON,FORCEOFF 0.8
V V TIH
Input Logic Threshold High
T-IN,FORCEON,FORCEOFF V CC =3.3V V CC =5V
22.4
V V V THYS Transmitter Input Hysteresis
微波炉图片0.5
V I IL Input Leakage Current T-IN,FORCEON,FORCEOFF ± 0.01± 1.0µA I OL Output Leakage Current Receiver Disabled ± 0.05
± 10µA V OL Output Voltage Low I OUT =1.6mA 0.4
V V OH
Output Voltage High
I OUT =-1mA
V CC -0.6V CC -0.1
V
Symbol Parameter
Test Conditions
Min.Typ.
Max.Unit V RITE Receiver Input Threshold to Transmitter Enabled
Positive Threshold Negative Threshold 2.7 2.7V V V RITD Receiver Input Threshold to Transmitter Disabled 1µA Supply Current
-0.3
win10自动关机设置
0.3V V IOL INVALID Output Voltage LOW
0.4
V V IOH INVALID Output Voltage HIGH
V CC -0.6
小学数学练习题
V t WU Receiver Threshold to Transmitter Enabled I OUT =1.6mA 250µs t invh Receiver Positive or Negative Threshold to INVALID HIGH
I OUT =-1mA
1
µs
t invL
Receiver Positive or Negative Threshold to INVALID LOW
30µs
ST3243
5/14
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C 1-C 4=0.1µF,V CC =3V to 5.5V,T A =-40to 85°C,unless otherwi specified.Typical values are referred to T A =25°C)
辣椒炒茄子RECEIVER ELECTRICAL CHARACTERISTICS
(C 1-C 4=0.1µF,V CC =3V to 5.5V,T A =-40to 85°C,unless otherwi specified.Typical values are referred to T A =25°C)
TIMING CHARACTERISTICS
(C 1-C 4=0.1µF,V CC =3V to 5.5V,T A =-40to 85°C,unless otherwi specified.Typical values are referred to T A =25°C)
Symbol Parameter
Test Conditions
Min.Typ.Max.
Unit V TOUT Output Voltage Swing All Transmitter outputs are loaded with 3K Ωto GND
± 5± 5.4V R OUT Output Resistance
V CC =V+=V-=0V V OUT =±2V
300
10M ΩI SC Output Short Circuit Current ± 35
± 60mA V OT
Transmitter Output Voltage
T1IN =T2IN =GND,T3IN =V CC T3OUT loaded with 3K Ωto GND T1OUT and T2OUT loaded with 2.5mA each
± 5
V
Symbol Parameter
Test Conditions
Min.Typ.
Max.Unit V RIN Receiver Input Voltage Operating Range
-25
25
V V RIL RS-232Input Threshold Low
T A =25°C V CC =3.3V T A =25°C V CC =5.0V 0.60.8
1.21.2V V RIH
RS-232Input Threshold High
实习单位鉴定怎么写
T A =25°C V CC =3.3V T A =25°C V CC =5.0V
1.51.8
2.42.4
V V RIHYS Input Hysteresis 0.5V R RIN
Input Resistance
T A =25°C
35
7K Ω
Symbol Parameter
Test Conditions
Min.Typ.Max.
Unit D R Maximum Data Rate
R L =3K ΩC L =1000pF one transmitter switching
250
400Kbps t PHL t PLH
Receiver Propagation Delay R IN to R OUT C L =150pF
0.15µs t T_SKEW Transmitter Skew 100ns t R_SKEW Receiver Skew 50ns t INVH Receiver Positive or negative Threshold to INVALID HIGH
1
µs
t INVL Receiver Positive or negative Threshold to INVALID LOW
30µs
S RT
Transition Slew Rate
T A =25°C R L =3K to 7K Ω V CC =3.3V measured from +3V to -3V or -3V to +3V C L =150pF to 1000pF C L =150pF to 2500pF
643030V/µs V/µs
ST3243
6/14
APPLICATION CIRCUITS
CAPACITANCE VALUE (µF)
V CC C1C2C3C4Cbypass 3.0to 3.60.10.10.10.10.14.5to 5.50.0470.330.330.330.333.0to 5.50.22
1.0
1.0
1.0
0.22
