SP3282EBCY/TR [SIPEX]
Intelligent +2.35V to +5.5V RS-232 Transceivers; 智能+ 2.35V至+ 5.5V的RS- 232收发器
| 型号： | SP3282EBCY/TR |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Intelligent +2.35V to +5.5V RS-232 Transceivers |
| 文件： | 总15页 (文件大小：306K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
Preliminary
SP3282EB
Intelligent +2.35V to +5.5V RS-232 Transceivers
FEATURES
■ Operates over entire Li+ Battery range
■ Interoperable with EIA/TIA-232-F and
adheres to EIA/TIA-562 down to a
+2.35V power supply
■ AUTO ON-LINE® circuitry automatically
wakes up from a 1µA shutdown
1
2
3
4
5
6
7
28
27
26
25
24
C2+
GND
C2-
V-
C1+
V+
VCC
C1-
T IN
1
T OUT
1
SP3282EB
23 T IN
2
T OUT
2
22
T OUT
3
T IN
3
■ Minimum 250Kbps data rate
R IN
1
8
9
21 R OUT
1
■ Regulated charge pump yields stable
RS-232 outputs regardless of VCC
variations
R IN
2
20
R OUT
2
10
T OUT
4
19 T IN
4
R3IN 11
T OUT
18
17
16
R OUT
3
■ Unique V for low logic compatibility
T IN
5
12
5
regardlesLs of VCC
ONLINE 13
V
L
■ Enhanced ESD Specifications for all
SHUTDOWN 14
15
STATUS
TTL and RS-232 I/O lines.
+15kV Human Body Model
Now Available in Lead Free Packaging
+15kV IEC1000-4-2 Air Discharge
+8kV IEC1000-4-2 Contact Discharge
APPLICATIONS
■ Cell phone data cables
■ PDAs, PDA cradles
■ Hand held equipment
■ Enhanced battery life as the VCC drops
below 3.1V
■ Peripherals
DESCRIPTION
The SP3282EB device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers, PDAs, cell phones and their data cables
and cradles.
The SP3282EB is compatible with low voltage logic down to 1.8V using a logic select pin (VL)
which conditions the logic inputs and outputs to be compatible with system logic.
The SP3282EB uses an internal high-efficiency, charge-pump power supply that requires only
0.1µF capacitors in 3.3V operation. This charge pump and Sipex's driver architecture allow the
SP3282EB device to deliver compliant RS-232 performance from a single +3.3V to +5.5Vpower
supply and additionally adhere to EIA/TIA-562 driver outputs levels down to a power supply
voltage of 2.35V.
The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shutdown
state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise,
the device automatically shuts itself down drawing less than 1µA.
TABLE 1
Device
Power
Supplies
2.35V to 5.5V
RS-232
Drivers Receivers
RS232
External
Components
4
AUTO ON-LINE®
Circuitry
Data
Rate
No. of
Pins
SP3282EB
5
3
yes
250kbps 28
Applicable U.S. Patents - 5,306,954; and 6,378,026.
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability and cause permanent damage to the
device.
TxIN, ONLINE, SHUTDOWN, .............0.3V to +6.0V
RxIN..................................................................+25V
Output Voltages
TxOUT............................................................+13.2V
RxOUT, STATUS.......................-0.3V to (VL + 0.3V)
Short-Circuit Duration
TxOUT.....................................................Continuous
V
CC......................................................-0.3V to +6.0V
Storage Temperature......................-65°C to +150°C
Power Dissipation per package
28-pin SSOP
V+ (note 1).........................................-0.3V to +7.0V
V- (note 1)..........................................+0.3V to -7.0V
V+ + |V-| (note 1).............................................+13V
(derate 11.2mW/oC above +70oC)............900mW
28-pin TSSOP
ICC (DC VCC or GND current).........................+100mA
(derate 13.2mW/oC above +70oC).........1100mW
Input Voltages
VL........................................................-0.3V to +6.0V
ELECTRICAL CHARACTERISTICS
VCC = +2.35 to +5.5V, VL=+1.8 to +5.5V, C1 - C4 = 0.22µF.
TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC=VL=+3.3V, and TA = +25°C.)
PARAMETER
MIN.
TYP.
MAX. UNITS
CONDITIONS
SUPPLY CURRENT
Supply Current,
AUTO ON-LINE
1.0
10
10
µA
µA
All RxIN open, all TxIN at VLor GND,
VCC=VL=+3.3V, TA=25°C
ONLINE = GND, SHUTDOWN = VL,
®
Supply Current, Shutdown
1.0
0.3
All RxIN open, all TxIN at VL or GND
VCC=VL=+3.3V, TA=25°C
ONLINE = VL or GND, SHUTDOWN =
GND
Supply Current,
AUTO ON-LINE Disabled
1.0
mA
All TxIN at VL or GND, ONLINE = VL,
VCC=VL=+3.3V, TA=25°C
®
SHUTDOWN = VL,no load
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold LOW
TxIN, ONLINE, SHUTDOWN
VL = +3.3V or +5.0V
VL = +2.5V
0.8
0.6
0.4
V
V
VL = +1.8V
Input Logic Threshold HIGH
TxIN, ONLINE, SHUTDOWN
VL = +5.0V
VL = +3.3V
2.4
2.0
1.4
VL = +2.5V
0.9
VL = +1.8V
Transmitter Input Hysteresis
Input Leakage Current
0.3
V
±0.01
±1.0
±10
µA
TxIN, ONLINE, SHUTDOWN,
TA = 25°C
Output Leakage Current
Output Voltage LOW
±0.05
µA
RxOUT, Receivers disabled
0.4
0.4
V
IOUT = +1.6mA, VL=2.5V, 3.3V, or 5.0V
IOUT = +0.8mA, VL=1.8V
Output Voltage HIGH
VL - 0.6 VL - 0.1
VL - 0.6 VL - 0.1
V
IOUT = -1.0mA, VL=2.5V, 3.3V, 5.0V
IOUT = -0.5mA, VL=1.8V
DRIVER OUTPUTS
VCC Mode Switch Point
(VCC is Falling)
2.95
3.3
3.1
3.5
3.25
3.7
V
V
TxOUT=±5.0V to ±3.7V
TxOUT=±3.7V to ±5.0V
VCC Mode Switch Point
(VCC is Rising)
VCC Mode Switch Point
Hysteresis
400
mV
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
VCC = +2.35 to +5.5V, VL=+1.8 to +5.5V, C1 - C4 = 0.22µF.
TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC=VL=+3.3V, and TA = +25°C.)
PARAMETER
MIN.
TYP.
MAX. UNITS
CONDITIONS
Output Voltage Swing
All driver outputs loaded with 3KΩ to
GND, TA=25°C
±5.0
+/-3.7
±5.4
V
VCC=3.25V to 5.5V,
VCC=2.35 to 2.95V,
Output Resistance
300
Ω
VCC = V+ = V- = 0V, VTXOUT = ±2V
Output Short-Circuit Current
Ouput Leakage Current
±35
±60
mA
VTXOUT = GND
+/-25
µA
VTXOUT=+/-12V, transmitter disabled,
VCC=0V or 2.35V to 5.5V
RECEIVER INPUTS
Input Voltage Range
-25
25
V
V
Input Threshold
LOW
0.3
0.6
0.8
0.8
1.2
1.5
VL=1.8V, TA=25°C
VL=2.5V or 3.3V, TA=25°C
VL=5.0V, TA=25°C
HIGH
1.0
1.5
1.8
1.8
2.4
2.4
V
VL=1.8V, TA=25°C
VL=2.5V or 3.3V, TA=25°C
VL=5.0V, TA=25°C
Input Hysteresis
0.3
5
V
Input Resistance
3
7
kΩ
TA=25°C
®
AUTO ON-LINE CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = VCC
STATUS Output Voltage
)
LOW
0.4
V
IOUT = 1.6mA, VL=2.5V, 3.3V, 5.0V
or IOUT = +0.8mA, VL=1.8V
HIGH
VL - 0.6 VL-0.1
200
IOUT = -1.0mA, VL=2.5V, 3.3V, 5.0V
or IOUT = -0.5mA, VL=1.8V
Receiver Threshold to Drivers
µs
Enabled (tONLINE
)
Receiver +/- Threshold
to Status HIGH (tSTSH
)
20
20
µs
µs
to Status LOW (tSTSL
AC Characteristics
Maximum Data Rate
)
250
kbps
SP3282EB: RL = 3kΩ, CL = 1000pF,
one driver switching
Receiver Propagation Delay
Receiver input to output, CL = 150pF
t
t
0.15
0.15
µs
PHL
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Time to Exit Shutdown
200
200
100
100
50
ns
ns
µs
ns
ns
Normal operation
Normal operation
|VTXOUT|>3.7V, VCC=3.3V
Measured at zero crossover
Measured at zero crossover
Driver Skew |tPHL-tPLH
|
Receiver Skew |tPHL-tPLH
|
Transition-Region Slew Rate
VCC = 3.3V, RL = 3kΩ to 7kΩ ,
TA = 25°C, measurements taken from
-3.0V to+3.0V or +3.0V to -3.0V
CL = 150pF to 1000pF
30
V/µs
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
3
PIN DESCRIPTION
NAME
C2+
FUNCTION
PIN NO.
Positive terminal of the symmetrical charge-pump capacitor C2.
Ground.
1
2
GND
C2-
Negative terminal of the symmetrical charge-pump capacitor C2.
Regulated -4.0V or -5.5V output generated by the charge pump.
RS-232 driver output.
3
V-
4
T1OUT
T2OUT
T3OUT
R1IN
5
RS-232 driver output.
6
RS-232 driver output.
7
RS-232 receiver input.
8
R2IN
RS-232 receiver input.
9
T4OUT
R3IN
RS-232 driver output.
10
11
12
RS-232 receiver input.
T5OUT
ONLINE
RS-232 driver output.
®
Apply logic HIGH to override AUTO ON-LINE circuitry keeping drivers active
(SHUTDOWN must also be logic HIGH, refer to Table 2).
Apply logic LOW to shut down drivers and charge pump.
13
SHUTDOWN
®
This overrides all AUTO ON-LINE circuitry and ONLINE (refer to Table 2).
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
STATUS
VL
TTL/CMOS Output indicating if a RS-232 signal is present on any Rx input.
Logic level supply voltage selection
TTL/CMOS driver input.
T5IN
R3OUT
T4IN
TTL/CMOS receiver output.
TTL/CMOS driver input.
R2OUT
R1OUT
T3IN
TTL/CMOS receiver output.
TTL/CMOS receiver output.
TTL/CMOS driver input.
T2IN
TTL/CMOS driver input.
T1IN
TTL/CMOS driver input.
C1-
Negative terminal of the symmetrical charge-pump capacitor C1.
+2.35V to +5.5V supply voltage.
VCC
V+
Regulated +4.0V or +5.5V output generated by the charge pump.
Positive terminal of the symmetrical charge-pump capacitor C1
C1+
Table 2. Device Pin Description
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
4
TYPICAL PERFOMANCE CHARACTERISTICS
Unless otherwise noted, the following perfomance characteristics apply for VCC = +4.2V, 250kbps data rate, all drivers loaded with 3kΩ, 0.22µF charge
pump capacitors, and TAMB = +25°C.
VCC
+
+
26
CC
0.1µF
0.1µF
C5
C1
V
1
2
3
4
5
6
7
28
27
26
25
24
23
C2+
GND
C2-
V-
C1+
V+
28
27
4
C1+
C1-
V+
V-
+
+
C3
C4
0.1µF
0.1µF
25
1
VCC
C2+ SP3282EB
+
C2
0.1µF
C1-
IN
3
C2-
T1IN
T2IN
T
1OUT
T
5
T
T
OUT
24
23
1
1
SP3282EB
T
2OUT
6
T
IN
OUT
2
2
T
3OUT
T
3IN
T4IN
5IN
22
19
17
7
RS-232
OUTPUTS
TTL/CMOS
INPUTS
22
T
OUT
T
IN
3
3
T4OUT
10
12
T
5OUT
T
R
IN
IN
8
9
21
20
19
18
17
16
R OUT
1
1
R
R
OUT
2
2
R1IN
R2IN
R3IN
R1OUT
R2OUT
R3OUT
21
20
18
8
9
10
T
T
OUT
T
IN
4
4
5kΩ
5kΩ
5kΩ
TTL/CMOS
OUTPUTS
RS-232
INPUTS
R3IN 11
OUT
R
OUT
3
11
T
IN
12
5
5
VCC
ONLINE 13
V
L
14
13
SHUTDOWN
ONLINE
SHUTDOWN 14
15
STATUS
16
Logic Level Select
VL
GND
2
Figure 2. SP3282EB Pinout Configuration
Figure 3. SP3282EB Application Diagram
VCC
+
+
26
CC
0.1µF
0.1µF
C5
C1
V
28
27
C1+
C1-
V+
+
C3
C4
0.1µF
0.1µF
25
1
C2+ SP3282EB
4
V-
+
C2
0.1µF
+
3
C2-
T1IN
T2IN
T
1OUT
5
24
23
T2OUT
T3OUT
T4OUT
6
T
3IN
T4IN
5IN
22
19
17
7
RS-232
OUTPUTS
TTL/CMOS
INPUTS
10
12
T
5OUT
T
R
1IN
R1OUT
R2OUT
R3OUT
21
20
18
8
5kΩ
5kΩ
5kΩ
TTL/CMOS
OUTPUTS
R2IN
R3IN
9
RS-232
INPUTS
11
V
CC
14
13
SHUTDOWN
ONLINE
16
Logic Level Select
VL
GND
2
Figure 4. Circuit for the connectivity of the SP3282EB with a DB-9 connector
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
5
DESCRIPTION
THEORY OF OPERATION
The SP3282EB device meets the EIA/TIA-232
and ITU-T V.28/V.24 communication protocols
and can be implemented in battery-powered, por-
table, or hand-held applications such as notebook
or palmtop computers. The SP3282EB device
features Sipex's proprietary and patented (U.S.
#5,306,954) on-board charge pump circuitry that
generates ±5.5V RS-232 voltage levels from a
single +3.3V to +5.5V power supply. The
SP3282EB will adhere to EIA/TIA-562 voltage
levels with VCC as low as 2.35V.
The SP3282EB device is made up of four basic
circuit blocks: 1. Drivers, 2. Receivers,
3. The Sipex proprietary charge pump, and
4. AUTO ON-LINE® circuitry.
Drivers
The drivers are inverting level transmitters that ,
when VCC is between +3.3V and +5.5V, convert
TTL or CMOS logic levels to 5.0V EIA/TIA-232
levels with an inverted sense relative to the input
logiclevels. Typically,theRS-232outputvoltage
swing is +5.4V with no load and +5V minimum
fully loaded. The driver outputs are protected
against infinite short-circuits to ground without
degradation in reliability. These drivers comply
with the EIA-TIA-232F and all previous RS-232
versions. The driver outputs will adhere to EIA/
TIA-562 when VCC is as low as 2.35V.
TheSP3282EBdeviceisanidealchoiceforpower
sensitive designs. The SP3282EB device features
AUTO ON-LINE® circuitry which reduces the
power supply drain to a 1µA supply current. In
many portable or hand-held applications, an RS-
232 cable can be disconnected or a connected
peripheral can be turned off. Under these condi-
tions,theinternalchargepumpandthedriverswill
be shut down. Otherwise, the system automati-
cally comes online. This feature allows design
engineers to address power saving concerns with-
out major design changes.
TheSP3282EBdriverscanguaranteeadatarateof
250 kbps fully loaded with 3kΩ in parallel with
1000pF, ensuring compatibility with PC-to-PC
communicationsoftware.Allunuseddriverinputs
must be connected to VL or GND.
Figure 6 shows a loopback test circuit used to test
theSP3282EBRS-232drivers. Figure7showsthe
test results of the loopback circuit with all five
drivers active at 120kbps with typical RS-232
loads in parallel with 1000pF capacitors. Figure 8
shows the test results where one driver was active
at 250kbps and all five drivers loaded with an RS-
232receiverinparallelwitha1000pFcapacitor. A
solid RS-232 data transmission rate of 120kbps
provides compatibility with many designs in per-
sonalcomputerperipheralsandLANapplications.
V
CC
+
+
26
0.1µF
0.1µF
C5
C1
V
CC
28
27
4
C1+
V+
+
+
C3
C4
0.1µF
0.1µF
25
1
C1-
C2+
SP3282EB
V-
+
C2
0.1µF
3
24
23
22
19
C2-
T
1OUT
T1IN
5
RxD
CTS
DSR
T2OUT
T3OUT
T4OUT
T2IN
6
T
3IN
7
RS-232
OUTPUTS
T4IN
10
12
DCD
RI
UART
or
Serial µC
T
5OUT
T
5IN
17
R1IN
R2IN
R3IN
R
1OUT
TxD
RTS
DTR
21
20
18
8
Receivers
5kΩ
5kΩ
5kΩ
R
2OUT
9
The receivers convert ±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels.
RS-232
INPUTS
R
3OUT
11
V
CC
14
13
SHUTDOWN
ONLINE
Receivers are not active when in shutdown. If
there is no activity present at the receivers for a
period longer than 100µs during AUTO ON-
LINE® mode or when SHUTDOWN is enabled,
the device goes into a standby mode where the
circuit draws 1µA. The truth table logic of the
driver and receiver outputs can be found in
Table 3.
16
V
L
15
STATUS
GND
2
µP
Supervisor
IC
V
IN
RESET
Figure 5. Interface Circuitry Being Controlled by
Microprocessor Supervisory Circuit
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
6
Sincereceiverinputisusuallyfromatransmission
line where long cable lengths and system
interference can degrade the signal, the inputs
have a typical hysteresis margin of 300mV. This
ensures that the receiver is virtually immune to
noisy transmission lines. Should an input be left
unconnected,aninternal5kΩpulldownresistorto
ground will commit the output of the receiver to a
HIGH state.
VCC
VCC
+
+
0.1µF
0.1µF
C5
C1
C1+
C1-
V+
V-
+
+
C3
C4
0.1µF
0.1µF
C2+ SP3282EB
+
Charge Pump
C2
0.1µF
C2-
The charge pump is a Sipex–patented design
(U.S. #5,306,954) and uses a unique approach
compared to older less–efficient designs. The
charge pump uses a four–phase voltage
shifting technique to attain symmetrical ±5.5V
power supplies. The internal power supply con-
sistsofaregulateddualchargepumpthatprovides
output voltages ±5.5V regardless of the input
voltage (VCC) over the +3.3V to +5.5V range.
This is important to maintain compliant RS-232
levels regardless of power supply
fluctuations. The charge pump will provide out-
putvoltagelevelsof±4.0Vwhentheinputvoltage
(VCC) is from +3.1V to +2.35V.
TxOUT
RxIN
TxIN
LOGIC
INPUTS
1000pF
RxOUT
LOGIC
OUTPUTS
5kΩ
VCC
ONLINE
SHUTDOWN
GND
Figure 6. Loopback Test Circuit for RS-232 Driver Data
Transmission Rates
The charge pump operates in a discontinuous
mode using an internal oscillator. If the output
voltages are less than a magnitude of 5.5V ( VCC
> 3.3V ) and 4.0V (VCC < 3.1V), the charge pump
is enabled. If the output voltages exceed a
magnitude of 5.5V (VCC > 3.3V) and 4.0V (VCC
<
3.1V), the charge pump is disabled. This oscilla-
tor controls the four phases of the voltage shifting
(Figure 10).
A description of each phase follows.
Phase 1 (Figure 11)
Figure 7. Loopback Test Circuit Result at 120kbps
(All Drivers Fully Loaded)
[
T
]
+6V
a) C2+
T
T
0V
0V
1
2
2
b) C2-
-6V
Ch1 2.00V Ch2 2.00V M 1.00µs Ch1 1.96V
Figure 8. Loopback Test Circuit result at 250kbps
(All Drivers Fully Loaded)
Figure 10. Charge Pump Waveforms
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
7
fromVCC,inano–loadconditionV+ andV– willbe
symmetrical. Older charge pump approaches that
generate V– from V+ will show a decrease in the
magnitude of V– compared to V+ due to the
inherent inefficiencies in the design.
— VSS charge storage — During this phase of the
clock cycle, the positive side of capacitors C1 and
C2areinitiallychargedtoVCC. Cl+isthenswitched
–
–
to GND and the charge in C1 is transferred to C2
+
. Since C2 is connected to VCC, the voltage poten-
tial across capacitor C2 is now 2 times VCC.
The clock rate for the charge pump typically
operatesat500kHz. Theexternalcapacitors should
be 0.22µF with a 16V working voltage rating for
a VCC input range of +2.35V to +5.5V.
Phase 2 (Figure 12)
— VSS transfer — Phase two of the clock
connects the negative terminal of C2 to the VSS
storagecapacitorandthepositiveterminalofC2 to
GND. This transfers a negative generated voltage
to C3. This generated voltage is
regulated to a minimum voltage of -5.5V (VCC
3.3V) and -4.0V (VCC < 3.1V).
>
Charge Pump Capacitor Selection
SimultaneouswiththetransferofthevoltagetoC3,
thepositivesideofcapacitorC1 isswitchedtoVCC
and the negative side is connected to GND.
The charge pump capacitors C1-C4 and bypass
C5 can be of any type including ceramic. If
polarized capacitors are used, refer to figure 3
application diagram for proper orientation. The
following chart illustrates the minimum capaci-
tor valve for a given input voltage range.
Phase 3 (Figure 13)
— VDD charge storage — The third phase of the
clock is identical to the first phase — the charge
transferred in C1 produces –VCC in the negative
terminalofC1,whichisappliedtothenegativeside
of capacitor C2. Since C2+ is at VCC, the voltage
potential across C2 is 2 times VCC.
VCC (V)
3.0 to 3.6
4.5 to 5.5
2.35 to 5.5
C1 and C5 (µF) C2,C3,C4 (µF)
0.1
0.047
0.22
0.1
0.33
0.22
Phase 4 (Figure 14)
— VDD transfer — The fourth phase of the clock
connects the negative terminal of C2 to GND, and
transfers this positive generated voltage across C2
to C4, the VDD storage capacitor. This voltage is
regulated to +5.5V (VCC > 3.3V) and +4.0V
(VCC<3.1V). Atthisvoltage,theinternaloscillator
is disabled. Simultaneous with the transfer of the
voltage to C4, the positive side of capacitor C1 is
switchedtoVCC andthenegativesideisconnected
to GND, allowing the charge pump cycle to begin
again. The charge pump cycle will continue as
long as the operational conditions for theinternal
oscillator are present.
Since both V+ and V– are separately generated
V
CC
+V
+
CC
C
4
+
-
V
V
Storage Capacitor
Storage Capacitor
DD
+
-
C
2
C
1
-
-
+
SS
C
3
-V
CC
-V
CC
Figure 11. Charge Pump — Phase 1
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
8
V
CC
C
4
+
-
V
V
Storage Capacitor
Storage Capacitor
DD
+
-
+
-
C
2
C
1
-
+
SS
C
3
-5.5V or -4.0V
Figure 12. Charge Pump — Phase 2
V
CC
+V
CC
C
4
+
-
V
Storage Capacitor
Storage Capacitor
DD
+
+
-
C
2
C
1
-
-
+
V
SS
C
3
-V
CC
-V
CC
Figure 13. Charge Pump — Phase 3
V
CC
+5.5V or +4.0V
+
C
4
+
-
V
V
Storage Capacitor
Storage Capacitor
DD
+
C
2
C
1
-
-
-
+
SS
C
3
Figure 14. Charge Pump — Phase 4
S
H
U
T
+2.7V
0V
-2.7V
R
INACT
RECEIVER
RS-232 INPUT
VOLTAGES
Inactive Detection Block
X
D
O
W
N
V
CC
0V
STATUS
RS-232
Receiver Block
R
IN
X
R OUT
X
t
STSL
t
STSH
t
ONLINE
+5V
DRIVER
RS-232 OUTPUT
VOLTAGES
0V
Figure 15. Stage I of AUTO ON-LINE® Circuitry
-5V
Figure 17. AUTO ON-LINE® Timing Waveforms
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
9
Delay
Stage
Delay
Stage
Delay
Stage
STATUS
R
1
INACT
R
INACT
R INACT
3
2
Figure 16. Stage II of AUTO ON-LINE® Circuitry
SHUTDOWN ONLINE
RS-232 SIGNAL AT
RECEIVER INPUT
STATUS
OUTPUT
TRANSCEIVER
STATUS
TXOUT RXOUT
INPUT
INPUT
Normal
Operation
HIGH
-
YES
NO
HIGH
Active
Active
Active
Active
Normal
Operation
HIGH
HIGH
HIGH
LOW
LOW
LOW
AUTO ON-LINE®
NO
High-Z Active
Mode
LOW
LOW
-
-
YES
NO
HIGH
LOW
High-Z High-Z
High-Z High-Z
Shutdown
Shutdown
Table 3. AUTO ON-LINE® Logic
AUTO ON-LINE® Circuitry
The SP3282EB device has a patent pending
AUTO ON-LINE® circuitry on board that saves
power in applications such as laptop computers,
palmtop (PDA) computers, and other portable
systems.
receiver input typically sees at least +3V, which
aregeneratedfromthetransmittersattheotherend
of the cable with a +5V minimum. When the
external transmitters are disabled or the cable is
disconnected, the receiver inputs will be pulled
down by their internal 5kΩ resistors to ground.
Whenthisoccursoveraperiodoftime,theinternal
transmitters will be disabled and the device goes
intoashutdownorstandbymode. WhenONLINE
isHIGH,theAUTO ON-LINE®modeisdisabled.
The SP3282EB device incorporates an
AUTO ON-LINE® circuit that automatically
enables itself when the external transmitters are
enabled and the cable is connected. Conversely,
the AUTO ON-LINE® circuit also disables most
of the internal circuitry when the device is not
beingusedandgoesintoastandbymodewherethe
device typically draws 1µA. This function is
controlled by the ONLINE pin. When this pin is
tied to a logic LOW, the AUTO ON-LINE® func-
tion is active. Once active, the device is enabled
untilthereisnoactivityonthereceiverinputs. The
The AUTO ON-LINE® circuit has two stages:
1) Inactive Detection
2) Accumulated Delay
The first stage, shown in Figure 15, detects an
inactive input. A logic HIGH is asserted on
RXINACT if the cable is disconnected or the
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
10
a) MIL-STD-883, Method 3015.7
b) IEC1000-4-2 Air-Discharge
c) IEC1000-4-2 Direct Contact
external transmitters are disabled. Otherwise,
RXINACT will be at a logic LOW. This circuit is
duplicated for each of the other receivers.
The Human Body Model has been the generally
acceptedESDtestingmethodforsemiconductors.
This method is also specified in MIL-STD-883,
Method 3015.7 for ESD testing. The premise of
this ESD test is to simulate the human body’s
potential to store electro-static energy and
dischargeittoanintegratedcircuit.Thesimulation
is performed by using a test model as shown in
Figure18. ThismethodwilltesttheIC’scapability
to withstand an ESD transient during normal
handlingsuchasinmanufacturingareaswherethe
ICs tend to be handled frequently.
The second stage of the AUTO ON-LINE® cir-
cuitry, shown in Figure 16, processes all the
receiver's RXINACT signals with an accumulated
delay that disables the device to a 1µA supply
current. The STATUS pin goes to a logic LOW
when the cable is disconnected, or when the exter-
nal transmitters are disabled.
When the drivers or internal charge pump are
disabled, the supply current is reduced to 1µA.
This can commonly occur in hand-held or
portable applications where the RS-232 cable is
disconnected or the RS-232 drivers of the
connected peripheral are turned off.
TheIEC-1000-4-2,formerlyIEC801-2,isgenerally
used for testing ESD on equipment and systems.
For system manufacturers, they must guarantee a
certainamountofESDprotectionsincethesystem
itself is exposed to the outside environment and
human presence. The premise with IEC1000-4-2
is that the system is required to withstand an
amountofstaticelectricitywhenESDisappliedto
points and surfaces of the equipment that are
accessible to personnel during
The AUTO ON-LINE® mode can be disabled by
the SHUTDOWN pin. If this pin is a logic LOW,
the AUTO ON-LINE® function will not operate
regardless of the logic state of the ONLINE pin.
Table 3 summarizes the logic of the AUTO ON-
LINE® operatingmodesandthetruthtablelogicof
the driver and receiver outputs.
normalusage. ThetransceiverICreceivesmostof
theESDcurrentwhentheESDsourceisappliedto
the connector pins. The test circuit for IEC1000-
4-2 is shown on Figure 19. There are two methods
within IEC1000-4-2, the Air Discharge method
and the Contact Discharge method.
When the SP3282EB device is shut down, the
chargepumpisturnedoff. V+chargepumpoutput
decays to VCC, the V- output decays to GND. The
decay time will depend on the size of capacitors
used for the charge pump. Once in shutdown, the
time required to exit the shut down state and have
valid V+ and V- levels is typically 200µs.
WiththeAirDischargeMethod,anESDvoltageis
appliedtotheequipmentundertest(EUT)through
air. This simulates an electrically charged person
readytoconnectacableontotherearofthesystem
only to find an unpleasant zap just before the
person touches the back panel. The high energy
potential on the person discharges through an
arcingpathtotherearpanelofthesystembeforehe
or she even touches the system. This energy,
whether discharged directly or through air, is
predominantly a function of the discharge current
rather than the discharge voltage. Variables with
an air discharge such as approach speed of the
object carrying the ESD potential to the system
and humidity will tend to change the discharge
current. Forexample,therisetimeofthedischarge
current varies with the approach speed.
For easy programming, the STATUS pin can be
used to indicate DTR or a Ring Indicator signal.
Tying ONLINE and SHUTDOWN together
willbypasstheAUTOON-LINE® circuitrysothis
connection acts like a shutdown input pin.
ESD TOLERANCE
The SP3282EB device incorporates ruggedized
ESD cells on all driver output and receiver input
pins. The ESD structure is improved over our
previous family for more rugged applications and
environmentssensitivetoelectro-staticdischarges
and associated transients. The improved ESD tol-
eranceisatleast+15kVwithoutdamagenorlatch-
up.
The Contact Discharge Method applies the ESD
current directly to the EUT. This method was
There are different methods of ESD testing ap-
plied:
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
11
devised to reduce the unpredictability of the ESD
arc. The discharge current rise time is constant
since the energy is directly transferred without the
air-gaparc. Insituationssuchashandheldsystems,
the ESD charge can be directly discharged to the
equipment from a person already holding the
equipment. The current is transferred on to the
keypadortheserialportoftheequipmentdirectlyand
then travels through the PCB and finally to the IC.
The higher C value and lower RS value in the
IEC1000-4-2 Smodel are more stringent than the
HumanBodyModel. Thelargerstoragecapacitor
injectsahighervoltagetothetestpointwhenSW2
is switched on. The lower current limiting resistor
increases the current charge onto the test point.
30A
15A
0A
The circuit model in Figures 18 and 19 represent
the typical ESD testing circuit used for all three
methods. The CS is initially charged with the DC
power supply when the first switch (SW1) is on.
Now that the capacitor is charged, the second
switch (SW2) is on while SW1 switches off. The
voltage stored in the capacitor is then applied
through RS, the current limiting resistor, onto the
device under test (DUT). In ESD tests, the SW2
switch is pulsed so that the device under test
receives a duration of voltage.
t=0ns
t=30ns
For the Human Body Model, the current limiting
resistor (RS) and the source capacitor (CS) are
1.5kΩan100pF, respectively. ForIEC-1000-4-2,
the current limiting resistor (RS) and the source
capacitor (CS) are 330Ω an 150pF, respectively.
t ■
Figure 20. ESD Test Waveform for IEC1000-4-2
R
R
S
S
R
R
C
C
SW2
SW2
SW1
SW1
Device
Under
Test
DC Power
Source
C
C
S
S
Figure 18. ESD Test Circuit for Human Body Model
CCoonnttaacctt--DDiisscchhaarrggee MMoodduullee
R
R
S
S
R
R
V
V
R
R
C
C
SW2
SW2
SW1
SW1
Device
Under
Test
DC Power
Source
C
C
S
S
R
R
and R add up to 330Ω for IEC1000-4-2.
and R add up to 330Ω for IEC1000-4-2.
S
S
V
V
Figure 19. ESD Test Circuit for IEC1000-4-2
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
12
DEVICE PIN
TESTED
HUMAN BODY
MODEL
IEC1000-4-2
Air Discharge Direct Contact
Level
Driver Outputs
Receiver Inputs
±15kV
±15kV
±15kV
±15kV
±8kV
±8kV
4
4
Table 4. Transceiver ESD Tolerance Levels
PACKAGE: 28 PIN TSSOP
D
e
Ø2
E
E1
Seaing Plane
L
Ø3
Ø1
L1
DETAIL A
1
2
INDEX AREA
D
2
E1
2
x
SEE DETAIL “A”
A2
A
Seating Plane
A1
b
B
B
28 Pin TSSOP JEDEC MO-153 (AE)
Variation
MIN
NOM
MAX
SYMBOL
A
A1
A2
b
c
D
-
-
-
1
-
-
1.2
0.05
0.8
0.19
0.09
9.6
0.15
1.05
0.3
0.2
9.8
b
9.7
e
E
E1
L
0.65 BSC
6.40 BSC
4.4
C
4.3
0.45
4.5
0.75
0.6
L1
Ø1
Ø2
Ø3
1.00 REF
-
12º REF
12º REF
Section B-B
0º
8º
Note: Dimensions in (mm)
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
13
PACKAGE: 28 PIN SSOP
D
N
SEE DETAIL “A”
E
E1
1
INDEX AREA
2
D
2
E1
x
2
2 NX R R1
A
A
Gauge Plane
Seaing Plane
L
Ø
L1
DETAIL A
28 Pin SSOP JEDEC MO-150 (AH) Variation
MIN
NOM
MAX
SYMBOL
A
A1
A2
b
c
D
E
E1
L
L1
ø
-
-
-
2
-
A2
A
0.05
1.65
0.22
0.09
9.9
7.4
5
Seating Plane
1.75
-
-
10.2
7.8
5.3
0.75
1.25 REF
4º
1.85
0.38
0.25
10.5
8.2
5.6
0.95
A1
b
0.55
WITH LEAD FINISH
0º
8º
Note: Dimensions in (mm)
c
BASE METAL
b
Section A-A
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
14
ORDERING INFORMATION
Model
Temperature Range
Package Types
SP3282EBCA ................................................. 0°C to +70°C ..................................................... 28-pin SSOP
SP3282EBCA/TR............................................ 0°C to +70°C ..................................................... 28-pin SSOP
SP3282EBCY .................................................. 0°C to +70°C ................................................... 28-pin TSSOP
SP3282EBCY/TR ............................................ 0°C to +70°C ................................................... 28-pin TSSOP
SP3282EBEA ................................................. 40°C to +85°C .................................................... 28-pin SSOP
SP3282EBEA/TR ........................................... 40°C to +85°C .................................................... 28-pin SSOP
SP3282EBEY ................................................. 40°C to +85°C .................................................. 28-pin TSSOP
SP3282EBEY/TR ........................................... 40°C to +85°C .................................................. 28-pin TSSOP
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SP3282EBEYTR = standard; SP3282EBEY-L/TR = lead free
/TR = Tape and Reel
Pack quantity is 1,500 for SSOP or TSSOP.
CLICK HERE TO ORDER SAMPLES
Corporation
ANALOGEXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
15
相关型号：
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