1
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
The SP334 is a programmable RS-232 and/or RS-485 transceiver IC. The SP334 contains
three drivers and ve receivers when selected in RS-232 mode; and two drivers and two
receivers when selected in RS-485 mode.
The RS-232 transceivers can typically operate at 230kbps while adhering to
the RS-232 specifications. The RS-485 transceivers can operate up to 10Mbps
while adhering to the RS-485 specications. The RS-485 drivers can be disabled
(High-Z output) by the TXEN enable pin. The RS-232 and RS-485 receiver outputs can be
disabled by the RXEN pin.
DESCRIPTION
• +5V Single Supply Operation
• Software Programmable RS-232 or RS-485
Selection
• Three RS-232 Drivers and Five Receivers
in RS-232 Mode
• Two RS-485 Full-Duplex Transceivers in
RS-485 Mode
• Full Differential Driver Tri-State (Hi-Z) Control
• Receiver Output Tri-State Control
SP334
Programmable RS-232/RS-485 Transceiver
TYPICAL APPLICATIONS CIRCUIT
TTL/CMOS
TTL/CMOS
TTL/CMOS
0.1µF
C1+
C1-
C2+
C2-
2
+5V
VCC
5
GND
8
9
11
12
13
19
26
27
1
TTL/CMOS
T1
T3
R1
RS-485
RS-485
RS-485
V+
V-
+5V
RS232/ RS485
RS-485
RS-485
RS-485
4
6
7
10
14
16
15
25
3
RI2
RI1
TX3
TX4
TX1
TX2
TI1
TI3
RX1
TTL/CMOS
21 R3
17
18RI4
RI3
RX3
RXEN
15KΩ
400KΩ
Vcc
400KΩ
Vcc
RS-485
RS-485
SP334
15KΩ
15KΩ
15KΩ
0.1µF
0.1µF
0.1µF
TXEN
TTL/CMOS
TI3
TXEN(n/c)
TX4(n/c)
TX3
VCC
TX1
TX2
GND
C1+
V+
C2+
C1–
C2–
V–
TI2
TI1
RXEN
RS232/RS485
RI5
RX5
RX4
RX3
RX2
RX1
RI4
RI3
RI2
RI1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SP334
(in RS-232 Mode)
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
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 specications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
VCC.......................................................................+7V
Input Voltages
Logic............................-0.5V to (Vcc+0.5V)
Drivers.........................-0.5V to (Vcc+0.5V)
Receivers......................+/-30V @ ≤100mA
Driver Outputs..................................................+/-15V
Maximum Data Rate...........................8Mbps (note 1)
SPECIFICATIONS
Limits are specied at TA = 25°C and VCC = +5.0V unless otherwise noted.
PARAMETER MIN. TYP. MAX. UNITS CONDITIONS
Logic Inputs
VIL 0.8 Volts
VIH 2.0 Volts
LOGIC OUTPUTS
VOL 0.4 Volts IOUT = -3.2mA
VOH 2.4 Volts IOUT = 1.0mA
Output Tri-state Leakage 10 µA 0.4V ≤ VOUT ≤ +2.4V
RS-232 DRIVER
DC Characteristics
HIGH Level Output +5.0 +15.0 Volts RL = 3kΩ, VIN = 0.8V
LOW Level Output -15.0 -5.0 Volts RL = 3kΩ, VIN = 2.0V
Open Circuit Voltage -15 +15 Volts
Short Circuit Current +/-100 mA VOUT = 0V
Power Off Impedance 300 ΩVCC = 0V, VOUT = +/-2.0V
AC Characteristics
Slew Rate 30 V/µs RL = 3kΩ, CL = 50pF; VCC = +5.0V,
TA @ 25°C
Transistion Time 1.56 µs RL = 3KΩ, CL = 2500pF;
between +/-3V, TA @ +25°C
Maximum Data Rate 120 235 kbps RL = 3kΩ, CL = 2500pF
Propagation Delay tPHL 2 8 µs Measured from 1.5V of VIN to 50%
of VOUT; RL = 3kΩ
Propagation Delay tPLH 2 8 µs
RS-232 RECEIVER
DC Characteristics
HIGH Threshold 1.7 3.0 Volts
LOW Threshold 0.8 1.2 Volts
Receiver Open Circuit Bias +2.0 Volts
Input Impedance 3 5 7 kΩ VIN = +15V to -15V
Storage Temperature.......................-65˚C to +150˚C
Power Dissipation
28-pin WSOIC...................................1000mW
Package Derating:
28-pin WSOIC
øJA................................................40 °C/W
Note 1: Exceeding the maximum data rate of 8Mbps at TA = 85°C may permanently damage the device
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
SPECIFICATIONS
Limits are specifed at TA = 25°C and VCC = +5.0V unless otherwise
PARAMETER MIN. TYP. MAX. UNITS CONDITIONS
RS-232 RECEIVER (continued)
AC Characteristics
Maximum Data Rate 120 235 kbps
Propagation Delay tPHL 0.25 1 µs Measured from 50% of VIN to 1.5V
of VOUT
Propagation Delay tPLH 0.25 1 µs
RS-485 DRIVER
DC Characteristics
Open circuit Voltage 6.0 Volts
Differential Output 1.5 5.0 Volts RL = 54Ω, CL = 50pF
Balance +/-0.2 Volts |VT| - |VT|
Common-Mode Output 3.0 Volts
Output Current 28.0 mA RL = 54Ω
Short Circuit Current +/-250 mA Terminated in -7V to +10V
AC Characteristics
Maximum Data Rate 10 Mbps RL = 54Ω
Maximum Data Rate 8 Mbps RL = 54Ω, TA = +85°C, Note 1
Output Transition Time 30 ns Rise/Fall time, 10%-90%
Propagation Delay tPHL 80 120 ns See Figures 3 & 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Propagation Delay tPLH 80 120 ns
Driver Output Skew 5 20 ns Per Figure 5, tSKEW = |tDPHL - tDPLH|
RS-485 RECEIVER
DC Characteristics
Common Mode Range -7.0 +12 Volts
Receiver Sensitivity +/-0.2 Volts -7V ≤ VCM ≤ +12V
Input Impedance 12 15 kΩ -7V ≤ VCM ≤ +12V
AC Characteristics
Maximum Data Rate 10 Mbps
Maximum Data Rate 8 Mbps TA = +85°C, Note 1
Propagation Delay tPHL 130 200 ns See Figures 3 & 7, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Propagation Delay tPLH 130 200 ns
Differential Receiver Skew 10 20 ns tSKEW = |tPHL - tPLH|, RDIFF = 54Ω,
CL1 = CL2 = 100pF, see Figure 8
ENABLE TIMING
RS-485 DRIVER
Enable Time (see Figures 4 and 6)
Enable to LOW 100 150 ns CL = 15pF, S1 Closed
Enable to HIGH 100 150 ns CL = 15pF, S2 Closed
Note 1: Exceeding the maximum data rate of 8Mbps at TA = 85°C may damage the device.
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
SPECIFICATIONS
Limits are specifed at TA = 25°C and VCC = +5.0V unless otherwise
PARAMETER MIN. TYP. MAX. UNITS CONDITIONS
RS-485 Driver Continued
Disable Time (see Figures 4 and 6)
Disable from LOW 100 120 ns CL = 15pF, S1 Closed
Disable from HIGH 100 120 ns CL = 15pF, S2 Closed
RS-485 RECEIVER
Enable Time (see Figures 2 and 8)
Enable to LOW 100 150 ns CL = 15pF, S1 Closed
Enable to HIGH 100 150 ns CL = 15pF, S2 Closed
Disable Time (see Figures 2 and 8)
Disable from LOW 100 120 ns CL = 15pF, S1 Closed
Disable from HIGH 100 120 ns CL = 15pF, S2 Closed
POWER REQUIREMENTS
Supply Voltage VCC +4.75 +5.25 Volts
Supply Current ICC
No Load (TX Disabled) 12 20 mA TXEN = 0V
No Load (RS-232 Mode) 20 50 mA RS232/RS485 = 0V
No Load (RS-485 Mode) 15 50 mA RS232/RS485 = +5V
ENVIRONMENTAL
Operating Temperature
Commercial (_C_) 0 70 ºC
Industrial (_E_) -40 +85 ºC
Storage Temperature -65 +150 ºC
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
RECEIVER INPUT GRAPH
RS-485 RECEIVER
+1.0mA
-0.6mA
+6V +12V
-3V-7V
Maximum Input Current
Versus Voltage
1 Unit Load
TEST CIRCUITS
A
B
R
R
V
OD
V
OC
Figure 1. Driver DC Test Load Circuit
CL1
15pF
RO
A
B
A
B
DI
CL2
RL
Figure 3. Driver/Receiver Timing Test Circuit
500Ω
CL
Output
Under
Test
S1
S2
VCC
Figure 4. Driver Timing Test Load #2 Circuit
Figure 2. Receiver Timing Test Load Circuit
1kΩ
1kΩCRL
Receiver
Output S1
S2
Test Point
VCC
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
Figure 5. Driver Propagation Delays
Figure 6. Driver Enable and Disable Times
Figure 7. Receiver Propagation Delays
+3V
0V
DRIVER INPUT
A
B
DRIVER
OUTPUT
VO+
DIFFERENTIAL
OUTPUT
VA – VB
0V
VO–
1.5V 1.5V
tPLH
tF
tR
f ≥ 1MHz; tR
≤ 10ns; tF ≤ 10ns
VO1/2V
O1/2V
O
tPHL
tSKEW
= |tDPLH
- tDPHL|
tDPLH tDPHL
+3V
0V
TXEN
5V
VOL
A, B
0V
1.5V 1.5V
tZL
tZH
f = 1MHz; tR
< 10ns; tF < 10ns
VOH
A, B 2.3V
2.3V
tLZ
tHZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
VOH
VOL
RECEIVER OUT 1.5V 1.5V
tPHL
f = 1MHz; tR 10ns ; t F
≤ 10ns
OUTPUT
VOD2+
VOD2–
A – B 0V 0V
tPLH
INPUT
≤
SWITCHING WAVEFORMS
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
Figure 9. Typical RS-232 Driver Output Figure 10. Typical RS-485 Driver Output
TTL
Input
Driver Output A
Driver Output B
Differential
Output
VA - VB
Figure 11. SP334 Pinout
TI3
TXEN(n/c)
TX4(n/c)
TX3
VCC
TX1
TX2
GND
C1+
V+
C2+
C1–
C2–
V–
TI2
TI1
RXEN
RS232/RS485
RI5
RX5
RX4
RX3
RX2
RX1
RI4
RI3
RI2
RI1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SP334
(in RS-232 Mode)
+3V
0V
5V
0V
1.5V 1.5V
tZL
tZH
f = 1MHz; tR≤ 10ns; tF ≤ 10ns
RECEIVER OUT 1.5V
1.5V
tLZ
tHZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
VIL
VIH
RECEIVER OUT
RXEN
tSKEW = | tPHL
- tPLH
|
Figure 8. Receiver Enable and Disable Times
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
+5V
GND
TTL/CMOS
TTL/CMOS
TTL/CMOS
0V
0.1µF
VCC
V+
V-
0V
RXEN
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
T1
T2
T3
TX1
TX2
TX3
TI1
TI2
TI3
RI1
RI2
RI3
RI4
RX1
RX2
RX3
RX4
1
7
5
6
8
10
C1+
C1-
C2+
C2-
9
11
12
13
14
15
16
17
18
19
20
21
22
RS232/RS485
25
26
27
28
R1
R2
R3
R4
5KΩ
Vcc
Vcc
Vcc
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
0V
SP334
0.1µF
0.1µF
0.1µF
400KΩ
400KΩ
400KΩ
5KΩ
5KΩ
5KΩ
TTL/CMOS
TTL/CMOS
TTL/CMOS
0.1µF
C1+
C1-
C2+
C2-
2
+5V
VCC
5
GND
8
9
11
12
13
19
26
27
1
TTL/CMOS
T1
T3
R1
RS-485
RS-485
RS-485
V+
V-
+5V
RS232/ RS485
RS-485
RS-485
RS-485
4
6
7
10
14
16
15
25
3
RI2
RI1
TX3
TX4
TX1
TX2
TI1
TI3
RX1
TTL/CMOS
21 R3
17
18RI4
RI3
RX3
RXEN
15KΩ
400KΩ
Vcc
400KΩ
Vcc
RS-485
RS-485
SP334
15KΩ
15KΩ
15KΩ
0.1µF
0.1µF
0.1µF
TXEN
TTL/CMOS
3
2
4
N/C
N/C
R5
5KΩ
RI5 24 RS-232
RX5
23
TTL/CMOS
RS-232 MODE
RS-485 MDDE
Figure 12. Typical Operating Circuit
THEORY OF OPERATION
The SP334 is made up of four separate
circuit blocks — the charge pump, drivers,
receivers, and decoder. Each of these circuit
blocks is described in more detail below.
Charge–Pump
The charge pump is a Exar–patented design
(U.S. 5,306,954) and uses a unique approach
compared to older less efcient designs.
The charge pump still requires four external
capacitors, but uses a four–phase voltage
shifting technique to attain symmetrical 10V
power supplies. Figure 17(a) shows the
waveform found on the positive side of
capacitor C2, and Figure 17(b) shows the
negative side of capacitor C2. There is a
free–running oscillator that controls the four
phases of the voltage shifting. A description
of each phase follows.
Phase 1
— VSS charge storage —During this phase of
the clock cycle, the positive side of capacitors
C1 and C2 are initially charged to +5V. C1
+ is
then switched to ground and charge on
C1
– is transferred to C2
–. Since C2
+ is con-
nected to +5V, the voltage potential across
capacitor C2 is now 10V.
Phase 2
— VSS transfer — Phase two of the clock con-
nects the negative terminal of C2 to the VSS
storage capacitor and the positive terminal
of C2 to ground, and transfers the generated
–l0V to C3. Simultaneously, the positive side
of capacitor C 1 is switched to +5V and the
negative side is connected to ground.
Phase 3
— VDD charge storage — The third phase
of the clock is identical to the rst phase
— the charge transferred in C1 produces
–5V in the negative terminal of C1, which
is applied to the negative side of capacitor
C2. Since C2
+ is at +5V, the voltage potential
across C2 is l0V.
Phase 4
— VDD transfer — The fourth phase of the
clock connects the negative terminal of C2
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
to ground and transfers the generated l0V
across C2 to C4, the VDD storage capacitor.
Again, simultaneously with this, the positive
side of capacitor C1 is switched to +5V and
the negative side is connected to ground,
and the cycle begins again.
Since both V+ and V– are separately gen-
erated from VCC in a no–load condition, V+
and V– will be 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
inefciencies in the design.
The clock rate for the charge pump typically
operates at 15kHz. The external capacitors
must be a minimum of 0.1µF with a 16V
breakdown rating.
External Power Supplies
For applications that do not require +5V only,
external supplies can be applied at the V+
and V– pins. The value of the external sup-
ply voltages must be no greater than ±l0V.
The current drain for the ±10V supplies is
used for RS-232. For the RS-232 driver the
current requirement will be 3.5mA per driver.
The external power supplies should provide
a power supply sequence of :+l0V, then +5V,
followed by –l0V.
V
CC
= +5V
–5V –5V
+5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+ +
–
–
––
VCC = +5V
–10V
VSS Storage Capacitor
VDD Storage Capacitor
C1C2
C3
C4
+
+
+ +
–
–
––
V
CC
= +5V
–5V
+5V
–5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+ +
–
–
––
V
CC
= +5V
+10V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+ +
–
–
––
Figure 13. Charge Pump Phase 1.
Figure 14. Charge Pump Phase 2.
Figure 15. Charge Pump Phase 3.
Figure 16. Charge Pump Phase 4.
+10V
GND
GND
-10V
a) C2+
b) C2-
Figure 17. Charge Pump Waveforms
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
Drivers
The SP334 has three independent RS-232
single-ended drivers and two differential RS-
485 drivers. Control for the mode selection
is done by the RS232/RS485 select pin. The
drivers are pre-arranged such that for each
mode of operation the relative position and
functionality of the drivers are set up to ac-
commodate the selected interface mode. As
the mode of the drivers is changed, the elec-
trical characteristics will change to support
the requirements of clock, data, and control
line signal levels. Unused driver inputs can
be left oating; however, to ensure a desired
state with no input signal, pull–up resistors
to +5V or pull–down resistors to ground are
suggested. Since the driver inputs are both
TTL or CMOS compatible, any value resistor
less than 100kΩ will sufce.
When in RS-232 mode, the single-ended
RS-232 drivers produce compliant RS-232E
and ITU V.28 signals. Each of the three
drivers output single-ended bipolar signals
in access of ±5V with a full load of 3kΩ and
2500pF applied as specied. These drivers
can also operate at least 120kbps.
When programmed to RS-485 mode, the
differential RS-485 drivers produce complaint
RS-485 signals. Each RS-485 driver outputs
a unipolar signal on each output pin with a
magnitude of at least 1.5V while loaded with
a worst case of 54Ω between the driver's
two output pins. The signal levels and drive
capability of the RS-485 drivers allow the
drivers to also comply with RS-422 levels.
The transmission rate for the differential
drivers is 10Mbps.
Receivers
The SP334 has ve single-ended receivers
when programmed for RS-232 mode and two
differential receivers when programmed for
RS-485 mode.
Control for the mode selection is done by
the same select pin as the drivers. As the
operating mode of the receivers is changed,
the electrical characteristics will change to
support the requirements of the appropriate
serial standard. Unused receiver inputs can
be left oating without causing oscillation. To
ensure a desired state of the receiver
output, a pull–up resistor of 100kΩ to +5V
should be connected to the inverting input
for a logic low, or the non–inverting input
for a logic high. For single-ended receiv-
ers, a pull–down resistor to ground of 5kΩ
is internally connected, which will ensure a
logic high output.
The RS-232 receiver has a single–ended
input with a threshold of 0.8V to 2.4V. The
RS-232 receiver has an operating voltage
range of ±15V and can receive signals up
to 120kbps. RS-232 receivers are used in
RS-232 mode for all signal types include
data, clock, and control lines of the RS-232
serial port.
The differential RS-485 receiver has an input
impedance of 15kΩ and a differential thresh-
old of ±200mV. Since the characteristics of
an RS-422 receiver are actually subsets of
RS-485, the receivers for RS-422 require-
ments are identical to the RS-485 receivers.
All of the differential receivers can receive
data up to 10Mbps.
Enable Pins
The SP334 drivers can be enabled by use
of the TXEN pin. A logic HIGH will enable
the driver outputs and a logic LOW will tri-
state the outputs. The drivers can only be
tri-stated in RS-485 mode. The drivers are
always active in RS-232 mode.
The Receiver outputs can also be tri-stated
by the use of the RXEN pin. A logic LOW
will enable the receiver outputs and a logic
HIGH will tri-state the outputs. . The receiver
tri-state capability is offered for both RS-232
and RS-485 modes. The input impedance
of the receivers during tri-state is at least
12kΩ.
Applications
The SP334 allows the user exibility in hav-
ing a RS-232 or RS-485 serial port without
using two different discrete active IC's. Figure
18 shows a connection to a standard DB-9
RS-232 connector. In RS-485 mode, the
SP334 is a full duplex transceiver, however,
a half duplex conguration can be made by
connecting the driver outputs to receiver
inputs.
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
+5V
GND
DCD
TxD
DSR
0V
0.1µF
VCC
V+
V-
RXEN
RTS
DTR
CTS
RxD
T1
T2
T3
TX1
TX2
TX3
TI1
TI2
TI3
RI1
RI2
RI3
RI4
RX1
RX2
RX3
RX4
1
7
5
6
8
10
C1+
C1-
C2+
C2-
9
11
12
13
14
15
16
17
18
19
20
21
22
RS232/RS485
25
26
27
28
R1
R2
R3
R4
5KΩ
Vcc
Vcc
Vcc
0V
SP334
0.1µF
0.1µF
0.1µF
400KΩ
400KΩ
400KΩ
5KΩ
5KΩ
5KΩ
4
R5
5KΩ
RI5 24RX5
23
RI
1
5
6
9
DCD
DSR
RxD
RTS
TxD
CTS
DTR
RI
SG
0V
Figure 18. SP334 Conguration to a DB-9 Serial Port
12
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13
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP334_100_090909
ORDERING INFORMATION
Model Temperature Range Package Types
SP334CT-L .......................................................................... 0°C to +70°C .............................................................................................28-pin WSOIC
SP334CT-L/TR .................................................................... 0°C to +70°C .............................................................................................28-pin WSOIC
SP334ET-L....................................................................... -40°C to +85°C.............................................................................................28-pin WSOIC
SP334ET-L/TR................................................................. -40°C to +85°C.............................................................................................28-pin WSOIC
REVISION HISTORY
DATE REVISION DESCRIPTION
2000 SP334/10 Legacy Sipex Datasheet
09/09/09 1.0.0 Convert to Exar Format. Add typical application circuit to page 1 and Revision
History table. Remove EOL part numbers and update ordering information per
PDN 081126-01. Change revision to 1.0.0. Add Maximum Data Rate to Absolute
Maximum Ratings. Add RS-485 Driver and Receiver data rate column for 8Mbps
maximum at Tmax and add Note 1.
Notice
EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil-
ity. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for
illustration purposes and may vary depending upon a user's specic application. While the information in this publication has been carefully checked;
no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can
reasonably be expected to cause failure of the life support system or to signicantly affect its safety or effectiveness. Products are not authorized for
use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been
minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Copyright 2009 EXAR Corporation
Datasheet August 2009
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