SIPEX SP3243EHCT

®
SP3223EH/3243EH
High Speed Intelligent +3.0V to +5.5V
RS-232 Transceivers
■ Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
■ Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
■ Auto-Online™ circuitry automatically
wakes up from a 1µA shutdown
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
■ Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
■ 460 Kbps minimum transmission rate
■ Ideal for High Speed RS-232 Applications
DESCRIPTION
The SP3223EH and 3243EH products are RS-232 transceiver solutions intended for portable
or hand-held applications such as notebook and palmtop computers. The "H" series is based
on Sipex's SP3223E/3243E series and has been enhanced for high speed. The data rate is
improved to 460Kbps, easily meeting the demands of high speed RS-232 applications. The
SP3223EH and 3243EH use 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 SP3223EH/3243EH series to deliver compliant RS-232 performance from
a single power supply ranging from +3.3V to +5.0V. The SP3223EH is a 2-driver/2-receiver
device, and the SP3243EH is a 3-driver/5-receiver device, ideal for laptop/notebook computer
and PDA applications. The SP3243EH includes one complementary receiver that remains
alert to monitor an external device's Ring Indicate signal while the device is shutdown.
The Auto-Online 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.
SELECTION TABLE
Device
Power Supplies
RS-232
Drivers
RS-232
Receivers
External
Components
Auto-Online
Circuitry
TTL 3-State
No. of
Pins
SP3223EH
+3.0V to +5.5V
2
2
4 capacitors
YES
YES
20
SP3243EH
+3.0V to +5.5V
3
5
4 capacitors
YES
YES
28
Applicable U.S. Patents - 5,306,954; and other patents pending.
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
1
© Copyright 2000 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
Power Dissipation per package
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.
VCC.......................................................-0.3V to +6.0V
V+ (NOTE 1).......................................-0.3V to +7.0V
V- (NOTE 1)........................................+0.3V to -7.0V
V+ + |V-| (NOTE 1)...........................................+13V
ICC (DC VCC or GND current).........................+100mA
Input Voltages
TxIN, ONLINE,
SHUTDOWN, EN (SP3223EH).................-0.3V to +6.0V
RxIN...................................................................+15V
Output Voltages
TxOUT...............................................................+15V
RxOUT, STATUS.......................-0.3V to (VCC + 0.3V)
Short-Circuit Duration
TxOUT.....................................................Continuous
Storage Temperature......................-65°C to +150°C
20-pin PDIP (derate 16.0mW/oC above+70oC).....1300mW
20-pin SSOP (derate 9.25mW/oC above +70oC)....750mW
20-pin TSSOP (derate 11.1mW/oC above +70oC)..900mW
28-pin SOIC (derate 12.7mW/oC above +70oC)....1000mW
28-pin SSOP (derate 11.2mW/oC above +70oC).....900mW
NOTE 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
SPECIFICATIONS
Unless otherwise noted, the following specifications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX.
Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C.
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
Supply Current, Auto-Online
1.0
10
µA
All RxIN open, ONLINE = GND,
SHUTDOWN = VCC,
VCC = +3.3V, TAMB = +25° C
Supply Current, Shutdown
1.0
10
µA
SHUTDOWN = GND,
VCC = +3.3V, TAMB = +25° C
Supply Current, Auto-Online
Disabled
0.3
1.0
mA
ONLINE = SHUTDOWN = VCC,
no load, VCC = +3.3V, TAMB = +25° C
0.8
V
DC CHARACTERISTICS
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold
LOW
HIGH
2.0
VCC = +3.3V or +5.0V, TxIN,
EN (SP3223EH), ONLINE,
SHUTDOWN
Input Leakage Current
+0.01
+1.0
µA
TxIN, EN, ONLINE, SHUTDOWN,
TAMB = +25° C
Output Leakage Current
+0.05
+10
µA
Receivers disabled
0.4
V
IOUT = 1.6mA
V
IOUT = -1.0mA
Output Voltage LOW
Output Voltage HIGH
SP3223EHDS/11
VCC - 0.6
VCC - 0.1
SP3223EH +3.0V to +5.5V RS-232 Transceivers
2
© Copyright 2000 Sipex Corporation
SPECIFICATIONS (continued)
Unless otherwise noted, the following specifications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX.
Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C.
PARAMETER
MIN.
TYP.
Output Voltage Swing
+5.0
+5.4
Output Resistance
300
MAX.
UNITS
CONDITIONS
DRIVER OUTPUTS
+35
+70
Output Short-Circuit Current
Output Leakage Current
V
All driver outputs loaded with 3KΩ
to GND, TAMB = +25° C
Ω
VCC = V+ = V- = 0V, VOUT = ±2V
+60
+100
mA
±25
µA
15
V
VOUT = 0V
VOUT = ±15V
VCC = 0V or 3.0V to 5.5V,
VOUT = +12V, Drivers disabled
RECEIVER INPUTS
Input Voltage Range
-15
Input Threshold LOW
0.6
1.2
V
VCC = 3.3V
Input Threshold LOW
0.8
1.5
V
VCC = 5.0V
Input Threshold HIGH
1.5
2.4
V
VCC = 3.3V
Input Threshold HIGH
1.8
2.4
V
VCC = 5.0V
Input Hysteresis
0.3
Input Resistance
3
V
5
7
kΩ
Auto-Online CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = VCC)
STATUS Output Voltage LOW
STATUS Output Voltage HIGH
0.4
VCC - 0.6
V
IOUT = 1.6mA
V
IOUT = -1.0mA
Receiver Threshold to Drivers
Enabled (tONLINE)
200
µS
Figure 15
Receiver Positive or Negative
Threshold to STATUS HIGH
(tSTSH)
0.5
µS
Figure 15
Receiver Positive or Negative
Threshold to STATUS LOW
(tSTSL)
20
µS
Figure 15
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
3
© Copyright 2000 Sipex Corporation
SPECIFICATIONS (continued)
Unless otherwise noted, the following specifications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX.
Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C.
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
TIMING CHARACTERISTICS
Maximum Data Rate
460
RL = 3KΩ, CL = 1000pF, one driver active
Kbps
Receiver Propagation Delay
tPHL
tPLH
0.3
0.3
µs
Receiver input to Receiver output, CL = 150pF
Receiver Output Enable Time
200
ns
Normal operation
Receiver Output Disable Time
200
ns
Normal operation
Driver Skew
50
100
ns
| tPHL - tPLH |
Receiver Skew
200
1000
ns
| tPHL - tPLH |
Transition-Region Slew Rate
60
VCC= 3.3V, RL = 3KΩ, TAMB = 25oC,
measurements taken from -3.0V to +3.0V or
+3.0V to -3.0V
V/µs
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 235Kbps data rate, all drivers
loaded with 3kΩ, 0.1µF charge pump capacitors, and TAMB = +25°C.
14
12
4
10
Slew Rate [V/µs]
Transmitter Output Voltage [V]
6
Vout+
Vout-
2
0
0
500
1000
1500
-2
6
+Slew
-Slew
4
-4
2
-6
0
Load Capacitance [pF]
0
500
1000
1500
Load Capacitance [pF]
2000
Figure 2. Slew Rate VS. Load Capacitance for the
SP3223EH
Figure 1. Transmitter Output Voltage VS. Load
Capacitance for the SP3223EH
SP3223EHDS/11
8
SP3223EH +3.0V to +5.5V RS-232 Transceivers
4
© Copyright 2000 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 235Kbps data rate, all drivers
loaded with 3kΩ, 0.1µF charge pump capacitors, and TAMB = +25°C.
40
118KHz
60KHz
10KHz
6
Transmitter Output Voltage [V]
Supply Current [mA]
35
30
25
20
15
10
4
Vout+
Vout-
2
0
0
500
1000
2000
1500
2500
-2
-4
5
-6
Load Capacitance [pF]
0
0
500
1000
1500
Load Capacitance [pF]
2000
Figure 4. Transmitter Output Voltage VS. Load
Capacitance for the SP3243EH
16
80
14
70
12
60
Supply Current [mA]
Slew Rate [V/µs]
Figure 3. Supply Current VS. Load Capacitance when
Transmitting Data for the SP3223EH
10
8
6
+ Slew
- Slew
4
118KHz
60KHz
10KHz
50
40
30
20
10
2
0
0
0
500
1000
1500
2000
2500
0
3000
500
1500
2000
2500
3000
Figure 6. Supply Current VS. Load Capacitance when
Transmitting Data for the SP3243EH
Figure 5. Slew Rate VS. Load Capacitance for the
SP3243EH
SP3223EHDS/11
1000
Load Capacitance [pF]
Load Capacitance [pF]
SP3223EH +3.0V to +5.5V RS-232 Transceivers
5
© Copyright 2000 Sipex Corporation
PIN NUMBER
NAME
FUNCTION
SP3223EH SP3243EH
EN
Receiver Enable. Apply logic LOW for normal operation. Apply logic HIGH
to disable the receiver outputs (high-Z state).
1
-
C1+
Positive terminal of the voltage doubler charge-pump capacitor.
2
28
V+
Regulated +5.5V output generated by the charge pump.
3
27
C1-
Negative terminal of the voltage doubler charge-pump capacitor.
4
24
C2+
Positive terminal of the inverting charge-pump capacitor.
5
1
C2-
Negative terminal of the inverting charge-pump capacitor.
6
2
Regulated -5.5V output generated by the charge pump.
7
3
R1IN
RS-232 receiver input.
16
4
R2IN
RS-232 receiver input.
9
5
R3IN
RS-232 receiver input.
-
6
R4IN
RS-232 receiver input.
-
7
R5IN
RS-232 receiver input.
-
8
V-
R1OUT
TTL/CMOS receiver output.
15
19
R2OUT
TTL/CMOS receiver output.
10
18
R2OUT
Non-inverting receiver-2 output, active in shutdown.
-
20
R3OUT
TTL/CMOS receiver output.
-
17
R4OUT
TTL/CMOS receiver output.
-
16
R5OUT
TTL/CMOS receiver output.
-
15
TTL/CMOS Output indicating online and shutdown status.
11
21
T1IN
TTL/CMOS driver input.
13
14
T2IN
TTL/CMOS driver input.
12
13
T3IN
TTL/CMOS driver input.
-
12
Apply logic HIGH to override Auto-Online circuitry keeping drivers active
(SHUTDOWN must also be logic HIGH, refer to Table 2).
14
23
T1OUT
RS-232 driver output.
17
9
T2OUT
RS-232 driver output.
8
10
T3OUT
RS-232 driver output.
-
11
Ground.
18
25
+3.0V to +5.5V supply voltage.
19
26
Apply logic LOW to shut down drivers and charge pump. This overrides all
Auto-Online circuitry and ONLINE (refer to Table 2).
20
22
STATUS
ONLINE
GND
VCC
SHUTDOWN
Table 1. Device Pin Description
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
6
© Copyright 2000 Sipex Corporation
EN
20 SHUTDOWN
1
C1+ 2
19 VCC
V+
3
18 GND
C1-
4
17
C2+
5
SP3223EH 16
C2-
6
15 R1OUT
V-
7
14
T2OUT
8
13 T1IN
R2IN
9
12 T2IN
R2OUT 10
11
T1OUT
R1IN
ONLINE
STATUS
Figure 7. SP3223EH Pinout Configuration
C2+ 1
28 C1+
C2- 2
27
V+
V-
3
26
VCC
R1IN
4
25
GND
R2IN
5
24
C1-
R3IN
6
R4IN
7
SP3243EH 23 ONLINE
22 SHUTDOWN
21 STATUS
R5IN 8
T1OUT 9
20
R2OUT
T2OUT 10
19
R1OUT
T3OUT 11
18
R2OUT
T3IN 12
17
R3OUT
T2IN 13
16
R4OUT
T1IN 14
15
R5OUT
Figure 8. SP3243EH Pinout Configuration
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
7
© Copyright 2000 Sipex Corporation
+3V to +5V
C5
C1
+
+
19
VCC
0.1µF
2 C1+
V+
3
0.1µF
C3
+
0.1µF
4 C15 C2+
C2
+
0.1µF
TTL/CMOS
INPUTS
SP3223EH
V-
7
C4
6 C213 T1IN
T1OUT 17
12 T2IN
T2OUT
R1IN
15 R1OUT
8
RS-232
OUTPUTS
RS-232
INPUTS
R2IN
10 R2OUT
0.1µF
16
5KΩ
TTL/CMOS
OUTPUTS
+
9
5KΩ
1
VCC
20
14
To µP Supervisor
Circuit
11
EN
SHUTDOWN
ONLINE
STATUS
GND
18
Figure 9. SP3223EH Typical Operating Circuit
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
8
© Copyright 2000 Sipex Corporation
C5
C1
+
+
VCC
26
VCC
0.1µF
28 C1+
0.1µF
C2
0.1µF
TTL/CMOS
INPUTS
27
C3
+
24 C11 C2+
+
V+
SP3243EH
V-
0.1µF
3
C4
2 C214 T1IN
T1OUT
13 T2IN
T2OUT 10
12 T3IN
T3OUT 11
+
0.1µF
9
RS-232
OUTPUTS
20 R2OUT
19 R1OUT
R1IN
4
R2IN
5
R3IN
6
R4IN
7
R5IN
8
5KΩ
18 R2OUT
5KΩ
TTL/CMOS
OUTPUTS
17 R3OUT
5KΩ
16 R4OUT
RS-232
INPUTS
5KΩ
15
VCC
22
23
To µP Supervisor
Circuit
R5OUT
5KΩ
SHUTDOWN
ONLINE
21 STATUS
GND
25
Figure 10. SP3243EH Typical Operating Circuit
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
9
© Copyright 2000 Sipex Corporation
DESCRIPTION
The SP3223EH and SP3243EH transceivers
meet the EIA/TIA-232 and ITU-T V.28/V.24
communication protocols and can be
implemented in battery-powered, portable, or
hand-held applications such as notebook or
palmtop computers. The SP3223EH and
SP3243EH devices feature 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 +3.0V to +5.5V
power supply. The SP3223EH and SP3243EH
devices can operate at a data rate of 460Kbps
fully loaded.
The SP3223EH and SP3243EH series is an
ideal choice for power sensitive designs. The
SP3223EH and SP3243EH devices feature
Auto-Online 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 conditions,
the internal charge pump and the drivers will be
shut down. Otherwise, the system automatically
comes online. This feature allows design
engineers to address power saving concerns
without major design changes.
The SP3223EH is a 2-driver/2-receiver device,
and the SP3243EH is a 3-driver/5-receiver device,
ideal for portable or hand-held applications. The
SP3243EH includes one complementary
always-active receiver that can monitor an
external device (such as a modem) in shutdown.
This aids in protecting the UART or serial
controller IC by preventing forward biasing
of the protection diodes where VCC may be
disconnected.
THEORY OF OPERATION
The SP3223EH and SP3243EH series is made
up of four basic circuit blocks: 1. Drivers,
2. Receivers, 3. the Sipex proprietary charge
pump, and 4. Auto-Online circuitry.
Drivers
The drivers are inverting level transmitters that
convert TTL or CMOS logic levels to 5.0V EIA/
TIA-232 levels with an inverted sense relative to
the input logic levels. Typically, the RS-232
output voltage 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-232-F and all
previous RS-232 versions.
VCC
+
C5
+
C1
26
VCC
0.1µF
28 C1+
V+
27
0.1µF
C3
+
0.1µF
24 C11 C2+
SP3243EH
V-
3
14 T1IN
T1OUT
9
RTS
13 T2IN
T2OUT 10
DTR
12 T3IN
T3OUT 11
C2
+
0.1µF
TxD
C4
2 C2-
+
0.1µF
RS-232
OUTPUTS
The drivers can guarantee a data rate over
460Kbps fully loaded with 3KΩ in parallel with
1000pF, ensuring compatibility with PC-to-PC
communication software.
20 R2OUT
UART
or
Serial µC
RxD
19 R1OUT
CTS
18 R2OUT
DSR
17 R3OUT
DCD
16 R4OUT
RI
15 R5OUT
R1IN 4
5KΩ
R2IN
5
5KΩ
R3IN
6
R4IN
7
R5IN
8
5KΩ
RS-232
INPUTS
5KΩ
VCC
22
23
The slew rate of the driver output is internally
limited to a maximum of 30V/µs in order to
meet the EIA standards (EIA RS-232D 2.1.7,
Paragraph 5). The transition of the loaded
output from HIGH to LOW also meets the
monotonicity requirements of the standard.
5KΩ
SHUTDOWN
ONLINE
21 STATUS
GND
25
RESET
µP
Supervisor
IC
VIN
Figure 11. Interface Circuitry Controlled by Microprocessor Supervisory Circuit
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
10
© Copyright 2000 Sipex Corporation
DEVICE: SP3223EH
SHUTDOWN
EN
+3V to +5V
TXOUT
RXOUT
C5
C1
0
0
High Z
1
High Z
+
19
VCC
0.1µF
2 C1+
5 C2+
+
0.1µF
Active
Active
1
1
Active
High Z
SP3223EH
SP3243EH
V-
C4
T1IN
T1OUT
TXIN
TXOUT
R2OUT
0
High Z
High Z
Active
1
Active
Active
Active
0.1µF
5KΩ
RXIN
20
14
To µP Supervisor
Circuit
5KΩ
1 EN
VCC
RXOUT
+
R1IN
R1OUT
TTL/CMOS
OUTPUTS
RXOUT
TXOUT
0.1µF
TTL/CMOS
INPUTS
DEVICE: SP3243EH
SHUTDOWN
+
7
6 C2-
High Z
0
3
C3
Active
1
V+
0.1µF
4 C1-
C2
0
+
11
1000pF
1000pF
SHUTDOWN
ONLINE
STATUS
GND
18
Figure 12. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
Table 2. SHUTDOWN and EN Truth Tables
Note: In Auto-Online Mode where ONLINE = GND and
SHUTDOWN = VCC, the device will shut down if there is
no activity present at the Receiver inputs.
with an RS-232 receiver in parallel with a 1000pF
capacitor. A superior RS-232 data transmission
rate of 1Mbps makes the SP3223EH/3243EH
series an ideal match for high speed LAN and
personal computer peripheral applications.
The SP3223EH and SP3243EH drivers can
maintain high data rates over 460Kbps fully
loaded. Figure 12 shows a loopback test circuit
used to test the RS-232 Drivers. Figure 13 shows
the test results of the loopback circuit with all
three drivers active at 120Kbps with typical
RS-232 loads in parallel with 1000pF capacitors.
Figure 14 shows the test results where one driver
was active at 1Mbps and all three drivers loaded
Receivers
The receivers convert +5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels. All
receivers have an inverting output that can be
disabled by using the EN pin.
Figure 13. Loopback Test Circuit 1 Driver Fully Loaded
SP3223EHDS/11
Figure 14. Loopback Test Circuit
(All Drivers Fully Loaded)
SP3223EH +3.0V to +5.5V RS-232 Transceivers
11
© Copyright 2000 Sipex Corporation
The charge pump operates in a discontinuous
mode using an internal oscillator. If the output
voltages are less than a magnitude of 5.5V, the
charge pump is enabled. If the output voltages
exceed a magnitude of 5.5V, the charge pump is
disabled. This oscillator controls the four phases
of the voltage shifting. A description of each
phase follows.
Receivers are active when the Auto-Online
circuitry is enabled or when in shutdown.
During the shutdown, the receivers will continue
to be active. If there is no activity present at the
receivers for a period longer than 100µs or when
SHUTDOWN is enabled, the device goes into a
standby mode where the circuit draws 1µA.
Driving EN to a logic HIGH forces the outputs of
the receivers into high-impedance. The truth
table logic of the SP3223EH and SP3243EH
driver and receiver outputs can be found in Table 2.
Phase 1
— VSS charge storage — During this phase of
the clock cycle, the positive side of capacitors
C1 and C2 are initially charged to VCC. Cl+ is
then switched to GND and the charge in C1– is
transferred to C2–. Since C2+ is connected to
VCC, the voltage potential across capacitor C2 is
now 2 times VCC.
The SP3243EH includes an additional noninverting receiver with an output R2OUT. R2OUT
is an extra output that remains active and
monitors activity while the other receiver
outputs are forced into high impedance.
This allows Ring Indicator (RI) from a
peripheral to be monitored without forward
biasing the TTL/CMOS inputs of the other
devices connected to the receiver outputs.
Phase 2
— VSS transfer — Phase two of the clock
connects the negative terminal of C2 to the VSS
storage capacitor and the positive terminal of C2
to GND. This transfers a negative generated
voltage to C 3 . This generated voltage is
regulated to a minimum voltage of -5.5V.
Simultaneous with the transfer of the voltage to
C3, the positive side of capacitor C1 is switched
to VCC and the negative side is connected to
GND.
Since receiver input is usually from a transmission 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, an internal 5KΩ pulldown resistor
to ground will commit the output of the receiver
to a HIGH state.
Phase 3
— 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
terminal of C1, which is applied to the negative
side of capacitor C2. Since C2+ is at VCC, the
voltage potential across C2 is 2 times VCC.
Charge Pump
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 still requires four external
capacitors, but uses a four–phase voltage
shifting technique to attain symmetrical 5.5V
power supplies. The internal power supply
consists of a regulated dual charge pump that
provides output voltages 5.5V regardless of the
input voltage (VCC) over the +3.0V to +5.5V
range. This is important to maintain compliant
RS-232 levels regardless of power supply
fluctuations.
SP3223EHDS/11
Phase 4
— 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. At this voltage,
the internal oscillator is disabled. Simultaneous
with the transfer of the voltage to C4, the
positive side of capacitor C1 is switched to VCC
and the negative side is connected to GND,
allowing the charge pump cycle to begin again.
The charge pump cycle will continue as long as
the operational conditions for the internal
oscillator are present.
SP3223EH +3.0V to +5.5V RS-232 Transceivers
12
© Copyright 2000 Sipex Corporation
Since both V+ and V– are separately generated
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 inefficiencies in the design.
The clock rate for the charge pump typically
operates at 250kHz. The external capacitors can
be as low as 0.1µF with a 16V breakdown
voltage rating.
S
H
U
T
RECEIVER +2.7V
0V
RS-232 INPUT
VOLTAGES -2.7V
D
O
W
N
VCC
STATUS
0V
tSTSL
tSTSH
tONLINE
+5V
DRIVER
RS-232 OUTPUT
VOLTAGES
0V
-5V
Figure 15. Auto-Online Timing Waveforms
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
13
© Copyright 2000 Sipex Corporation
VCC = +5V
C4
+5V
C1
+
C2
–
–5V
+
–
–
+
VDD Storage Capacitor
+
–
VSS Storage Capacitor
C3
–5V
Figure 16. Charge Pump — Phase 1
VCC = +5V
C4
C1
+
C2
–
+
–
–
+
+
–
–10V
C3
T
]
VDD Storage Capacitor
VSS Storage Capacitor
Figure 17. Charge Pump — Phase 2
[
+6V
a) C2+
T
1
0V
2
2
0V
b) C2T
-6V
Ch1 2.00V Ch2 2.00V M 1.00µs Ch1 1.96V
Figure 18. Charge Pump Waveforms
VCC = +5V
C4
+5V
+
C1
+
C2
–
–5V
–
+
–
–
+
VDD Storage Capacitor
VSS Storage Capacitor
C3
–5V
Figure 19. Charge Pump — Phase 3
VCC = +5V
+10V
C1
+
–
C2
C4
+
–
–
+
+
–
VDD Storage Capacitor
VSS Storage Capacitor
C3
Figure 20. Charge Pump — Phase 4
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
14
© Copyright 2000 Sipex Corporation
4
8.6
3.46
2.67
1.82
1.57
1.38
1.23
1.12
1.02
0.939
-2
0.62
0
4.93
Vout+
Vout-
2
0.869
Transmitter Output Voltage [V]
6
-4
-6
Load Current Per Transmitter [mA]
Figure 21. SP3243EH Driver Output Voltages vs. Load
Current per Transmitter
C5
C1
+
+
VCC
26
VCC
0.1µF
28 C1+
V+
27
0.1µF
C3
+
0.1µF
24 C11 C2+
C2
+
0.1µF
SP3243EH
V- 3
C4
2 C214 T1IN
T1OUT
13 T2IN
T2OUT 10
12 T3IN
T3OUT 11
+
0.1µF
9
20 R2OUT
R1IN 4
19 R1OUT
5KΩ
R2IN 5
18 R2OUT
5KΩ
R3IN
17 R3OUT
6
5KΩ
R4IN 7
16 R4OUT
5KΩ
15 R5OUT
VCC
22
23
To µP Supervisor
Circuit
R5IN
8
5KΩ
DB-9
Connector
SHUTDOWN
ONLINE
21 STATUS
6
7
8
9
GND
25
DB-9 Connector Pins:
1. Received Line Signal Detector
2. Received Data
3. Transmitted Data
4. Data Terminal Ready
5. Signal Ground (Common)
6.
7.
8.
9.
1
2
3
4
5
DCE Ready
Request to Send
Clear to Send
Ring Indicator
Figure 22. Circuit for the connectivity of the SP3243EH with a DB-9 connector
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
15
© Copyright 2000 Sipex Corporation
RS-232 SIGNAL
AT RECEIVER
INPUT
SHUTDOWN
INPUT
ONLINE INPUT
STATUS OUTPUT
TRANSCEIVER
STATUS
YES
HIGH
-
HIGH
Normal Operation
NO
HIGH
HIGH
LOW
Normal Operation
NO
HIGH
LOW
LOW
Shutdown
(Auto-Online)
YES
LOW
-
HIGH
Shutdown
NO
LOW
-
LOW
Shutdown
Table 3. Auto-Online Logic
RXINACT
Inactive Detection Block
RS-232
Receiver Block
RXIN
RXOUT
Figure 23. Stage I of Auto-Online Circuitry
Delay
Stage
Delay
Stage
Delay
Stage
Delay
Stage
Delay
Stage
STATUS
R1INACT
R4INACT
R3INACT
R2INACT
R5INACT
SHUTDOWN
Figure 24. Stage II of Auto-Online Circuitry
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
16
© Copyright 2000 Sipex Corporation
Auto-Online Circuitry
The second stage of the Auto-Online circuitry,
shown in Figure 24, 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, the external transmitters
are disabled, or the SHUTDOWN pin is
invoked. The typical accumulated delay is
around 20µs.
The SP3223EH and SP3243EH devices have a
patent pending Auto-Online circuitry on board
that saves power in applications such as laptop
computers, palmtop (PDA) computers and other
portable systems.
The SP3223EH and SP3243EH devices
incorporate an Auto-Online circuit that
automatically enables itself when the external
transmitters are enabled and the cable is
connected. Conversely, the Auto-Online circuit
also disables most of the internal circuitry when
the device is not being used and goes into a
standby mode where the device typically draws
1µA. This function can also be externally
controlled by the ONLINE pin. When this pin is
tied to a logic LOW, the Auto-Online function
is active. Once active, the device is enabled
until there is no activity on the receiver inputs.
The receiver input typically sees at least
+3V, which are generated from the transmitters
at the other end 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. When this
occurs over a period of time, the internal
transmitters will be disabled and the device goes
into a shutdown or standy mode. When ONLINE
is HIGH, the Auto-Online mode is disabled.
When the SP3223EH and SP3243EH 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.
The Auto-Online mode can be disabled by the
SHUTDOWN pin. If this pin is a logic LOW,
the Auto-Online function will not operate
regardless of the logic state of the ONLINE pin.
Table 3 summarizes the logic of the Auto-Online
operating modes. The truth table logic of the
SP3223EH and SP3243EH driver and receiver
outputs can be found in Table 2.
The STATUS pin outputs a logic LOW signal
if the device is shutdown. This pin goes to a
logic HIGH when the external transmitters are
enabled and the cable is connected.
When the SP3223EH and SP3243EH devices
are shut down, the charge pumps are turned off.
V+ charge pump output 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.
The Auto-Online circuit has two stages:
1) Inactive Detection
2) Accumulated Delay
The first stage, shown in Figure 23, detects an
inactive input. A logic HIGH is asserted on
RXINACT if the cable is disconnected or the
external transmitters are disabled. Otherwise,
RXINACT will be at a logic LOW. This circuit
is duplicated for each of the other receivers.
SP3223EHDS/11
For easy programming, the STATUS can be
used to indicate DTR or a Ring Indicator signal.
Tying ONLINE and SHUTDOWN together
will bypass the Auto-Online circuitry so this
connection acts like a shutdown input pin.
SP3223EH +3.0V to +5.5V RS-232 Transceivers
17
© Copyright 2000 Sipex Corporation
normal usage. The transceiver IC receives most
of the ESD current when the ESD source is
applied to the connector pins. The test circuit for
IEC1000-4-2 is shown on Figure 26. There are
two methods within IEC1000-4-2, the Air
Discharge method and the Contact Discharge
method.
ESD TOLERANCE
The SP3223EH/3243EH series 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 environments sensitive
to electro-static discharges and associated
transients. The improved ESD tolerance is at
least +15kV without damage nor latch-up.
With the Air Discharge Method, an ESD voltage
is applied to the equipment under test (EUT)
through air. This simulates an electrically charged
person ready to connect a cable onto the rear of
the system only to find an unpleasant zap just
before the person touches the back panel. The
high energy potential on the person discharges
through an arcing path to the rear panel of the
system before he 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. For example, the
rise time of the discharge current varies with the
approach speed.
There are different methods of ESD testing
applied:
a) MIL-STD-883, Method 3015.7
b) IEC1000-4-2 Air-Discharge
c) IEC1000-4-2 Direct Contact
The Human Body Model has been the generally
accepted ESD testing method for semiconductors. 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 discharge it to an integrated circuit.
The simulation is performed by using a test
model as shown in Figure 25. This method will
test the IC’s capability to withstand an ESD
transient during normal handling such as in
manufacturing areas where the ICs tend to be
handled frequently.
The Contact Discharge Method applies the ESD
current directly to the EUT. This method was
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-gap arc. In situations such as
hand held systems, the ESD charge can be directly
discharged to the equipment from a person already
holding the equipment. The current is transferred
on to the keypad or the serial port of the equipment
directly and then travels through the PCB and finally
to the IC.
The IEC-1000-4-2, formerly IEC801-2, is
generally used for testing ESD on equipment and
systems. For system manufacturers, they must
guarantee a certain amount of ESD protection
since the system 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 amount of static electricity when
ESD is applied to points and surfaces of the
equipment that are accessible to personnel during
R
RSS
RC
C
SW2
SW2
SW1
SW1
CSS
DC Power
Source
Device
Under
Test
Figure 25. ESD Test Circuit for Human Body Model
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
18
© Copyright 2000 Sipex Corporation
Contact-Discharge Module
RSS
R
RC
C
RV
SW2
SW1
Device
Under
Test
CSS
DC Power
Source
RS and RV add up to 330Ω
330Ω ffor
or IEC1000-4-2.
Figure 26. ESD Test Circuit for IEC1000-4-2
i➙
The circuit models in Figures 25 and 26 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.
30A
15A
0A
For the Human Body Model, the current limiting
resistor (RS) and the source capacitor (CS) are
1.5kΩ an 100pF, respectively. For IEC-1000-42, the current limiting resistor (RS) and the source
capacitor (CS) are 330Ω an 150pF, respectively.
t=0ns
t=30ns
t➙
Figure 27. ESD Test Waveform for IEC1000-4-2
The higher CS value and lower RS value in the
IEC1000-4-2 model are more stringent than the
Human Body Model. The larger storage capacitor
injects a higher voltage to the test point when
SW2 is switched on. The lower current limiting
resistor increases the current charge onto the test
point.
DEVICE PIN
TESTED
HUMAN BODY
MODEL
Air Discharge
Driver Outputs
Receiver Inputs
+15kV
+15kV
+15kV
+15kV
IEC1000-4-2
Direct Contact
+8kV
+8kV
Level
4
4
Table 4. Transceiver ESD Tolerance Levels
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
19
© Copyright 2000 Sipex Corporation
PACKAGE: PLASTIC
DUAL–IN–LINE
(NARROW)
E1 E
D1 = 0.005" min.
(0.127 min.)
A1 = 0.015" min.
(0.381min.)
D
A = 0.210" max.
(5.334 max).
C
A2
B1
B
e = 0.100 BSC
(2.540 BSC)
Ø
L
eA = 0.300 BSC
(7.620 BSC)
ALTERNATE
END PINS
(BOTH ENDS)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
16–PIN
20–PIN
28–PIN
A2
0.115/0.195
(2.921/4.953)
0.115/0.195
(2.921/4.953)
0.068/0.078
(1.73/1.99)
B
0.014/0.022
(0.356/0.559)
0.014/0.022
(0.356/0.559)
0.002/0.008
(0.05/0.21)
B1
0.045/0.070
(1.143/1.778)
0.045/0.070
(1.143/1.778)
0.010/0.015
(0.25/0.38)
C
0.008/0.014
(0.203/0.356)
0.008/0.014
(0.203/0.356)
0.397/0.407
(10.07/10.33)
D
SP3223EHDS/11
0.980/1.060
0.780/0.800
(19.812/20.320) (24.892/26.924)
0.205/0.212
(5.20/5.38)
E
0.300/0.325
(7.620/8.255)
0.300/0.325
(7.620/8.255)
0.0256 BSC
(0.65 BSC)
E1
0.240/0.280
(6.096/7.112)
0.240/0.280
(6.096/7.112)
0.301/0.311
(7.65/7.90)
L
0.115/0.150
(2.921/3.810)
0.115/0.150
(2.921/3.810)
0.022/0.037
(0.55/0.95)
O
0°/ 15°
(0°/15°)
0°/ 15°
(0°/15°)
0°/8°
(0°/8°)
SP3223EH +3.0V to +5.5V RS-232 Transceivers
20
© Copyright 2000 Sipex Corporation
PACKAGE: PLASTIC SHRINK
SMALL OUTLINE
(SSOP)
E
H
D
A
Ø
e
A1
B
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
SP3223EHDS/11
L
16–PIN
20–PIN
24–PIN
28–PIN
A
0.068/0.078
(1.73/1.99)
0.068/0.078
(1.73/1.99)
0.068/0.078
(1.73/1.99)
0.068/0.078
(1.73/1.99)
A1
0.002/0.008
(0.05/0.21)
0.002/0.008
(0.05/0.21)
0.002/0.008
(0.05/0.21)
0.002/0.008
(0.05/0.21)
B
0.010/0.015
(0.25/0.38)
0.010/0.015
(0.25/0.38)
0.010/0.015
(0.25/0.38)
0.010/0.015
(0.25/0.38)
D
0.239/0.249
(6.07/6.33)
0.278/0.289
(7.07/7.33)
0.317/0.328
(8.07/8.33)
0.397/0.407
(10.07/10.33)
E
0.205/0.212
(5.20/5.38)
0.205/0.212
(5.20/5.38)
0.205/0.212
(5.20/5.38)
0.205/0.212
(5.20/5.38)
e
0.0256 BSC
(0.65 BSC)
0.0256 BSC
(0.65 BSC)
0.0256 BSC
(0.65 BSC)
0.0256 BSC
(0.65 BSC)
H
0.301/0.311
(7.65/7.90)
0.301/0.311
(7.65/7.90)
0.301/0.311
(7.65/7.90)
0.301/0.311
(7.65/7.90)
L
0.022/0.037
(0.55/0.95)
0.022/0.037
(0.55/0.95)
0.022/0.037
(0.55/0.95)
0.022/0.037
(0.55/0.95)
O
0°/8°
(0°/8°)
0°/8°
(0°/8°)
0°/8°
(0°/8°)
0°/8°
(0°/8°)
SP3223EH +3.0V to +5.5V RS-232 Transceivers
21
© Copyright 2000 Sipex Corporation
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(WIDE)
E
H
D
A
Ø
e
B
A1
L
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
SP3223EHDS/11
28–PIN
A
0.093/0.104
(2.352/2.649)
A1
0.004/0.012
(0.102/0.300)
B
0.013/0.020
(0.330/0.508)
D
0.697/0.713
(17.70/18.09)
E
0.291/0.299
(7.402/7.600)
e
0.050 BSC
(1.270 BSC)
H
0.394/0.419
(10.00/10.64)
L
0.016/0.050
(0.406/1.270)
O
0°/8°
(0°/8°)
SP3223EH +3.0V to +5.5V RS-232 Transceivers
22
© Copyright 2000 Sipex Corporation
PACKAGE:
PLASTIC THIN SMALL
OUTLINE
(TSSOP)
E2
E
D
A
Ø
e
B
A1
L
DIMENSIONS
in inches (mm)
Minimum/Maximum
SP3223EHDS/11
20–PIN
A
- /0.043
(- /1.10)
A1
0.002/0.006
(0.05/0.15)
B
0.007/0.012
(0.19/0.30)
D
0.252/0.260
(6.40/6.60)
E
0.169/0.177
(4.30/4.50)
e
0.026 BSC
(0.65 BSC)
E2
0.126 BSC
(3.20 BSC)
L
0.020/0.030
(0.50/0.75)
O
0°/8°
SP3223EH +3.0V to +5.5V RS-232 Transceivers
23
© Copyright 2000 Sipex Corporation
ORDERING INFORMATION
Model
SP3223EHCP
SP3223EHCA
SP3223EHCY
SP3243EHCT
SP3243EHCA
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Temperature Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
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0°C to +70°C
0°C to +70°C
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Package Types
20-pin PDIP
20-pin SSOP
20-pin TSSOP
○
○
28-pin Wide SOIC
28-pin SSOP
○
○
○
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: [email protected]
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.
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
24
© Copyright 2000 Sipex Corporation