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112099
FEATURES
Compatible with DS1229
5V operation
20-pin DIP or SOIC package
20-pin TSSOP package for height restricted
applications
Operate from single +5V power
Meets all EIA-232E and V.28 specifications
Uses small capacitors: 0.1
F
Optional industrial temperature range
available (-40
C to +85
C)
ORDERING INFORMATION
DS229 20-pin
DIP
DS229N 20-pin
DIP
(Industrial)
DS229S 20-pin
SOIC
DS229SN
20-pin SOIC (Industrial)
DS229E 20-pin
TSSOP
DS229EN
20-pin TSSOP (Industrial)
PIN ASSIGNMENT
PIN DESCRIPTION
V
CC
- +5-Volt Supply
GND -
Ground
V+
- Positive Supply Output
V-
- Negative Supply Output
T1
IN
, T2
IN
, T3
IN
- RS-232 Driver Inputs
T1
OUT
, T2
OUT
, T3
OUT
- RS-232 Driver Outputs
R1
IN
, R2
IN
, R3
IN
-
Receiver
Inputs
R1
OUT
, R2
OUT
, R3
OUT
- Receiver Outputs
C1+, C1-
- Capacitor 1 Connections
C2+, C2-
- Capacitor 2 Connections
DESCRIPTION
The DS229 is a triple RS-232 driver/receiver pair that generates RS-232 voltage levels from a single +5-
volt power supply. Additional
12-volt supplies are not needed since the DS229 uses on-board charge
pumps to convert the +5-volt supply to
10 volts. The DS229 is fully compliant with EIA RS-232E and
V.28/V.24 standards. The DS229 contains three drivers and three receivers. Driver slew rates and data
rates are guaranteed up to 116 kbits/sec. The DS229 operates with only 0.1
F charge pump capacitors.
OPERATION
The diagram in Figure 1 shows the main elements of the DS229. The following paragraphs describe the
function of each pin.
DS229
Triple RS-232 Transmitter/Receiver
www.dalsemi.com
20-Pin DIP, SOIC AND TSSOP
19
C1-
C2-
T2
OUT
R2
IN
T3
OUT
R3
IN
V
CC
R1
IN
R1
OUT
T1
IN
T2
IN
R2
OUT
T3
IN
R3
OUT
1
2
3
4
5
6
7
8
9
10
20
18
17
16
15
14
13
12
11
V+
C2+
V-
C1+
GND
T1
OUT
DS229
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FUNCTIONAL DIAGRAM OF DS229 Figure 1
NOTE: C5 is a recommended decoupling capacitor which is the same value as C1, C2, C3, and C4.
PIN DESCRIPTIONS
V
CC
, GND: DC power is provided to the device on these pins. V
CC
is the +5-volt input.
V+: Positive supply output (RS-232). V+ requires an external storage charge capacitor of at least 0.1
F.
A larger capacitor (up to 10
F) can be used to reduce supply ripple.
DS229
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V-: Negative supply output (RS-232). V- requires an external storage capacitor of at least 0.1
F. A
larger capacitor (up to 10
F) can be used to reduce supply ripple.
T1
IN
, T2
IN
, T3
IN
: Standard TTL/CMOS inputs for the RS-232 drivers. The inputs of unused drivers can
be left unconnected since each input has a 400 k
pullup resistor.
T1
OUT
, T2
OUT
, T3
OUT
: Driver outputs at RS-232 levels. Driver output swing meets RS-232 levels for
loads up to 3 k
. These driver outputs provide current necessary to meet RS-232 levels for loads up to
2500 pF.
R1
IN
, R2
IN
, R3
IN
: Receiver inputs. These inputs accept RS-232 level signals (25 volts) into a protected
5 k
terminating resistor. Each receiver provides 0.5V hysteresis (typical) for noise immunity.
R1
OUT
, R2
OUT
, R3
OUT
: Receiver outputs at TTL/CMOS levels.
C1+, C1-, C2+, C2-: Charge pump capacitor inputs. These pins require two external capacitors (0.1
F
minimum, 10
F maximum and should be the same size as C3 and C4). Capacitor 1 is connected between
C1+ and C1-. Capacitor 2 is connected between C2+ and C2-. Capacitor C1 can be omitted if +12 volts is
connected directly to V+. Likewise, C2 can be omitted if -12V is connected directly to V-.
DUAL CHARGE PUMP CONVERTERS
The DS229 has a two stage on-board charge pump circuit that is used to generate
10 volts from a single
+5-volt supply. In the first stage, capacitor C1 doubles the +5V supply to +10 volts which is then stored
on capacitor C3. The second stage uses capacitor C2 to invert the +10V potential to -10V. This charge is
then stored on capacitor C4. The
10-volt supplies allow the DS229 to provide the necessary output
levels for RS-232 communication. The DS229 will operate with charge pump capacitors as low as 0.1
F. Larger capacitors (up to 10
F) can be used to reduce supply ripple.
RS-232 DRIVERS
The three RS-232 drivers are powered by the internal
10-volt supplies generated by the on-board charge
pump. The driver inputs are both TTL and CMOS compatible. Each input has an internal 400 k
=pullup
resistor so that unused transmitter inputs can be left unconnected. The open circuit output voltage swing
is from (V+ - 0.6) to V- volts. Worst case conditions for EIA-232E/V.28 of
5 volts driving a 3 k
=load
and 2500 pF are met at maximum operating temperature and V
CC
equal to 4.5 volts. Typical voltage
swings of
8 volts occur when loaded with a nominal 5 k
=RS-232 receiver. As required by EIA-232E
and V.28 specifications, the slew rate at the output is limited to less than 30 volts/
s. Typical slew rates
are 20 volts/
s unloaded and 12 volts/
s with 3 k
=and 2500 pF load. These slew rates allow for bit rates
of over 116 kbits/s. Driver outputs maintain high impedance when power is off.
RS-232 RECEIVERS
The three receivers conform fully to the RS-232E specifications. The input impedance is typically 5
k
=and can withstand up to
30 volts with or without V
CC
applied. The input switching thresholds are
within the
3-volt limit of RS-232E specification with an input threshold low of 0.8 volts and an input
threshold high of 2.4 volts. The receivers have 0.5 volts of hysteresis (typical) to improve noise rejection.
The TTL/CMOS compatible outputs of the receivers will be low whenever the RS-232 input is greater
than 2.4 volts. The receiver output will be high when the input is floating or driven between +0.8 volts
and -25 volts.
DS229
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ABSOLUTE MAXIMUM RATINGS*
Absolute Maximum Ratings
V
CC
-0.3V to +7.0V
V+ (V
CC
-0.3V) to +14V
V-
+0.3V to -14V
Input Voltages
T
IN
-0.3V to (V
CC
+0.3V)
R
IN
30V
Output Voltages
T
OUT
(V+ + 0.3V) to (V- - 0.3V)
R
OUT
-0.3V to (V
CC
+ 0.3V)
Short Circuit Duration, T
OUT
Continuous
*
This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS (0
C to 70
C)
PARAMETER
SYMBOL
MIN
TYP
MAX UNITS NOTES
Operating Supply Voltage
V
CC
4.5
5.5
V
1
DC ELECTRICAL CHARACTERISTICS (0
C to 70
C)
PARAMETER
SYMBOL
MIN
TYP
MAX UNITS NOTES
Power Supply Current (No Load)
I
CC1
6
15
mA
Power Supply Current (3 k
Load All
Outputs)
I
CC2
22.5
mA
RS-232 Transmitters
Output Voltage Swing
V
ORS
5
8
V
2
Input Logic Threshold Low
V
TTL
0.8
1.4
V
Input Logic Threshold High
V
TTH
1.4
2.0
V
Data Rate
f
D
200
116
kbits/s
Logic Pullup/Input Current
I
PU
5
40
A
Transmitter Output Resistance
R
OUT
300
10M
3
Output Short-Circuit Current
I
TSC
15
30
100
mA
4
DS229
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DC ELECTRICAL CHARACTERISTICS (continued) (0
C to 70
C)
RS-232 Receivers
RS-232 Input Voltage Operating Range
V
IR
25
30
V
RS-232 Input Threshold Low
V
RTL
0.8
1.3
V
RS-232 Input Threshold High
V
RTH
1.8
2.4
V
RS-232 Input Hysteresis
V
HY
0.2
0.5
1
V
RS-232 Input Resistance
R
IN
3
5
7
k
TTL/CMOS Output Voltage Low
V
ROL
0.2
0.4
V
5
TTL/CMOS Output Voltage High
V
ROH
3.5
V
CC
-0.2
V
6
TTL/CMOS Output Short Circuit
Current (V
OUT
=GND)
I
RSC
-2
-10
mA
TTL/CMOS Output Short Circuit
Current (V
OUT
=V
CC
)
I
RSC
10
30
mA
AC ELECTRICAL CHARACTERISTICS (0
C to 70
C)
PARAMETER
SYMBOL
MIN
TYP
MAX UNITS NOTES
Transition Slew Rate
t
SR
6
12
30
V/
s
7
Transmitter Propagation
Delay TTL to RS-232
t
PHLT
t
PLHT
1.3
1.5
3.5
3.5
s
s
Receiver Propagation
Delay RS-232 to TTL
t
PHLR
t
PLHR
0.5
0.6
1
1
s
s
Transmitter + to - Propagation
Delay Difference
t
PHLT
-t
PLHT
300
ns
Receiver + to - Propagation
Delay Difference
t
PHLR
-t
PLHR
100
ns
NOTES:
1.
All voltages are referenced to ground.
2.
All transmitter outputs loaded with 3 k
=to ground
3.
V
CC
= V+ = V- = 0V; V
OUT
=
2V.
4.
V
OUT
= 0V.
5.
I
OUT
= 3.2 mA.
6.
I
OUT
= -1.0 mA.
7.
C
L
= 50 pF - 2500 pF; RL = 3 k
=- 7 k
; V
CC
= 5V; TA = 25
C.
DS229
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TRANSMITTER PROPAGATION DELAY TIMING Figure 2
RECEIVER PROPAGATION DELAY TIMING Figure 3
DS229
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20-PIN DIP (300-MIL)
PKG
20-PIN
DIM
MIN
MAX
A IN.
MM
0.970
24.63
1.040
26.42
B IN.
MM
0.240
6.09
0.270
6.86
C IN.
MM
0.120
3.05
0.140
3.56
D IN.
MM
0.295
7.49
0.325
8.26
E IN.
MM
0.015
0.38
0.040
1.02
F IN.
MM
0.120
3.04
0.140
3.56
G IN.
MM
0.090
2.23
0.110
2.79
H IN.
MM
0.310
7.87
0.390
9.91
J IN.
MM
0.008
0.20
0.012
0.30
K IN.
MM
0.015
0.38
0.021
0.53
DS229
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20-PIN SOIC (300-MIL)
PKG
20-PIN
DIM
MIN
MAX
A IN.
MM
0.094
2.39
0.105
2.67
A1 IN.
MM
0.004
0.102
0.012
0.30
A2 IN.
MM
0.089
2.26
0.095
2.41
b IN.
MM
0.013
0.33
0.020
0.51
C IN.
MM
0.009
0.229
0.013
0.33
D IN.
MM
0.498
12.65
0.511
12.99
e IN.
MM
0.050 BSC
1.27 BSC
E1 IN.
MM
0.290
7.37
0.300
7.62
H IN.
MM
0.398
10.11
0.416
10.57
L IN.
MM
0.016
0.40
0.040
1.02
0
8
DS229
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20-PIN TSSOP
DIM
MIN
MAX
A MM
-
1.10
A1 MM
0.05
-
A2 MM
0.75
1.05
C MM
0.09
0.18
L MM
0.50
0.70
e1 MM
0.65 BSC
B MM
0.18
0.30
D MM
6.40
6.90
E MM
4.40 NOM
G MM
0.25 REF
H MM
6.25
6.55
phi
0
8
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