DS229N [DALLAS]
Triple RS-232 Transmitter/Receiver; 三重RS - 232发射器/接收器
| 型号： | DS229N |
| 厂家： | 
DALLAS SEMICONDUCTOR |
| 描述： | Triple RS-232 Transmitter/Receiver |
| 文件： | 总9页 (文件大小：99K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS229
Triple RS-232 Transmitter/Receiver
www.dalsemi.com
FEATURES
PIN ASSIGNMENT
ꢀ Compatible with DS1229
ꢀ 5V operation
VCC
GND
C1+
V+
C1-
1
20
19
2
3
4
18
17
T1OUT
R1IN
R1OUT
ꢀ 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 µF
ꢀ Optional industrial temperature range
available (-40°C to +85°C)
C2+
C2-
V-
5
6
16
15
T1IN
T2IN
R2OUT
T3IN
R3OUT
T2OUT
R2IN
7
8
14
13
T3OUT
R3IN
9
10
12
11
20-Pin DIP, SOIC AND TSSOP
PIN DESCRIPTION
ORDERING INFORMATION
VCC
- +5-Volt Supply
DS229
20-pin DIP
GND
- Ground
DS229N
DS229S
DS229SN
DS229E
DS229EN
20-pin DIP (Industrial)
20-pin SOIC
20-pin SOIC (Industrial)
20-pin TSSOP
V+
V-
- Positive Supply Output
- Negative Supply Output
- RS-232 Driver Inputs
T1IN, T2IN, T3IN
T1OUT, T2OUT, T3OUT - RS-232 Driver Outputs
R1IN, R2IN, R3IN - Receiver Inputs
R1OUT, R2OUT, R3OUT - Receiver Outputs
20-pin TSSOP (Industrial)
C1+, C1-
C2+, C2-
- Capacitor 1 Connections
- 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 µF 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.
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112099
DS229
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
VCC, GND: DC power is provided to the device on these pins. VCC is the +5-volt input.
V+: Positive supply output (RS-232). V+ requires an external storage charge capacitor of at least 0.1 µF.
A larger capacitor (up to 10 µF) can be used to reduce supply ripple.
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DS229
V-: Negative supply output (RS-232). V- requires an external storage capacitor of at least 0.1 µF. A
larger capacitor (up to 10 µF) can be used to reduce supply ripple.
T1IN, T2IN, T3IN: Standard TTL/CMOS inputs for the RS-232 drivers. The inputs of unused drivers can
be left unconnected since each input has a 400 kΩ pullup resistor.
T1OUT, T2OUT, T3OUT: Driver outputs at RS-232 levels. Driver output swing meets RS-232 levels for
loads up to 3 kΩ. These driver outputs provide current necessary to meet RS-232 levels for loads up to
2500 pF.
R1IN, R2IN, R3IN: Receiver inputs. These inputs accept RS-232 level signals (±25 volts) into a protected
5 kΩ terminating resistor. Each receiver provides 0.5V hysteresis (typical) for noise immunity.
R1OUT, R2OUT, R3OUT: Receiver outputs at TTL/CMOS levels.
C1+, C1-, C2+, C2-: Charge pump capacitor inputs. These pins require two external capacitors (0.1 µF
minimum, 10 µF 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
µF. Larger capacitors (up to 10 µF) 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 kΩ=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 kΩ=load
and 2500 pF are met at maximum operating temperature and VCC equal to 4.5 volts. Typical voltage
swings of ±8 volts occur when loaded with a nominal 5 kΩ=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/µs. Typical slew rates
are 20 volts/µs unloaded and 12 volts/µs with 3 kΩ=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
kΩ=and can withstand up to ±30 volts with or without VCC 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.
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DS229
ABSOLUTE MAXIMUM RATINGS*
Absolute Maximum Ratings
VCC
V+
V-
-0.3V to +7.0V
(VCC-0.3V) to +14V
+0.3V to -14V
Input Voltages
TIN
-0.3V to (VCC+0.3V)
RIN
±30V
Output Voltages
TOUT
ROUT
(V+ + 0.3V) to (V- - 0.3V)
-0.3V to (VCC+ 0.3V)
Continuous
Short Circuit Duration, TOUT
* 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
VCC 4.5
5.5
V
1
DC ELECTRICAL CHARACTERISTICS
(0°C to 70°C)
PARAMETER
SYMBOL MIN
TYP
6
MAX UNITS NOTES
Power Supply Current (No Load)
ICC1
ICC2
15
mA
mA
22.5
Power Supply Current (3 kΩ Load All
Outputs)
RS-232 Transmitters
Output Voltage Swing
Input Logic Threshold Low
Input Logic Threshold High
Data Rate
VORS
VTTL
VTTH
fD
V
V
2
±5
±8
1.4
1.4
200
5
0.8
2.0
116
40
V
kbits/s
µA
Ω
Logic Pullup/Input Current
Transmitter Output Resistance
Output Short-Circuit Current
IPU
ROUT
ITSC
300
10M
3
4
mA
±15
±30
±100
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DS229
DC ELECTRICAL CHARACTERISTICS (continued)
(0°C to 70°C)
RS-232 Receivers
RS-232 Input Voltage Operating Range
RS-232 Input Threshold Low
RS-232 Input Threshold High
RS-232 Input Hysteresis
VIR
VRTL
VRTH
VHY
RIN
V
V
±25
±30
1.3
0.8
1.8
2.4
1
V
0.2
3
0.5
V
RS-232 Input Resistance
5
7
kΩ
TTL/CMOS Output Voltage Low
TTL/CMOS Output Voltage High
VROL
VROH
IRSC
0.2
0.4
V
V
5
6
3.5
-2
VCC-0.2
-10
TTL/CMOS Output Short Circuit
Current (VOUT=GND)
mA
TTL/CMOS Output Short Circuit
Current (VOUT=VCC)
IRSC
10
30
mA
AC ELECTRICAL CHARACTERISTICS
(0°C to 70°C)
PARAMETER
SYMBOL MIN
TYP
MAX UNITS NOTES
Transition Slew Rate
tSR
6
12
30
7
V/µs
Transmitter Propagation
Delay TTL to RS-232
tPHLT
tPLHT
1.3
1.5
3.5
3.5
µs
µs
Receiver Propagation
Delay RS-232 to TTL
tPHLR
tPLHR
0.5
0.6
1
1
µs
µs
Transmitter + to - Propagation
Delay Difference
tPHLT
-tPLHT
300
ns
Receiver + to - Propagation
Delay Difference
tPHLR
-tPLHR
100
ns
NOTES:
1. All voltages are referenced to ground.
2. All transmitter outputs loaded with 3 kΩ=to ground
3. VCC = V+ = V- = 0V; VOUT = ±2V.
4. VOUT = 0V.
5. IOUT = 3.2 mA.
6. IOUT = -1.0 mA.
7. CL = 50 pF - 2500 pF; RL = 3 kΩ=- 7 kΩ; VCC = 5V; TA = 25°C.
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DS229
TRANSMITTER PROPAGATION DELAY TIMING Figure 2
RECEIVER PROPAGATION DELAY TIMING Figure 3
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DS229
20-PIN DIP (300-MIL)
PKG
DIM
20-PIN
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
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DS229
20-PIN SOIC (300-MIL)
PKG
DIM
20-PIN
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
Θ
0°
8°
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DS229
20-PIN TSSOP
DIM
A MM
A1 MM
A2 MM
C MM
L MM
e1 MM
B MM
D MM
E MM
G MM
H MM
phi
MIN
-
MAX
1.10
-
0.05
0.75
0.09
0.50
1.05
0.18
0.70
0.65 BSC
0.18
6.40
0.30
6.90
4.40 NOM
0.25 REF
6.25
0°
6.55
8°
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