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(R)
SP385A
+3V to +5V RS-232 Line Driver/Receiver
s Operates from 3.3V or 5V Power Supply s Meets All EIA-232D and V.28 Specifications at 5V s Meets EIA-562 Specifications at 3.3V s Two Drivers and Receivers s Operates with 0.1F to 10F Capacitors s High Data Rate -- 120kbps Under Load s Low Power Shutdown 1A s 3-State TTL/CMOS Receiver Outputs s Low Power CMOS -- 5mA Operation
DESCRIPTION... The Sipex SP385A is an enhanced version of the Sipex SP200 family of RS232 line drivers/ receivers. The SP385A offers +3.3V operation for EIA-562 and EIA-232 applications. The SP385A maintains the same performance features offered in its predecessors. The SP385A is available in plastic SOIC or SSOP packages operating over the commercial and industrial temperature ranges. The SP385A is pin compatible to the LTC1385 EIA-562 transceiver, except the drivers in the SP385A can only be disabled with the ON/OFF pin.
RS232 OUTPUTS
RS232 INPUTS
CHARGE PUMP
T1
T2
R 1 R 2
TTL/CMOS INPUTS TTL/CMOS OUTPUTS
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
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. Vcc ................................................................................................................................................................. +6V V+ .................................................................................................................... (Vcc-0.3V) to +13.2V V- .............................................................................................................................................................. 13.2V Input Voltages TIN ......................................................................................................................... -0.3 to (Vcc +0.3V) RIN ............................................................................................................................................................ 15V
Output Voltages TOUT .................................................................................................... (V+, +0.3V) to (V-, -0.3V) ROUT ................................................................................................................ -0.3V to (Vcc +0.3V) Short Circuit Duration TOUT ......................................................................................................................................... Continuous Power Dissipation CERDIP .............................................................................. 675mW (derate 9.5mW/C above +70C) Plastic DIP .......................................................................... 375mW (derate 7mW/C above +70C) Small Outline ...................................................................... 375mW (derate 7mW/C above +70C)
SPECIFICATIONS
VCC=+3.3V10%; 0.1F charge pump capacitors; TMIN to TMAX unless otherwise noted.
PARAMETERS TTL INPUT Logic Threshold Low High Logic Pullup Current Maximum Data Rate TTL OUTPUT TTL/CMOS Output Voltage, Low Voltage, High Leakage Current; TA = +25C EIA-562 OUTPUT Output Voltage Swing
MIN.
TYP.
MAX.
UNITS
CONDITIONS
0.8 2.0 15 120 200
Volts Volts A kbps
TIN ; ON/OFF Vcc = 3.3V TIN ; ON/OFF Vcc = 3.3V TIN = 0V CL = 2500pF, RL= 3k
0.5 2.4 0.05 3.7 4.2 10 +15 1.2 1.7 0.5 5 4.0 1.5 30 10 300 1000 3 8 0.010 6 5 2.4 1.0 7 10
Volts Volts A Volts mA Volts Volts Volts Volts k s s V/s V/s ns ns mA mA A
IOUT = 3.2mA; Vcc = 3.3V IOUT = -1.0mA ON/OFF=0V, 0V VOUT VCC All transmitter outputs loaded with 3k to ground VCC = 0V; VOUT = 2V Infinite duration
Power-Off Output Resistance 300 Output Short Circuit Current EIA-562 INPUT Voltage Range -15 Voltage Threshold Low 0.8 High Hysteresis 0.2 Resistance 3 DYNAMIC CHARACTERISTICS Driver Propagation Delay Receiver Propagation Delay Instantaneous Slew Rate Transition Region Slew Rate Output Enable Time Output Disable Time POWER REQUIREMENTS VCC Power Supply Current Shutdown Supply Current
VCC = 3.3V, TA = +25C VCC = 3.3V, TA = +25C VCC = 3.3V, TA = +25C VIN = 15V to -15V TTL to RS-562 RS-562 to TTL CL = 10pF, RL= 3k - 7k; TA = +25C CL = 2500pF, RL= 3k; measured from +2V to -2V or -2V to +2V
No load, TA= +25C; VCC = 3.3V All transmitters RL = 3k TA = +25C VCC = 3.3V, TA = +25C
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
2
SPECIFICATIONS
VCC=+5V10%; 0.1F charge pump capacitors; TMIN to TMAX unless otherwise noted.
PARAMETERS TTL INPUT Logic Threshold Low High Logic Pullup Current Maximum Data Rate TTL OUTPUT TTL/CMOS Output Voltage, Low Voltage, High Leakage Current; TA = +25C EIA-232 OUTPUT Output Voltage Swing
MIN.
TYP.
MAX.
UNITS
CONDITIONS
0.8 2.0 15 120 200
Volts Volts A kbps
TIN ; ON/OFF TIN ; ON/OFF TIN = 0V CL = 2500pF, RL= 3k
0.4 3.5 0.05 5 9 18 +15 1.2 1.7 0.5 5 4.0 1.5 30 10 400 250 10 25 1 15 10 2.4 1.0 7 10
Volts Volts A Volts mA Volts Volts Volts Volts k s s V/s V/s ns ns mA mA A
IOUT = 3.2mA; Vcc = +5V IOUT = -1.0mA ON/OFF = O, 0V VOUT VCC All transmitter outputs loaded with 3k to ground VCC = 0V; VOUT = 2V Infinite duration
Power-Off Output Resistance 300 Output Short Circuit Current EIA-232 INPUT Voltage Range -15 Voltage Threshold Low 0.8 High Hysteresis 0.2 Resistance 3 DYNAMIC CHARACTERISTICS Driver Propagation Delay Receiver Propagation Delay Instantaneous Slew Rate Transition Region Slew Rate Output Enable Time Output Disable Time POWER REQUIREMENTS VCC Power Supply Current Shutdown Supply Current
VCC = 5V, TA = +25C VCC = 5V, TA = +25C VCC = 5V, TA = +25C VIN = 15V to -15V TTL to RS-232 RS-232 to TTL CL = 10pF, RL= 3k - 7k; TA =+25C CL = 2500pF, RL= 3k; measured from +3V to -3V or -3V to +3V
No load, TA= +25C; VCC = 5V All transmitters RL = 3k; TA = +25C VCC = 5V, TA = +25C
PERFORMANCE CURVES
-11 -10 -9 12
30
8.4 8.2
10 VCC = 6V VCC = 5V VCC = 4V 6
25 20 VCC = 6V
VOH (Volts)
8.0 7.8 7.6 7.4 7.2 7.0
Load current = 0mA TA = 25C
V- Voltage (Volts)
V+ (Volts)
-8 -7 -6 -5 -4 -3
VCC = 6V VCC = 5V
8
ICC (mA)
15 VCC = 5V 10 VCC = 4V 5 VCC = 3V
4 VCC = 4V 2 0
0
2
4
6
8
10
12
14
0
5
10
15
20
25
30
35
40
0 -55
-40
0
25
70
85
125
6.8 4.5
4.75
5.0 VCC (Volts)
5.25
5.5
Load Current (mA)
Load Current (mA)
Temperature (C)
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
3
PINOUT...
20 19 18 17
N/C C1 + V+ C1 C2 + C2 VT2 OUT R2 IN
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
ON/OFF VCC GND T1 OUT R1 IN R1 OUT T1 IN T2 IN R2 OUT
N/C C1 + V+ C1 C2 + C2 VT2 OUT R2 IN N/C
1 2 3 4
ON/OFF VCC GND T1 OUT R1 IN R1 OUT T1 IN T2 IN R2OUT N/C
TYPICAL OPERATING CIRCUIT...
+5V INPUT 0.1 F
SP385A
+
17 C+
1
SP385A
5 6 7 8 9 10
16 15 14 13 12 11
+5V INPUT 0.1 F
+
19 0.1 F 16V 3+
2 0.1 F + 6.3V 4 5 C 1C+
2
V
CC
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter 400K
3+ V+
0.1 F 16V
2 0.1 F + 6.3V 4 5 C+
1
V
CC
C 1C+
2
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter 400K
V+
0.1 F + 16V 6
TTL/CMOS INPUTS
V-
7
+ 0.1 F
16V
C 2-
0.1 F + 16V 6
TTL/CMOS INPUTS
V-
7
+ 0.1 F
16V
C 2-
T1 IN
12
T1
400K
15
T 1OUT
T1 IN
14
T1
400K
17
T 1OUT
T2 IN
11
T2
8
T 2OUT
T2 IN
13
T2
8
T 2OUT
TTL/CMOS OUTPUTS
RS232 INPUTS
R 1 OUT
R1
5K
R 1 IN
R 1 OUT
R1
5K
R 1 IN
R 2 OUT
10
R2
5K
9
R 2 IN
R 2 OUT
12
R2
5K
9
R 2 IN
SP311A SP385A
GND 16
18
ON/OFF
SP311A SP385A
GND 18
20
ON/OFF
SOIC Package
SSOP Package
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
4
RS232 INPUTS
13
14
TTL/CMOS OUTPUTS
15
16
RS232 OUTPUTS
RS232 OUTPUTS
FEATURES... The Sipex SP385A is a +3V to +5V EIA-232/EIA562 line transceiver. It is a pin-for-pin alternative for the SP310A and will operate in the same socket with capacitors ranging from 0.1F to 10F, either polarized or non-polarized, in +3V supplies. The SP385A offers the same features such as 120kbps guaranteed transmission rate, increased drive current for longer and more flexible cable configurations, low power dissipation and overall ruggedized construction for commercial and industrial environments. The SP385A also includes a shutdown feature that tri-states the drivers and the receivers. The SP385A includes a charge pump voltage converter which allows it to operate from a single +3.3V or +5V supply. These converters double the VCC voltage input in order to generate the EIA-232 or EIA562 output levels. For +5V operation, the SP385A driver outputs adhere to all EIA-232D and CCITT V.28 specifications. While at +3.3V operation, the outputs adhere to EIA-562 specifications. Due to Sipex's efficient charge pump design, the charge pump levels and the driver outputs are less noisy than other 3V EIA-232 transceivers. The SP385A has a single control line which simultaneously shuts down the internal DC/DC converter and puts all transmitter and receiver outputs into a high impedance state. The SP385A is available in 18-pin plastic SOIC and 20-pin plastic SSOP packages for operation over commercial and industrial temperature ranges. Please consult the factory for surfacemount packaged parts supplied on tape-on-reel as well as parts screened to MIL-M-38510. The SP385A is ideal for +3.3V battery applications requiring low power operation. The charge pump strength allows the drivers to provide 4.0V signals, plenty for typical EIA-232 applications since the EIA-232 receivers have input sensitivity levels of less than 3V. THEORY OF OPERATION The SP385A device is made up of three basic circuit blocks -- 1) a driver/transmitter, 2) a receiver and 3) a charge pump.
Driver/Transmitter The drivers are inverting transmitters, which accept TTL or CMOS inputs and output the RS-232 signals with an inverted sense relative to the input logic levels. Typically the RS-232 output voltage swing is 9V for 5V supply and 4.2V for 3.3V supply. Even under worst case loading conditions of 3k and 2500pF, the output is guaranteed to be 5V for a 5V supply and 3.7V for a 3.3V supply which adheres to EIA-232 and EIA562 specifications, respecitively. The transmitter outputs are protected against infinite short-circuits to ground without degradation in reliability. The instantaneous slew rate of the transmitter output is internally limited to a maximum of 30V/ s in order to meet the standards [EIA 232-D 2.1.7, Paragraph (5)]. However, the transition region slew rate of these enhanced products is typically 10V/s. The smooth transition of the loaded output from VOL to VOH clearly meets the monotonicity requirements of the standard [EIA 232-D 2.1.7, Paragraphs (1) & (2)]. Receivers The receivers convert RS-232 input signals to inverted TTL signals. Since the 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 500mV. This ensures that the receiver is virtually immune to noisy transmission lines. The input thresholds are 0.8V minimum and 2.4V maximum, again well within the 3V RS-232 requirements. The receiver inputs are also protected against voltages up to 15V. Should an input be left unconnected, a 5k pull-down resistor to ground will commit the output of the receiver to a high state. In actual system applications, it is quite possible for signals to be applied to the receiver inputs before power is applied to the receiver circuitry. This occurs for example when a PC user attempts to print only to realize the printer wasn't turned on. In this case an RS-232 signal from the PC will appear on the receiver input at the printer. When the printer power is turned on, the receiver will operate normally. All of these enhanced devices are fully protected.
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
5
S1 V
CC
S3 V+ = 2VCC +
S1 V+ S3 GND + S2 C2 + S4 C4 V- = -(V+)
S2 GND
C1
+ S4
C3 V
CC
FROM VOLTAGE DOUBLER
GND
INTERNAL OSCILLATOR
INTERNAL OSCILLATOR
Figure 1. Charge Pump Voltage Doubler
Figure 2. Charge Pump Voltage Inverter
Charge Pump The charge pump section of the these devices allows the circuit to operate from a single +5V 10% power supply by generating the required operating voltages internal to the devices. The charge pump consists of two sections -- 1) a voltage doubler and 2) a voltage inverter. As shown in Figure 1, an internal oscillator triggers the charge accumulation and voltage inversion. The voltage doubler momentarily stores a charge on capacitor C1 equal to Vcc, referenced to ground. During the next transition of the oscillator this charge is boot-strapped to transfer charge to capacitor C3. The voltage across C3 is now from Vcc to V+. In the inverter section (Figure 2), the voltage across C3 is transferred to C2 forcing a range of 0V to V+ across C2. Boot-strapping of C2 will then transfer charge to C4 to genrate V-. One of the significant enhancements over previous products of this type is that the values of the capacitors are no longer critical and have been decreased in size considerably to 0.1F. Because the charge pump runs at a higher frequency, the 0.1F capacitors are sufficient to transfer and sustain charges to the two transmitters. APPLICATION HINTS Protection From Shorts to 15V The driver outputs are protected against shorts to ground, other driver outputs, and V+ or V-. If the possibility exists that the outputs could be inadvertently connected to voltages higher than 15V, then it is recommended that external protection be provided. For protection against
voltages exceeding 15V, two back-to-back zener diodes connected from each output to ground will clamp the outputs to an acceptable voltage level. Shutdown (ON/OFF) The SP385A has a shut-down/standby mode to conserve power in battery-powered systems. To activate the shutdown mode, which stops the operation of the charge pump, a logic "0" is applied to the appropriate control line. The shutdown mode is controlled on the SP385A by a logic "0" on the ON/OFF control line (pin 18 for the SOIC and pin 20 for the SSOP packages); this puts the transmitter outputs in a tri-state mode.
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
6
PACKAGE:
PLASTIC SMALL OUTLINE (SOIC) (WIDE)
E
H
D A O e B A1 L
DIMENSIONS (Inches) Minimum/Maximum (mm) A A1 B D E e H L O
18-PIN 0.093/0.104 (2.352/2.649) 0.004/0.012 (0.102/0.300) 0.013/0.020 (0.330/0.508) 0.447/0.463 (11.35/11.74) 0.291/0.299 (7.402/7.600) 0.050 BSC (1.270 BSC) 0.394/0.419 (10.00/10.64) 0.016/0.050 (0.406/1.270) 0/8 (0/8)
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
7
PACKAGE:
PLASTIC SHRINK SMALL OUTLINE (SSOP)
E
H
D A O e B A1 L
DIMENSIONS (Inches) Minimum/Maximum (mm) A A1 B D E e H L O
20-PIN 0.068/0.078 (1.73/1.99) 0.002/0.008 (0.05/0.21) 0.010/0.015 (0.25/0.38) 0.278/0.289 (7.07/7.33) 0.205/0.212 (5.20/5.38) 0.026 BSC (0.65 BSC) 0.301/0.311 (7.65/7.90) 0.022/0.037 (0.55/0.95) 0/8 (0/8)
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
8
ORDERING INFORMATION
Model ....................................................................................... Temperature Range ................................................................................ Package SP385ACA ..................................................................................... 0C to +70C ............................................................................... 20-pin SSOP SP385AEA ................................................................................... -40C to +85C ............................................................................. 20-pin SSOP SP385ACT ..................................................................................... 0C to +70C ................................................................................ 18-pin SOIC SP385AET ................................................................................... -40C to +85C .............................................................................. 18-pin SOIC CT and ET packages available Tape-on-Reel. Please consult the factory for pricing and availability for this option, and for parts screened to MIL-STD-883.
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: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Far East: JAPAN: Nippon Sipex Corporation Yahagi No. 2 Building 3-5-3 Uchikanda, Chiyoda-ku Tokyo 101 TEL: 81.3.3256.0577 FAX: 81.3.3256.0621
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 hereing; neither does it convey any license under its patent rights nor the rights of others.
SP385ADS/05
SP385A Line Driver/Receiver
(c) Copyright 2000 Sipex Corporation
9

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