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Preliminary Technical Data
FEATURES
460 kbps Data Rate 1 Tx and 1 Rx Meets EIA-232E specifications 0.1uF charge pump capacitors Integrated isolated dc-to-dc converter ESD protection to IEC1000-4-2(801.2) on RIN and TOUT pins. 8kV: contact discharge 15kV: air gap discharge Integrated isolated dc-to-dc converter High common-mode transient immunity: >25kV/us Safety and regulatory approvals (pending) UL recognition VDE certificate of conformity 20 Lead WSOIC package
Isolated Single Channel RS-232 Line Driver/Receiver ADM3251E
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
High noise data communications Industrial Communications Industrial/Telecom Diagnostic Ports
Figure 1.
GENERAL DESCRIPTION
The ADM3251E is a high speed, single-channel RS-232 transceiver device that operates from a single power supply. This device is ideally suited to operation in electrically harsh environments or where RS-232 cables are frequently being plugged/unplugged. The ADM3251E incorporates dual-channel digital isolators with isoPower integrated, isolated power. There is no requirement for a separate isolated dc-to-dc converter as the ADM3251E has a chip-scale dc-to-dc converter which is based on Analog Devices, Inc. iCoupler(R) technology. Analog Devices' chip-scale transformer iCoupler technology is used both for the isolation of the logic signals as well as for the dc-to-dc converter. The result is a small form factor, total isolation solution. Five external 0.1F charge pump capacitors are used for the voltage doubler/inverter permitting operation from a single supply. The ADM3251E conforms to the EIA-232E specifications and operates at data rates up to 460 kbps. The device is ideally suited to operation in electrically harsh environments. RS-232 pins, RIN and TOUT are protected against electrostatic discharges (up to 15 kV ESD protection). The ADM3251E is available in a 20 lead Wide Body SOIC package.
Rev. PrA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
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ADM3251E TARGET SPECIFICATIONS
Preliminary Technical Data
All voltages are relative to their respective ground. All min/max specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications in Table 1 are at TA = 25C, VCC = 5.0V, unless otherwise noted.
Table 1.
Parameter
DC CHARACTERISTICS VCC Operating Voltage Range DC-to-DC Converter Enable Threshold, VCC(Enable) 1 DC-to-DC Converter Disable Threshold, VCC(Disable) 1 DC-to-DC CONVERTER ENABLED Input Supply Current VISO Output2 DC-to-DC CONVERTER DISABLED Primary Side Supply Input Current, ICC(Disable) LOGIC Transmitter Input, TIN Logic Input Current, ITIN Logic Low Input Threshold, VTINL Logic High Input Threshold, VTINH Receiver Output, ROUT Logic High Output VROUTH Logic Low Output VROUTL RS-232 RECEIVER EIA-232 Input Voltage Range 3 EIA-232 Input Threshold Low EIA-232 Input Threshold High EIA-232 Input Hysteresis EIA-232 Input Resistance TRANSMITTER Output Voltage Swing (RS-232) Transmitter Output Resistance RS-232 Output Short Circuit Current TIMING CHARACTERISTICS Maximum Data Rate Receiver Propagation Delay tPHL tPLH Transmitter Propagation Delay Transmitter Skew Receiver Skew Transition Region Slew Rate3 AC SPECIFICATIONS Output Rise, tR/Fall time, tF (10% to 90%) Common-Mode Transient Immunity at Logic High Output Common-Mode Transient Immunity at Logic Low Output ESD PROTECTION (RIN and TOUT Pins)
Min
4.5 4.5
Typ
Max
5.5 3.7 TBD TBD
Unit
V V V mA mA V mA
Test Conditions/Comments
5.0 TBD
No Load RL = 3k IISO =0uA VISO = 3.3V, Vcc 3.7V
-10 0.3 VCC
+0.01
+10 0.7 VCC
A V V V V V V IROUTH= - 20 A IROUTH = - 4 mA IROUTH = 20 A IROUTH = 4 mA
VCC - 0.1 VCC - 0.5
VCC VCC - 0.2 0.0 0.0
0.1 0.4
-30 0.6
+30 1.3 1.6 0.4 5 5.7 TBD 2.4 7
3 5 300
V V V V k V mA kbps RL = 3k to Gnd VISO = 0V
460 190 135 650 80 70 10
RL = 3k to7k, CL=50 pF to 1000 pF
5.5
30
s s s ns ns V/s
RL = 3k, CL=1000 pF
+3V to -3V or -3V t0 3V, Vcc =+3.3V, RL=+3k, CL=1000pF, TA=25C. CL = 15 pF, CMOS signal levels
2.3 TBD TBD 15 8
ns KV/ s KV/ s kV kV
Human Body Model Air Discharge Human Body Model Contact Discharge
1 Enable/disable threshold is the VCC voltage at which the internal DC-to-DC converter is enabled/disabled. 2 To maintain datasheet specifications no current should be drawn from VISO. 3 Guaranteed by design
Rev. PrA | Page 2 of 6
Preliminary Technical Data TARGET SPECIFICATIONS
ADM3251E
All voltages are relative to their respective ground. All min/max specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications in Table 2 are at TA = 25C, VCC = 3.3V (DC-to-DC converter disabled), the secondary side is powered externally by VISO=3.3V, unless otherwise noted.
Table 2.
Parameter
DC CHARACTERISTICS VCC Operating Voltage Range DC-to-DC Converter Disable Threshold, VCC(Disable) 1 DC-to-DC CONVERTER DISABLED VISO Primary Side Supply Input Current, ICC(Disable) Secondary Side Supply Input Current, IISO(Disable) LOGIC Transmitter Input, TIN Logic Input Current, ITIN Logic Low Input Threshold, VTINL Logic High Input Threshold, VTINH Receiver Output, ROUT Logic High Output VROUTH Logic Low Output VROUTL RS-232 RECEIVER EIA-232 Input Voltage Range 2 EIA-232 Input Threshold Low EIA-232 Input Threshold High EIA-232 Input Hysteresis EIA-232 Input Resistance TRANSMITTER Output Voltage Swing (RS-232) Transmitter Output Resistance RS-232 Output Short Circuit Current TIMING CHARACTERISTICS Maximum Data Rate Receiver Propagation Delay tPHL tPLH Transmitter Propagation Delay Transmitter Skew Receiver Skew Transition Region Slew Rate2 AC SPECIFICATIONS Output Rise, tR/Fall time, tF (10% to 90%) Common-Mode Transient Immunity at Logic High Output Common-Mode Transient Immunity at Logic Low Output ESD PROTECTION (RIN and TOUT Pins)
Min
3.0
Typ
Max
3.7 3.7 5.5 TBD TBD
Unit
V V V mA mA
Test Conditions/Comments
3.0
No Load RL=3k
-10 0.3 VCC
+0.01
+10 0.7 VCC
A V V V V V V IROUTH= - 20 A IROUTH = - 4 mA IROUTH = 20 A IROUTH = 4 mA
VCC - 0.1 VCC - 0.5
VCC VCC - 0.2 0.0 0.0
0.1 0.4
-30 0.6
+30 1.3 1.6 0.4 5 5.7 TBD 2.4 7
3 5 300
V V V V k V mA kbps VISO = 3.3V, RL = 3k to Gnd VISO = 0V
460
VISO = 3.3V, RL = 3k to7k, CL=50 pF to 1000pF
5.5
190 135 650 80 55 10
30
s s s ns ns V/s
RL = 3k, CL=1000 pF
+3V to -3V, or -3V to +3V, Vcc = 3.3V, RL=3k, CL=1000pF, TA=25C. CL = 15 pF, CMOS signal levels
2.3 TBD TBD 15 8
ns KV/ s KV/ s kV kV
Human Body Model Air Discharge Human Body Model Contact Discharge
1 Enable/disable threshold is the VCC voltage at which the internal DC-to-DC converter is enabled/disabled. 2 Guaranteed by design
:
Rev. PrA | Page 3 of 6
ADM3251E ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter VCC V+ V- Input Voltages TIN RIN Output Voltages TOUT ROUT Short Circuit Duration TOUT Power Dissipation Power dissipation CP-12 JA, Thermal Impedance Operating Temperature Range Industrial Storage Temperature Range Pb-Free Temperature (Soldering, 30 sec) Rating -0.3 V to +6 V (VCC - 0.3 V) to +13 V +0.3 V to -13 V -0.3 V to (V+, +0.3 V) 30 V 15 V -0.3 V to (VCC + 0.3 V) Continuous TBD TBD -40C to +85C -65C to +150C 260C
Preliminary Technical Data
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
Rev. PrA | Page 4 of 6
Preliminary Technical Data PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADM3251E
Figure 2. ADM3251E Pin Configuration
Table 7. Pin Function Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Mneumonic NC Vcc Vcc GND GND GND GND ROUT TIN GND GNDISO VC2C2+ RIN TOUT C1C1+ V+ VISO Description Not Connected Power Supply Input Power Supply Input Ground Pin Ground Pin Ground Pin Ground Pin Receiver Output. This outputs CMOS output logic levels. Transmitter (Driver) Input. This input accepts TTL/CMOS levels. Ground Pin Ground reference for Isolator Primary Side. Internally Generated Negative Supply External Capacitor 2 is connected between pins 13 and 14. A 0.1F capacitor is recommended but larger capacitors up to 47uF may be used. External Capacitor 2 is connected between pins 13 and 14. A 0.1F capacitor is recommended but larger capacitors up to 47uF may be used. Receiver Input. This input accepts RS-232 signal levels. Transmitter (Driver) Output. This outputs RS-232 signal levels. External Capacitor 1 is connected between pins 17 and 18. A 0.1F capacitor is recommended but larger capacitors up to 47uF may be used. External Capacitor 1 is connected between pins 17 and 18. A 0.1F capacitor is recommended but larger capacitors up to 47uF may be used. Internally Generated Positive Supply Isolated Supply Voltage for Isolator Secondary Side.
Rev. PrA | Page 5 of 6
ADM3251E OUTLINE DIMENSIONS
13.00 (0.5118) 12.60 (0.4961)
20 11
Preliminary Technical Data
7.60 (0.2992) 7.40 (0.2913)
1 10
10.65 (0.4193) 10.00 (0.3937)
0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 1.27 (0.0500) BSC 0.51 (0.0201) 0.31 (0.0122)
2.65 (0.1043) 2.35 (0.0925)
0.75 (0.0295) 0.25 (0.0098)
8 0
45
SEATING PLANE
0.33 (0.0130) 0.20 (0.0079)
1.27 (0.0500) 0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-013-AC CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 5. 20-Lead Standard Small Outline Package. Dimensions shown in millimeters and (inches).
060706-A
Rev. PrA | Page 6 of 6
PR07388-0-2/08(PrA)

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