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STC International Limited
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STC232E
High ESD-Protected, Fail-Safe , Single Supply RS-232 Transceivers
General Description
The STC232E is low power single supply RS232 interface. The device consists of two line drivers, two line receivers, and dual charge pump circuit. The device meets the requirements of TIA/EIA-232 standard and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The on chip charge pump and four small external capacitors act as onboard DC to DC converter, allow chip operated from single 5V supply, eliminating the need for 10V power supplies, reduce cost and board space. Chip power supply current is specified at 8.0 mA maximum, making the device ideal for battery and power conscious applications. The device operates at data signaling rates over 120Kb/s. The slew rate of driver is set internally less than 30V/ and s the receivers feature internal noise filtering, eliminating the need for external slew rate and filter capacitors for reliable operation. The driver inputs and receiver outputs are TTL and CMOS compatible. STC232E comes in 16 pin DIP, SOP and SSOP packages, operating over the commercial and industrial temperature ranges. The ESD tolerance has been upgraded on these devices to over 15KV for both Human Body Model and IEC1000-4-2 Air Discharge Method, without latchup. These devices are pin-to-pin compatible with MAX202/232 devices as well as other popular industry standards.
Applications
Notebook, Subnotebook, and Palmtop Computers Battery-Powered Equipment Hand-Held Equipment POS terminal
Features
ESD Protection for RS-232 Bus Pins up to 15kV Human Body Model Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU V.28 Standards Single +5V power supply Low power, ICC 8.0mA maximum Operates up to 120 Kbit/s BiCMOS Technology Receiver Noise Filter Latch-Up Performance Exceeds 200mA Pin compatible with industry standard MAX232, ICL232
Ordering Information
PART STC232EESE STC232EEPE TEMP. RANGE -40 to +85 C C -40 to +85 C C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO
STC232E Datasheet Rev.0.1, Dec.2005
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STC International Limited Absolute Maximum Ratings
VCC... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -0.3V to +6V V+ ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... (VCC - 0.3V) to +14V V- ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -14V to +0.3V Input Voltages T_IN... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -0.3V to (V+ + 0.3V) R_IN... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 30V Output Voltages T_OUT... ... ... ... ... ... ... ... ... ... ... ... ... (V- - 0.3V) to (V+ + 0.3V) R_OUT... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -0.3V to (VCC + 0.3V)
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Short-Circuit Duration, T_OUT... ... ... ... ... ... ... ... ... ... ... ... Continuous Continuous Power Dissipation (TA = +70 C) 16-Pin Plastic DIP (derate 10.53mW/ above +70 ... ... 842mW C C) 16-Pin Narrow SO (derate 8.70mW/ above +70 ... ... 696mW C C) Operating Temperature Ranges STC232E... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... -40 to +85 C C Storage Temperature Range... ... ... ... ... ... ... ... ... -65 to +165 C C Lead Temperature (soldering, 10sec) ... ... ... ... ... ... ... ... ... +300 C
Stresses beyond those listed under " Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VCC = +5V 10% for STC232E; C1 = 0.1 TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25 C4 F; C.)
PARAMETER DC CHARACTERISTICS VCC Supply Current LOGIC Input Leakage Current Input Threshold Low Input Threshold High Output Voltage Low
SYMBOL ICC
CONDITIONS No load, TA = +25 C STC232E
MIN
TYP 6
MAX 8 10 0.8
UNITS mA A V V V V A V V
VIL VIH VOL
T_IN = 0V to VCC T_IN T_IN R_OUT; IOUT = 3.2mA R_OUT; IOUT = -1.0mA 0V = ROUT = VCC
2.0 0.4 3.5 V CC-0.4 0.05 10 30 1.2 1.7 0.2 3 5 300 10 60 0.5 5 9 2.4 1.0 7
Output Voltage High VOH Output Leakage Current EIA/TIA-232E RECEIVER INPUTS Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance EIA/TIA-232E TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output Short-Circuit Current TIMING CHARACTERISTICS Maximum Data Rate
-30 TA = +25 VCC = 5V C, TA = +25 VCC = 5V C, Normal operation Normal operation 0.8
V V k? V ? mA kbps
VCC = 5V TA = +25 VCC = 5V C, All drivers loaded with 3k? to ground (Note 1) VCC = V+ = V- = 0V, VOUT = 2V
RL = 3k? to 7k? , CL = 50pF to 1000pF, 120 one transmitter switching All parts, normal Receiver Propagation Delay tPLHR, tPHLR CL = 150pF operation RL = 3k? , CL = 2500pF, Transmitter Propagation Delay tPLHT, tPHLT all transmitters loaded TA = +25 VCC = 5V, RL = 3k? to 7k? , C, Transition-Region Slew Rate CL = 50pF to 1000pF, measured from 3 -3V to +3V or +3V to -3V, Figure 1 ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS Human Body Model ESD-Protection Voltage IEC1000-4-2, Contact Discharge IEC1000-4-2, Air-Gap Discharge
STC232E Datasheet Rev.0.1, Dec.2005
0.5 2 6
10
s s
30
V/ s
15 8 15
Page 2 of
kV
6
STC International Limited
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Pin Configurations
C1+1 V+ 2 C1- 3 C2+4 C2- 5 V- 6 T2 7 OUT R2 8 IN DIP/SO STC232E 16 Vcc 15 GND 14 T1 OUT 13 R1 IN 12 R1 OUT 11 T1 IN 10 T2 IN 9 R2 OUT
Pin Descriptions
PIN DIP/SO/SSOP 1,3 2 4,5 6 7,14 8,13 9,12 10,11 15 16 NAME C1+, C1V+ C2+, C2VT_OUT R_IN R_OUT T_IN GND VCC FUNCTION Terminals for positive charge-pump capacitor +2VCC voltage generated by the charge pump Terminals for negative charge-pump capacitor -2VCC voltage generated by the charge pump RS-232 Driver Outputs RS-232 Receiver Inputs RS-232 Receiver Outputs RS-232 Driver Inputs Ground +4.5V to +5.5V Supply-Voltage Input
Typical Operating Characteristics
TRANSMITTER OUTPUT VOLTAGE vs.LOAD CAPACITANCE 8.0 7.5 VOH VOLV (c) 7.0 6.5 6.0 5.5 Vcc=4.5V 5.0 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (c) pF Vcc=5.5V Vcc=5.0V TRANSMITTER SLEW RATE vs.LOAD CAPACITANCE SLEW RATE(V/uS) ALL TRANSMITTERS LOADED DATA RATE=120Kbps R L | =3k 14 ALL TRANSMITTERS LOADED DATA RATE=120Kbps 12 R L | =3k 10 8 6 4 2 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (c) pF +SLEW RATE -SLEW RATE
STC232E Datasheet Rev.0.1, Dec.2005
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STC International Limited Test Circuits
+5V 0.1uF
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+
C1+ C1+ Vcc V+
+
+5V 0.1uF
+
+
+ 0.1uF
STC232E
0.1uF V-
0.1uF
+
C1+ C1-
Vcc
V+ 0.1uF V-
+
+ 0.1uF
STC232E Vcc 400K T_ R_
+
0.1uF
C2+ Vcc C2-
C2+ C2-
400K T_ R_ T_OUT R_IN 5K 3K 2500pF
T_IN R_OUT
T_IN R_OUT
T_OUT R_IN 5K 7K 50pF
MINIMUN SLEW-RATE TEST CIRCUIT
MAXIMUM SLEW-RATE TEST CIRCUIT
TRANSMITTER INPUT PULL-UP RESISTORS
Figure 1. Transition Slew-Rate Circuit
Detailed Description
The STC232E consists of three sections: charge-pump voltage converters, drivers, and receivers. These E versions provide extra protection against ESD. They survive 15kV discharges to the RS-232 inputs and outputs, tested using the Human Body Model. When tested according to IEC1000-4-2, they survive 8kV contact-discharges and 15kV air-gap discharges. The rugged E versions are intended for use in harsh environments or applications where the RS-232 connection is frequently changed. The STC232E devices have internal charge pump voltage converters which allow them to operate from a single +5V supply. The charge pumps will operate with polarized or non-polarized capacitors ranging from 0.1 to 10 and will generate the needed to generate the RS-232 output levels. F 9V
Capacitor Selection
The capacitor type used for C1- is not critical for proper operation. The STC232E require 0.1 capacitors, although C4 F capacitors up to 10 can be used without harm. Ceramic dielectrics are suggested for the 0.1 capacitors. When F F using the minimum recommended capacitor values. If in doubt, use capacitors with a large (e.g.,2X) nominal value. The effective series resistance (ESR) of capacitors, which usually rises at low temperatures, influences the amount of ripple on V+ and V-. Use larger capacitors (up to 10 X) to reduce the output impedance at V+ and V-. Bypass VCC to ground with at least 0.1 In applications sensitive to power-supply noise generated by the charge pumps, decouple VCC to F. ground with a capacitor the same size as (or larger than) the charge-pump capacitors (C1- C4).
RS-232 Drivers
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. Even under worst case loading conditions of 3kO and 2500pF, the output is guaranteed to be 5V, which is consistent with the RS-232 standard specifications. 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/ in order to s meet the standards [EIA RS-232-D 2.1.7, Paragraph (5)]. However, the transition region slew rate of these enhanced products is typically 10V/ The smooth transition of the loaded output from VOL to VOH clearly meets the s. monotonicity requirements of the standard [EIA RS-232-D 2.1.7, Paragraphs (1) & (2)].
STC232E Datasheet Rev.0.1, Dec.2005 Page 4 of 6
STC International Limited
http://www.mcu-memory.com
RS-232 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 voltage up to 25V. Should an input be left unconnected, a 5kO 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 the receiver circuitry. This occurs, for example, when a PC user attempts to print, only to realize the printer wasn' turned on. In this case an RS-232 signal from the PC will appear on the receiver input t at the printer. When the printer power is turned on, the receiver will operate normally. All of these enhanced devices are fully protected.
ESD Protection
STC232E devices have standard ESD protection structures incorporated on the pins to protect against electrostatic discharges encountered during assembly and handling. In addition, the RS232 bus pins (driver outputs and receiver input) of these devices have an extra level of ESD protection. Advanced ESD structures were designed to successfully protect these pins against ESD discharge of 15kV when powered down.
Pin Configurations and Typical Operating Circuits
+5V INPUT TOP VIEW C5 + C3 +
C1+ 1 V+2 C1-3 C2+ STC232E 4 C2-5 V- 6 T2 UT O7 R2N 8 I DIP/SO
16Vcc 15GND 14T1 UT O 13R1N I 12R1 UT O 11T1N I 10V2 IN 9 R2 UT O
1 C1 +
C1+
C2
3 C14 6 + C2+ +10V TO -10V V5 C2VOLTAGE INVERTER + +5V
16 Vcc 2 +10V V+ +5V TO +10V VOLTAGE DOUBLER -10V C4
400K | 11 T1IN TTL/CMOS INPUTS +5V 400K | 10 T2IN 12 R1OUT TTL/CMOS OUTPUTS 9 R2OUT
T1OUT14 RS-232 OUTPUTS T2OUT7
R1IN 13 5K| R2IN 8 5K| GND 15 RS-232 INPUTS
STC232E Datasheet Rev.0.1, Dec.2005
Page 5 of
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STC International Limited Package Information Physical Dimensions
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Inches (millimeters)unless otherwise noted 0.386-0.394 (9.804-10.00) 16151413121110 9 0.228-0.244 (5.791-6.198) LEAD NO.11 2 3 4 5 6 7 8 IDENT 30 a TYP 0.010 MAX 0.254
0.150-0.157 (3.810-3.988) 0.053-0.069 0.010-0.020a A 45 (0.254-0.508) 8 MAX TYP(1.345-1.753) a ALL LEADS 0.008-0.010 (0.203-0.254) TYP ALL LEADS 0.014 0.016-0.050 (0.406-1.270) (0.356) TYP ALL LEADS
0.004-0.010 (0.102-0.254) SENTING PLANE 0.050 0.014-0.020 TYP (1.270) (0.356-0.508) TYP 0.008 TYP (0.203)
0.740-0.780 (18.80-19.81) 16 15 14 13 12 11 10 9 PIN NO.1 2 3 4 5 6 7 8 IDENT 1 OPTION 01 0.130 A 0.005 0.060 TYP (3.302 A 0.127) (1.524) 0.145-0.200 (3.683-5.080) 0.020 MIN (0.508) 0.125-0.150 (3.175-3.810) 0.014-0.023 (0.356-0.584) TYP
INDEX 16 15 14 13 12 11 10 9 AREA 0.250 A 0.010 (6.350 A 0.254) PIN NO.1 2 3 4 5 6 7 8 IDENT 1 OPTION 02 0.065 4 TYP a 0.300-0.320 (1.651) OPTIONAL (7.620-8.128)
0.090 (2.286)
0.050 A 0.010 (1.270 A 0.254) TYP
90 aA 4 TYP a 0.030 A 0.015 (0.762 A 0.381) 0.100 A 0.010 (2.540 A 0.254) TYP
95 aA 5 a 0.008-0.016 TYP (0.203-0.406) 0.280 (7.112) MIN +0.040 0.325 -0.015 +1.016 N1RE(REV F) 8.255 -0.381
STC232E Datasheet Rev.0.1, Dec.2005
Page 6 of
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