ZT3232LEEN

ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers Datasheet Revision 2.20 August 30th, 2019 ASIX ELECTRONICS CORPORATION 4F, NO.8, Hsin Ann Rd., Hsinchu Science Park, Hsin-Chu City, Taiwan, R.O.C. 300 TEL: +886-2-22181884 FAX: +886-2-22181840 Email: zywyn@asix.com.tw Released Date: 08/30/2019 http://www.asix.com.tw/ ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers IMPORTANT NOTICE Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. DISCLAIMER No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose, without the express written permission of ASIX. ASIX may make changes to the product specifications and descriptions in this document at any time, without notice. ASIX provides this document “as is” without warranty of any kind, either expressed or implied, including without limitation warranties of merchantability, fitness for a particular purpose, and non-infringement. Designers must not rely on the absence or characteristics of any features or registers marked “reserved”, “undefined” or “NC”. ASIX reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. Always contact ASIX to get the latest document before starting a design of ASIX products. TRADEMARKS ASIX, the ASIX logo are registered trademarks of ASIX Electronics Corporation. All other trademarks are the property of their respective owners. 2 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers Features General Description • The ZT32xxE series devices are 3V powered EIA/TIA-232 and V.28/V.24 communication interfaces with low power requirements. They consist of two line drivers, two line receivers and the proprietary switch-capacitor regulated voltage converters. The ZT3220E has a 1Tx and 1Rx configuration. These devices operate from a single 3V to 5.5V power supply at the guaranteed data rate of 250K bits/sec with enhanced electrostatic discharge (ESD) protection in all RS232 I/O pins exceeding ±15KV EN61000-4-2 Air Gap Discharge and ±8KV EN61000-4-2 Contact Discharge. • • • • • • • • • Meets EIA/TIA-232F and CCITT V.28/V.24 specifications for VCC at +3.3V ±10% and +5V ±10% Low Quiescent Current: 0.5mA typ., 1mA max. Low Shutdown Current (where applicable): 1μA typical, 10μA max. Guaranteed Data Rate 250Kbps Proprietary Switch-Capacitor Regulated Voltage Converters (patent pending) Proprietary AUTOGREEN Power Saving (patent pending) Latch-up Free ESD Protection for RS-232 I/O's ±15KV Human Body Model (HBM) ±15KV EN61000-4-2 Air Gap Discharge ±8KV EN61000-4-2 Contact Discharge Drop-in Replacements for MAX3220E, SP3220E, MAX3221E, ICL3221E, MAX3222E, ICL3222E, SP3222E, MAX3223E, ICL3223E, SP3223E, MAX3232E, ICL3232E, SP3232E, LT1385, SP385E, IS3232E High Data Rate at 1000Kbps Available on ZT32xxF Series The ZT3221E and ZT3223E features the AUTOGREEN (patent pending) proprietary function which automatically powers down the on-chip regulated voltage converters and driver circuits when an RS-232 cable is disconnected from the host interface or when a connected peripheral device is turned off. Applications • • • • • • • Battery-Powered And Hand-Held Applications Notebooks, Subnotebooks, and Palmtops Industrial and Embedded PCs Data Cables for Cell Phones and PDAs Terminal Adapters and POS terminals Peripherals interface Routers and HUBs Product Selection Guide and Cross Reference Part Number Power Supply ZT3220E ZT3221E ZT3222E +3V to +5.5V +3V to +5.5V +3V to +5.5V 1 1 2 1 1 2 250 250 250 RS232 I/O RS232 I/O RS232 I/O YES YES YES YES YES YES NO YES NO 16 16 18, 20 ZT3232E +3V to +5.5V 2 2 250 RS232 I/O NO NO NO 16 ZT3223E +3V to +5.5V 2 2 250 RS232 I/O YES YES YES 20 ZT1385E +3V to +5.5V 2 2 250 RS232 I/O NO YES NO 18, 20 RS232 RS232 Data Rate 15KV ESD Receiver SHUTDOWN AUTOGREEN Enable Function Drivers Receivers (Kbps) IEC1000 4-2 Enable 3 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. Number Package Type of Pins SSOP, TSSOP, WSOIC SSOP, TSSOP 18-WSOIC 20-SSOP, 20-TSSOP, NSOIC, WSOIC, SSOP, TSSOP, QFN SSOP, TSSOP 18-WSOIC, 20-SSOP ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers Storage Considerations Absolute Maximum Ratings These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Power Supply, (VCC) ....................................–0.3V to +6.0V V+ ............................................................... –0.3V to +7.0V V– ................................................................+0.3V to –7.0V |V+| + |V-| .............................................................. +13.0V ICC (DC VCC or GND current) .................................±100mA Input Voltages ̅̅̅̅̅̅̅̅̅, SHUTDOWN ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅, EN ̅̅̅̅ ......................–0.3V to +6.0V TxIN,GREEN RxIN ............................................................................ ±25V Storage in a low humidity environment is preferred. Large high density plastic packages are moisture sensitive and should be stored in Dry Vapor Barrier Bags. Prior to usage, the parts should remain bagged and stored below 40°C and 60%RH. If the parts are removed from the bag, they should be used within 168 hours or stored in an environment at or below 20%RH. If the above conditions cannot be followed, the parts should be baked for 12 hours at 125°C in order to remove moisture prior to soldering. ASIX ships product in Dry Vapor Barrier Bags with a humidity indicator card and desiccant pack. The humidity indicator should be below 30%RH. The MSL of this product is 3. The information furnished by ASIX has been carefully reviewed for accuracy and reliability. Its application or use, however, is solely the responsibility of the user. No responsibility of the use of this information become part of the terms and conditions of any subsequent sales agreement with ASIX. Specifications are subject to change without the responsibility for any infringement of patents or other rights of third parties which may result from its use. No license or proprietary rights are granted by implication or otherwise under any patent or patent rights of ASIX Electronics Corporation. Output Voltages TxOUT ........................................................................ ±15V RxOUT, ̅̅̅̅̅̅̅ IDLE ..................................... –0.3V to (VCC +0.3V) Short-Circuit Duration TxOUT ...............................................................Continuous Operating Temperature ...............................–40°C to +85°C Storage Temperature ................................–65°C to +150°C Power Dissipation Per Package 16-pin SSOP (derate 7.20mW/°C above +70°C) ….584mW 16-pin nSOIC (derate 10.00mW/°C above +70°C) ..720mW 16-pin WSOIC (derate 10.10mW/°C above +70°C) ..787mW 16-pin TSSOP (derate 6.80mW/°C above +70°C) ..556mW 16-pin PDIP (derate 11.20mW/°C above +70°C) ….896mW 16-pin QFN (derate 24mW/°C above +70°C) ...............2W 18-pin PDIP (derate 12.60mW/°C above +70°C) ….962mW 18-pin WSOIC (derate 11.10mW/°C above +70°C) .850mW 4 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 1 Electrical Characteristics Unless otherwise stated, VCC = +3.0V to +5.0V, TA = Tmin to Tmax, C1 to C4 = 0.1μF, typical values apply at VCC = +3.3V or +5.0V and TA = 25°C. Parameter TTL Logic Input TTL Logic Output RS-232 Input RS-232 Output Charge Pump Pin Power Pin Charge Pump Caps Temp 0°C to +70°C Temp –40°C to +85°C VCC Voltage Range Supply Current Supply Current, AUTOGREEN Disabled Condition ̅̅̅̅̅̅̅̅̅, ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ T1IN, T2IN, GREEN SHUTDOWN, ̅̅̅̅ EN R1OUT, R2OUT, ̅̅̅̅̅̅̅ IDLE R1IN, R2IN T1OUT, T2OUT C1P, C1N, C2P, C2N VCC, VGND, VDD, VSS C1P, C1N, C2P, C2N Commercial Grade Industrial Grade VCC = +5.0V Supply VCC = +3.3V Supply TTL Inputs = VCC/GND, RS-232 Input = float, VCC = 3.3V (For ZT3220E, ZT3222E, ZT3232E and ZT1385E) ̅̅̅̅̅̅̅̅̅ = VCC, (For ZT3221E and ZT3223E); GREEN ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ = VCC, (For ZT3221E, ZT3222E, ZT1385E SHUTDOWN and ZT3223E), Min Typ Max Units 0.1 0 –40 4.5 3 0.1 +25 +25 5 3.3 0.5 1 +70 +85 5.5 3.6 1 μF °C °C V V mA 0.5 1 mA 1 10 μA 1 10 μA 0.8 V V V V μA μA TTL Inputs = VCC/GND, RS-232 Input = float, VCC = 3.3V Supply Current, AUTOGREEN Enabled ̅̅̅̅̅̅̅̅̅ = GND, (For ZT3221E and ZT3223E); GREEN ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ SHUTDOWN = VCC, (For ZT3221E, ZT3222E, ZT1385E and ZT3223E), TTL Inputs = VCC/GND, RS-232 Input = float, VCC = 3.3V Supply Current, SHUTDOWN Enabled ̅̅̅̅̅̅̅̅̅ = VCC/GND, (For ZT3221E and ZT3223E); GREEN ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ = GND, (For ZT3221E, ZT3222E, SHUTDOWN ZT1385E and ZT3223E), TTL Inputs = VCC/GND, RS-232 Inputs = float, VCC = 3.3V TTL LOGIC Input Input Threshold Low Input Threshold High Input Threshold High Input Hysteresis Input Leakage Current Input Leakage Current TTL LOGIC Output Output Voltage Low Output Voltage High Output Leakage Current Receiver Input Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance Transmitter Output Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current VCC = +5.0V Supply VCC = +3.3V Supply 2.4 2 0.5 ±0.01 50 ̅̅̅̅̅̅̅̅̅, SHUTDOWN ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ ̅̅̅̅, GREEN VIN = VCC and GND, TIN, EN VIN = VCC and GND, TIN (For ZT1385E) IOUT = 1.6mA IOUT = –1.0mA Receiver Outputs Disabled, VOUT = VCC or GND, ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ = GND, EN ̅̅̅̅ = VCC SHUTDOWN 0.4 V V ±10 μA 25 V V V V V KΩ VCC –0.6 VCC –0.1 ±0.05 –25 0.8 0.6 TA = Tmin – Tmax TA = 25°C, VCC = 5.0V TA = 25°C, VCC = 3.3V TA = 25°C TA = 25°C VIN = ±25V, TA = 25°C ±1 200 1.5 1.2 2.4 0.5 3 RL = 3KΩ, All Outputs are loaded VCC = VDD = VSS = GND, VOUT = ±2V VOUT = GND Transmitter Disabled, VOUT = ±12V 7 ±5 300 5 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ±60 ±5 V Ω mA μA ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers Parameter Condition Min Typ Max Units Maximum Data Rate Refers to Figure 1 and 2. RL = 3KΩ, CL = 1000pF, One Transmitter Switching, TA = 25°C 250 Transition-Region Slew Rate RL = 3~7KΩ, CL = 150pF to 1000pF, One Transmitter Switching, TA = 25°C, Measured from 3V to –3V or –3V to 3V Receiver Propagation tPLH Receiver Propagation tPHL Receiver Skew Receiver Output Enable Time Receiver Output Disable Time CL = 150pF CL = 150pF tPHL – tPLH For ZT3220E, ZT3221E, ZT3222E, ZT3223E only For ZT3220E, ZT3221E, ZT3222E, ZT3223E only 0.15 0.15 50 0.2 0.2 μs μs ns μs μs For ZT3221E and ZT3223E only For ZT3221E and ZT3223E only For ZT3221E and ZT3223E only 1 30 100 μs μs μs RS-232 Inputs and Outputs RS-232 Inputs and Outputs RS-232 Inputs and Outputs ±15 ±8 ±15 KV KV KV Timing Characteristics Kbps 6 30 V/μs AUTOGREEN Timing Receiver Input to IDLE Output High Receiver Input to IDLE Output Low Power Save Mode to Transmitter Enabled ESD Tolerance ESD HBM EN61000-4-2 Contact Discharge EN61000-4-2 Air Gap Discharge 6 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 2 Product Cross Reference Part Number Pin-to-Pin Cross MAXIM Pin-to-Pin Cross Intersil Pin-to-Pin Cross TI Pin-to-Pin Cross ST-M Pin-to-Pin Cross EXAR ZT3220E MAX3220E MAX3220 n/a MAX3220E n/a SP3220E ZT3221E MAX3221E MAX3221 ICL3221E ICL3221 MAX3221E MAX3221 n/a n/a ZT3222E MAX3222E MAX3222 ICL3222E ICL3222 MAX3222E MAX3222 ST3222E ST3222 SP3222E SP3222EB ZT3232E MAX3232E MAX3232 ICL3232E ICL3232 MAX3232E MAX3232 ST3232E ST3232 SP3232E SP3232EB ZT3223E MAX3223E MAX3223 ICL3223E ICL3223 MAX3223E MAX3223 n/a SP3223E SP3223EB ZT1385E n/a n/a LT1385 n/a SP385E 7 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 3 Pin Description ZT3220E/ZT3221E/ZT3222E/ZT3232E/ZT1385E/ZT3223E Pin Number ZT3220E ZT3221E 16 Pins 16 Pins ZT3222E 18 Pins ZT3232E 20 Pins 16 Pins* ZT1385E 18 Pins ZT3223E 20 Pins 20 Pins Pin Name Pin Description 1 1 1 1 – – – 1 ̅̅̅̅ EN 2 2 2 2 1 2 2 2 C1+ 3 3 3 3 2 3 3 3 V+ 4 4 4 4 3 4 4 4 C1- 5 5 5 5 4 5 5 5 C2+ 7 7 7 7 6 7 7 7 V- 6 6 6 6 5 6 6 6 C2- 8 8 14 16 13 14 16 16 R1 IN Receiver Enable. Logic low for Normal operation. Logic high to force the receiver outputs into high impedance state Positive terminal of the boostrapped voltage switch capacitor Regulated +5.4V output generated by the voltage converter Negative terminal of the boostrapped voltage switch capacitor Positive terminal of the inverted voltage switch capacitor Regulated –5.7V output generated by the voltage converter Negative terminal of the inverted voltage switch capacitor First RS232 receiver input – – 9 9 8 9 9 9 R2 IN Second RS232 receiver input 9 9 13 15 12 13 15 15 R1 OUT First TTL/CMOS receiver output – – 10 10 9 10 12 10 R2 OUT Second TTL/CMOS receiver output 11 11 12 13 11 12 14 13 T1 IN – – 11 12 10 11 13 12 T2 IN First TTL/CMOS transmitter input Second TTL/CMOS transmitter input 13 13 15 17 14 15 17 17 T1 OUT First RS232 transmitter output – – 8 8 7 8 8 8 Second RS232 transmitter output – 10 – – – – – 11 T2 OUT ̅̅̅̅̅̅̅ IDLE 16 16 18 20 – 18 20 20 – 12 – – – – – 14 14 14 16 18 15 16 18 18 15 15 17 19 16 17 19 19 TTL/CMOS output indicating AUTOGREEN or SHUTDOWN status ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ SHUTDOWN Shutdown control. A logic LOW to disable drivers and voltage converter A logic HIGH to override ̅̅̅̅̅̅̅̅̅ GREEN AUTO-GREEN circuitry keeping transmitters ON. (SHUTDOWN ̅must be HIGH) Ground GND +3V to +5.5V Supply Voltage VCC – NC No connect 10,12 – – 11,14 – 1 1,10,11 *Pin-outs for NSOIC, WSOIC, SSOP and TSSOP packages only. 8 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers ZT3232LEEQ (5x5 16-QFN Package) . Pin Number Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 C1C2+ C2VT2OUT R2IN R2OUT T2IN T1IN R1OUT R1IN T1OUT GND VCC C1+ V+ Pin Description Negative terminal of the boostrapped voltage switch capacitor Positive terminal of the inverted voltage switch capacitor Negative terminal of the boostrapped voltage switch capacitor . Regulated –5.7V output generated by the voltage converter Second RS232 transmitter output Second RS232 receiver input. Second TTL/CMOS receiver output. Second TTL/CMOS transmitter input. First TTL/CMOS transmitter input First TTL/CMOS receiver output. First RS232 receiver input. First RS232 transmitter output Ground. +3V to +5.5V Supply Voltage Positive terminal of the boostrapped voltage switch capacitor Regulated +5.4V output generated by the voltage onverter 9 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 4 Circuit Description Proprietary Switch-Capacitor Regulated Voltage Converter Different from other suppliers, ASIX uses a patent pending switch-capacitor voltage-controlled source and sink current generators design to provide powerful bipolar voltages to maintain compliant EIA/RS232 levels regardless of power supply fluctuations. The design consists of an internal regulated oscillator, a two phase clock cycling, regulated complementary MOS switches, fast switching diode and switch capacitors. The switch capacitor bi-directional current generators operate with ASIX’s proprietary smartly regulated complementary MOS switches and fast switching diode from its proprietary high voltage process technology. The efficiency of these bidirectional current generators is well over 70%. The switching frequency is generated by an internal oscillator and regulated by the current loads. The switch capacitor pump design delivers higher negative bucked voltage than the positive boosted voltage to achieve a balanced voltage controlled source and sink current generators resulting a balanced bipolar voltage supplies to the chip. With its unique proprietary design technique, ASIX’s interface product series provide a better power efficient, stable and compliant EIA/RS232 levels with superior low power consumption. Controlled Power-Down The ZT3220E, ZT3221E, ZT3222E, and ZT3223E have a low-power shutdown mode controlled by the ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ SHUTDOWN pin. During shutdown the driver output and the switch-capacitor regulated voltage converter are disabled with the supply current falls to less than 1μA. The ZT3221E and ZT3223E use ASIX’s patent pending ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ AUTOGREEN circuitry to set/reset latches, which enable the circuit shutdown function when a RS232 cable is disconnected or when the peripheral is turned off and reduce the power supply drain to a 1μA supply current. When a RS232 cable is connected or when the peripheral is enabled, the devices will automatically become active again. ESD Immunity Electro-Static Discharge (ESD) is an important factor when implementing a serial port into a system. In some applications, it is crucial that the ESD protection for the system must meet a certain tolerance level. Since RS232 transceiver devices are exposed to the outside world, there are many environmental factors that can affect the serial port and even subject it to transients that could potentially damage the transceiver itself. The RS232 transceiver is usually routed from the serial port connector to the transceiver IC through the metal trace on the printed circuit board. This trace will have some small amount of resistance that will add some protection in terms of limiting transient current to the IC. However for added voltage protection, transient voltage suppressors (TVS) or transzorbs, which are back-to-back diode arrays clamp, are usually necessary to protect the serial port circuity. To further reduce cost within their system, more engineers are requiring higher ESD tolerances from the transceiver ICs themselves without having to add costly TVS circuitry. ASIX's RS232 transceivers includes built-in transient voltage suppression where external ESD circuitry is not necessary to meet the MIL-STD883, Method 3015, Human Body Model and the EN61000-4-2 Air/Contact Discharge tests. 10 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers The Human Body Model has been the generally accepted ESD testing method for semiconductors. This test is intended to simulate the human body’s potential to store electrostatic energy and discharge it to an integrated circuit upon close proximity or contact. This method will test the IC’s capability to withstand an ESD transient during normal handling such as in manufacturing areas where the ICs tend to be handled frequently. EN61000-4-2 is used for testing ESD on equipment and systems. For system manufacturers, they must guarantee a certain amount of ESD protection since the system itself is exposed to the outside environment and human presence. EN61000-4-2 specifies that the system is required to withstand an amount of static electricity when ESD is applied to exposed metal points and surfaces of the equipment that are accessible to personnel during normal usage. The transceiver IC receives most of the ESD current when the ESD source is applied to the connector pins. There are two methods within EN61000-4-2, the Air Discharge method and the Contact Discharge method. With the Air Discharge Method, an ESD voltage is applied to the equipment under test through air, which simulates an electrically charged person ready to connect a cable onto the rear of the system and the high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. The Contact Discharge Method applies the ESD current directly to the EUT. This method was devised to reduce the unpredictability of the ESD arc. The discharge current rise time is constant since the energy is directly transferred without the air-gap arc inconsistencies. ASIX's RS232 transceivers meets and exceeds the minimum criteria for EN61000-4-2 with ±15KV for Air Gap Discharge and ±8KV for Contact Discharge. ̅̅̅̅̅̅̅̅̅ 𝐆𝐑𝐄𝐄𝐍 don’t care don’t care Shutdown don’t’ care don’t’ care 1 1 Normal without ̅̅̅̅̅̅̅̅̅ GREEN 1 1 0 0 ̅̅̅̅̅̅̅̅̅ Normal with GREEN 0 0 Table 1. ZT32xxE Truth Table Operation Status ̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅̅ 𝐒𝐇𝐔𝐓𝐃𝐎𝐖𝐍 0 0 0 0 1 1 1 1 1 1 1 1 ̅̅̅̅ 𝐄𝐍 0 0 1 1 0 0 1 1 0 0 1 1 Signal at RXIN present not present present not present present not present present not present present not present present not present ̅̅̅̅̅̅̅ 𝐈𝐃𝐋𝐄 1 0 1 0 1 0 1 0 1 0 1 0 11 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. TXOUT tri-state tri-state tri-state tri-state active active active active active tri-state active tri-state RXOUT active active tri-state tri-state active active tri-state tri-state active tri-state tri-state tri-state ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 5 Typical Application Circuits and Pin Configuration 12 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 13 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 14 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 15 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 16 Copyright © 2010-2019 ASIX Electronics Corporation. All rights reserved. ZT3220E/ZT3221E/ZT3222E/ ZT3223E/ZT3232E/ZT1385E Low Power 3V to 5.5V 250Kbps RS232 Transceivers 6 Typical Test Circuits Maximum Data Rate Test Circuit Notes: A. RL = 3KΩ , CL = 1000pF, TA = 25oC, One Driver Switching. B. The pulse generator had the following characteristics: PRR = 250 Kbps, Zo = 50Ω, 50% duty cycle, Tr & Tf