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ZT485E Low Power 5V 250kbps/10Mbps RS485 Transceivers
Zywyn Corporation
ZT4xxE
Zywyn
Features
* Meets or exceeds the requirements of ANSI Standard TIA/EIA-485-A and ISO 8482:1987(E) specifications for VCC at +5V 5% * Low quiescent current - 0.5mA typ., 1mA max. * Low shutdown current (where applicable) - 0.01A typical, 10A max. * Guaranteed standard data rate 250kbps or 10Mbps * Thermal shutdown protection * -7V to +12V common-mode input voltage range * Half-Duplex or Full-Duplex configuration * Allows up to 1 unit load (32 devices) on the same common bus * Controlled driver output slew rate and receiver input filtering * Active-high driver enable and active-low receiver enable * ESD Protection on bus terminals 15kV Human Body Model (HBM) * Drop-in Replacements for MAX483E, MAX485E, MAX488E, MAX489E, MAX490E, MAX491E. * High fanout driving 1/4 unit load (128 devices) available on ZT485ER Series
ZT483E, ZT485E, ZT488E ZT489E, ZT490E, ZT491E
Low Power 5V 250kbps/10Mbps RS485 Transceivers
General Description
The ZT485E series devices are 5V differential data line transceivers for RS485/RS422 communication that consist of one driver and one receiver with high level of ESD protection. They are designed for balanced transmission lines interface that meet ANSI standard TIA/EIA-485-A and ISO 8482:1987(E) specifications. The ZT485E series devices spans out with half or full duplex, data rate guaranteed at 250k bit per second or 10Mbps, and allow one unit load that fan out 32 devices sharing a common bus. The I/Os are enhanced-electrostatic discharge (ESD) protected, exceeding 15kV Human Body Model (HBM).
Applications
* * * * * * * * * * RS422/RS485 communications Utility meters Industrial process control Building automation Level tranlators Transceivers for EMI-sensitive applications Routers and HUBs Industrial-controlled Local Area Networks Industrial PCs, embedded PCs and peripherals Industrial, security CATV and camera applications
ZT483E/ZT485E
Product Selection Guide And Cross Reference
Part # 0f Duplex Number Tx/Rx ZT483E ZT485E ZT488E ZT489E ZT490E ZT491E Half Half Full Full Full Full 1/1 1/1 1/1 1/1 1/1 1/1 Data # of Rate Tx/Rx (Mbps) on Bus 0.25 10 0.25 0.25 10 10 32 32 32 32 32 32 Slew Rate Limit Yes No Yes Yes No No
Now Available in Green Package Option
ESD on Tx/Rx 15kV 15kV 15kV 15kV 15kV 15kV Number of Pins 8 8 8 14 8 14 Pin-to-Pin Cross Reference
Rx LowTx/Rx Input Power Enable Filtering Shutdown Yes No Yes Yes No No Yes Yes No Yes No Yes Yes Yes No Yes No Yes
MAX483E MAX485E MAX488E MAX489E MAX490E MAX491E
Zywyn
1
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation * Tel (408) 733-3225 * Fax (408) 733-3206 * Email sales@zywyn.com * www.zywyn.com
Zywyn Corporation 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 Input Voltages DI, DE, RE (VIH), High Input Voltage .............. +2V to +6.0V DI, DE, RE (VIL), Low Input Voltage ............... 0V to +0.8V Differential Input Voltage, (VID) ..................... -12V to +12V A, B (VI) .......................................................... +12V to -7V Output Voltages RO ..................................................... -0.3V to (VCC +0.3V) Y, Z (A & B on ZT485) ...................................... +12V to -7V Operating Temperature ................................ -40C to +85C Storage Temperature ................................. -65C to +150C Power Dissipation Per Package 8-pin PDIP (derate 9.09mW/C above +70C) ........... 722mW 8-pin nSOIC (derate 6.14mW/C above +70C) ........ 500mW 14-pin PDIP (derate 10.00mW/C above +70C) ........ 800mW 14-pin nSOIC (derate 8.33mW/C above +70C) ...... 667mW
ZT4xxE Storage Considerations
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 40C and 60%RH. If the parts are removed from the bag, they should be used within 48 hours or stored in an environment at or below 20%RH. If the above conditions cannot be followed, the parts should be baked for four hours at 125C in order remove moisture prior to soldering. Zywyn ships product in Dry Vapor Barrier Bags with a humidity indicator card and desiccant pack. The humidity indicator should be below 30%RH. The information furnished by Zywyn 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 Zywyn. 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 Zywyn Corporation.
Zywyn
Specifications subject to change without notice
2
August 2004
rev.1.2
Zywyn Corporation DC Electrical Characteristics
Unless otherwise stated, VCC = +5.0V, TA = Tmin to Tmax, typical values apply at VCC = +5.0V and TA = 25C. Parameter TTL Logic Input TTL Logic Output RS485 Input RS485 Output Power Pin Temp 0C to +70C Temp -40C to +85C VCC Voltage Range Supply Current ICC, Tx and Rx active ICC, Tx active ICC, Rx active ISD, Shutdown Current TTL LOGIC Input Input Threshold Low Input Threshold High TTL LOGIC Output Output Voltage Low Output Voltage High Output Leakage Current Short Circuit Current Receiver Input Input Current DE = 0V, VCC = 0V to 5.25V, VIN = +12V DE = 0V, VCC = 0V to 5.25V, VIN = -7V -0.2 20 12 VCM = 0V VCM = -7V to +12V No Load 2 1.5 IOUT = +4mA, Input Differential Voltage = 200mV IOUT = -4mA, Input Differential Voltage = 200mV Receiver Outputs Disabled, VOUT = 0.4V to 2.4V VOUT = 0V to VCC 7 3.5 VCC = +5.0V Supply, DE, DI, and RE VCC = +5.0V Supply, DE, DI, and RE 2.0 DI=VCC/GND, DE=VCC, RE=GND, RS485 I/P=Open DI=VCC/GND, DE=VCC, RE=VCC, RS485 I/P=Open DI=VCC/GND, DE=GND, RE=GND, RS485 I/P=Open DI=VCC/GND, DE = GND, RE = VCC, RS485 I/P=Open 400 400 400 1.0 Condition DE, DI, RE RO A, B Y, Z VCC, VGND Commercial Grade Industrial Grade VCC = +5.0V Supply Min Typ
ZT4xxE
Max
Units
High ZO/P when disabled High ZO/P when disabled 0 -40 4.75 +25 +25 5.0 +70 +85 5.25 900 900 900 10 C C V A A A A
0.8
V V
0.4 1 95 1.0 -0.8 +0.2
V V A mA mA mA V mV k
DIfferentialThresholdVoltage,VTH VCM = 0V, VCC=+5.0V, TA=25oC Input Hysteresis Input Resistance, RIN Transmitter Output DIfferentialOutputVoltage,VOD
5 5 3 0.2 0.2 250 250
V V V V V V mA mA
DIfferentialOutputVoltage,dVOD With RL = 50, CL = 50pF, Refers to figure 1. (RS422) With RL = 27, CL = 50pF, Refers to figure 1. (RS485) DriverCommonModeOutput ChangeinVoltageMagnitude forComplimentaryStates,dVOC ChangeinVoltageMagnitude forComplimentaryStates,VOC TransmitterShort-CircuitCurrent With RL = 27 or 50. CL = 50pF. Refers to figure 3. Differential Output Voltage, with RL = 27 or 50, CL = 50pF. Refers to figure 1. Common-Mode Output Voltage, with RL = 60,375,375. Refers to figure 2. Output HIGH, VOUT= -7V to +12V. Refers to figure 7. Output LOW, VOUT= -7V to +12V. Refers to figure 7.
Zywyn
3
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation AC Electrical Characteristics (ZT485E, ZT490E, and ZT491E)
Unless otherwise stated, VCC = +5.0V, TA = Tmin to Tmax, typical values apply at VCC = +5.0V and TA = 25C. Parameter Transmitter Timing Transmitter Propagation tPLH Transmitter Propagation tPHL Transmitter Output Skew tSK Transmitter Rise/Fall Time Transmitter Output Enable Transmitter Output Disable Receiver Timing Receiver Propagation tPLH Receiver Propagation tPHL Differential Receiver Skew tSK Receiver Output Enable Receiver Output Disable Transceiver Throughput Maximum Data Rate ESD Tolerance ESD HBM RS485 Inputs and Outputs 15 RL = 54, CL = 50pF, TA = 25C 10 CL = 15pF, Refers to figure 9. CL = 15pF, Refers to figure 9. |tPHL - tPLH| To Output HIGH, CL = 15pF. Refers to figure 10. To Output LOW, CL = 15pF. Refers to figure 11. From Output HIGH, CL = 15pF. Refers to figure 10. From Output LOW, CL = 15pF. Refers to figure 11. 50 50 10 50 50 50 50 150 150 RDIFF = 54, CL = 50pF. Refers to figure 4. RDIFF = 54, CL = 50pF. Refers to figure 4. |tPLH - tPHL| tr, tf , RDIFF = 54, CL = 50pF, ZT485E. Refers to figure 4. tr, tf , RDIFF = 54, CL = 50pF, ZT490E and ZT491E, refer fig.4. To Output HIGH, CL = 50pF, RL = 110. Refers to figure 5. To Output LOW, CL = 50pF, RL = 110. Refers to figure 6. From Output HIGH, CL = 50pF, RL = 110. Refers to figure 5. From Output LOW, CL = 50pF, RL = 110. Refers to figure 6. 35 35 3 15 15 50 50 50 50 60 60 10 25 25 Condition Min Typ Max
ZT4xxE
Units
ns ns ns ns ns ns ns ns ns
ns ns ns ns ns ns ns
Mbps
kV
Zywyn
Specifications subject to change without notice
4
August 2004
rev.1.2
Zywyn Corporation AC Electrical Characteristics (ZT483E, ZT488E, and ZT489E)
Unless otherwise stated, VCC = +5.0V, TA = Tmin to Tmax, typical values apply at VCC = +5.0V and TA = 25C. Parameter Transmitter Timing Transmitter Propagation tPLH Transmitter Propagation tPHL Transmitter Output Skew tSK Transmitter Rise/Fall Time Transmitter Output Enable Transmitter Output Disable Receiver Timing Receiver Propagation tPLH Receiver Propagation tPHL Differential Receiver Skew tSK Receiver Output Enable Receiver Output Disable Shutdown Timing Time to Shutdown, tSHDN Transmitter Enable from SHUTDOWN to Output HIGH Transmitter Enable from SHUTDOWN to Output LOW Receiver Enable from SHUTDOWN to Output HIGH Receiver Enable from SHUTDOWN to Output LOW Transceiver Throughput Maximum Data Rate ESD Tolerance ESD HBM RS485 Inputs and Outputs 15 RL = 54, CL = 50pF, TA = 25C. 0.25 ZT483E CL = 50pF, RL = 110. Refers to figure 5. CL = 50pF, RL = 110. Refers to figure 6. CL = 15pF, RL = 1k. Refers to figure 12. CL = 15pF, RL = 1k. Refers to figure 12. 50 200 200 200 200 200 CL = 15pF, Refers to figure 9. CL = 15pF, Refers to figure 9. |tPHL - tPLH| To Output HIGH, CL = 15pF, Refers to figure 10. To Output LOW, CL = 15pF, Refers to figure 11. From Output HIGH, CL = 15pF, Refers to figure 10. From Output LOW, CL = 15pF, Refers to figure 11. 250 250 10 100 100 100 100 RDIFF = 54, CL = 50pF. Refers to figure 4. RDIFF = 54, CL = 50pF. Refers to figure 4. |tPLH - tPHL| tr, tf , RDIFF = 54, CL = 50pF, Refers to figure 4. To Output HIGH, CL = 50pF, RL = 110. Refers to figure 5. To Output LOW, CL = 50pF, RL = 110. Refers to figure 6. From Output HIGH, CL = 15pF, RL = 110. Refers to figure 5. From Output LOW, CL = 15pF, RL = 110. Refers to figure 6. 250 250 250 100 100 100 100 800 800 20 Condition Min Typ
ZT4xxE
Max
Units
2000 2000 800 2000
ns ns ns ns ns ns ns ns
2000 2000
ns ns ns ns ns ns ns
600
ns ns ns ns ns
Mbps
kV
Zywyn
5
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation Pin Description
Pin Numbers
ZT483E/ZT485E
1
ZT4xxE
Name
ZT489E/ZT491E
2 RO
Description
Receiver Output. If A>B by 200mV, then RO = HIGH; If AZT488E/ZT490E
2
2
n/a
3
RE
3
n/a
4
DE
4
3
5
DI
5 n/a n/a 6
4 5 6 n/a
6, 7 9 10 n/a
GND Y Z A
n/a 7
8 n/a
12 n/a
A B
n/a 8 n/a
7 1 n/a
11 14 1, 8, 13
B VCC NC
Zywyn
Specifications subject to change without notice
6
August 2004
rev.1.2
Zywyn Corporation Circuit Description
The ZT483E, ZT485E, ZT489E, ZT490E, and ZT491E are low-power transceivers for RS-485 and RS-422 communications. The RS-485 standard is ideal for multi-drop applications and for long-distance interfaces. The TIA/EIA-485 specification allows up to 32 drivers and 32 receivers to be connected to a data bus, making it an ideal choice for multidrop applications. RS-485 transceivers are equipped with a wide (-7V to +12V) common mode range to accommodate ground potential differences since the cabling can be as long as 4,000 feet. As RS-485 is a differential interface, data is virtually immune to noise in the transmission line. The ZT483E, ZT488E, and ZT489E are slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables.
ZT4xxE
Bus Configuration
The ZT489E, ZT490E, and ZT491E are full-duplex transceivers, while the ZT483E and ZT485E are half-duplex. For full duplex, the devices are used as a four-wire bus transceiver with a configuration that the transmitters and receivers are moving data independent of each other. Transmit can occur on a dedicated two-wire pair and receive can occur on an adjacent two-wire pair, with each pair transferring data at up to 10Mbps (up to 250kbps for the ZT489E). Half duplex is a configuration where the transmitter outputs are connected to its receiver inputs. This application is common for two-wire interfaces where either the transmitter is active or the receiver is active. It is common to connect the enable inputs for the transmitter and receiver together so that a logic HIGH will enable the transmitter and disable the receiver. Conversely, a logic LOW will disable the transmitter and enable the transmitter. Half-duplex configuraitons and these devices are designed for bidirectional data transmission on multipoint twisted-pair cables for applications, such as digital motor controllers, remote sensors and terminals, industrial process control, security stations and environmental control systems.
RS-485 Transmitters
Each device in the ZT4xxE family contains a differential output line transmitter that can drive voltage into multiple loads on a terminated two-wire pair, and a receiver that accepts a differential voltage down to 200mV. The transmitter's differential output can comply with RS-485 and also RS-422 standards. The typical voltage output swing with no load is 0V to VCC. With worst case loading of 54 ohms across the differential outputs, the drivers can maintain greater than 1.5V voltage levels, which is more than adequate for a differential receiver to acknowledge a logic state. The 54 ohms is the equivalent of two 120 ohm termination resistors placed on each side of the transmission line and the input impedance of 32 receivers on the line. The ZT485E transmitter has an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential outputs. A logic LOW on DE (pin 3) will disable the transmitter outputs. While disabled, the transmitter outputs are in high impedance.
ESD Immunity
Electro-Static Discharge (ESD) is an important factor when implementing a serial port into a system, especially in harsh environmental conditions. These industrial strength devices provide extra protection against ESD and are intended for harsh environments where high-speed data communication is important. All of the ZT485E family of transceivers incorporate internal protection structures on all pins to protect against ESD charges encountered during handling and assembly. The driver outputs and receiver inputs have extra protection against static electricity as they are directly interfacing to the outside environment. As such, these pins against ESD of 15kV without damage in all states of the transceiver's operation in the static state. After multiple ESD events, Zywyn's ZT485E family of transceivers keep working without latchup. These devices eliminate the need for external transient suppressor diodes and the associated high capacitance loading, allowing reliable high-speed data communications. 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.
RS-485 Receivers
Each transceiver contains one differential receiver that has an input sensitivity of 200mV. The input impedance of the receivers is typically 15 kohms. A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The ZT485E, ZT489E, and ZT491E receivers have an enable control input. A logic LOW on RE will enable the receiver, a logic HIGH on RE will disable the receiver. The receivers are equipped with the fail-safe feature, which guarantees that the receiver output will be in a HIGH-IMPEDANCE state when the input is left unconnected. The ZT485E, ZT490E, and ZT491E can transmit and receive at data rates up to 10Mbps. The ZT483E, ZT488E, and ZT489E are specified for data rates up to 250kbps.
Zywyn
7
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation Function Truth Table
ZT483E/ZT485E
ZT4xxE
DRIVER Input DI H L X Open X Enable DE H H L H Open Outputs A H L Z H Z B L H Z L Z
RECEIVER Differential Inputs VID = VA - VB VID -0.2V -0.2V < VID < +0.2V +0.2V VID X X Enable RE L L L H Open Output RO L U H Z Z
ZT488E/ZT490E
DRIVER Input DI H L X Open X
ZT489E/ZT491E
RECEIVER Outputs Y H L Z H Z Z L H Z L Z Differential Inputs VID = VA - VB VID -0.2V -0.2V < VID < +0.2V +0.2V VID X X Output RO L U H Z Z
DRIVER Input DI H L X Open X Enable DE H H L H Open Outputs Y H L Z H Z Z L H Z L Z
RECEIVER Differential Inputs VID = VA - VB VID -0.2V -0.2V < VID < +0.2V +0.2V VID X X Enable RE L L L H Open Output RO L U H Z Z
Note: H = High Level; L = Low Level; Z = High Impedance; X = Irrelevant; U = Undetermine State.
Zywyn
Specifications subject to change without notice
8
August 2004
rev.1.2
Zywyn Corporation Pin Configuration
ZT4xxE
ZT483E/ZT485E
ZT488E/ZT490E
ZT489E/ZT491E
8-Pin PDIP/nSOIC
8-Pin PDIP/nSOIC
14-Pin PDIP/nSOIC
Typical Application Circuits
D
D
R D R
Up to 32 Transceivers on the bus
R R D
Notes: A. The bus should be terminated at both ends in its characteristic impedance of RT = ZO. B. Stub lengths off the main bus should be kept as short as possible. C. Can connect up to 32 devices on the same common bus.
Zywyn
9
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation Typical Test Circuits
Notes: A. The test load capacitance includes probe and test jig capacitance, unless otherwise specified. B. The signal generator had the following characteristics: Pulse rate = 1000 kHz, 50% duty cyle, ZO = 50 , tr & tf < 6ns, unless otherwise specified.
ZT4xxE
++12V
Figure 1. Driver Test Circuit, VOD and VOC Without Common-Mode Loading
Figure 2. Driver Test Circuit, VOD With CommonMode Loading
3.25V 1.75V
Figure 3. Driver Common-Mode Output Voltage (VOC) Test Circuit and Waveforms
Figure 4. Driver Differential Output Voltage (VOD) Switching Test Circuit and Waveforms
Figure 5. Driver Enable/Disable Test Circuit and Waveforms, High Output
Zywyn
Specifications subject to change without notice
10
August 2004
rev.1.2
Zywyn Corporation Typical Test Circuits
ZT4xxE
Figure 6. Driver Enable/Disable Test Circuit and Waveforms, Low Output
Figure 7. Driver Short-Circuit Test Configuration
Figure 8. Receiver Parameter Definitions
Figure 9. Receiver Propagation (tPLH and tPHL)Test Circuit and Waverforms
Figure 10. Receiver Output Enable/Disable Test Circuit and Waveforms, Data Output High
Figure 11. Receiver Output Enable/Disable Test Circuit and Waveforms, Data Output Low
Zywyn
11
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation Package Information
ZT4xxE
8-pin PDIP
14-pin PDIP
Zywyn
Specifications subject to change without notice
12
August 2004
rev.1.2
Zywyn Corporation
ZT4xxE
8-pin nSOIC
ZYWYN CORPORATION
14-pin nSOIC
Zywyn
13
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation Ordering Information
Part Number ZT483ECN ZT483ECP ZT485ECN ZT485ECP ZT488ECN ZT488ECP ZT489ECN ZT489ECP ZT490ECN ZT490ECP ZT491ECN ZT491ECP ZT483EEN ZT483EEP ZT485EEN ZT485EEP ZT488EEN ZT488EEP ZT489EEN ZT489EEP ZT490EEN ZT490EEP ZT491EEN ZT491EEP Temperature Range 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Type 8-pin nSOIC 8-pin PDIP 8-pin nSOIC 8-pin PDIP 8-pin nSOIC 8-pin PDIP 14-pin nSOIC 14-pin PDIP 8-pin nSOIC 8-pin PDIP 14-pin nSOIC 14-pin PDIP 8-pin nSOIC 8-pin PDIP 8-pin nSOIC 8-pin PDIP 8-pin nSOIC 8-pin PDIP 14-pin nSOIC 14-pin PDIP 8-pin nSOIC 8-pin PDIP 14-pin nSOIC 14-pin PDIP
ZT4xxE
Please contact the factory for pricing, availabiliy on Tape-and-Reel, and Green Package options. To order for Green Packaging, the ordering part number format is ZT4xxL where "L" stands for the Green Package. For example: ZT483LECN for standard 32-fanout commercial temperature 8-pin nSOIC Green Package, ZT485LEEN for standard 32-fanout industrial temperature 8-pin nSOIC Green Package, or ZT491LEEP for standard 32-fanout industrial temperature 14-pin PDIP Green Package.
Zywyn Corporation
Headquarters and Sales Office 1270 Oakmead Parkway, Suite 201 * Sunnyvale, CA 94085 * Tel: (408) 733-3225 * Fax: (408) 733-3206 Email: sales@zywyn.com * www.zywyn.com
Zywyn Corporation reserves the right to make changes to any products described herein. Zywyn does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. (c) 2004 Zywyn Corporation
Zywyn
Specifications subject to change without notice
14
August 2004
rev.1.2

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