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1 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe zywyn corporation ? tel (408) 733-3225 ? fax (408) 733-3206 ? email sales@zywyn.com ? www.zywyn.com 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 features ? meets or exceeds the requirements of ansi stan- dard tia/eia-485-a and iso 8482:1987(e) specifi- cations for v cc 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 zywy n ZT485E low power 5v 250kbps/10mbps rs485 transceivers zt483e, ZT485E, zt488e zt489e, zt490e, zt491e low power 5v 250kbps/10mbps rs485 transceivers part number duplex # 0f tx/rx data rate (mbps) # of tx/rx on bus slew rate limit rx input filtering low- power shutdown tx/rx enable esd on tx/rx number of pins pin-to-pin cross reference zt483e half 1/1 0.25 32 yes yes yes yes 15kv 8 max483e ZT485E half 1/1 10 32 no no yes yes 15kv 8 max485e zt488e full 1/1 0.25 32 yes yes no no 15kv 8 max488e zt489e full 1/1 0.25 32 yes yes yes yes 15kv 14 max489e zt490e full 1/1 10 32 no no no no 15kv 8 max490e zt491e full 1/1 10 32 no no yes yes 15kv 14 max491e product selection guide and cross reference zt483e/ZT485E now available in green package option
2 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe 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 condi- tions for extended periods of time may affect reliability. power supply, (v cc ) .................................. ?0.3v to +6.0v input voltages di, de, re (v ih ), high input voltage .............. +2v to +6.0v di, de, re (v il ), low input voltage ............... 0v to +0.8v differential input voltage, (v id ) ..................... -12v to +12v a, b (v i ) .......................................................... +12v to -7v output voltages ro ..................................................... ?0.3v to (v cc +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 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 environ- ment 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 agree- ment 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 impli- cation or otherwise under any patent or patent rights of zywyn corporation.
3 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe dc electrical characteristics unless otherwise stated, v cc = +5.0v, t a = t min to t max , typical values apply at v cc = +5.0v and t a = 25c. parameter condition min typ max units ttl logic input de, di, re ttl logic output ro high z o/p when disabled rs485 input a, b rs485 output y, z high z o/p when disabled power pin v cc , v gnd temp 0c to +70c commercial grade 0 +25 +70 c temp ?40c to +85c industrial grade ?40 +25 +85 c v cc voltage range v cc = +5.0v supply 4.75 5.0 5.25 v supply current i cc , tx and rx active di=v cc /gnd, de=v cc , re=gnd, rs485 i/p=open 400 900 a i cc , tx active di=v cc /gnd, de=v cc , re=v cc , rs485 i/p=open 400 900 a i cc , rx active di=v cc /gnd, de=gnd, re=gnd, rs485 i/p=open 400 900 a i sd , shutdown current di=v cc /gnd, de = gnd, re = v cc, rs485 i/p=open 1.0 10 a ttl logic input input threshold low v cc = +5.0v supply, de, di, and re 0.8 v input threshold high v cc = +5.0v supply, de, di, and re 2.0 v ttl logic output output voltage low i out = +4ma, input differential voltage = 200mv 0.4 v output voltage high i out = ?4ma, input differential voltage = 200mv 3.5 v output leakage current receiver outputs disabled, v out = 0.4v to 2.4v 1 a short circuit current v out = 0v to v cc 795ma receiver input input current de = 0v, v cc = 0v to 5.25v, v in = +12v 1.0 ma de = 0v, v cc = 0v to 5.25v, v in = ?7v ?0.8 ma differential threshold voltage,v th v cm = 0v, v cc =+5.0v, t a =25 o c ?0.2 +0.2 v input hysteresis v cm = 0v 20 mv input resistance, r in v cm = -7v to +12v 12 k ? transmitter output differential output voltage, v od no load 5v differential output voltage, dv od with r l = 50 ?, c l = 50pf, refers to figure 1. (rs422) 2 v with r l = 27 ?, c l = 50pf, refers to figure 1. (rs485) 1.5 5 v driver common mode output with r l = 27 ? or 50 ?. c l = 50pf. refers to figure 3. 3 v change in voltage magnitude differential output voltage, with r l = 27 ? or 50 ?, c l = 50pf . 0.2 v for complimentary states, dv oc refers to figure 1. change in voltage magnitude common-mode output voltage, with r l = 60 ?, 375 ?, 375 ?. 0.2 v for complimentary states, v oc refers to figure 2. transmitter short-circuit current output high, v out = -7v to +12v. refers to figure 7. 250 ma output low, v out = -7v to +12v. refers to figure 7. 250 ma
4 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe ac electrical characteristics (ZT485E, zt490e, and zt491e) unless otherwise stated, v cc = +5.0v, t a = t min to t max , typical values apply at v cc = +5.0v and t a = 25c. parameter condition min typ max units transmitter timing transmitter propagation t plh r diff = 54 ?, c l = 50pf. refers to figure 4. 35 60 n s transmitter propagation t phl r diff = 54 ?, c l = 50pf. refers to figure 4. 35 60 n s transmitter output skew t sk || || | t plh - t phl || || | 310ns transmitter rise/fall time t r , t f , r diff = 54 ?, c l = 50pf, ZT485E. refers to figure 4. 15 25 n s t r , t f , r diff = 54 ?, c l = 50pf, zt490e and zt491e, refer fig.4. 15 25 n s transmitter output enable to output high, c l = 50pf, r l = 110 ? . refers to figure 5. 50 n s to output low, c l = 50pf, r l = 110 ? . refers to figure 6. 50 n s transmitter output disable from output high, c l = 50pf, r l = 110 ? . refers to figure 5. 50 n s from output low, c l = 50pf, r l = 110 ?. refers to figure 6. 50 n s receiver timing receiver propagation t plh c l = 15pf, refers to figure 9. 50 150 n s receiver propagation t phl c l = 15pf, refers to figure 9. 50 150 n s differential receiver skew t sk || || | t phl - t plh || || | 10 ns receiver output enable to output high, c l = 15pf. refers to figure 10. 50 n s to output low, c l = 15pf. refers to figure 11. 50 n s receiver output disable from output high, c l = 15pf. refers to figure 10. 50 n s from output low, c l = 15pf. refers to figure 11. 50 n s transceiver throughput maximum data rate r l = 54 ? , c l = 50pf, t a = 25c 10 mbps esd tolerance esd hbm rs485 inputs and outputs 15 kv
5 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe ac electrical characteristics (zt483e, zt488e, and zt489e) unless otherwise stated, v cc = +5.0v, t a = t min to t max , typical values apply at v cc = +5.0v and t a = 25c. parameter condition min typ max units transmitter timing transmitter propagation t plh r diff = 54 ?, c l = 50pf. refers to figure 4. 250 800 2000 ns transmitter propagation t phl r diff = 54 ?, c l = 50pf. refers to figure 4. 250 800 2000 ns transmitter output skew t sk || || | t plh - t phl || || | 20 800 ns transmitter rise/fall time t r , t f , r diff = 54 ?, c l = 50pf, refers to figure 4. 250 2000 ns transmitter output enable to output high, c l = 50pf, r l = 110 ? . refers to figure 5. 100 n s to output low, c l = 50pf, r l = 110 ? . refers to figure 6. 100 n s transmitter output disable from output high, c l = 15pf, r l = 110 ? . refers to figure 5. 100 n s from output low, c l = 15pf, r l = 110 ? . refers to figure 6. 100 n s receiver timing receiver propagation t plh c l = 15pf, refers to figure 9. 250 2000 ns receiver propagation t phl c l = 15pf, refers to figure 9. 250 2000 ns differential receiver skew t sk || || | t phl - t plh || || | 10 ns receiver output enable to output high, c l = 15pf, refers to figure 10. 100 n s to output low, c l = 15pf, refers to figure 11. 100 n s receiver output disable from output high, c l = 15pf, refers to figure 10. 100 n s from output low, c l = 15pf, refers to figure 11. 100 n s shutdown timing time to shutdown, t shdn zt483e 50 200 600 ns transmitter enable from shutdown to output high c l = 50pf, r l = 110 ? . refers to figure 5. 200 n s transmitter enable from shutdown to output low c l = 50pf, r l = 110 ? . refers to figure 6. 200 n s receiver enable from shutdown to output high c l = 15pf, r l = 1k ?. refers to figure 12. 200 n s receiver enable from shutdown to output low c l = 15pf, r l = 1k ?. refers to figure 12. 200 n s transceiver throughput maximum data rate r l = 54 ? , c l = 50pf, t a = 25c. 0.25 mbps esd tolerance esd hbm rs485 inputs and outputs 15 kv
6 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe pin description pin numbers name description zt483e/ZT485E zt488e/zt490e zt489e/zt491e 1 2 2 ro receiver output. if a>b by 200mv, then ro = high; if a 7 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe circuit description the zt483e, ZT485E, zt489e, zt490e, and zt491e are low-power transceivers for rs-485 and rs-422 communica- tions. the rs-485 standard is ideal for multi-drop applica- tions 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 multi- drop 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 improp- erly terminated cables. 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 v cc . with worst case loading of 54 ohms across the differential outputs, the drivers can main- tain 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 transmis- sion 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. 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. bus configuration the zt489e, zt490e, and zt491e are full-duplex transceiv- ers, 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. trans- mit can occur on a dedicated two-wire pair and receive can occur on an adjacent two-wire pair, with each pair transfer- ring 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 transmit- ter and enable the transmitter. half-duplex configuraitons and these devices are designed for bidirectional data trans- mission 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. 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 de- vices provide extra protection against esd and are intended for harsh environments where high-speed data communica- tion 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 ca- pacitance loading, allowing reliable high-speed data com- munications. the human body model has been the generally accepted esd testing method for semiconductors. this test is in- tended 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.
8 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe function truth table note: h = high level; l = low level; z = high impedance; x = irrelevant; u = undetermine state. zt483e/ZT485E zt488e/zt490e zt489e/zt491e ab hhhl l l lhlh l u xlzz l h open h h l h z x open z z open z input di enable de outputs driver x receiver -0.2v < v id < +0.2v +0.2v v id x differential inputs v id = v a - v b enable re output ro v id -0.2v yz hl l lh u zz h hl z zz z x driver outputs output ro input di h l x open receiver x x differential inputs v id = v a - v b v id -0.2v -0.2v < v id < +0.2v +0.2v v id yz hhhl l l lhlh l u xlzz l h open h h l h z x open z z open z driver input di enable de outputs x x enable re v id -0.2v -0.2v < v id < +0.2v +0.2v v id receiver differential inputs v id = v a - v b output ro
9 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe pin configuration typical application circuits 8-pin pdip/nsoic 8-pin pdip/nsoic 14-pin pdip/nsoic zt483e/ZT485E zt488e/zt490e zt489e/zt491e notes: a. the bus should be terminated at both ends in its characteristic impedance of r t = z o . 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. d d d d r r r r up to 32 transceivers on the bus
10 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe figure 1. driver test circuit, v od and v oc without common-mode loading typical test circuits figure 2. driver test circuit, v od with common- mode loading figure 3. driver common-mode output voltage (v oc ) test circuit and waveforms figure 4. driver differential output voltage (v od ) switching test circuit and waveforms figure 5. driver enable/disable test circuit and waveforms, high output + +12v 3.25v 1.75v 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, z o = 50 ? , t r & t f < 6ns, unless otherwise specified.
11 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe figure 6. driver enable/disable test circuit and waveforms, low output typical test circuits figure 7. driver short-circuit test configuration figure 8. receiver parameter definitions figure 9. receiver propagation (t plh and t phl )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
12 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe package information 8-pin pdip 14-pin pdip
13 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe zywyn corporation 8-pin nsoic 14-pin nsoic
14 august 2004 rev.1.2 zywy n specifications subject to change without notice zywyn corporation zt4xxe 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 ari sing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. ? 2004 zywyn corporation 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 . ordering information part number temperature range package type zt483ecn 0 c to +70 c 8-pin nsoic zt483ecp 0 c to +70 c 8-pin pdip ZT485Ecn 0 c to +70 c 8-pin nsoic ZT485Ecp 0 c to +70 c 8-pin pdip zt488ecn 0 c to +70 c 8-pin nsoic zt488ecp 0 c to +70 c 8-pin pdip zt489ecn 0 c to +70 c 14-pin nsoic zt489ecp 0 c to +70 c 14-pin pdip zt490ecn 0 c to +70 c 8-pin nsoic zt490ecp 0 c to +70 c 8-pin pdip zt491ecn 0 c to +70 c 14-pin nsoic zt491ecp 0 c to +70 c 14-pin pdip zt483een -40 c to +85 c 8-pin nsoic zt483eep -40 c to +85 c 8-pin pdip ZT485Een -40 c to +85 c 8-pin nsoic ZT485Eep -40 c to +85 c 8-pin pdip zt488een -40 c to +85 c 8-pin nsoic zt488eep -40 c to +85 c 8-pin pdip zt489een -40 c to +85 c 14-pin nsoic zt489eep -40 c to +85 c 14-pin pdip zt490een -40 c to +85 c 8-pin nsoic zt490eep -40 c to +85 c 8-pin pdip zt491een -40 c to +85 c 14-pin nsoic zt491eep -40 c to +85 c 14-pin pdip

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