ST485E_07 STMICROELECTRONICS | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 19
Technical content
Datasheet sections
- 1 Pin configuration
- 2 Truth tables
- 3 Maximum ratings
- 4 Electrical characteristics
- 5 Test circuit and typical characteristics
- 6 Package mechanical data
- 7 Revision history
Part numbers Temperature range Package Packaging ST485ECN 0 to 70 °C DIP-8 50parts per tube / 40tube per box ST485EBN -40 to 85 °C DIP-8 50parts per tube / 40tube per box ST485EXN -55 to 125 °C DIP-8 50parts per tube / 40tube per box ST485EBD -40 to 85 °C SO-8 (Tube) 100parts per tube / 20tube per box ST485ECDR 0 to 70 °C SO-8 (Tape & reel) 2500 parts per reel ST485EBDR -40 to 85 °C SO-8 (Tape & reel) 2500 parts per reel ST485EXDR -55 to 125 °C SO-8 (Tape & reel) 2500 parts per reel ST485E ±15KV ESD protected, low power RS-485/RS-422 transceiver General features ■ Low quiescent current: 300µA ■ Designed for RS-485 interface application ■ -7V to 12V common mode input voltage range ■ Driver maintains high impedance in 3-state or with the power OFF ■ 70mV typical input hysteresis ■ 30ns propagation delay, 5ns skew ■ Operates from a single 5V supply ■ Current limiting and thermal shutdown for driver overload protection ■ ESD protection: – ±15KV (H.B.M.) – ±8KV (IEC-1000-4-2 contact discharge) ■ Allows up to 64 transceivers on the bus
Description
The ST485E is a low power transceiver for RS- 485 and RS-422 communication. Each driver output and receiver input is protected against ±15KV electrostatic discharge (H.B.M.) (ESD) shocks, without latch-up. These parts contain one driver and one receiver in half duplex configuration. This transceiver draws 300µA (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5V supply. Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that place the driver outputs into a high-impedance state. The ST485E is designed for bi-directional data communications on multipoint bus transmission lines (half-duplex applications). DIP-8 SO-8
1 Pin configuration
Figure 1. Pin connections (top view) Table 1. Pin description
1 RO Receiver output
3 DE Driver output enable
4 DI Driver input
5 GND Ground
6 A Non-inverting receiver input and non-inverting driver output
7 B Inverting receiver input and inverting driver output
2 Truth tables
Table 2. Truth table (driver) Table 3. Truth table (receiver)
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur. of +7V, but their absolute addition exceed 13 V. Table 4. Absolute maximum ratings
4 Electrical characteristics
Table 5. ESD Performance: transmitter outputs, receiver inputs Table 6. DC Electrical characteristics (VCC = 5V ± 5%, TA = TMIN to TMAX, unless otherwise
- All currents into device pins are positiv e; all out of device pins are negative; all voltages are referenced to device ground
- Supply current specification is valid for loaded transmitters when V DE = 0V
- Applies to peak current. See typical Operating Characteristics.
Table 7. Driver switching characteristics (VCC = 5V ± 5%, TA = TMIN to TMAX, unless otherwise Figure 4. and Figure 6.) 15 40 ns
- All currents into device pins are positiv e; all out of device pins are negative; all voltages are referenced to device ground
5 Test circuit and typical characteristics
Figure 2. Driver DC test load Figure 3. Receiver timing test load Figure 4. Drive/receiver timing test circuit Figure 5. Driver timing test load
6 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOP ACK is an ST trademark. ECOPACK specifications are available at: www.st.com
DIM. mm. inch A 3.3 0.130 a1 0.7 0.028 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b 0.5 0.020 b1 0.38 0.5 0.015 0.020 D 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 0.280 I 4.8 0.189 L 3.3 0.130 Z 0.44 1.6 0.017 0.063 Plastic DIP-8 MECHANICAL DATA P001F
DIM. mm. inch A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ˚ (max.) ddd 0.1 0.04 SO-8 MECHANICAL DATA 0016023/C
DIM. mm. inch A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 Tape & Reel SO-8 MECHANICAL DATA
7 Revision history
Table 9. Revision history 21-Mar-2006 9 Order codes has been updated and new template. 05-Jun-2006 10 Change value row 10 in general features and R IN in Table 6. 29-Jan-2007 11 Typo mistake on page 1.