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MAX3094ECSE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3094ECSE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 13 page _______________Detailed Description ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against ESDs encoun- tered during handling and assembly. The MAX3093E/MAX3094E receiver inputs have extra protection against static electricity found in normal operation. Maxim’s engineers have developed state- of-the-art structures to protect these pins against ±15kV ESD without damage. After an ESD event, the MAX3093E/MAX3094E continue working without latchup. ESD protection can be tested in several ways. The receiver inputs are characterized for protection to the following: • ±15kV using the Human Body Model • ±8kV using the Contact Discharge Method specified in IEC 1000-4-2 (formerly IEC 801-2) • ±15kV using the Air-Gap Method specified in IEC 1000-4-2 (formerly IEC 801-2) ESD Test Conditions ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results. Human Body Model Figure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when dis- charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the device through a 1.5k Ω resistor. IEC 1000-4-2 Since January 1996, all equipment manufactured and/or sold in the European community has been required to meet the stringent IEC 1000-4-2 specification. The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to inte- grated circuits. The MAX3093E/MAX3094E help you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without additional ESD-protection compo- nents. The main difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2. Because series resistance is lower in the IEC 1000-4-2 ESD test model (Figure 5a), the ESD-withstand voltage measured to this standard is gen- erally lower than that measured using the Human Body Model. Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 Level 4 ESD Contact Discharge test. The Air-Gap test involves approaching the device with a charge probe. The Contact-Discharge method connects the probe to the device before the probe is energized. Machine Model The Machine Model for ESD testing uses a 200pF stor- age capacitor and zero-discharge resistance. It mimics the stress caused by handling during manufacturing and assembly. All pins (not just RS-485 inputs) require this protection during manufacturing. Therefore, the Machine Model is less relevant to the I/O ports than are the Human Body Model and IEC 1000-4-2. Low-Power Shutdown Mode The function tables show the functionality of the enable inputs. The MAX3093E/MAX3094E enter shutdown when ENAC and ENBD are low. In shutdown, all out- puts go high impedance and the devices typically draw less than 1nA. The devices exit shutdown by taking either ENAC or ENBD high. The typical shutdown exit time is 600ns. ±15kV ESD-Protected, 10Mbps, 3V/5V, Low-Power Quad RS-422/RS-485 Receivers Function Tables OUTPUT YA OR YC DEVICE MODE ENAC ENBD (IN+ - IN-) On 1 X ≥ 200mV 1 On 1 X ≤ -200mV 0 1 X Open 1 On 0 1 X High-Z On 0 0 X High Shutdown X = don’t care, High-Z = high impedance 8 _______________________________________________________________________________________ OUTPUT YB OR YD DEVICE MODE ENBD ENAC (IN+ - IN-) On 1 X ≥ 200mV 1 On 1 X ≤ -200mV 0 1 X Open 1 On 0 1 X High-Z On 0 0 X High-Z Shutdown |
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