ADM3078EARZ Inside IC Chip Programmer ESD Protected 3.3 V Full Duplex

ADM3078EARZ Inside IC Chip Programmer ESD Protected 3.3 V Full Duplex

ADM3078EARZ 3.3 V, ±15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers

FEATURES

TIA/EIA RS-485/RS-422 compliant ±15 kV ESD protection on RS-485 input/output pins Data rates ADM3070E/ADM3071E/ADM3072E: 250 kbps

ADM3073E/ADM3074E/ADM3075E: 500 kbps

ADM3076E/ADM3077E/ADM3078E: 16 Mbps

Half- and full-duplex options True fail-safe receiver inputs Up to 256 nodes on the bus −40°C to +125°C temperature option Hot-swap input structure on DE and RE pins Reduced slew rates for low EMI Low power shutdown current (all except ADM3071E/ADM3074E/ADM3077E) Outputs high-Z when disabled or powered off Common-mode input range: −7 V to +12 V Thermal shutdown and short-circuit protection 8-lead and 14-lead narrow SOIC packages APPLICATIONS Power/energy metering Industrial control Lighting systems Telecommunications Security systems Instrumentation

GENERAL DESCRIPTION

The ADM3070E to ADM3078E are 3.3 V, low power data transceivers with ±15 kV ESD protection suitable for full- and half-duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission, and they comply with TIA/EIA standards RS-485 and RS-422. The devices have an ⅛ unit load receiver input impedance, which allows up to 256 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus. The receiver inputs have a true fail-safe feature, which eliminates the need for external bias resistors and ensures a logic high output level when the inputs are open or shorted. This guarantees that the receiver outputs are in a known state before communication begins and when communication ceases.

ABSOLUTE MAXIMUM RATINGS

TA = 25°C, unless otherwise noted.

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