Murata has released the NM485D6S5MC and NMTTLD6S5MC low power electrically isolated data communication devices to provide RS485 or TTL interfaces with isolated power. No external components are needed; a single 5 V supply allows function on either side of the isolation boundary. With the combination of isolated data communication and power in a single module, the devices save space and design time.

The NM485D6S5MC is designed for single-channel full duplex data communication or multipoint bus transmission. The device combines a tristate differential line driver and a differential input line receiver. The driver and receiver have active high and active low enables respectively that can be connected to function as direction control. It is designed for industrial applications with an operating temperature range from -40°C to +85°C and a tested isolation of 3 kV_AC(RMS) in a surface-mount package measuring only 18.16 mm x 14.5 mm. Single-channel full duplex isolation is provided for the NM485; the device has UL60950 approval pending for reinforced insulation to 250 V_AC.

The NMTTLD6S5MC provides quad-channel digital isolation for NMTTL with two transmit and two receive lines for data rates up to 25 Mbps. It is also designed for industrial applications and features an operating temperature range from -40°C to +95°C and a tested isolation of 1500 V_AC(RMS) in a surface-mount package measuring only 16.9 mm x 14.5 mm. The device has UL60950 approval pending for basic insulation to 250 V_AC.

Both devices provide a regulated 5 V output for digital circuitry, as well as unregulated ±6 V isolated outputs for powering analog circuitry, A/D, or op amps. Both devices have ANSI/AAMI ES60601-1, 2x MOOPs (NMTTL has just one) and 1x MOPPs safety recognition at 250 V_AC, offering ease of system approval for medical systems safety approval purposes. The devices’ very low coupling capacitance figure of 5 pF typical reduces system EMI problems.