Aeroflex / Tektronix / CDS 53A-123 Differential Communications Card (8-bit Parallel)

The Aeroflex / Tektronix / CDS 53A-123 is a differential communications card that enables 8-bit parallel data transfer within CDS 53/63 Series Systems. Using Texas Instruments TI 75119 differential drivers and receivers, the card transmits data at rates up to 500,000 ASCII characters per second over distances reaching 300 m (984 feet). Differential signaling at 130 ohms impedance ensures reliable operation in electrically noisy environments.

The card mounts as a single-width module within the 53/63 card cage and draws power from the internal 5 V DC supply.

Technical Specifications

• Data Protocol: 8-bit parallel ASCII


• Maximum Data Rate: 500,000 ASCII characters per second


• Maximum Communication Distance: 300 m (984 feet)


• Differential Impedance: 130 ohms


• Differential Driver/Receiver: Texas Instruments TI 75119


• Power Supply: 5 V DC from 53/63 Series Card Cage (4.75 V DC to 5.25 V DC)


• Quiescent Current: 1.05 A maximum


• Peak Current: 1.15 A

Key Features

• Differential communications link eliminates common-mode noise on long parallel runs


• Power LED indicates addressing state and power status


• Integrated fuse protection against system overloads


• Function LEDs display operating mode and status


• Single-width form factor: 13 mm (0.5 inches) wide, 197 mm (7.75 inches) tall, 221 mm (8.69 inches) deep


• Operating temperature range: -10 °C to +65 °C


• Storage temperature range: -40 °C to +85 °C


• Humidity rated to 95% RH non-condensing (-10 °C to +30 °C), 75% RH (+31 °C to +40 °C), 45% RH (+41 °C to +55 °C)

Compatibility & Integration Designed exclusively for CDS 53/63 Series Systems. Establishes differential communications links between card cages in chained system configurations. Direct integration into existing 53/63 installations without external interface conversion.