SN75160B 8-Channel GPIB Transceiver

Overview

The SN75160B is a monolithic, high-speed, low-power Schottky 8-channel General-Purpose Interface Bus (GPIB) transceiver designed for bidirectional data communication over single-ended transmission lines. This component fully complies with the IEEE Standard 488-1978 specifications for instrumentation bus systems, making it ideal for test and measurement equipment interfaces.

Engineered with robust driver outputs that support both passive-pullup and 3-state modes, the SN75160B provides flexible interface solutions. The device features independent control signals (TE and PE) that determine the operational state of the driver outputs, enabling seamless integration into various bus architectures while maintaining signal integrity at high speeds.

Key Features

• Fully compliant with IEEE Standard 488-1978 GPIB specifications
• 8-channel bidirectional transceiver architecture
• Dual-mode driver outputs: passive-pullup or 3-state operation
• Independent Talk Enable (TE) and Pullup Enable (PE) control signals
• High-speed operation suitable for GPIB timing requirements
• Low-power Schottky technology for improved efficiency
• Designed for single-ended transmission line applications
• High-impedance state when TE is low for bus isolation
• Robust output drivers capable of handling bus loads
• Wide operating voltage range

Applications

The SN75160B is particularly suited for applications requiring standardized instrumentation interfaces:

• IEEE 488 (GPIB) instrument control systems
• Test and measurement equipment interfaces
• Laboratory automation systems
• Industrial control systems
• Data acquisition systems
• Computer-peripheral interfaces
• Automated test equipment (ATE)
• Scientific instrumentation

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (Vcc): 7V
• Input Voltage Range: -0.5V to +7V
• Output Voltage Range: -0.5V to Vcc + 0.5V
• Operating Temperature Range: 0°C to +70°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (Vcc): 4.75V to 5.25V
• High-Level Input Voltage: 2V min
• Low-Level Input Voltage: 0.8V max
• Operating Ambient Temperature: 0°C to +70°C

Switching Characteristics

• Propagation Delay (Driver): 15ns typical
• Propagation Delay (Receiver): 20ns typical
• Output Rise/Fall Time: 10ns typical
• Output Enable Time: 25ns max
• Output Disable Time: 25ns max

Power Consumption

• Quiescent Current (all channels disabled): 25mA max
• Active Current per Channel: 10mA typical

Functional Description

Control Logic

The SN75160B features two primary control inputs that determine the operational mode of the driver outputs:

• Talk Enable (TE): When high, enables the driver outputs. When low, places all driver outputs in high-impedance state.
• Pullup Enable (PE): When TE is high, PE determines the output mode. Low PE selects passive-pullup mode, while high PE selects 3-state mode.

Driver Modes

The driver outputs support two distinct operational modes:

• Passive-Pullup Mode: Outputs behave as open-collector with internal pullup resistors when PE is low and TE is high.
• 3-State Mode: Outputs become active drivers when PE is high and TE is high, providing both high and low drive capability.

Receiver Characteristics

The receiver section features:

• High input impedance to minimize bus loading
• Schmitt-trigger input for improved noise immunity
• Standard TTL output levels

Package Information

Physical Specifications

• Package Type: 24-pin DIP (Dual In-line Package)
• Package Dimensions: 31.75mm x 6.35mm (1.25" x 0.25")
• Pin Spacing: 2.54mm (0.1")
• Lead Material: Copper alloy
• Finish: Solder-plated

Pin Configuration

• Pins 1-8: Data I/O (DIO1-DIO8)
• Pin 9: Ground (GND)
• Pin 10: Pullup Enable (PE)
• Pin 11: Talk Enable (TE)
• Pins 12-19: Complementary Data I/O (DIO1'-DIO8')
• Pin 20: Vcc (+5V)
• Pins 21-24: No Connection (NC)

Design Considerations

Bus Termination

For optimal signal integrity in GPIB applications:

• Use proper termination resistors (typically 3.3kΩ pullup to +5V)
• Maintain balanced line lengths for all bus signals
• Consider transmission line effects for long bus runs

Power Supply Decoupling

• Place 0.1μF ceramic capacitor close to Vcc pin
• Additional 10μF electrolytic capacitor recommended for multi-device systems

Thermal Management

• Ensure adequate airflow in high-density applications
• Consider heat sinking for continuous high-current operation

Reliability and Compliance

• ESD Protection: 2000V Human Body Model
• Manufactured under strict quality control standards
• RoHS compliant version available (SN75160BE)