Grant Signal Generator

Product Specifications

Technical details and manufacturing context for Grant Signal Generator

Definition

The Grant Signal Generator is a critical sub-component of a Bus Arbiter system responsible for producing and transmitting grant signals. When multiple devices compete for access to a shared bus, the arbiter evaluates requests and uses this generator to issue authorization signals to the winning device, enabling controlled and orderly data transfer while preventing conflicts. This component is typically implemented as a digital logic circuit, often integrated into a larger arbiter chip or as a standalone part. It operates based on decision inputs from the arbiter's priority logic, which may employ fixed, round-robin, or other scheduling algorithms. The generator ensures that only one grant signal is active at any given time, maintaining bus integrity and preventing multiple devices from driving the bus simultaneously. The component is designed for use in computer, electronic, and optical product manufacturing, particularly in systems requiring shared bus access, such as microprocessors, microcontrollers, and system-on-chip designs. Key electrical parameters include a supply voltage range of 3.3–5 V DC, supply current of 10–50 mA, and output frequency up to 100 MHz. Output high and low levels conform to JEDEC JESD8C for 3.3 V logic. Propagation delay from request to grant assertion is 1–5 ns. The component is rated for industrial temperature ranges (-40 to 85 °C operating, -55 to 125 °C storage) and humidity up to 95% RH non-condensing. It has an ESD tolerance of ±2000 V (HBM) per IEC 61000-4-2. The typical package is QFN-32 with a 5×5 mm footprint, weighing 0.5–1.0 g. Materials include semiconductor silicon, copper, and plastic encapsulation. For procurement, verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The Grant Signal Generator receives decision inputs from the arbiter's logic circuitry, which evaluates requests based on priority algorithms such as fixed or round-robin. Upon determining the winning device, the generator activates the corresponding grant signal line. This is typically achieved using digital logic gates, flip-flops, or state machines that ensure only one grant signal is active at a time, preventing bus conflicts. The output signals are driven to appropriate voltage levels as per JEDEC standards, and the propagation delay is minimized to meet system timing requirements.

Common Materials

Semiconductor silicon, Copper, Plastic encapsulation

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	3.3–5 V DC	Operating range for logic and I/O
Supply Current	10–50 mA	Depends on load and frequency
Output Frequency	1–100 MHz	Maximum grant signal rate
Output High Level	2.4–3.6 V	For 3.3 V logicJEDEC JESD8C
Output Low Level	0–0.4 V	For 3.3 V logicJEDEC JESD8C
Propagation Delay	1–5 ns	From request to grant assertion
Operating Temperature	-40–85 °C	Industrial gradeIEC 60068-2-14
Storage Temperature	-55–125 °C	Non-operatingIEC 60068-2-2
Humidity	5–95 % RH	Non-condensingIEC 60068-2-78
ESD Tolerance	±2000 V	HBM modelIEC 61000-4-2
Package Type	QFN-32	Footprint 5×5 mmJEDEC MO-220
Weight	0.5–1.0 g	Depends on package

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Decoder Circuit
Translates arbiter's internal decision into specific grant line activation

Material: Semiconductor
Output Buffer
Amplifies and drives the grant signal on the bus lines

Material: Semiconductor
Timing Control Logic
Ensures proper signal timing and prevents overlapping grants

Material: Semiconductor

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Bus Arbiter

View system integration details

Arbitration Logic Unit

View system integration details

Manufacturers of Grant Signal Generator

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Frequently Asked Questions

What is the function of a Grant Signal Generator?

It generates grant signals to authorize bus access to a requesting device, based on the arbiter's decision, ensuring only one device accesses the bus at a time.

What are the typical supply voltage and current?

Supply voltage is 3.3–5 V DC, and supply current is 10–50 mA, depending on load and frequency.

What is the output frequency range?

The maximum grant signal rate is 1–100 MHz, as specified in the parameters.

What standards apply to this component?

Relevant standards include JEDEC JESD8C for output levels, IEC 60068-2-14 for temperature, and IEC 61000-4-2 for ESD. Always verify compliance with the manufacturer.

Data Basis

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Preliminary Technical Classification

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voltage:	3.3V ±10% (typical bus arbiter supply)
temperature:	-40°C to +85°C (industrial grade)
clock frequency:	Up to 100 MHz (synchronous operation)
signal rise time:	< 2 ns (for clean grant signal generation)

Product Specifications

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