74F786

General description

The 74F786 is an asynchronous 4?bit arbiter designed for high speed real?time applications. The priority of arbitration is determined on a first?come first?served basis. Separate bus grant (BGn) outputs are available to indicate which one of the request inputs is served by the arbitration logic. All BGn outputs are enabled by a common enable (EN) pin. In order to generate a bus request signal a separate 4 input AND gate is provided which may also be used as an independent AND gate. Unused bus request (BR) inputs may be disabled by tying them high.

The 74F786 is designed so that contention between two or more request signals will not glitch or display a metastable condition. In this situation an increase in the BRn to BGn t_PHL may be observed.
A typical 74F786 has an h = 6.6ns, t = 0.41ns and To = 5msec.

Where:

h = Typical propagation delay through the device and t and To are device parameters derived from test results and can most nearly be defined as:

t = A function of the rate at which a latch in a metastable state resolves that condition.

To = A function of the measurement of the propensity of a latch to enter a metastable state. To is also a very strong function of the normal propagation delay of the device.

For further information, please refer to the 74F786 application notes.

Features

• Arbitrates between 4 asynchronous inputs
• Separate grant output for each input
• Common output enable
• On board 4 input AND gate
• Metastable?free outputs
• Industrial temperature range available (?40°C to +85°C

Products/packages

Type number	North American Type number	Ordering code (12NC)	Product status	Package	Packing	Marking	Chemical content	Leadfree conversion date
I74F786D	I74F786D	9350 402 70602	Volume production	SOT109-1 (SO16)	Tube (Signetics)	Standard Marking	I74F786D	week 6, 2004
I74F786D	I74F786D-T	9350 402 70623	Volume production	SOT109-1 (SO16)	Reel Pack, SMD, 13" (Signetics)	Standard Marking	I74F786D	week 6, 2004
I74F786N	I74F786N	9350 402 80602	Volume production	SOT38-4 (DIP16)	Tube (Signetics)	Standard Marking	I74F786N	Always Pb-free
N74F786D	N74F786D	9339 062 50602	Volume production	SOT109-1 (SO16)	Tube (Signetics)	Standard Marking	N74F786D	week 6, 2004
N74F786D	N74F786D-T	9339 062 50623	Volume production	SOT109-1 (SO16)	Reel Pack, SMD, 13" (Signetics)	Standard Marking	N74F786D	week 6, 2004
N74F786N	N74F786N	9337 952 30602	Volume production	SOT38-4 (DIP16)	Tube (Signetics)	Standard Marking	N74F786N	Always Pb-free

Pricing/ordering/availability

Type number	Ordering code(12NC)	Indicative price/unit($)	Region	Distributor	In stock	Inventory date	Buy online	Samples
I74F786D	9350 402  70602							not available
I74F786D	9350 402  70623							Order samples
I74F786N	9350 402  80602							Order samples
N74F786D	9339 062  50602	3.7300						not available
N74F786D	9339 062  50623	3.7300						Order samples
N74F786N	9337 952  30602	3.7300						Order samples

Block diagrams/pinning

Technical documents

Application Notes

Parametrics/similar products

Type number	Package	Description	Propagation Delay(ns)	Voltage	No. of Pins	Logic Switching Levels	Output Drive Capability
I74F786D	SOT109-1 (SO16)	4-Bit Asynchronous Bus Arbiter	4.5	4.5-5.5 V	16	TTL	-1/+24 mA
I74F786N	SOT38-4 (DIP16)	4-Bit Asynchronous Bus Arbiter	4.5	4.5-5.5 V	16	TTL	-1/+24 mA
N74F786D	SOT109-1 (SO16)	4-Bit Asynchronous Bus Arbiter	4.5	4.5-5.5 V	16	TTL	-1/+24 mA
N74F786N	SOT38-4 (DIP16)	4-Bit Asynchronous Bus Arbiter	4.5	4.5-5.5 V	16	TTL	-1/+24 mA

Similar products

74F786 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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