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74F85, 74F86 SMD, 74F862

Table of contents:
Info of 74F85
Info of 74F86 SMD
Info of 74F862

74F85, 74F86 SMD, 74F862 Selling Leads, Datasheet

MFG:S Package Cooled:DIP D/C:2007+

74F85, 74F86 SMD, 74F862 Datasheet download

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Part Number: 74F85

MFG: S

Package Cooled: DIP

D/C: 2007+

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74F85 General Description

The 74F85 is a 4-bit magnitude comparator that can be expanded to almost any length. It compares two 4-bit binary, BCD, or other monotonic codes and presents the three possible magnitude results at the outputs. The 4-bit inputs are weighted (A0-A3) and (B0-B3) where A3 and B3 are the most significant bits. The operation of the 74F85 is described in the Function Table, showing all possible logic conditions. The upper part of the table describes the normal operation under all conditions that will occur in a single device or in a series expansion scheme. In the upper part of the table the three outputs are mutually exclusive. In the lower part of the table, the outputs reflect the feed-forward conditions that exist in the parallel expansion scheme. The expansion inputs I_A>B, and I_A=B and I_A<B are the least significant bit positions. When used for series expansion, the A>B, A=B and A<B outputs of the lease significant word are connected to the corresponding I_A>B, and I_A=B and I_A<B inputs of the next higher stage. Stages can be added in this manner to any length, but a propagation delay penalty of about 15ns is added with each additional stage. For proper operation, the expansion inputs of the least significant word should be tied as follows:I_A>BLow,I_A=B= High, and I_A<B= Low.

74F85 Maximum Ratings

SYMBOL	PARAMETER	RATING	UNIT
V_CC	Supply voltage	0.5 to +7.0	V
V_IN	Input voltage	0.5 to +7.0	V
I_IN	Input current	30 to +5	mA
V_OUT	Voltage applied to output in High output state	0.5 to +V_CC	V
I_OUT	Current applied to output in Low output state	40	mA
T_amb	Operating free-air temperature range	0 to +70	°C
T_stg	Storage temperature	65 to +150	°C

74F85 Features

*High-impedance NPN base inputs for reduced loading
(20A in High and Low states)
*Magnitude comparison of any binary words
*Serial or parallel expansion without extra gating

74F85 Typical Application

The parallel expansion scheme shown in Figure 1 demonstrates the most efficient general use of these comparators. The expansion inputs can be used as a fifth input bit position except on the least significant device, which must be connected as in the serial scheme.The expansion inputs used by labeling I_A>B as an "A" input, as I_A<B as a "B"input and setting I_A=B= Low. The 74F85 can be used as a 5-bit comparator only when the outputs are used to drive the (A0-A3) an (B0-B3) inputs of another 74F85 device. The parallel technique can be expanded to any number of bits as shown in Table 1.

74F85 Connection Diagram

74F862 General Description

The 74F862 and 74F863 bus transceivers provide high performance bus interface buffering for wide data/address paths of buses carrying parity. The 74F863 9-bit bus transceiver has NOR-ed transmit and receive output enables for maximum control flexibility.

74F862 Maximum Ratings

SYMBOL	PARAMETER	RATING	UNIT
V_CC	Supply voltage	0.5 to +7.0	V
V_IN	Input voltage	0.5 to +7.0	V
I_IN	Input current	30 to +5	mA
V_OUT	Voltage applied to output in High output state	0.5 to +5.5	V
I_OUT	Current applied to output in Low output state	128	mA
T_a	Operating free-air temperature range	0 to +70
T_stg	Storage temperature	65 to +150

74F862 Features

• Provide high performance bus interface buffering for wide data/address paths or buses carrying parity
• High impedance NPN base inputs for reduced loading (20mA in High and Low states)
• IIL is 20mA vs. 1000mA for AM29861 series
• Buffered control inputs for light loading, or increased fan-in as required with MOS microprocessors
• Positive and negative over-shoots are clamped to ground
• 3-State outputs glitch free during power-up and power-down
• Slim dual In-line (DIP) 300mil package
• Broadside pinout compatible with AMD AM2986229863
• Outputs sink 64mA

74F862 Connection Diagram

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