TI SN74LS85D

幅值比较器4.75V ~ 5.25V0°C ~ 70°C

Overview

These four-bit magnitued comparators perform comparison of straight binary and straight BCD (8-4-2-1) codes.

These four-bit magnitude comparators perform comparison of straight binary and straight BCD (8-4-2-1) codes. Three fully decoded decisions about two 4-bit words (A, B) are made and are externally available at three outputs. These devices are fully expandable to any number of bits without external gates. Words of greater length may be compared by connecting comparators in cascade. The A > B, A < B, and A = B outputs of a stage handling less-significant bits are connected to the corresponding A > B, A < B, and A = B inputs of the next stage handling more-significant bits. The stage handling the least-significant bits must have a high-level voltage applied to the A = B input. The cascading paths of the '85, 'LS85, and 'S85 are implemented with only a two-gate-level delay to reduce overall comparison times for long words. An alternate method of cascading which further reduces the comparison time is shown in the typical application data.

Features

74LS Series
16-SOIC (0.154, 3.90mm Width) package
4 Bits
74LS series
16 terminations
1 Functions
16 pin count
5V power supplies

Surface Mount Mounting Type

Applications

There are a lot of Texas Instruments
SN74LS85D applications of comparators.

• Communications digltal frequency synthesizers: VHF, UHF, FM, AM, etc.
• Fixed or programmable irequency division
• “Time out" timer for consume-appication industrial controls
• Companion Appliceation Nole, ICAN-6374, "Application of the CMOS CD4059A Programmable Divide-by-N Counter in FM and Ctizens Band Transceiver Digital Tuners"
• Servo motor controls
• Process contollenr
• Servo Motor Controls