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LS7166 Datasheet(PDF) 1 Page - LSI Computer Systems |
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LS7166 Datasheet(HTML) 1 Page - LSI Computer Systems |
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1 / 19 page  24-BIT QUADRATURE COUNTER FEATURES: • Programmable modes are: Up/Down, Binary, BCD, 24 Hour Clock, Divide-by-N, x1 or x2 or x4 Quadrature and Single-Cycle. • DC to 25MHz Count Frequency. • 8-Bit I/O Bus for uP Communication and Control. • 24-Bit comparator for pre-set count comparison. • Readable status register. • Input/Output TTL and CMOS compatible. • 3V to 5.5V operation (VDD - VSS). • LS7166 (DIP); LS7166-S (SOIC); LS7166-TS24 (24-Pin TSSOP) - See Figure 1 - GENERAL DESCRIPTION: The LS7166 is a CMOS, 24-bit counter that can be pro- grammed to operate in several different modes. The oper- ating mode is set up by writing control words into internal control registers (see Figure 8). There are three 6-bit and one 2-bit control registers for setting up the circuit functional characteristics. In addition to the control registers, there is a 5-bit output status register (OSR) that indicates the current counter status. The IC communicates with external circuits through an 8-bit three state I/O bus. Control and data words are written into the LS7166 through the bus. In addition to the I/O bus, there are a number of discrete inputs and out- puts to facilitate instantaneous hardware based control func- tions and instantaneous status indication. REGISTER DESCRIPTION: Internal hardware registers are accessible through the I/O bus (D0 - D7) for READ or WRITE when CS = 0. The C/D in- put selects between the control registers (C/D = 1) and the data registers (C/D = 0) during a READ or WRITE operation. (See Table 1) The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use. December 2008 FIGURE 1 LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 LS7166 PIN ASSIGNMENTS - Top View 7166-121508-1 20-PIN DIP and SOIC LCTR/LLTC ABGT/RCTR 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 D1 D2 D3 D4 D5 D6 D7 CY BW C/D RD VSS ( -V ) WR CS VDD ( +V) A B D0 24-PIN TSSOP 1 2 3 4 5 6 7 8 9 15 16 17 18 19 20 21 22 23 24 12 CS WR NC NC NC A LCTR/LLTC ABGT/RCTR B D0 D1 D2 VSS (-V) D3 D4 D5 D6 D7 NC VDD ( +V) C/D RD BW CY 11 10 13 14 UL ® A3800 |
Número de pieza similar - LS7166_08 |
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Descripción similar - LS7166_08 |
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