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LS7166 Datasheet(PDF) 5 Page - LSI Computer Systems |
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LS7166 Datasheet(HTML) 5 Page - LSI Computer Systems |
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5 / 19 page  DC Electrical Characteristics. (All voltages referenced to VSS. TA = 0˚ to 85˚C, VDD = 3V to 5.5V, fc = 0, unless otherwise specified) Parameter Symbol Min. Value Max.Value Unit Remarks Supply Voltage VDD 3.0 5.5 V - Supply Current IDD - 350 µA Outputs open Input Low Voltage VIL 0 0.8 V - Input High Voltage VIH 2.0 VDD V - Output Low Voltage VOL - 0.4 V 4mA Sink, VDD = 5V Output High Voltage VOH 2.5 - V 200µA Source, VDD = 5V Input Current - - 15 nA Leakage Current Output Source Current ISRC 200 - µA VOH = 2.5V, VDD = 5V Output Sink Current ISINK 4 - mA VOL = 0.4V, VDD = 5V Data Bus Off-State Leakage Current - - 15 nA - Absolute Maximum Ratings: Parameter Symbol Values Unit Voltage at any input VIN VSS - 0.3 to VDD + 0.3 V Operating Temperature TA -40 to +125 oC Storage Temperature TSTG -65 to +150 oC Supply Voltage VDD - VSS +7.0 V 7166-082906-5 I/O DESCRIPTION: (See REGISTER DESCRIPTION for I/O Prgramming.) Data-Bus (D0 - D7) (Pin 8 - Pin 15). The 8-line data bus is a three-state I/O bus for interfacing with the system bus. CS (Chip Select Input) (Pin 2). A logical "0" at this input enables the chip for Read and Write. RD (Read Input) (Pin 19). A logical "0" at this input enables the OSR and the OL to be read on the data bus. WR (Write Input) (Pin 1). A logical "0" at this input enables the data bus to be written into the control and data registers. C/D (Control/Data Input) (Pin 18). A logical "1" at this input en- ables a control word to be written into one of the four control reg- isters or the OSR to be read on the I/O bus. A logical "0" enables a data word to be written into the PR, or the OL to be read on the I/O bus. A (Pin 6). Input A is a programmable count input capable of functioning in three different modes, such as up count input, down count input and quadrature input. In non-quadrature mode, the counter advances on the rising edge of Input A B (Pin 7). Input B is also a programmable count input that can be programmed to function either as down count input, or count direction control gate for input A, or quadrature input. In non- quad- rature mode, and when programmed as the Down Count input, the counter advances on the rising edge of Input B. When B is pro- grammed as the count direction control gate, B = 0 enables A as the Up Count input and B = 1 enables A as the Down Count input. When programmed as the direction input, B can switch state only when A is high. ABGT/RCTR (Pin 4). This input can be programmed to function as either inputs A and B enable gate or as external counter reset input. A logical "0" is the active level on this input. In non- quadrature mode, if Pin 4 is programmed as A and B enable gate input, it may switch state only when A is high (if A is clock and B is direction) or when both A and B are high (if A and B are clocks). In quadrature mode, if Pin 4 is programmed as A and B enable gate, it may switch state only when either A or B switches. LCTR/LLTC (Pin 3) This input can be programmed to function as the external load command input for either the CNTR or the OL. When programmed as counter load input, the counter is loaded with the data contained in the PR. When programmed as the OL load input, the OL is loaded with data contained in the CNTR. A logical "0" is the active level on this input. CY (Pin 16) This output can be programmed to serve as one of the following: A. CY. Complemented Carry out (active "0"). B. CY. True Carry out (active "1"). C. CYT. Carry Toggle flip-flop out. D. COMP. Comparator out (active "0") BW (Pin 17) This output can be programmed to serve as one of the following: A. BW. Complemented Borrow out (active "0"). B. BW. True Borrow out (active "1"). C. BWT. Borrow Toggle flip-flop out. D. COMPT. Comparator Toggle output. VDD (Pin 5) Supply voltage positive terminal. VSS (Pin 20) Supply voltage negative terminal. |
Número de pieza similar - LS7166_08 |
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Descripción similar - LS7166_08 |
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