Line Labels |
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+ | Shift Left (or up) |
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+ | Shift Right (or down) |
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+1 | Count Up |
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- 1 | Count Down |
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Borrow Output |
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=9,+1 | Carry | Output | (Decimal | Counter) |
=15,+1 | Carry | Output | (Binary | Counter) |
An | nth Address Bit (ROM, RAM) | |||
c | Clock Input |
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D | Data or Delay Input | |||
Dn | nth Data Bit Input |
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EN | Enable |
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F | ||||
G | Gating | Input | (See “Dependency”) | |
J |
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K |
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LD | Load Enable Input (Synchronous) | |||
PS | Preset | Input | (Asynchronous) | |
R | Reset or Clear Input |
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R D | Read Enable Input (RAM, ROM) | |||
S | Set Input |
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SEL | Line or Function Select Input | |||
SER | Serial Data Input (Shift Register) | |||
T | Trigger Input | (Monostable) | ||
W R | Write Enable Input (RAM) | |||
Y n | nth Data Bit Output or I/O | |||
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(placed | by |
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function | label) |
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Figure 6. Schematic Symbols for Digital Integrated Circuits (4 of 7)
16 General Information