74377: Difference between revisions

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The '''74377'' chip (common variants 74LS377, 74HC3770 is used as a latch in mappers like [[Color Dreams]] and stores eight bits of data.
The '''74377'' chip (common variants 74LS377, 74HC377) is used as a latch in mappers like [[Color Dreams]] and stores eight bits of data.
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       74HC377
       74HC377

Revision as of 00:10, 3 May 2012

The '74377 chip (common variants 74LS377, 74HC377) is used as a latch in mappers like Color Dreams and stores eight bits of data. 

      74HC377
  Octal D flip-flop
     ,---_---.
/WE -| 1   20|- Vcc
 Q0 -| 2   19|- Q7
 D0 -| 3   18|- D7
 D1 -| 4   17|- D6
 Q1 -| 5   16|- Q6
 Q2 -| 6   15|- Q5
 D2 -| 7   14|- D5
 D3 -| 8   13|- D4
 Q3 -| 9   12|- Q4
GND -|10   11|- CLK
     `-------'
  • Vcc: Connect to +5V
  • GND:
  • CLK: Load clock
  • /WE: Write enable
  • D0-7: Inputs, connected to CPU D0-D7
  • Q0-7: Outputs, connected to PRG and CHR ROM address lines

D0-7 are copied to Q0-7 when CLK rises (0 to 1) while /WE is low.

References

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