Citizen Systems Compact desk-top dot matrix printer CBM-910 Type II - Manual (Page 29)

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DATA
VCC
3.3k
< HOST SIDE > < PRINTER SIDE >
(HC04 or equivalent)
STB
ACK BUSY P.N.E.
OUTPUT SIGNAL
RESET
VCC
3.3k
100
102 471
(HC04 or equivalent)
VCC
3.3k
104
(HC04 or equivalent)
VCC
3.3k (HC04 or equivalent)
5.4 Electrical Characteristics
(1) Input signal level
All inputs are HCMOS level. As the input side is pulled up with a resistance of 3.3
k
Ω, it can be used at TTL level.
TTL Level HCMOS Level
“HIGH” level: 2.0 V MIN “HIGH” level: 4.0 V MIN
“LOW” level: 0.8 V MAX “LOW” level: 1.0 V MAX
(2) Output signal level
Output signal level is held at TTL.
(3) I/O conditions