5.4Electrical Characteristics
(1)Input signal level
All inputs are HCMOS level. As the input side is pulled up with a resistance of 3.3 kΩ, 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
| < HOST SIDE > | < PRINTER SIDE > | ||
|
| VCC |
|
|
|
| 3.3k | (HC04 or equivalent) | |
DATA |
|
| ||
|
|
|
|
|
|
|
|
|
|
| VCC |
|
|
| 3.3k | 100 | (HC04 or equivalent) |
STB |
|
| |
|
| 102 | 471 |
| VCC |
|
|
RESET | 3.3k |
| (HC04 or equivalent) |
|
|
| |
|
| 104 |
|
OUTPUT SIGNAL | VCC |
|
|
ACK BUSY P.N.E. | 3.3k |
| (HC04 or equivalent) |
|
|
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