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15
CHAPTER 1 OVERVIEW
Table 1.7-3 I/O circuit type (1/2)
Type Circuit Remarks
A • Crystal oscillator
• Feedback resistor: About 1 MΩ (5 V)
B • CMOS input
• Pull-down resistor (N-ch): About 50 kΩ (5 V)
C • Output pull-up resistor (P-ch): About 50 kΩ (5 V)
• Hysteresis input
D • N-ch open-drain output
• CMOS input
• The segment driver output is optional.
X1
X0
S
P-ch
P-ch
N-ch
N-ch
tandby control signal
N-ch
R
R
P-ch
N-ch
N-ch
P-ch
N-ch
P-ch
N-ch