UPD75518 NEC, UPD75518 Datasheet - Page 10

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

10
1.3 PIN INPUT/OUTPUT CIRCUITS
Type A
Type B
Type B - C
Fig. 1-1 shows the input/output circuit of each PD75518(A) pin in a simplified manner.
IN
IN
IN
P-ch
Schmitt trigger input with hysteresis
Schmitt trigger input with hysteresis
V
DD
P.U.R.
P.U.R.: Pull-Up Resistor
CMOS input buffer
V
DD
P-ch
N-ch
Fig. 1-1 Pin Input/Output Circuits (1/3)
P.U.R.
enable
Type E - B
Type E
Type D
Push-pull output which can be set to high-impedance output
(off for both P-ch and N-ch)
Data
Output
disable
Output
disable
Data
Output
disable
Data
Output
disable
I/O circuit consisting of a push-pull output
of type D and an input buffer of type A
P.U.R.: Pull-Up Resistor
Type D
Type D
Type A
Type A
V
DD
V
DD
P-ch
N-ch
P.U.R.
P-ch
PD75518(A)
IN/OUT
IN/OUT
OUT