Samsung ML-920 Service Manual page 152

CIRCUIT DESCRIPTION
Name Pins Level
RAMWR I L
RD 1 L
RD [7:0] 8 H
RE [1:0] 2 L
RESET 1 L
TESTIN 1 H
TESTOUT 1 H
VDD 22 N/A
VDDBIAS 1 N/A
WR 1 L
• I : Input
• O : Output
• 3S : Tri-state output
• OD : Open drain output
• P : Power supply
Combinations indicate bidirectional pins.
An "H" in the Resistor column indicates the pad has an internal pull-up resistor. A tilde (~) indicates no internal resistor.
Repair Manual
3-22
Resistor Type Abbreviation/Description
~ I RAM Write Enable
~ I Command Port Read
H 1/3S RAM Data
~ O RAM Enable
H I Chip Reset
~ I Test Input
O Manufacturing Test Output
~ P Power Supply Source
Input Reference Voltge
~ I Command Port Write
< Pin Classification and Loading >
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Cap. Current(mA)
(pF) Vol Voh
50 4 4
~ ~ ~
50 4 4
50 4 4
~ ~ ~
~ ~ ~
~ ~ ~
~ ~ ~
~ ~ ~
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