LC897127K Datasheet, PDF (7/14 Pages) Sanyo Semicon Device – SCSI CD-ROM Decoder with On-Chip DVD Interface

LC897127K
Continued from preceding page.
Pin No.
Pin
Type
Function
108
V_SS1
109
V_DD
110
V_SS0
111
RAS0
P
P
P
O
Buffer RAM RAS signal output 0
112
DVDSEL
113
CAS0
P
V_SS0 selects the DVD interface and V_DD selects the I/O port function.
O
Buffer RAM CAS signal output 0 (Normally fixed at 0 (low).)
114
CAS1
O
Buffer RAM CAS signal output 1
115
OE
O
Buffer RAM output enable
116
UWE(RA9)
O
Buffer RAM upper write enable (RA9 when 8M or more DRAM is used.)
117
LWE
O
Buffer RAM lower write enable
118
V_SS0
P
119
RA0
O
120
RA1
O
121
RA2
O
122
RA3
O
Buffer RAM address signal outputs
123
RA4
O
124
RA5
O
125
RA6
O
126
V_DD
127
V_SS0
128
RA7
129
RA8
P
P
O
Buffer RAM address signal outputs
O
130
IO15
B
131
IO14
B
132
IO13
B
133
IO12
B
Buffer RAM data I/O.
134
IO11
B
These pins have built-in pull-up resistors.
135
IO10
B
136
IO9
B
137
IO8
B
138
V_SS0
P
139
IO7
B
140
IO6
141
IO5
142
IO4
B
Buffer RAM data I/O.
B
These pins have built-in pull-up resistors.
B
143
IO3
B
144
V_DD
P
• Unused ("NC") pins must be left open.
• Pins whose name is under a bar operate with inverted (negative) logic.
• V_SS0 is the logic system ground and V_SS1 is the SCSI interface driver ground.
• If DRAM is used, applications must adopt measures to prevent undershoot and other DRAM problems. Such measures include inserting resistors in the
RAS and CAS lines and inserting capacitors between V_SS pins. See the article on Designing with the Latest Microcontrollers and Memory in special issue
number 25 of Transistor Technology for details on these measures.
• Since this device includes buffers that sink a current of 48 mA, applications must take adequate noise prevention measures.
No. 6251-7/14