LC895127 Datasheet, PDF (6/8 Pages) Sanyo Semicon Device – 40 x CD-ROM Decoder with SCSI Interface

LC895127, 895127K
Continued from preceding page.
Pin No.
Pin
I/O
Function
108
V_SS1
109
V_DD
110
V_SS0
111
RAS0
P
P
P
O
Buffer RAM RAS signal output 0
112
V_DD
113
CAS0
P
O
Buffer RAM CAS signal output 0 (Normally held fixed at 0 (low).)
114
CAS1
O
Buffer RAM RAS 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.
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