Technical information

CHAPTER 4
Expansion Features
RAM Expansion Slots 73
IMPORTANT
The PowerBook G3 Series computer supports only the
types of SDRAM devices specified in Table 4-7. Other types
of DRAM devices should not be used with this
computer.
▲
RAM SO-DIMM Electrical Limits 4
Each RAM SO-DIMM must not exceed the following maximum current limits
on the +3 V supply:
Active 1.2 A (8 devices at 150 mA each)
Sleep 6 mA per bank
The maximum current specified for active operation generally rules out the use
of 4-bit-wide SDRAM devices in a RAM expansion card. Such a card would
have 16 such devices, and the 1.2 A maximum current would allow only about
75 mA per device. To stay within the current limits, RAM expansion cards
should use only 8-bit or 16-bit SDRAM devices.
64 Mbits
4M x 4 x 4
12 10
64 Mbits
4M x 8 x 2
13 9
64 Mbits
2M x 8 x 4
12 9
64 Mbits
2M x 16 x 2
13 8
64 Mbits
1M x 16 x 4
12 8
64 Mbits
1M x 32 x 2
13 7
64 Mbits
512K x 32 x 4
12 7
128 Mbits 4M x 8 x 4 13 9
128 Mbits 2M x 16 x 4 13 8
Table 4-7 Types of DRAM devices (continued)
Device size
Device
configuration
Size of
row address
Size of
column
address