An RS-MMC (Reduced Size MultiMediaCard) is roughly
half the size (18
x 24 x 1.4 mm) of a (full size) MultiMediaCard
(32 x 24 x 1.4 mm).
They both have the same electrical characteristics and
the same pin assignments. The
can be used like a MultiMediaCard with
the help of an extender.
A typical application is a memory expansion
for mobile phones or digital cameras.
What are MultiMediaCards?
The MultiMediaCard Standard was jointly developed in 1997 by SanDisk
and Siemens (now Infineon) to allow miniaturization of digital equipment
and to provide exchangeable storage media for small mobile devices.
The MultiMediaCard was then further developed to the
The MultiMediaCard (32 x 24 x 1.4 mm) has the same footprint
as the SD Card (2.1 mm height) but is 0.7 mm thinner
and has 7 instead of 9 pins.
It uses the same flash technology as CompactFlash and
PC Cards, but the data is transferred serially rather
than the parallel data transfer used by the ATA protocol.
above: SanDisk RS-MMC 32 MB with extender
right: RS-MMC product family with extender
top right: SanDisk RS-MMC 1 GB
Versions (with Item number)
32 MB SanDisk RS-MMC
altec Item no.: 19SD32
SanDisk Item no.: SDMRJ-32
altec Item no.: 19SD64
SanDisk Item no.: SDMRJ-64
128 MB SanDisk RS-MMC
altec Item no.: 19SD128
SanDisk Item no.: SDMRJ-128
256 MB SanDisk RS-MMC
altec Item no.: 19SD256
SanDisk Item no.: SDMRJ-256
512 MB SanDisk RS-MMC
altec Item no.: 19SD512
SanDisk Item no.: SDMRJ-512
1,0 GB SanDisk RS-MMC
altec Item no.: 19SD1024
SanDisk Item no.: SDMRJ-1024