MAX14500 Datasheet, PDF (1/41 Pages) Maxim Integrated Products – Hi-Speed USB-to-SD Card Readers with Bypass

19-4117; Rev 1; 4/09
EVAALVUAAILTAIOBNLEKIT
Hi-Speed USB-to-SD Card
Readers with Bypass
General Description
The MAX14500–MAX14503 USB-to-SD™ card readers
provide a means for portable devices that support full-
speed USB communication (12Mbps) with one or two
SD card slots, upgrading the USB SD card reader func-
tion to USB Hi-Speed (480Mbps) operation. The
MAX14500–MAX14503 have two modes of operation:
Pass Thru and Card Reader. In pass thru, the SD and
USB signals pass through the MAX14500–MAX14503
without modification, appearing like the device is not
present. The host microprocessor firmware does not
need modification, as there is no change from the host
microprocessor’s perspective. In Card Reader mode,
the MAX14500–MAX14503 implement a Hi-Speed USB
card reader that operates independently of the host
microprocessor. All the capabilities of the full-speed
USB port and SD card slot are preserved with the addi-
tional feature that allows a faster way for a PC to read or
write to the SD card. The MAX14500–MAX14503 sup-
port SD high capacity SDHC cards. The 40-pin TQFN
version supports one SD card, while the 56-bump WLP
version supports two SD cards.
The MAX14500–MAX14503 feature advanced power-
saving modes to reduce power consumption in
portable applications. The low-power Sleep modes
allow the ability to disable internal circuit blocks, pro-
viding power-saving operating modes. The default
clock input for each part number is specified in the
ordering information. The MAX14500–MAX14503 fea-
ture the option to change the default values using the
I²C interface.
The MAX14500–MAX14503 are available in 5mm x
5mm, 40-pin TQFN, and 3.23mm x 3.5mm, 56-bump
WLP packages. These devices operate over a wide
supply voltage range and are specified over the -40°C
to +85°C extended temperature range.
Cell Phones
PDAs
MP3 Players
Digital Still Cameras
GPS
Applications
Features
♦ USB 2.0 Hi-Speed and Full-Speed Compliant
♦ SDHC Card Support
♦ Internal Hi-Speed USB SD Card Reader Eases
Host µP Overhead
♦ On-Chip Termination and Pullup Resistors
♦ Internal SD Switches Allow For Multiplexing Two
SD Cards on a Single-Microprocessor SD Port
♦ Accommodates Clock Input Frequencies
26MHz, 19.2MHz, 13MHz, and 12MHz
♦ Internal Clock Squarer for Low-Amplitude TCXO
Signals
♦ No Power-Supply Sequencing Required
♦ Compatible with +1.8V to +3.3V I/O Host
Microprocessor
♦ Simple Control Mode Requires Only a Single
GPIO
♦ I²C Control Provides Multiple Configuration
Options
♦ I²C Control Required for Two SD Cards
♦ On-Chip Power-On Reset/Brown-Out Reset
Ordering Information/
Selector Guide
PART
INPUT
FREQUENCY
(MHz)
SD
CARDS
PIN-
PACKAGE
MAX14500ETL+*
12
1 40 TQFN-EP**
MAX14500AEWN+*
12
2
56 WLP
MAX14501ETL+*
13
1 40 TQFN-EP**
MAX14501AEWN+*
13
2
56 WLP
MAX14502AETL+
19.2
1 40 TQFN-EP**
MAX14502AEWN+*
19.2
2
56 WLP
MAX14503ETL+*
26
1 40 TQFN-EP**
MAX14503AEWN+*
26
2
56 WLP
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
**EP = Exposed pad.
SD is a trademark of the SD Card Association.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.