2009 - 2015 Microchip Technology Inc. DS00002005A-page 4
USB2250/50i/51/51i
1.0 INTRODUCTION
The Microchip USB2250/50i/51/51i is a flash media card reader solution fully compliant with the USB 2.0 specification.
All required resistors on the USB ports are integrated into the device. This includes all series termination resistors on
D+ and D– pins and all required pull-down and pull-up resistors. The over-current sense inputs for the downstream fac-
ing ports have internal pull-up resistors.
Hardware Features
• Single chip flash media controller
• USB2250/USB2251 supports the commercial temperature range of 0°C to +70°C
• USB2250i/USB2251i supports the industrial temperature range of -40°C to +85°C
• 8051 8-bit microprocessor
- 60 MHz - single cycle execution
- 64 KB ROM |14 KB RAM
• Integrated regulator for 1.8 V core operation
• Flash Media Card Specification Revision Compliance
• Compact Flash 4.1
- CF UDMA Modes 0-4
- CF PIO Modes 0-6
• Secure Digital 2.0
- HS-SD and HC-SD
- TransFlash™ and reduced form factor media
• MultiMediaCard 4.2
- 1/4/8 bit MMC
• Memory Stick 1.43
• Memory Stick Pro Format 1.02
• Memory Stick Pro-HG Duo Format 1.01
- Memory Stick, MS Duo, HS-MS, MS Pro-HG, MS Pro
• Memory Stick Duo 1.10
• Smart Media 1.3
• xD-Picture Card 1.2
Software Features
• If the OEM is using an external EEPROM, the following features are available:
- Customizable vendor, product, and device ID’s
- 12-hex digits maximum for the serial number string
- 28-character manufacturer ID and product strings for the flash media reader/writer
