USB2251-NU-05 Standard Microsystems (SMSC), USB2251-NU-05 Datasheet - Page 35

• Manufacturer Part Number: USB2251-NU-05
• Description: ULTRA FAST USB 2.0 MULTI-SLOT FLASH MEDI
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2251-NU-05

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Ultra Fast USB 2.0 Multi-Slot Flash Media Controller
Datasheet
SMSC USB2250/50i/51/51i
8.3.1.1
8.3.2
NAME
t1
t2
t3
t4
t5
t6
t7
nRESET
nRESET asserted
Device recovery/stabilization
8051 programs device configuration
USB attach
Host acknowledges attach and signals USB reset
USB idle
Ready to handle requests (with or without data)
VSS
nRESET for EEPROM Configuration
Note: All power supplies must have reached the operating levels mandated in
USB Bus Reset
In response to the upstream port signaling a reset to the device, the device does the following:
1. Sets default address to ‘0’.
2. Sets configuration to: Unconfigured.
3. All transactions are stopped.
4. Processor reinitializes and restarts.
5. All media interfaces are disabled.
Hardware
asserted
reset
Parameters, prior to (or coincident with) the assertion of nRESET.
Stabilization
Recovery/
t1
DESCRIPTION
Device
Figure 8.1 nRESET Timing for EEPROM Mode
Table 8.2 nRESET Timing for EEPROM Mode
Configuration
t2
8051 Sets
Registers
DATASHEET
t4
35
t3
Upstream
Attach
USB
MIN
100
1
USB Reset
recovery
t5
Undefined
TYP
20
t6
Idle
MAX
500
100
50
Revision 2.0 (09-29-09)
5
t7
Chapter 10, DC
completion
response
request
Start
UNITS
msec
msec
msec
msec
msec
μsec
μsec