ISD-200 Datasheet, PDF (46/64 Pages) List of Unclassifed Manufacturers – USB Mass Storage Class Bulk-Only Specification Compliant

ISD-200 ASIC Datasheet
External Circuitry
External Components Connection
5.0V 5.0V
1.5ΚΩ
SDA
SCL
ISD-200
USB_ENUM
DPLS
DMNS
1.5KΩ
24Ω
D+
24Ω
D-
Crystal Specifications:
32 pf series capacitance
7 pf load capacitance
Crystals with different specifications
than above will require modified
circuit values for correct operation.
0Ω
12MHz
15pF
15pF
Note for brick powered systems:
System design must insure the 1.5K ohm pull-up
resistor on DPLS does not source power if VBUS
power is not present.
Figure 6 – External Components Connection
IORDY Hookup
The IORDY pin must be pulled up using a 1 K ohm resistor. The figure on the left is used when the ISD-
200 and another device (or devices) is connected to the ATA bus of the drive. The figure on the right is
used when the ISD-200 is the only device connected.
Figure 7 – IORDY Hookup
44
In-System Design Confidential