Models: DMCA-21080 and DMCA-21440

Cabling

The maximum cable length from the host system to the HDD plus circuit pattern in the host system shall not exceed 18 inches.

IDE signal connector

The AT/IDE signal connector is designed to mate with dupont part number 69764-044 or equivalent.

Notes:

1. Pin position 20 is left blank for secure connector insertion.
2. Pin 49: When grounded, no-spin-up at POR. When open/pull-up, normal spin-up at POR.

Signal definition

The pin assignments of interface signals are listed as follows:

PIN     Signal      I/O      PIN      Signal      I/O
01     -HRESET       1        02      GND
03      HD07        I/O       04      HD08        I/O
05      HD06        I/O       06      HD09        I/O
07      HD05        I/O       08      HD10        I/O
09      HD04        I/O       10      HD11        I/O
11      HD03        I/O       12      HD12        I/O
13      HD02        I/O       14      HD13        I/O
15      HD01        I/O       16      HD14        I/O
17      HD00        I/O       18      HD15        I/O
19      GND                  (20)     Key
21      DMARQ        O        22      GND
23     -HIOW         I        24      GND
25     -HIOR         I        26      GND
27      HIORDY       O        28      CSEL         I
29     -DMACK        I        30      GND
31      HIRQ         O        32     -HIOCS16      O
33      HA01         I        34     -PDIAG       I/O
35      HA00         I        36      HA02         I
37     -HCSO         I        38     -HCS1         I
39     -DASP        I/O       40      GND
41     +5V Logic    PWR       42     +5V Motor    PWR
42      GND                   44      (Resv)

Notes:

1. "O" designates an output from the drive.
2. "I" designates an input to the drive.
3. "I/O" designates an input/output common.
4. "PWR" designates a power supply to the drive.
5. "(Resv)" designates reserved pins which must be left unconnected.
6. There are two input pins for +5 Volt power supply, "+5V Logic" and "+5V Motor." "+5V Logic" is connected to the internal logic circuits and "+5V Motor" is connected to the spindle motor and motor drive.
   
   It is possible to turn on and off "+5V Logic" by an external switch circuit to reduce power consumption to the least possible. In this mode, a voltage drop out due to the motor spin up current can be reduced by connecting "+5V Motor" line into the system power source directly.
   
   If the above power management option is used, all signal lines that will be electrically active in the host system whle the HDD is disconnected from power line shall be isolated by three-state line drivers. Internal leakage through ESD protection circuit may pull down LPUL (least positive up level) of logic signal below specification.
   
   Use both lines in parallel, for regular HDD applications.