{{tag>collection_pbx vendor_dec type_unknown year_1981 foundry_unknown}}
VAX-11/750 DC615 ALK Arithmetic & Logic Processor Control chip

This is a DEC chip and as such is known under multiple IDs:
<code>
Schematic        : ALK
Schematic        : DC615B
Package          : 615B
Package          : 19-14689-00
Bill of Materials: 1914689-00
</code>

Implements extended control functions for the ALP chip, including the multiply/divide state machines.

Built on the DC600 gate array, providing 400 4-input STTL NAND gates.

Technology specifications per EK-KA750-TD-002 (CPU Technical Description):
<code>
    Implementation Technique - Gate Arrays
    Circuit Technology       - Low-Power Bipolar Schottky
    Circuit Density          - Large Scale Integration (LSI)
    
    Die Size                 - .215 in x .244 in
    Power Utilized per Die   - 2 W max
    Package Size             - 1.44 in2 (2.4 in x 0.6 in)
    I/O Circuits per Die     - 44 I/O transceiver gates
    Logic Gates              - 400 identical 4-input NAND gates
    Voltage Used             - 2.5V, 5.0V
    Speed per Gate           - 5 - 10 ns
</code>

====== Package ======

{{:pbx:dec:dc615:pack_top.jpg?300|}}

<code>
615B
19-14689-00
</code>

{{:pbx:dec:dc615:pack_btm.jpg?300|}}

<code>
</code>

The package is an odd pinless version of a 48-pin sidebraze CERDIP.
In the machine the die faces towards the PCB and a heatsink is attached to the top of the package (facing the back of die).

{{:pbx:dec:dc613:pack_perspective.jpg?300|}}


====== Die ======

<code>
DC600
DC615

XSC2594A
</code>


{{https://siliconpr0n.org/map/dec/dc615/single/dec_dc615_pbx_mz_neo10.thumb.jpg}}

[[https://siliconpr0n.org/map/dec/dc615/pbx_mz_neo10/|mz_neo10]]

  * [[https://siliconpr0n.org/map/dec/dc615/single/dec_dc615_pbx_mz_neo10.jpg|Single]] (15548x13690, 192.525MiB)