Datasheet

Transition Socket Specification
DS51194S-page 16  2010 Microchip Technology Inc.
PLCC TRANSITION SOCKET
A PLCC transition socket and associated hardware is
shown in Figure 3.
FIGURE 3: PLCC TRANSITION SOCKET
The PLCC transition socket is required for use along
with the PLCC device adapters. The DAF18-1 device
adapter is equipped with eight socket strips that inter-
face with one of two transition sockets. The DAF18-3
device adapter is equipped with four socket strips that
interface with one transition socket.
The PLCC transition sockets are designed with a
threaded insert in the center of the footprint so that a
4/40 screw can securely fasten the transition socket to
the device adapter.
The PLCC transition sockets are designed to be sol-
dered to the target PCB PLCC surface mount pattern or
inserted into a PLCC socket on the target PCB.
Microchip offers the following PLCC transition sockets:
• XLT44L2: One 44-lead PLCC transition socket
RECOMMENDED PCB LAYOUT
XLT44L2
44-lead PLCC (0.050”)
Note: To avoid solder bridging, do not place vias
within 0.025-inch of the PLCC footprint.
Also, any vias near the PLCC should be
directly on the centerline of the pad.
Cable to Processor Module
PLCC Device Adapter
PLCC Transition Socket
Target/Application Board
0.865”
0.024”
0.050”
0.074”
27.94mm [1.100”]
TOP VIEW
*Caution: Pin 1 on the device adapter side (top of socket)
is 180 degrees from pin 1 on the target side (bottom of
socket).
VIEW
FRONT/SIDE
27.94mm
[1.100”]
2.79mmx45° [0.110”]
20.32mm
[0.800”]
1.27mm typ. [0.050”]
1.27mm typ. [0.050”]
0.43mm typ. [0.017”]
21.93mm
[0.863”]
14.94mm
[0.588”]