CLC018AJVJQ/NOPB National Semiconductor, CLC018AJVJQ/NOPB Datasheet - Page 11

• Manufacturer Part Number: CLC018AJVJQ/NOPB
• Description: IC CROSSPOINT SWITCH 8X8 64PQFP
• Manufacturer: National Semiconductor

Specifications of CLC018AJVJQ/NOPB

• Function: Crosspoint Switch
• Circuit: 1 x 8:8
• Voltage Supply Source: Dual Supply
• Voltage - Supply, Single/dual (±): ±4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *CLC018AJVJQ; *CLC018AJVJQ/NOPB; CLC018AJVJQ

Operation
EXPANDING THE NUMBER OF INPUT PORTS
Expanding the number of inputs in a switch array is accom-
plished by wire-ORing the outputs together, and TRI-
STATEing the outputs of the CLC018s that do not have their
inputs selected. The output bus should be a controlled im-
pedance transmission line with proper termination. This is
shown in Figure 12. The circuit uses a 1-of-2 decoder with
complemented outputs to control the TRI pins of the
CLC018s in the array. Thus, all CLC018s are programmed
simultaneously, and all of them, except for the one with the
selected input, are placed in the TRI-STATE mode.
(Continued)
FIGURE 11. 8 x 16 Crosspoint Example
11
EXPANDING BOTH INPUTS AND OUTPUTS
To increase both the number of inputs and outputs in an
array, apply both the input port and output port expansion
techniques simultaneously. In Figure 13, this is shown for the
case of a 24 input by 32 output switch array. Note that both
input and output busses need to be controlled impedance
transmission lines. The CS pins for rows of CLC018s are
connected together and become the row select inputs,
whereas the TRI pins are connected together for the col-
umns of CLC018s and become the column select pins.
10008820
www.national.com