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ATE Contact Test thru Analog Switch. Conventional ATE Contact Test DUT pin is only connected to the ATE on the loadboard Force current -200ua on the DUT.

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Presentation on theme: "ATE Contact Test thru Analog Switch. Conventional ATE Contact Test DUT pin is only connected to the ATE on the loadboard Force current -200ua on the DUT."— Presentation transcript:

1 ATE Contact Test thru Analog Switch

2 Conventional ATE Contact Test DUT pin is only connected to the ATE on the loadboard Force current -200ua on the DUT pin Measure voltage on the DUT pin DUT ATE_CH-xxx DUT pin needs to be connected to the ATE and Support IC as well for other functional testing Use a mechanical relay to switch between ATE and Support IC Force current -200ua on the DUT pin Measure voltage on the DUT pin Rly ATE_CH-xxx DUT Support IC CASE#1CASE#2

3 Relays Advantages –Low contact resistance – ~<0.5 ohms –ATEs can easily control them –Higher bandwidth Issues –Bulky –Expensive –Mounting it and reworking it on the board when surface mounted –Takes real estate on the board

4 Analog Switches Alternate solution to relays are analog switches Pros –Small footprint, one IC can switch many DUT pin –Easy manufacturability and rework –Low cost –High Bandwidth Issues –Higher ON resistance –Pose problem in doing ATE contact test due to their own clamp diodes –Need extra ATE supplies to power them

5 Analog Switches – No Issues Higher ON resistance –With good selection of a switch, this can be tolerated Need extra ATE supplies to power them –Modern ATEs have many power supplies to power the analog switch Pose problem in doing ATE contact test due to their own clamp diodes –This can be alleviated by skewing the power supplies of the switch

6 0v 3.3v ATE_CH-xxx Supporting IC Regular Functional Test With the analog switch supplies at 3.3v/0.0v, the switchs Ain pins will connect to either Aout-A or Aout-B and both the clamp diodes on the switchs pins will act as clamps during functional testing of the DUT thru the ATE or Receiver IC Aout-A Aout-B Ain SEL Regular IO control voltage for Mux control Vil = 0v Vih=3.3v Regular VDD/VSS DUT

7 Contact Test -2v 1.3v ATE_CH-xxx Supporting IC With the analog switch supplies at 1.3v/-2.0v, the switchs Ain pin will be connected to Aout-A and both the clamp diodes of the switchs pins will be reverse biased during contact test of the DUT pins thru the ATE Ain Aout-B Aout-A Skewed IO control voltage for Mux control Vil = -2v Vih=1.3v SEL Skewed VDD/VSS DUT


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