Philips Semiconductors
Product data sheet
NE1619
HECETA4 Temperature and voltage monitor
2004 Oct 05
14
NAND-tree test
A NAND tree is provided in the NE1619 for Automated Test
Equipment (ATE) board level connectivity testing. The device is
placed into NAND tree test mode by powering up with Pin 9
(D/NTEST_IN) held high. In this test mode Pin 16
(A0/RESET
/NTEST_OUT) becomes the NAND-tree output and all
input pins become NAND-tree inputs as illustrated in Figure 12.
To perform a NAND tree test all pins should be initially driven low.
Then one-by-one toggle them high (and keep them high), starting
with the input closest to the output, cycling toward the farthest, the
NAND tree output will toggle with each input change.
SL01232
SDA
SCL
VID4
VID0
VID1
VID2
VID3
NTEST_OUT
Figure 12. NAND-tree circuitry
Table 9. NAND-tree test vectors
VECTOR #
SDA
SCL
VID0
VID1
VID2
VID3
VID4
NTEST_OUT
1
L
L
L
L
L
L
L
H
2
L
L
L
L
L
L
H
L
3
L
L
L
L
L
H
H
H
4
L
L
L
L
H
H
H
L
5
L
L
L
H
H
H
H
H
6
L
L
H
H
H
H
H
L
7
L
H
H
H
H
H
H
H
8
H
H
H
H
H
H
H
L
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