P4C148/P4C149
AC TEST CONDITIONS
Input Pulse Levels
Input Rise and Fall Times
Input Timing Reference Level
Output Timing Reference Level
Output Load
GND to 3.0V
3ns
1.5V
1.5V
See Figures 1 and 2
TRUTH TABLE
Mode
Standby
Read
Write
CE
H
L
L
WE
X
H
L
Output
High Z
D
OUT
High Z
Power
Standby
Active
Active
Figure 1. Output Load
* including scope and test fixture.
Figure 2. Thevenin Equivalent
Note:
Due to the ultra-high speed of the P4C148/149, care must be taken
when testing this device; an inadequate setup can cause a normal
functioning part to be rejected as faulty. Long high-inductance leads that
cause supply bounce must be avoided by bringing the V
CC
and ground
planes directly up to the contactor fingers. A 0.01 µF high frequency
capacitor is also required between V
CC
and ground. To avoid signal
reflections, proper termination must be used; for example, a 50Ω test
environment should be terminated into a 50Ω load with 1.73V (Thevenin
Voltage) at the comparator input, and a 116Ω resistor must be used in
series with D
OUT
to match 166Ω (Thevenin Resistance).
Document #
SRAM104
REV B
Page 5 of 10
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