Intel 8253 - Page 677

4-17
AC Test Circuit
AC Testing Input, Output Waveform
TEST CONDITION DEFINITION TABLE
TEST
CONDITION V
1
R
1
R
2
C
1
1 1.7V 523Ω Open 100pF
2V
CC
1.8kΩ 1.8kΩ 50pF
V
1
R
1
R
2
C
1
(NOTE)
OUTPUT FROM
DEVICE UNDER
TEST
TEST
POINT
NOTE: Includes stray and jig capacitance.
Timing Waveforms
FIGURE 12. WRITE
INPUT
V
IH
+0.4V
V
IL
- 0.4V
1.5V
V
OH
OUTPUT
V
OL
1.5V
NOTE: AC Testing: All input signals must switch between V
IL
- 0.4V and V
IH
+ 0.4V. Input rise and fall times are driven at 1ns/V.
WR
CS
ADDRESS BUS
A
0
DATA BUS
(7)
TDVWH
(8)
TWHDX
(4)
TAHWL
(5)
TWHAX
(6)
TWLWH
82C59A