82C237
Timing Waveforms (Continued)
S2
S4
S2
S4
CLK
A0-A7
READ
(10)
(10)
TASM
TASM
VALID
TDCTR
VALID
(15)
TDCL
TDCL
(15)
TDCTR
(16)
(16)
TRLRHC
(40)
TDCTW
(17)
TDCTW
(17)
WRITE
READY
TRH (31)
TRH (31)
TRS (32)
TRS (32)
FIGURE 15. COMPRESSED TRANSFER
(48) TRSTD
(50) TRSTW
V
CC
RESET
(49) TRSTS
IOR OR IOW
FIGURE 16. RESET
AC Test Circuits
AC Testing Input, Output Waveforms
V1
R1
VIH + 0.4V
VOH
INPUT
OUTPUT
1.5V
1.5V
VIL - 0.4V
VOL
OUTPUT FROM
DEVICE UNDER
TEST
TEST POINT
C1*
Z → L OR H
L OR H → Z
VOH
VOL
VOH
VO -0.45
0.45
2.0V
0.8V
OUTPUT
OUTPUT
VOL
* Includes STRAY and FIXTURE Capacitance
TEST CONDITION DEFINITION TABLE
NOTE: AC Testing: All AC Parameters tested as per test circuits. In-
put RISE and FALL times are driven at Ins/V. CLK input must
switch between VIHC +0.4V and VILC -0.4V
PINS
All Outputs Except EOP
EOP
V1
R1
C1
1.7V
520Ω
1.6KΩ
100pF
50pF
V
CC
4-171
INTERSIL [ Intersil ]
