82C237 Datasheet, PDF (24/25 Pages) Intersil Corporation – CMOS High Performance Programmable DMA Controller

82C237
Timing Waveforms (Continued)
S2
S4
S2
CLK
A0-A7
READ
WRITE
(10)
TASM
(15)
TDCL
VALID
TDCTR
(16)
TRLRHC
(40)
TDCTW
(17)
(10)
TASM
TDCL
(15)
READY
TRS (32)
TRH (31)
TRS (32)
FIGURE 15. COMPRESSED TRANSFER
S4
VALID
TDCTR
(16)
TDCTW
(17)
TRH (31)
V_CC
RESET
IOR OR IOW
(48) TRSTD
(50) TRSTW
(49) TRSTS
FIGURE 16. RESET
AC Test Circuits
OUTPUT FROM
DEVICE UNDER
TEST
V1
R1
TEST POINT
C1*
* Includes STRAY and FIXTURE Capacitance
TEST CONDITION DEFINITION TABLE
PINS
All Outputs Except EOP
EOP
V1
1.7V
V_CC
R1
520Ω
1.6KΩ
C1
100pF
50pF
AC Testing Input, Output Waveforms
VIH + 0.4V
INPUT
1.5V
VIL - 0.4V
1.5V
VOH
VOL
OUTPUT
Z → L OR H
OUTPUT
2.0V
0.8V
VOH
VOL
VOH
L OR H → Z
VO -0.45
0.45
OUTPUT
VOL
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
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