82C237 Datasheet, PDF (20/25 Pages) Intersil Corporation – CMOS High Performance Programmable DMA Controller

82C237
AC Electrical Specifications
V_CC = +5.0V ±10%, GND = 0V,
TTT_AAA===0--^o_45C05ootoCC
+70^oC (C82C237),
to +85^oC (I82C237),
to +125^oC (M82C237)
(Continued)
82C237
82C237-12
SYMBOL
PARAMETER
MIN
MAX
MIN
MAX
(35)TWRRD
READ HIGH Delay from WRITE HIGH
0
-
5
-
(36)TRLRH
READ Pulse Width, Normal Timing
2TCY-60
-
2TCY-55
-
(37)TSHSL
ADSTB Pulse Width
TCY-50
-
TCY-35
-
(38)TWLWHA
Extended WRITE Pulse Width
2TCY-85
-
2TCY-80
-
(39)TWLWH
WRITE Pulse Width
TCY-85
-
TCY-80
-
(40)TRLRHC
READ Pulse Width, Compressed
TCY-60
-
TCY-55
-
(56)TAVRL
ADR Valid to READ LOW
17
-
17
-
(57)TAVWL
ADR Valid to WRITE LOW
7
-
7
-
(58)TRHAL
READ HIGH to AEN LOW
15
-
15
-
(59)TRHSH
READ HIGH to ADSTB HIGH
13
-
13
-
(60)TWHSH
WRITE HIGH to ADSTB HIGH
15
-
15
-
(61)TDVRL
DACK Valid to READ LOW
25
-
25
-
(62)TDVWL
DACK Valid to WRITE LOW
25
-
25
-
(63)TRHDI
READ HIGH to DACK Inactive
12
-
12
-
(64)TAZRL
ADR Float to READ LOW
-2.5
-
-2.5
-
(65)TOEV
Output Enable Valid Before WRITE HIGH
TCY+20
-
TCY+20
-
(66)TOEH
Output Enable Hold Time from WRITE HIGH
TCY-50
-
TCY-50
-
PERIPHERAL (SLAVE) MODE
(41)TAR
ADR Valid or CS LOW to READ LOW
10
-
0
-
(42)TAWL
ADR Valid to WRITE LOW Setup Time
0
-
0
-
(43)TCWL
CS LOW to WRITE LOW Setup Time
0
-
0
-
(44)TDW
Data Valid to WRITE HIGH Setup Time
100
-
60
-
(45)TRA
ADR or CS Hold from READ HIGH
0
-
0
-
(46)TRDE
Data Access from READ
-
120
-
80
(47)TRDF
DB Float Delay from READ HIGH
5
85
5
55
(48)TRSTD
Power Supply HIGH to RESET LOW Setup Time
500
-
500
-
(49)TRSTS
RESET to First IOR or IOW
2TCY
-
2TCY
-
(50)TRSTW
RESET Pulse Width
300
-
300
-
(51)TRW
READ Pulse Width
155
-
85
-
(52)TWA
ADR from WRITE HIGH Hold Time
0
-
0
-
(53)TWC
CS HIGH from WRITE HIGH Hold Time
0
-
0
-
(54)TWD
Data from WRITE HIGH Hold Time
10
-
10
-
(55)TWWS
WRITE Pulse Width
100
-
45
-
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
4-167