AM186ED Datasheet, PDF (70/88 Pages) Advanced Micro Devices – High Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers

PRELIMINARY
SWITCHING CHARACTERISTICS over COMMERCIAL and INDUSTRIAL operating ranges
DRAM
Preliminary
Parameter
20 MHz
25 MHz
33 MHz
40 MHz
No. Symbol
Description
Min Max Min Max Min Max Min Max Unit
General Timing Responses
101 t_CHCAV CLKOUTA Low to Column
Address Valid
0
25
0
20
0
15
0
12 ns
102 t_CLRA CLKOUTA Low to RAS Active
3
25
3
20
3
15
3
12 ns
103 t_CHRX CLKOUTA High to RAS Inactive
3
25
3
20
3
15
3
12 ns
104 t_CHCA CLKOUTA High to CAS Active
3
25
3
20
3
15
3
12 ns
105 t_CLCX CLKOUTA Low to CAS Inactive
3
25
3
20
3
15
3
12 ns
106 t_CHRA CLKOUTA High to RAS Active
3
25
3
20
3
15
3
12 ns
107 t_CLRX CLKOUTA Low to RAS Inactive
3
25
3
20
3
15
3
12 ns
108 t_RP0W RAS Inactive Pulse Width with 0
60
—
50
—
40
—
30
—
ns
Wait States
109 t_RP1W RAS Inactive Pulse Width with 1 or 70
—
60
—
50
—
40
—
ns
More Wait States
110 t_RD0W RAS To Column Address Delay
Time with 0 Wait States
25 — 20 — 15 — 15 — ns
111 t_RD1W RAS to Column Address Delay
30 — 25 — 20 — 15 — ns
Time with 1 or More Wait States
T _{As guaranteed by design, the following table shows the minimum time for RAS assertion to RAS assertion. These}
minimums correlate to DRAM spec t_RC.
F _{40 MHz}
33 MHz
25 MHz
D ^{R A 20MHz}
Wait States
0
1
2
3
90
110
130
150
110
130
150
170
130
150
170
190
150
170
190
210
70
Am186ED/EDLV Microcontrollers