P R E L I M I N A R Y
SWITCHING CHARACTERISTICS over COMMERCIAL operating range
Write Cycle (20 MHz and 25 MHz)
Preliminary
Parameter
20 MHz
Min
25 MHz
Min Max Unit
No. Symbol
General Timing Responses
Description
Max
3
4
5
6
7
8
9
tCHSV Status Active Delay
0
0
0
0
0
0
25
25
25
25
25
0
0
0
0
0
0
20
20
20
20
20
ns
ns
ns
ns
ns
ns
ns
tCLSH Status Inactive Delay
tCLAV AD Address Valid Delay and BHE
tCLAX Address Hold
tCLDV Data Valid Delay
tCHDX Status Hold Time
tCHLH ALE Active Delay
25
25
20
20
tCLCL–10=
40
tCLCL–10=
30
10
tLHLL
ALE Width
ns
11
12
tCHLL
tAVLL
ALE Inactive Delay
AD Address Valid to ALE Low(a)
ns
ns
tCLCH
tCHCL
tCLCH
tCHCL
AD Address Hold from ALE
Inactive(a)
13
tLLAX
ns
14
16
tAVCH AD Address Valid to Clock High
tCLCSV MCS/PCS Active Delay
0
0
0
0
ns
ns
25
25
20
20
MCS/PCS Hold from Command
17
tCXCSX
tCLCH
tCLCH
ns
Inactive(a)
18
19
20
22
23
tCHCSX MCS/PCS Inactive Delay
tDXDL DEN Inactive to DT/R Low(a)
tCVCTV Control Active Delay 1(b)
tCHCTV Control Active Delay 2
tLHAV ALE High to Address Valid
0
0
0
0
ns
ns
ns
ns
ns
0
25
25
0
20
20
0
0
20
15
Write Cycle Timing Responses
30
31
tCLDOX Data Hold Time
tCVCTX Control Inactive Delay(b)
0
0
0
0
ns
ns
25
20
2tCLCL–10
=90
2tCLCL–10
=70
32
33
34
35
65
67
68
tWLWH WR Pulse Width
ns
ns
ns
ns
ns
ns
ns
ns
tWHLH WR Inactive to ALE High(a)
tWHDX Data Hold after WR(a)
tCLCH–2
tCLCH–2
tCLCL–10=
40
tCLCL–10=
30
tWHDEX WR Inactive to DEN Inactive(a)
tAVWL A Address Valid to WR Low
tCHCSV CLKOUTA High to LCS/UCS Valid
tCLCH–3
tCLCH–3
tCLCL+tCHCL
–3
tCLCL+tCHCL
–3
0
25
25
25
0
20
20
20
CLKOUTA High to A Address
tCHAV
Valid
0
0
87
tAVBL
A Address Valid to WHB, WLB Low
tCHCL–3
tCHCL–3
Notes:
All timing parameters are measured at 1.5 V with 50 pF loading on CLKOUTA unless otherwise noted. All output test conditions
are with CL = 50 pF. For switching tests, VIL = 0.45 V and VIH = 2.4 V, except at X1 where VIH = VCC – 0.5 V.
a
b
Equal loading on referenced pins.
This parameter applies to the DEN, INTA1–INTA0, WR, WHB, and WLB signals.
66
Am186/188EM and Am186/188EMLV Microcontrollers
AMD [ AMD ]
