AM186EM Datasheet, PDF (76/98 Pages) List of Unclassifed Manufacturers – MICROCONTROLLER BLOCK DIAGRAM

PRELIMINARY
SWITCHING CHARACTERISTICS over COMMERCIAL operating range
PSRAM Refresh Cycle (33 MHz and 40 MHz)
Preliminary
Parameter
33 MHz
40 MHz
No. Symbol
Description
Min
Max
Min
Max Unit
General Timing Responses
9
t_CHLH ALE Active Delay
10
t_LHLL ALE Width
15
t_CLCL – 10 = 20
t_CLCL – 5
= 20
12 ns
ns
11 t_CHLL ALE Inactive Delay
Read/Write Cycle Timing Responses
15
12 ns
25
t_CLRL RD Active Delay
26 t_RLRH RD Pulse Width
0
2t_CLCL – 15
= 45
15
0
10 ns
2t_CLCL – 10
= 40
ns
27 t_CLRH RD Inactive Delay
28
t_RHLH RD Inactive to ALE High^(a)
80 t_CLCLX LCS Inactive Delay
81 t_CLCSL LCS Active Delay
Refresh Timing Cycle Parameters
0
t_CLCH – 3
0
0
15
0
12 ns
t_CLCH – 2
ns
15
0
12 ns
15
0
12 ns
79 t_CLRFD CLKOUTA Low to RFSH Valid
0
82 t_CLRF CLKOUTA High to RFSH Invalid
0
85 t_RFCY RFSH Cycle Time
6 • t_CLCL
86 t_LCRF LCS Inactive to RFSH Active Delay 2t_CLCL –3
15
0
12 ns
15
0
12 ns
6 • t_CLCL
ns
2t_CLCL –1.25
Note:
All timing parameters are measured at 1.5 V with 50 pF loading on CLKOUTA unless otherwise noted. All output test conditions
are with C_L = 50 pF. For switching tests, V_IL = 0.45 V and V_IH = 2.4 V, except at X1 where V_IH = V_CC – 0.5 V.
a Equal loading on referenced pins.
76
Am186/188EM and Am186/188EMLV Microcontrollers