FlashFlex51 MCU
SST89E564RD / SST89V564RD / SST89E554RC / SST89V554RC
Preliminary Specifications
ALE
PSEN#
WR#
PORT 0
PORT 2
TLHLL
TWHLH
TLLWL
TWLWH
TAVLL
TLLAX
TQVWX
A7-A0 FROM RI or DPL
TAVWL
TQVWH
DATA OUT
P2[7:0] or A15-A8 FROM DPH
TWHQX
A7-A0 FROM PCL
INSTR IN
A15-A8 FROM PCH
555 ILL F29.0
FIGURE 11-8: EXTERNAL DATA MEMORY WRITE CYCLE
TABLE 11-6: EXTERNAL CLOCK DRIVE
Symbol
1/TCLCL
TCHCX
TCLCX
TCLCH
TCHCL
Parameter
Oscillator Frequency
High Time
Low Time
Rise Time
Fall Time
25MHz
Min Max
20
20
Oscillator
40MHz
Variable
Min Max
Min
Max
0
40
0.35TCLCL
0.35TCLCL
10
0.65TCLCL
0.65TCLCL
10
Units
MHz
ns
ns
ns
ns
T11-6.0 555
VDD = -0.5
0.45 V
0.7 VDD
0.2 VDD -0.1
TCHCL
TCLCX
TCHCX
TCLCH
TCLCL
FIGURE 11-9: EXTERNAL CLOCK DRIVE WAVEFORM
555 ILL F30.0
©2001 Silicon Storage Technology, Inc.
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S71207-00-000 9/01 555