SST89E554 SST [Silicon Storage Technology, Inc], SST89E554 Datasheet - Page 52

• Manufacturer Part Number: SST89E554
• Description: FlashFlex51 MCU
• Manufacturer: SST [Silicon Storage Technology, Inc]

TABLE 10-5: AC E
10.5 AC Characteristics
Explanation of Symbols Each timing symbol has 5 characters. The first character is always a ‘T’ (stands for
time). The other characters, depending on their positions, stand for the name of a signal or the logical status of that
signal. The following is a list of all the characters and what they stand for.
For example:
©2001 Silicon Storage Technology, Inc.
Symbol
T
T
T
QVWH
RLAZ
WHLH
FIGURE 10-5: AC T
AC Inputs during testing are driven at V IHT (V DD -0.5V) for Logic "1" and
V ILT (0.45V) for a Logic "0". Measurement reference points for inputs and
outputs are at V HT (0.2V DD + 0.9) and V LT (0.2V DD - 0.1)
T
T
A: Address
C: Clock
D: Input data
H: Logic level HIGH
I:
L: Logic level LOW or ALE
P: PSEN#
AVLL
LLPL
V IHT
V ILT
Instruction (program memory contents)
= Time from Address Valid to ALE Low
= Time from ALE Low to PSEN# Low
Parameter
Data Valid to WR# High
RD# to WR# High to ALE High
T
RD# Low to Address Float
amb
LECTRICAL
= 0°C
V HT
V LT
ESTING
TO
+70°C
C
I
NPUT
HARACTERISTICS
Note: V HT - V HIGH Test
/O
OR
V LT - V LOW Test
V IHT -V INPUT HIGH Test
V ILT - V INPUT LOW Test
UTPUT
-40°C
SST89E564 / SST89V564 / SST89E554 / SST89V554
Min
433
384 ILL F28a.2
43
25MHz
, F
TO
Max
123
LOAT
0
(C
+85°C, V
ONTINUED
Min
125
10
W
40MHz
52
AVEFORM
Max
40
DD
0
For timing purposes a port pin is no longer floating when a 100 mV
change from load voltage occurs, and begins to float when a 100 mV
change from the loaded V OH /V OL level occurs. I OL /I OH = ± 20mA.
Q: Output data
R: RD# signal
T: Time
V: Valid
W: WR# signal
X: No longer a valid logic level
Z: High Impedance (Float)
) (2
V LOAD
= 2.7-3.6 @25MH
V LOAD +0.1V
V LOAD -0.1V
OF
7T
7T
T
T
CLCL
CLCL
CLCL
CLCL
2)
Oscillator
Min
- 25 (3V)
- 15 (5V)
- 70 (3V)
- 50 (5V)
Timing Reference
Variable
Z
, 4.5-5.5 @ 40MH
Points
Preliminary Specifications
T
T
FlashFlex51 MCU
CLCL
CLCL
Max
+ 25 (3V)
+ 15 (5V)
0
384 ILL F28b.0
S71181-03-000 9/01
V OH -0.1V
V OL +0.1V
Z
, V
SS
T10-5.5 384
Units
= 0
ns
ns
ns
ns
ns
384