Data Sheet
FlashFlex51 MCU
SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD
SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD
71
©2006 Silicon Storage Technology, Inc. S71255-05-000 5/06
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:
T
AVLL
= Time from Address Valid to ALE Low
T
LLPL
= Time from ALE Low to PSEN# Low
T
WHQX
Data Hold After WR#
3T
CLCL
- 27 (3V) ns
5T
CLCL
- 20 (5V) ns
T
QVWH
Data Valid to WR# High
142 7T
CLCL
- 70 (3V) ns
125 7T
CLCL
- 50 (5V) ns
T
QVWX
Data Valid to WR# High to Low
Transition
10 5 T
CLCL
- 20 ns
T
RLAZ
RD# Low to Address Float 0 0 0 ns
T
WHLH
RD# to WR# High to ALE High 5 55 T
CLCL
- 25 (3V) T
CLCL
+ 25 (3V) ns
10 40 T
CLCL
- 15 (5V) T
CLCL
+ 15 (5V) ns
T14-8.0 1255
1. Calculated values are for x1 Mode only
A: Address Q: Output data
C: Clock R: RD# signal
D: Input data T: Time
H: Logic level HIGH V: Valid
I: Instruction (program memory contents) W: WR# signal
L: Logic level LOW or ALE X: No longer a valid logic level
P: PSEN# Z: High Impedance (Float)
TABLE 14-8: AC Electrical Characteristics (Continued) (2 of 2)
T
A
= -40°C to +85°C, V
DD
= 2.7-3.6V@33MHz, 4.5-5.5V@40MHz, V
SS
= 0V
Symbol Parameter
Oscillator
Units
33 MHz (x1 Mode)
16 MHz (x2 Mode)
1
40 MHz (x1 Mode)
20 MHz (x2 Mode)
1
Variable
Min Max Min Max Min Max
