FlashFlex MCU
SST89E516RD2 / SST89E516RD
SST89V516RD2 / SST89V516RD
Data Sheet
TABLE 14-8: AC Electrical Characteristics (Continued) (2 of 2)
TA = -40°C to +85°C, VDD = 2.7-3.6V@33MHz, 4.5-5.5V@40MHz, VSS = 0V
Oscillator
33 MHz (x1 Mode)
40 MHz (x1 Mode)
16 MHz (x2 Mode)1 20 MHz (x2 Mode)1
Variable
Symbol
Parameter
Min
Max
Min
Max
Min
Max
Units
ns
3
TCLCL - 27 (3V)
TCLCL - 20 (5V)
7TCLCL - 70 (3V)
7TCLCL - 50 (5V)
TCLCL - 20
TWHQX
Data Hold After WR#
5
ns
142
10
ns
TQVWH
TQVWX
Data Valid to WR# High
125
5
ns
ns
Data Valid to WR# High to Low
Transition
RD# Low to Address Float
0
0
0
ns
TRLAZ
RD# to WR# High to ALE High
5
55
TCLCL - 25 (3V)
TCLCL - 15 (5V)
TCLCL + 25 (3V)
TCLCL + 15 (5V)
ns
TWHLH
10
40
ns
T14-8.0 1273
1. Calculated values are for x1 Mode only
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.
A: Address
Q: Output data
C: Clock
R: RD# signal
D: Input data
T: Time
H: Logic level HIGH
I: Instruction (program memory contents)
L: Logic level LOW or ALE
P: PSEN#
V: Valid
W: WR# signal
X: No longer a valid logic level
Z: High Impedance (Float)
For example:
AVLL = Time from Address Valid to ALE Low
LLPL = Time from ALE Low to PSEN# Low
T
T
©2007 Silicon Storage Technology, Inc.
S71273-03-000
1/07
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