Datasheet

Dual Serial UART with 128-Word FIFOs
MAX3109
10 Maxim Integrated
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 1.71V to 3.6V, V
L
= 1.71V to 3.6V, V
EXT
= 1.71V to 3.6V T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at
V
CC
= 2.8V, V
L
= 1.8V, V
EXT
= 2.5V, T
A
= +25NC.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
External Cystal Frequency f
XOSC
1 4 MHz
External Clock Frequency f
CLK
0.5 35 MHz
External Clock Duty Cycle (Note 5) 45 55 %
Baud-Rate Generator Clock
Input Frequency
f
REF
(Note 5) 96 MHz
I
2
C BUS: TIMING CHARACTERISTICS (Figure 1)
SCL Clock Frequency f
SCL
Standard mode 100
kHzFast mode 400
Fast mode plus 1000
Bus Free Time Between a STOP
and START Condition
t
BUF
Standard mode 4.7
Fs
Fast mode 1.3
Fast mode plus 0.5
Hold Time for START Condition
and Repeated START Condition
t
HD:STA
Standard mode 4.0
Fs
Fast mode 0.6
Fast mode plus 0.26
Low Period of the SCL Clock t
LOW
Standard mode 4.7
Fs
Fast mode 1.3
Fast mode plus 0.5
High Period of the SCL Clock t
HIGH
Standard mode 4.0
Fs
Fast mode 0.6
Fast mode plus 0.26
Data Hold Time t
HD:DAT
Standard mode 0 0.9
Fs
Fast mode 0 0.9
Fast mode plus 0
Data Setup Time t
SU:DAT
Standard mode 250
nsFast mode 100
Fast mode plus 50
Setup Time for Repeated START
Condition
t
SU:STA
Standard mode 4.7
Fs
Fast mode 0.2
Fast mode plus 0.26
Rise Time of Incoming SDA and
SCL Signals
t
R
Standard mode (0.3 x V
L
to 0.7 x V
L
)
(Note 6)
20 +
0.1C
B
1000
ns
Fast mode (0.3 x V
L
to 0.7 x V
L
) (Note 6)
20 +
0.1C
B
300
Fast mode plus 120
Fall Time of SDA and SCL
Signals
t
F
Standard mode (0.3 x V
L
to 0.7 x V
L
)
(Note 6)
20 +
0.1C
B
1000
ns
Fast mode (0.3 x V
L
to 0.7 x V
L
) (Note 6)
20 +
0.1C
B
300
Fast mode plus 120