Datasheet

Dual Serial UART with 128-Word FIFOs
MAX3109
9Maxim Integrated
DC ELECTRICAL CHARACTERISTICS (continued)
(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
UART INTERFACE
RTS_, TX_ OUTPUTS
Output Logic-Low Voltage V
OL
Sink current = 2mA 0.4 V
Output Logic-High Voltage V
OH
Source current = 2mA
0.7 x
V
EXT
V
Input Leakage Current I
IL
Output is three-stated, V
RTS
= 0 to V
EXT
-1 +1
FA
Input Capacitance C
IN
High-Z mode 5 pF
CTS_, RX_ INPUTS
Input Logic-Low Voltage V
IL
0.3 x
V
EXT
V
Input Logic-High Voltage V
IH
0.7 x
V
EXT
V
Input Hysteresis V
HYST
50 mV
CTS_ Input Leakage Current
I
IL
V
CTS_
= 0 to V
EXT
-1 +1
FA
RX_ Pullup Current I
PU
V
RX_
= 0V, V
EXT
= 3.6V -7.5 -5.5 -3.5
FA
Input Capacitance C
IN
5 pF
GPIO_ INPUTS/OUTPUTS
Output Logic-Low Voltage V
OL
Sink current = 20mA, push-pull or open-
drain output type, V
EXT
> 2.3V
0.45
V
Sink current = 20mA, push-pull or open-
drain output type, V
EXT
< 2.3V
0.55
Output Logic-High Voltage V
OH
Source current = 5mA, push-pull output
type
V
EXT
-
0.4
V
Input Logic-Low Voltage V
IL
GPIO_ is configured as an input 0.4 V
Input Logic-High Voltage V
IH
GPIO_ is configured as an input
2/3 x
V
EXT
V
Pulldown Current I
PD
V
GPIO_
= V
EXT
= 3.6V, GPIO_ is
configured as an input
3.5 5.5 7.5
FA
XIN
Input Logic-Low Voltage V
IL
0.6 V
Input Logic-High Voltage V
IH
1.2 V
Input Capacitance C
XIN
16 pF
XOUT
Input Capacitance C
XOUT
16 pF