![](http://datasheet.mmic.net.cn/Maxim-Integrated-Products/MAX3109ETJ-_datasheet_98185/MAX3109ETJ-_9.png)
Dual Serial UART with 128-Word FIFOs
MAX3109
9
Maxim Integrated
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 1.71V to 3.6V, VL = 1.71V to 3.6V, VEXT = 1.71V to 3.6V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at
VCC = 2.8V, VL = 1.8V, VEXT = 2.5V, TA = +25NC.) (Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
UART INTERFACE
RTS_, TX_ OUTPUTS
Output Logic-Low Voltage
VOL
Sink current = 2mA
0.4
V
Output Logic-High Voltage
VOH
Source current = 2mA
0.7 x
VEXT
V
Input Leakage Current
IIL
Output is three-stated, VRTS = 0 to VEXT
-1
+1
F
A
Input Capacitance
CIN
High-Z mode
5
pF
CTS_, RX_ INPUTS
Input Logic-Low Voltage
VIL
0.3 x
VEXT
V
Input Logic-High Voltage
VIH
0.7 x
VEXT
V
Input Hysteresis
VHYST
50
mV
CTS_ Input Leakage Current
IIL
VCTS_ = 0 to VEXT
-1
+1
F
A
RX_ Pullup Current
IPU
VRX_ = 0V, VEXT = 3.6V
-7.5
-5.5
-3.5
F
A
Input Capacitance
CIN
5
pF
GPIO_ INPUTS/OUTPUTS
Output Logic-Low Voltage
VOL
Sink current = 20mA, push-pull or open-
drain output type, VEXT > 2.3V
0.45
V
Sink current = 20mA, push-pull or open-
drain output type, VEXT < 2.3V
0.55
Output Logic-High Voltage
VOH
Source current = 5mA, push-pull output
type
VEXT -
0.4
V
Input Logic-Low Voltage
VIL
GPIO_ is configured as an input
0.4
V
Input Logic-High Voltage
VIH
GPIO_ is configured as an input
2/3 x
VEXT
V
Pulldown Current
IPD
VGPIO_ = VEXT = 3.6V, GPIO_ is
configured as an input
3.5
5.5
7.5
F
A
XIN
Input Logic-Low Voltage
VIL
0.6
V
Input Logic-High Voltage
VIH
1.2
V
Input Capacitance
CXIN
16
pF
XOUT
Input Capacitance
CXOUT
16
pF