MAX3238E Datasheet, PDF (4/14 Pages) Maxim Integrated Products – +3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins

+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
ELECTRICAL CHARACTERISTICS (continued)
(V_CC = +3.0V to +5.5V, C1–C4 = 0.1µF (tested at 3.3V ±5%), C1–C4 = 0.22µF (tested at 3.3V ±10%), C1 = 0.047µF, and
C2–C4 = 0.33µF (tested at 5.0V ±10%), T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at T_A = +25°C.)
PARAMETER
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
Transition-Region Slew Rate
CONDITIONS
R_L = 3kΩ, C_L = 1000pF, one transmitter switching
R_IN to R_OUT,
t_PHL
C_L = 150pF
t_PLH
Normal operation
Normal operation
| t_PHL - t_PLH |
| t_PHL - t_PLH |
V_CC = 3.3V,
T_A = +25°C,
R_L = 3kΩ to 7kΩ,
measured from +3V to
-3V or -3V to +3V
C_L = 150pF to 1000pF
C_L = 150pF to 2500pF
MIN TYP MAX UNITS
250
0.15
0.15
2.6
2.4
50
50
6
4
kbps
µs
µs
µs
ns
ns
30
V/µs
30
Note 2: The transmitter inputs have an active positive feedback resistor. The input current goes to zero when the inputs are at the
supply rails.
Note 3: During AutoShutdown only, a transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic
wake-up thresholds.
__________________________________________Typical Operating Characteristics
(V_CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, T_A = +25°C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
6
5
4
V_OUT+
3
2
FOR DATA RATES UP TO 250kbps
1
1 TRANSMITTER 250kbps
0
4 TRANSMITTERS 15.6kbps
-1
ALL TRANSMITTERS LOADED
-2
WITH 3kΩ + C_L
-3
-4
-5
V_OUT-
-6
0 500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
SLEW RATE vs. LOAD CAPACITANCE
12
10
SR-
8
SR+
6
4
1 TRANSMITTER 250kbps
2
4 TRANSMITTERS 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ + C_L
0
0 500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA
50
250kbps
40
120kbps
30
20kbps
20
1 TRANSMITTER 20kbps, 120 kbps, 250kbps
4 TRANSMITTERS 15.6kbps
10 ^{ALL TRANSMITTERS LOADED}
WITH 3kΩ + C_L
0
0 500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
4 _______________________________________________________________________________________