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MAX3320TEAP

P1-P3P4-P6P7-P9P10-P12
MAX3320A/B/L/T
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4µA AutoShutdown Plus and Power-On Reset
4 _______________________________________________________________________________________
-7.5
V
T_OUT-
V
T_OUT+
-2.5
-5.0
2.5
0
5.0
7.5
0 20001000 3000 4000 5000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3320 TOC01
LOAD CAPACITANCE (pF)
OUTPUT VOLTAGE (V)
ONE TRANSMITTER AT 250kbps
ONE TRANSMITTER AT 15.6kbps
LOAD = 3kΩ + C
L
0
2
8
6
4
10
12
0 20001000 3000 4000 5000
SLEW RATE
vs. LOAD CAPACITANCE
MAX3320 TOC02
LOAD CAPACITANCE (pF)
SLEW RATE (V/us)
ONE TRANSMITTER AT 250kbps
ONE TRANSMITTER AT 15.6kbps
LOAD = 3kΩ + C
L
NEGATIVE
SLEW
POSITIVE
SLEW
0
250kbps
120kbps
20kbps
10
5
30
20
25
15
40
35
45
0 20001000 3000 4000 5000
SUPPLY CURRENT
vs. LOAD CAPACITANCE WHEN
TRANSMITTING DATA
MAX3320 TOC03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
ONE TRANSMITTER AT
FULL DATA RATE INDICATED
ONE TRANSMITTER AT
1/16 DATA RATE INDICATED
TIMING CHARACTERISTICS
(V
CC
= 3V to 5.5V, C1–C4 = 0.1µF, C1–C4 = 0.1µF (for 3.3V ±10%), C1 = 0.047µF, C2–C4 = 0.33µF (tested at 5V ±10%),
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
kbps250
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching
Maximum Data Rate
ns100
|
t
PHL
- t
PLH
|
Transmitter Skew
0.3
µs
0.3
R_IN to R_OUT, C
L
= 150pFReceiver Propagation Delay
UNITSMIN TYP MAXCONDITIONSPARAMETER
t
PLH
t
PHL
ns200
|
t
PHL
- t
PLH
|
Receiver Skew
C
L
= 150pF to
1000pf
V/µs
6 30
V
CC
= 3.3V, R
L
= 3kΩ to 7kΩ,
measured from +3V to -3V or -3V to
+3V, T
A
= +25°C
Transition-Region Slew Rate
ms100 280V
CC
= reset threshold
RESET Active Timeout Period
µs40100mV overdrive from reset threshold
V
CC
to RESET Delay
C
L
= 150pF to
2500pf
4 30
__________________________________________Typical Operating Characteristics
(V
CC
= 3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ. Typical values are at T
A
= +25°C, unless
otherwise noted.)
MAX3320A/B/L/T
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4µA AutoShutdown Plus and Power-On Reset
_______________________________________________________________________________________ 5
______________________________________________________________Pin Description
300
0
10 100 1000
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
50
MAX3320toc05
RESET COMPARATOR OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (µs)
100
200
150
250
NOT IN
SHUTDOWN
MODE
SHUTDOWN MODE
C
BYPASS
= 0.1µF
0.960
0.970
1.010
1.000
0.990
0.980
1.030
1.020
1.040
-40 0-20 20 40 8060
NORMALIZED POWER-UP RESET
DELAY vs. TEMPERATURE
MAX3320 TOC06
TEMPERATURE (°C)
POWER-UP RESET DELAY
____________________________Typical Operating Characteristics (continued)
(V
CC
= 3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ. Typical values are at T
A
= +25°C, unless
otherwise noted.)
20 C1+ Positive terminal of voltage-doubler charge-pump capacitor
19 V
CC
+3V to +5.5V Supply Voltage
18 C1- Negative terminal of voltage-doubler charge-pump capacitor
NAME FUNCTION
1 V+ 5.5V generated by the charge pump
2 C2+ Positive terminal of inverting charge-pump capacitor
PIN
3 C2- Negative terminal of inverting charge-pump capacitor
4 V- -5.5V generated by the charge pump
10
RESET
RESET Output. RESET remains low while V
CC
is below the reset threshold, and for 280ms (max)
after V
CC
rises above the reset threshold.
9
INVALID
Output of the Valid Signal Detector. Asserts when no valid RS-232 levels are present on any of
the receiver inputs for 90µs.
7, 8 R_OUT TTL/CMOS Receiver Outputs (R1OUT and R2OUT)
5, 6 T_IN TTL/CMOS Transmitter Inputs (T1IN and T2IN)
17 GND Ground
15, 16 T_OUT RS-232 Transmitter Outputs (T2OUT and T1OUT)
13, 14 R_IN RS-232 Receiver Inputs (R2IN and R1IN)
12 FORCEON
Force-On Input. Drive FORCEON high to override AutoShutdown Plus, keeping transmitters on
(FORCEOFF must be high) (Table 1).
11
FORCEOFF
Force-Off Input. Drive FORCEOFF low to shut down transmitters and on-board power supply.
This overrides AutoShutdown Plus and FORCEON (Table 1).
MAX3320A/B/L/T
6 _______________________________________________________________________________________
______________ Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3320
’
s internal power supply consists of a reg-
ulated dual charge pump that provides output voltages
of +5.5V (doubling charge pump) and -5.5V (inverting
charge pump) while V
CC
remains in the 3V to 5.5V
range. The charge pumps operate in discontinuous
mode; they are enabled if the output voltages are less
than 5.5V, and disabled if output voltages exceed 5.5V.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5V EIA/TIA-232 levels. The
MAX3320 transmitters guarantee a 250kbps data rate
with worst-case loads of 3kΩ in parallel with 1000pF,
providing compatibility with PC-to-PC communication
software (such as LapLink™). Transmitters can be par-
alleled to drive multiple receivers. Figure 1 shows a
complete system connection.
When FORCEOFF is driven to ground, the transmitter
’
s
outputs become high impedance. When the
AutoShutdown Plus circuitry senses that all receiver
and transmitter inputs are inactive for more than 30sec,
the transmitters turn off and the outputs go into a high-
impedance state, but the receivers remain active.
When the power is off or the MAX3320 is shut down,
outputs may be driven up to ±12V.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or V
CC
.
Laplink is a trademark of Traveling Software.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic out-
put levels. All receivers have inverting outputs and are
active in shutdown FORCEOFF (Table 1).
AutoShutdown Plus Mode
Maxim’s AutoShutdown Plus feature, which operates
when FORCEOFF is high and FORCEON is low, achieves
a 4µA supply current. When the MAX3320 senses no
valid signal levels on all receiver and transmitter inputs for
30sec, the on-board power supply and drivers shut off,
Figure 1. Interface Under Control of PMU
Table 1. MAX3320 Output Control Truth Table
FORCEOFF
0 High-Z
T_OUT
Active
R_OUT
1 Active Active
Normal operation
(forced on)
X1
1 Active Active
Normal operation
(AutoShutdown Plus)
<30sec*0
1 High-Z Active
Shutdown
(AutoShutdown Plus)
>30sec*0
FORCEON
Shutdown
(forced off)
XX
OPERATION
STATUS
AUTOSHUTDOWN
PLUS*
X = Don’t Care
*
Time since last receiver or transmitter input activity
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4µA AutoShutdown Plus and Power-On Reset
P1-P3P4-P6P7-P9P10-P12

MAX3320TEAP

Mfr. #:
Buy MAX3320TEAP
Manufacturer:
Maxim Integrated
Description:
RS-232 Interface IC 3V to 5.5V, Up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power On Reset
Lifecycle:
New from this manufacturer.
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