MAX3241E MAXIM [Maxim Integrated Products], MAX3241E Datasheet - Page 8

• Manufacturer Part Number: MAX3241E
• Manufacturer: MAXIM [Maxim Integrated Products]

The complementary outputs on the MAX3237E/MAX3241E
(R_OUTB) are always active, regardless of the state of EN
or SHDN. This allows the device to be used for ring indica-
tor applications without forward biasing other devices con-
nected to the receiver outputs. This is ideal for systems
where V
peripherals such as UARTs (Figure 2).
Supply current falls to less than 1µA in shutdown mode
(SHDN = low). The MAX3237E’s supply current falls to
10nA (typ) when all receiver inputs are in the invalid
range (-0.3V < R_IN < +0.3). When shut down, the
device’s charge pumps are shut off, V+ is pulled down
to V
outputs are disabled (high impedance). The time
required to recover from shutdown is typically 100µs,
as shown in Figure 3. Connect SHDN to V
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
Figure 1. Slew-Rate Test Circuits
8
C1
C2
V
CC
CC
______________________________________________________________________________________
MINIMUM SLEW-RATE TEST CIRCUIT
, V- is pulled to ground, and the transmitter
CC
0.1µF
C1+
C1-
C2+
C2-
T_ IN
R_ OUT
drops to 0 in shutdown to accommodate
MAX3222E/MAX3237E/MAX3241E
MAX3222E
MAX3232E
MAX3237E
MAX3241E
GND
V
CC
5k
T_ OUT
R_ IN
V+
V-
Shutdown Mode
3k
CC
if the shut-
C3
C4
2500pF
down mode is not used. SHDN has no effect on R_OUT
or R_OUTB (MAX3237E/MAX3241E).
As with all Maxim devices, ESD-protection structures
are incorporated to protect against electrostatic
discharges encountered during handling and assem-
bly. The driver outputs and receiver inputs of the
Table 1. MAX3222E/MAX3237E/MAX3241E
Shutdown and Enable Control Truth Table
SHDN
C1
C2
V
0
0
1
1
CC
MAXIMUM SLEW-RATE TEST CIRCUIT
0.1µF
T_ IN
R_ OUT
C1+
C1-
C2+
C2-
EN
0
1
0
1
MAX3222E
MAX3232E
MAX3237E
MAX3241E
T_OUT
High-Z
High-Z
Active
Active
GND
V
CC
±15kV ESD Protection
5k
T_ OUT
R_OUT
High-Z
High-Z
Active
Active
R_ IN
V+
V-
7k
(MAX3237E/
MAX3241E)
R_OUTB
Active
Active
Active
Active
C3
C4
150pF