MAX3316CAE-T Maxim Integrated, MAX3316CAE-T Datasheet - Page 8

• Manufacturer Part Number: MAX3316CAE-T
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3316, MAX3317, MAX3318, MAX3319r

Specifications of MAX3316CAE-T

• Data Rate: 460 Kbps
• Operating Supply Voltage: 2.5 V
• Supply Current: 1 mA
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: SMD/SMT
• Function: Transceiver
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Number Of Drivers: 2
• Number Of I/os: 8
• Number Of Receivers: 2
• Propagation Delay Time Ns: 0.175 us
• Shutdown: No

Supply current falls to less than 1µA in shutdown mode
(SHDN = low). When shut down, the device’s charge
pumps are turned off, V+ is pulled down to V
pulled to ground, and the transmitter outputs are disabled
(high impedance). The time required to exit shutdown is
typically 30µs, as shown in Figure 2. Connect SHDN to
V
effect on R_OUT.
2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers
Table 1. Output Control Truth Table (MAX3318/MAX3319)
X = Don’t care
* INVALID connected to FORCEON
** INVALID connected to FORCEON and FORCEOFF
Table 2. Shutdown and Enable Control
Truth Table (MAX3317)
8
Shutdown (Forced
Off)
Normal Operation
(Forced On)
Normal Operation
(AutoShutdown Plus)
Shutdown
(AutoShutdown Plus)
Normal Operation
Normal Operation
Shutdown
Normal Operation
(AutoShutdown)
Shutdown
(AutoShutdown)
CC
_______________________________________________________________________________________
OPERATION
SHDN
if the shutdown mode is not used; SHDN has no
STATUS
0
0
1
1
EN
0
1
0
1
MAX3317 Shutdown Mode
FORCEON
INVALID**
INVALID**
INVALID*
INVALID*
INVALID*
X
1
0
0
T_OUT
High-Z
High-Z
Active
Active
FORCEOFF
INVALID**
INVALID**
0
1
1
1
1
1
1
R_OUT
High-Z
High-Z
Active
Active
CC
, V- is
VALID RECEIVER
LEVEL
Yes
Yes
No
No
Maxim’s AutoShutdown Plus feature on the MAX3318/
MAX3319 allows the supply current to fall to 1µA. These
devices will enter the AutoShutdown Plus mode if
FORCEOFF is high, FORCEON is low, and they do not
sense a valid signal transition on any receiver or trans-
mitter input for 30 seconds. This may occur if the RS-232
cable is disconnected or if the peripheral transmitters
are turned off, and the UART driving the transmitter
inputs is inactive. The system turns on again when a
valid transition is applied to any RS-232 receiver or
transmitter input. As a result, the system saves power
without changes to the existing BIOS or operating system.
Figure 4a depicts valid and invalid RS-232 receiver volt-
age levels. INVALID indicates the receiver input’s condi-
tion and is independent of FORCEON and FORCEOFF
states. Figure 3 and Table 1 summarize the operating
modes of the MAX3318/MAX3319. FORCEON and
FORCEOFF override AutoShutdown Plus circuitry. When
neither control is asserted, the IC selects between these
states automatically, based on the last receiver or trans-
mitter edge received.
X
X
X
X
X
TRANSMITTER
RECEIVER OR
EDGE WITHIN
30s
Yes
Yes
No
No
X
X
X
X
X
AutoShutdown Plus Mode
T_OUT
High-Z
High-Z
High-Z
High-Z
Active
Active
Active
Active
Active
MAX3318/MAX3319
R_OUT
Active
Active
Active
Active
Active
Active
Active
Active
Active