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MAX3316ECAE View Datasheet(PDF) - Maxim Integrated

Part NameDescriptionManufacturer
MAX3316ECAE ±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers MaximIC
Maxim Integrated MaximIC
MAX3316ECAE Datasheet PDF : 17 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
Table 1. Output Control Truth Table (MAX3318E/MAX3319E)
OPERATION
STATUS
Shutdown (Forced
Off)
FORCEON
X
FORCEOFF
VALID RECEIVER
LEVEL
RECEIVER OR
TRANSMITTER
EDGE WITHIN
30s
0
X
X
Normal Operation
(Forced On)
1
1
X
X
Normal Operation
(AutoShutdown Plus)
0
1
X
Yes
Shutdown
(AutoShutdown Plus)
0
1
X
No
Normal Operation
INVALID*
1
Yes
X
T_OUT
High-Z
Active
Active
High-Z
Active
R_OUT
Active
Active
Active
Active
Active
Normal Operation
INVALID*
1
X
Yes
Active
Active
Shutdown
INVALID*
1
Normal Operation
(AutoShutdown)
INVALID**
INVALID**
Shutdown
(AutoShutdown)
INVALID**
INVALID**
X = Don’t care
*INVALID connected to FORCEON
**INVALID connected to FORCEON and FORCEOFF
Table 2. Shutdown and Enable Control
Truth Table (MAX3317E)
SHDN
0
0
1
1
EN
T_OUT
R_OUT
0
High-Z
Active
1
High-Z
High-Z
0
Active
Active
1
Active
High-Z
down is typically 30µs, as shown in Figure 2. Connect
SHDN to VCC if the shutdown mode is not used; SHDN
has no effect on R_OUT.
MAX3318E/MAX3319E
AutoShutdown Plus Mode
Maxim’s AutoShutdown Plus feature on the MAX3318E/
MAX3319E 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
No
No
High-Z
Active
Yes
X
Active
Active
No
X
High-Z
Active
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 MAX3318E/MAX3319E. 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.
When shut down, the device’s charge pumps turn off,
V+ is pulled to VCC, V- is pulled to ground, the transmitter
outputs are high impedance, and READY is driven low.
The time required to exit shutdown is typically 30µs
(Figure 2).
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