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參數(shù)資料
| 型號： | ICL3238ECA-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 5DRVR/3RCVR RS232 3V 28-SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 5/3 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 帶卷 (TR) |
7
even during manual powerdown making it extremely useful
for RING INDICATOR monitoring. Standard receivers driving
powered down peripherals must be disabled to prevent
current flow through the peripheral’s protection diodes (see
functions, but the corresponding monitor receiver can be
dedicated to this task as shown in Figure 3.
Powerdown Functionality
This 3V RS-232 interface device requires a nominal supply
current of 0.3mA during normal operation (not in powerdown
mode). This is considerably less than the 5mA to 11mA
current required by 5V RS-232 devices. The already low
current requirement drops significantly when the device
enters powerdown mode. In powerdown, supply current
drops to 10nA, because the on-chip charge pump turns off
(V+ collapses to VCC, V- collapses to GND), and the
transmitter outputs three-state. This micro-power mode
makes this device ideal for battery powered and portable
applications.
Software Controlled (Manual) Powerdown
The ICL3238E allows the user to force the IC into the low
power, standby state, and utilizes a two pin approach where
the FORCEON and FORCEOFF inputs determine the IC’s
mode. For always enabled operation, FORCEON and
FORCEOFF are both strapped high. To switch between
active and powerdown modes, under logic or software
control, only the FORCEOFF input need be driven. The
FORCEON state isn’t critical, as FORCEOFF dominates
over FORCEON. Nevertheless, if strictly manual control over
powerdown is desired, the user must strap FORCEON high
to disable the enhanced automatic powerdown circuitry.
ICL3238E inverting (standard) receiver outputs also disable
when the device is in manual powerdown, thereby
eliminating the possible current path through a shutdown
Connecting FORCEOFF and FORCEON together disables
the enhanced automatic powerdown feature, enabling them
to function as a manual SHUTDOWN input (see Figure 4).
With any of the above control schemes, the time required to
exit powerdown, and resume transmission is only 25
s.
When using both manual and enhanced automatic
powerdown (FORCEON = 0), the ICL3238E won’t power up
from manual powerdown until both FORCEOFF and
FORCEON are driven high, or until a transition occurs on a
receiver or transmitter input. Figure 5 illustrates a circuit for
ensuring that the ICL3238E powers up as soon as
RXOUT
GND
≤ V
ROUT ≤ VCC
5k
RXIN
-25V
≤ VRIN ≤ +25V
GND
VCC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
VCC
POWERED
GND
SHDN = GND
VCC
Rx
Tx
VCC
CURRENT
VOUT = VCC
FLOW
RS-232 CHIP
DOWN
UART
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
ICL3238E
TRANSITION
RX
TX
R1OUTB
R1OUT
T1IN
FORCEOFF = GND
VCC
TO
R1IN
T1OUT
VOUT = HI-Z
POWERED
DETECTOR
DOWN
UART
WAKE-UP
LOGIC
FIGURE 4. CONNECTIONS FOR MANUAL POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
PWR
FORCEOFF
INVALID
CPU
I/O
FORCEON
ICL3238E
MGT
LOGIC
UART
ICL3238E
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