參數(shù)資料
型號(hào)： ICL3244CB
廠商： INTERSIL CORP
元件分類： 通用總線功能
英文描述： 1Microamp, +3V to +5.5V, 250kbps, RS-232 Transceiver with Enhanced Automatic Powerdown
中文描述： TRIPLE LINE TRANSCEIVER, PDSO28
封裝： PLASTIC, EXPOSED PAD, SOIC-28
文件頁(yè)數(shù)： 5/13頁(yè)
文件大?。?/td> 141K
代理商： ICL3244CB
4-5
Detailed Description
ICL32XX interface ICs operate from a single +3V to +5.5V
supply, guarantee a 250kbps minimum data rate, require
only four small external 0.1
μ
F capacitors, feature low power
consumption, and meet all ElA RS-232C and V.28
specifications. The circuit is divided into three sections: The
charge pump, the transmitters, and the receivers.
Charge-Pump
Intersil’s new ICL32XX family utilizes regulated on-chip dual
charge pumps as voltage doublers, and voltage inverters to
generate
±
5.5V transmitter supplies from a V
CC
supply as
low as 3.0V. This allows these devices to maintain RS-232
compliant output levels over the
±
10% tolerance range of
3.3V powered systems. The efficient on-chip power supplies
require only four small, external 0.1
μ
F capacitors for the
voltage doubler and inverter functions at V
CC
= 3.3V. See
the “Capacitor Selection” section, and Table 3 for capacitor
recommendations for other operating conditions. The charge
pumps operate discontinuously (i.e., they turn off as soon as
the V+ and V- supplies are pumped up to the nominal
values), resulting in significant power savings.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. Coupled with the on-chip
±
5.5V supplies,
these transmitters deliver true RS-232 levels over a wide
range of single supply system voltages.
Transmitter outputs disable and assume a high impedance
state when the device enters the powerdown mode (see
Table 2). These outputs may be driven to
±
12V when
disabled.
All devices guarantee a 250kbps data rate for full load
conditions (3k
and 1000pF), V
CC
≥
3.0V, with one
transmitter operating at full speed. Under more typical
conditions of V
CC
≥
3.3V, R
L
= 3k
, and C
L
= 250pF, one
transmitter easily operates at 1Mbps.
Transmitter inputs float if left unconnected, and may cause
I
CC
increases. Connect unused inputs to GND for the best
performance.
Receivers
The ICL3244 contains both standard inverting, tri-stable
receivers, and a single noninverting (monitor) receiver
(denoted by the R
OUTB
label) that is always active,
regardless of the state of any control lines. Both receiver
types convert RS-232 signals to CMOS output levels and
accept inputs up to
±
25V while presenting the required 3k
to 7k
input impedance (see Figure 1) even if the power is
off (V
CC
= 0V). The receivers’ Schmitt trigger input stage
uses hysteresis to increase noise immunity and decrease
errors due to slow input signal transitions.
The inverting receivers disable during forced (manual)
powerdown, but not during automatic powerdown (see Table
2). Conversely, the monitor receiver remains active even
TABLE 2. POWERDOWN LOGIC TRUTH TABLE
RCVR OR
XMTR
EDGE
WITHIN 30
SEC
FORCEOFF
INPUT
FORCEON
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
R
OUTB
OUTPUTS
RS-232
LEVEL
PRESENT
AT
RECEIVER
INPUT
INVALID
OUTPUT
MODE OF OPERATION
ICL3244
NO
H
H
Active
Active
Active
No
L
Normal Operation (Enhanced
Auto Powerdown Disabled)
NO
H
H
Active
Active
Active
Yes
H
YES
H
L
Active
Active
Active
No
L
Normal Operation (Enhanced
Auto Powerdown Enabled)
YES
H
L
Active
Active
Active
Yes
H
NO
H
L
High-Z
Active
Active
No
L
Powerdown Due to Enhanced
Auto Powerdown Logic
NO
H
L
High-Z
Active
Active
Yes
H
X
L
X
High-Z
High-Z
Active
No
L
Manual Powerdown
X
L
X
High-Z
High-Z
Active
Yes
H
ICL3244 - INVALID DRIVING FORCEON AND FORCEOFF
(EMULATES AUTOMATIC POWERDOWN)
X
Note 3
Note 3
Active
Active
Active
Yes
H
Normal Operation
X
Note 3
Note 3
High-Z
High-Z
Active
No
L
Forced Auto Powerdown
NOTE:
3. Input is connected to INVALID Output.
ICL3244
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