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參數(shù)資料
| 型號： | ICL3244ECA |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | PLASTIC, MO-150AH, SSOP-28 |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 458K |
| 代理商： | ICL3244ECA |
7
Detailed Description
These ICL32XXE 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 ICL32XXE 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
All the ICL32XXE devices contain standard inverting
receivers, but only the ICL3244E receivers can three-state,
via the FORCEOFF control line. Additionally, the ICL3244E
includes a 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.
Receiver Skew
t
PHL
- t
PLH
25
-
50
-
ns
Transition Region Slew Rate
V
CC
= 3.3V,
R
L
= 3k
to 7k
,
Measured From 3V to -3V or -3V
to 3V
C
L
= 150pF to 1000pF
25
6
-
30
V/
μ
s
C
L
= 150pF to 2500pF
25
4
8
30
V/
μ
s
ESD PERFORMANCE
RS-232 Pins (T
OUT
, R
IN
)
Human Body Model
25
-
±
15
-
kV
IEC61000-4-2 Contact Discharge
25
-
±
8
-
kV
IEC61000-4-2 Air Gap Discharge
25
-
±
15
-
kV
All Other Pins
Human Body Model
25
-
±
3
-
kV
NOTE:
2. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
Electrical Specifications
Test Conditions: V
CC
= 3V to 5.5V, C
1
- C
4
= 0.1
μ
F; Unless Otherwise Specified.
Typicals are at T
A
= 25°C
(Continued)
PARAMETER
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
MAX
UNITS
R
XOUT
GND
≤
V
ROUT
≤
V
CC
5k
R
XIN
-25V
≤
V
RIN
≤
+25V
GND
V
CC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
ICL3224E, ICL3226E, ICL3244E
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