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SP385ACTのメーカーはSipexです、この部品の機能は「+3V to +5V RS-232 Line Driver/Receiver」です。 |
部品番号 | SP385ACT |
| |
部品説明 | +3V to +5V RS-232 Line Driver/Receiver | ||
メーカ | Sipex | ||
ロゴ | |||
このページの下部にプレビューとSP385ACTダウンロード(pdfファイル)リンクがあります。 Total 9 pages
® SP385A
+3V to +5V RS-232 Line Driver/Receiver
s Operates from 3.3V or 5V Power Supply
s Meets All EIA-232D and V.28 Specifica-
tions at 5V
s Meets EIA-562 Specifications at 3.3V
s Two Drivers and Receivers
s Operates with 0.1µF to 10µF Capacitors
s High Data Rate — 120kbps Under Load
s Low Power Shutdown ≤1µA
s 3-State TTL/CMOS Receiver Outputs
s Low Power CMOS — 5mA Operation
DESCRIPTION…
The Sipex SP385A is an enhanced version of the Sipex SP200 family of RS232 line drivers/
receivers. The SP385A offers +3.3V operation for EIA-562 and EIA-232 applications. The
SP385A maintains the same performance features offered in its predecessors. The SP385A is
available in plastic SOIC or SSOP packages operating over the commercial and industrial
temperature ranges. The SP385A is pin compatible to the LTC1385 EIA-562 transceiver, except
the drivers in the SP385A can only be disabled with the ON/OFF pin.
RS232 OUTPUTS RS232 INPUTS
CHARGE
PUMP
T1 T2
R1 R2
SP385ADS/05
TTL/CMOS INPUTS TTL/CMOS OUTPUTS
SP385A Line Driver/Receiver
1
© Copyright 2000 Sipex Corporation
1 Page SPECIFICATIONS
VCC=+5V±10%;
0.1µF
charge
pump
capacitors;
T
MIN
to
T
MAX
unless otherwise noted.
PARAMETERS
TTL INPUT
Logic Threshold
Low
High
Logic Pullup Current
Maximum Data Rate
TTL OUTPUT
TTL/CMOS Output
Voltage, Low
Voltage, High
Leakage Current; TA = +25°C
EIA-232 OUTPUT
Output Voltage Swing
MIN.
2.0
120
3.5
±5
TYP.
15
0.05
±9
MAX.
0.8
200
0.4
±10
Power-Off Output Resistance 300
Output Short Circuit Current
±18
EIA-232 INPUT
Voltage Range
Voltage Threshold
Low
High
Hysteresis
Resistance
-15 +15
0.8 1.2
1.7 2.4
0.2 0.5 1.0
357
DYNAMIC CHARACTERISTICS
Driver Propagation Delay
Receiver Propagation Delay
4.0
1.5
Instantaneous Slew Rate
30
Transition Region Slew Rate
10
Output Enable Time
Output Disable Time
POWER REQUIREMENTS
VCC Power Supply Current
Shutdown Supply Current
400
250
10 15
25
1 10
UNITS
CONDITIONS
Volts
Volts
µA
kbps
TIN ; ON/OFF
TIN ; ON/OFF
TIN = 0V
CL = 2500pF, RL= 3kΩ
Volts
Volts
µA
Volts
Ω
mA
Volts
Volts
Volts
Volts
kΩ
µs
µs
V/µs
V/µs
ns
ns
mA
mA
µA
IOUT = 3.2mA; Vcc = +5V
IOUT = -1.0mA
ON/OFF = O, 0V ≤ VOUT ≤ VCC
All transmitter outputs loaded
with 3kΩ to ground
VCC = 0V; VOUT = ±2V
Infinite duration
VCC = 5V, TA = +25°C
VCC = 5V, TA = +25°C
VCC = 5V, TA = +25°C
VIN = 15V to –15V
TTL to RS-232
RS-232 to TTL
CL = 10pF, RL= 3kΩ - 7kΩ;
TA =+25°C
CL = 2500pF, RL= 3kΩ;
measured from +3V to -3V
or -3V to +3V
No load, TA= +25°C; VCC = 5V
All transmitters RL = 3kΩ;
TA = +25°C
VCC = 5V, TA = +25°C
PERFORMANCE CURVES
-11
-10
-9
-8
-7
-6
-5
-4
-3
0
VCC = 6V
VCC = 5V
VCC = 4V
2 4 6 8 10 12 14
Load Current (mA)
12
10
VCC = 6V
8 VCC = 5V
VCC = 4V
6
4
2
0
0 5 10 15 20 25 30 35 40
Load Current (mA)
30
25
VCC = 6V
20
15
10
5
0
-55
VCC = 5V
VCC = 4V
VCC = 3V
-40 0 25 70 85
Temperature (°C)
125
8.4
8.2
8.0
7.8
7.6
7.4
7.2
7.0
6.8
4.5
Load current = 0mA
TA = 25°C
4.75 5.0 5.25
VCC (Volts)
5.5
SP385ADS/05
SP385A Line Driver/Receiver
3
© Copyright 2000 Sipex Corporation
3Pages VCC
GND
S1
S2
INTERNAL
OSCILLATOR
S3
+
C1
S4
+
C3
V+ = 2VCC
VCC
V+
FROM
VOLTAGE DOUBLER
GND
S1
S2
INTERNAL
OSCILLATOR
S3
+
C2
S4
+
C4
GND
V- = -(V+)
Figure 1. Charge Pump Voltage Doubler
Charge Pump
The charge pump section of the these devices
allows the circuit to operate from a single +5V
±10% power supply by generating the required
operating voltages internal to the devices. The
charge pump consists of two sections — 1) a
voltage doubler and 2) a voltage inverter.
As shown in Figure 1, an internal oscillator trig-
gers the charge accumulation and voltage inver-
sion. The voltage doubler momentarily stores a
charge on capacitor C1 equal to Vcc, referenced to
ground. During the next transition of the oscillator
this charge is boot-strapped to transfer charge to
VcacpcatcoitVor+.C3. The voltage across C3 is now from
In the inverter section (Figure 2), the voltage
ttaorcarnVoss+fseaCrcc3rhoisastrsrgaCen2ts.ofeBCror4eodtto-tsogtreCanp2rpfaotienrcgVino-g.f
a range of 0V
C2 will then
One of the significant enhancements over previ-
ous products of this type is that the values of the
capacitors are no longer critical and have been
decreased in size considerably to 0.1µF. Because
the charge pump runs at a higher frequency, the
0.1µF capacitors are sufficient to transfer and
sustain charges to the two transmitters.
APPLICATION HINTS
Protection From Shorts to ±15V
The driver outputs are protected against shorts
to ground, other driver outputs, and V+ or V-. If
the possibility exists that the outputs could be
inadvertently connected to voltages higher than
±15V, then it is recommended that external
protection be provided. For protection against
Figure 2. Charge Pump Voltage Inverter
voltages exceeding ±15V, two back-to-back zener
diodes connected from each output to ground will
clamp the outputs to an acceptable voltage level.
Shutdown (ON/OFF)
The SP385A has a shut-down/standby mode to
conserve power in battery-powered systems. To
activate the shutdown mode, which stops the op-
eration of the charge pump, a logic “0” is applied
to the appropriate control line. The shutdown
mode is controlled on the SP385A by a logic “0”
on the ON/OFF control line (pin 18 for the SOIC
and pin 20 for the SSOP packages); this puts the
transmitter outputs in a tri–state mode.
SP385ADS/05
SP385A Line Driver/Receiver
6
© Copyright 2000 Sipex Corporation
6 Page | |||
ページ | 合計 : 9 ページ | ||
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