ST3222B
ST3222C
3 to 3.6 V, low power, up to 400 kbps
RS-232 drivers and receivers
Features
■
300 µA supply current
■
250 kbps minimum guarantee data rate
■
6 V/µs minimum guarantee slew rate
■
Meet EIA/TIA-232 specification down to 3 V
TSSOP20
Description
The ST3222 is a 3 V powered EIA/TIA-232 and
V.28/V.24 communications interface with low
power requirements and high data-rate
capabilities. ST3222 has a proprietary low
dropout transmitter output stage providing true
RS-232 performance from 3 to 3.6 V power
supplies. The device requires only four small 0.1
mF standard external capacitors for operating
from 3 V supply. The ST3222 has two receivers
and two drivers. The ST3222 features a 1 mA
shutdown mode that reduces power consumption
and extends battery life in portable systems. Its
receivers can remain active in shutdown mode,
allowing external devices such as modems to be
monitored using only 1 mA supply current. The
device is guaranteed to run at data rates of
250 Kbps while maintaining RS-232 output levels.
Typical applications are notebooks, subnotebooks and palmtop computers, battery
powered equipment, hand-held equipment,
peripherals and printers.
Table 1.
Device summary
Order codes
Temperature
range
Package
Packaging
ST3222CTR
0 to 70 °C
TSSOP20 (tape and reel)
2500 parts per reel
ST3222BTR
-40 to 85 °C
TSSOP20 (tape and reel)
2500 parts per reel
August 2010
Doc ID 7512 Rev 7
1/13
www.st.com
1
Contents
ST3222B - ST3222C
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1
4
Receiver electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13
Doc ID 7512 Rev 7
ST3222B - ST3222C
Pin configuration
1
Pin configuration
Figure 1.
Pin connections
CS02220
Table 2.
Pin descriptions
Pin n°
Symbol
Name and function
1
EN
Receiver enable control. Drive low for normal operation. Drive high to force the receivers
outputs (R_OUT) into a high-impedance state.
2
C1+
Positive terminal for the first charge pump capacitor
3
V+
5.5 V Generated by the charge pump.
4
C1-
Negative terminal for the first charge pump capacitor
5
C2+
Positive terminal for the second charge pump capacitor
6
C2-
Negative terminal for the second charge pump capacitor
7
V-
-5.5 V Generated by the charge pump.
8
T2OUT
9
R2IN
Second receiver Input voltage
10
R2OUT
Second receiver output voltage
11
NC
Not connected
12
T2IN
Second transmitter input voltage
13
T1IN
First transmitter Input voltage
14
NC
Not connected
15
R1OUT
16
R1IN
17
T1OUT
18
GND
Ground
19
VCC
Supply voltage
20
SHDN
Second transmitter output voltage
First receiver output voltage
First receiver input voltage
First transmitter output voltage
Active low shutdown control input. Drive low to shutdown transmitter and charge pump
Doc ID 7512 Rev 7
3/13
Maximum ratings
ST3222B - ST3222C
2
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
-0.3 to 6
V
VCC
Supply voltage
V+
Doubled voltage terminal
(VCC - 0.3) to 7
V
V-
Inverted voltage terminal
0.3 to -7
V
13
V
-0.3 to 6
V
± 25
V
± 13.2
V
-0.3 to (VCC + 0.3)
V
V+ +|V-|
TIN
Transmitter input voltage range
RIN
Receiver input voltage range
TOUT
Transmitter output voltage range
ROUT
Receiver output voltage range
tSHORT
Note:
Transmitter output short to gnd time
Continuous
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Externally applied V+ and V- can have a maximum magnitude of +7 V, but their absolute
addition can not exceed 13 V.
Running on internal charge pump, intrinsic self limitation allows exceeding those values
without any damage.
Startup voltage sequence (VCC, then V+, then V-) is critical, therefore it is not recommended
to use this device using externally applied voltage to V+ and V-.
4/13
Doc ID 7512 Rev 7
ST3222B - ST3222C
Electrical characteristics
3
Electrical characteristics
Table 4.
Electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless
otherwise specified. Typical values are referred to TA = 25 °C)
Symbol
Parameter
ISUPPLY
VCC power supply
current
No load VCC = 3.3 V
SHDN = VCC
SHUTDOWN supply
current
No load VCC = 3.3V
SHDN = GND
ISHDN
Table 5.
Symbol
Test conditions
Parameter
Max.
Unit
TA = 25 °C
0.3
1
mA
TA = 25 °C
1
10
µA
Test conditions
Input logic threshold low T-IN, EN, SHDN (Note:)
VIH
Input logic threshold
high
IIL
Typ.
Logic input electrical characteristics (C1 - C4 = 0.1 µF, VC = 3 V to 3.6 V,
TA = - 40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C)
VIL
VHYS
Min.
VCC = 3.3 V
Min.
Max.
Unit
0.8
V
2
Transmitter input
hysteresis
Input leakage current
Typ.
V
0.5
± 0.01
T-IN, EN, SHDN
V
±1
µA
Note:
Transmitter input hysteresis is typically 250 mV
Table 6.
Transmitter electrical characteristics (C1 - C4 = 0.1 µA VCC = 3 V to 3.6 V,
TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VTOUT
Output voltage swing
All transmitter outputs are loaded with
3 kΩ to GND
±5
± 5.4
V
RTOUT
Transmitter output
resistance
VCC = V+ = V- = 0 V, VOUT = ± 2 V
300
10M
Ω
ITSC
Output short circuit
current
ITOL
Output leakage current
VCC = 0V or 3 V to 3.6 V, VOUT = ± 12 V
Transmitters disable
Doc ID 7512 Rev 7
± 60
mA
± 25
µA
5/13
Electrical characteristics
ST3222B - ST3222C
3.1
Receiver electrical characteristics
Table 7.
Receiver electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C,
unless otherwise specified. Typical values are referred to TA = 25 °C)
Symbol
Parameter
Test conditions
IOL
Output leakage current
VRIN
Receiver Input voltage
operating range
VRIL
Input threshold low
TA = 25 °C, VCC = 3.3 V
VRIH
Input threshold high
TA = 25 °C, VCC = 3.3 V
R-OUT, EN = VCC, receiver disabled
Input hysteresis
RRIN
Input resistance
VROL
TTL/CMOS output voltage
IOUT = 1.6 mA
low
VROH
TTL/CMOS output voltage
IOUT = -1 mA
high
Symbol
Typ.
Max.
Unit
± 0.05
± 10
µA
25
V
-25
VRIHYS
Table 8.
Min.
0.6
1.2
1.5
V
2.4
V
0.5
TA = 25 °C
3
5
V
7
kΩ
0.4
V
VCC-0.6 VCC-0.1
V
Timing characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless
otherwise specified. Typical values are referred to TA = 25 °C)
Parameter
Test conditions
DR
Data transfer rate
RL = 3 kΩ CL2= 1000 pF
one transmitter switching
tPHLR
tPLHR
Propagation delay
input to output
RXIN to RXOUT, CL = 150 pF
|tPHLT
- tTHL|
Transmitter
propagation delay
difference (1)
Min.
Typ.
Max.
Unit
240
400
Kbps
0.2
µs
100
ns
tOER
Receiver output
enable time
Normal operation
200
ns
tODR
Receiver output
disable time
Normal operation
200
ns
50
ns
|tPHLR
- tTHR|
SRT
Receiver propagation
delay difference
Transition slew rate
TA = 25 °C, RL = 3 kΩ to 7 kΩ, VCC = 3.3 V
measured from +3 V to -3 V or -3 V to +3 V
CL = 150 pF to 1000 pF
CL = 150pF to 2500pF
1. Transmitter skew is measured at the transmitter zero cross points
6/13
Doc ID 7512 Rev 7
6
4
30
30
V/µs
V/µs
ST3222B - ST3222C
4
Application
Application
Figure 2.
Application circuits
CS02200
Table 9.
Capacitance value (µF)
C1
C2
C3
C4
Cbypass
0.1
0.1
0.1
0.1
0.1
Doc ID 7512 Rev 7
7/13
Application
4.1
Figure 3.
Figure 5.
8/13
ST3222B - ST3222C
Typical performance characteristics
(unless otherwise specified TJ = 25 °C)
Figure 4.
Driver voltage transfer
characteristics for transmitter
inputs
Driver voltage transfer
characteristics for receiver inputs
Output current vs. output low
voltage
Output current vs. output high
voltage
Figure 6.
Doc ID 7512 Rev 7
ST3222B - ST3222C
5
Package mechanical data
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Doc ID 7512 Rev 7
9/13
Package mechanical data
Table 10.
ST3222B - ST3222C
TSSOP20 package mechanical data
mm.
in.
Dim.
Min.
Typ.
Max.
A
Min.
Typ.
1.2
A1
0.05
A2
0.8
b
Max.
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0079
D
6.4
6.5
6.6
0.252
0.256
0.260
E
6.2
6.4
6.6
0.244
0.252
0.260
E1
4.3
4.4
4.48
0.169
0.173
0.176
1
e
0.65 BSC
K
0°
L
0.45
Figure 7.
0.0256 BSC
0.60
8°
0°
0.75
0.018
8°
0.024
0.030
TSSOP20 package mechanical drawing
A
A2
A1
b
K
e
L
E
c
D
E1
PIN 1 IDENTIFICATION
1
0087225C
10/13
Doc ID 7512 Rev 7
ST3222B - ST3222C
Table 11.
Package mechanical data
Tape and reel TSSOP20 mechanical data
mm.
in.
Dim.
Min.
A
Typ.
Max.
Min.
Typ.
330
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Max.
0.504
22.4
0.519
0.882
A0
6.8
7
0.268
0.276
B0
6.9
7.1
0.272
0.280
K0
1.7
1.9
0.067
0.075
P0
3.9
4.1
0.153
0.161
P
11.9
12.1
0.468
0.476
Figure 8.
Tape and reel schematic TSSOP20
Note: Drawing not to scale
Doc ID 7512 Rev 7
11/13
Revision history
ST3222B - ST3222C
6
Revision history
Table 12.
Document revision history
Date
Revision
22-Mar-2006
5
Order codes updated.
21-Jan-2008
6
Modified: Table 3 and added Table 1.
25-Aug-2010
7
Updated Table 4, ECOPACK® text in Section 5: Package mechanical data;
reformatted document, minor textual changes.
12/13
Changes
Doc ID 7512 Rev 7
ST3222B - ST3222C
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Doc ID 7512 Rev 7
13/13