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ST3222B
User Manual
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ST ST3222B, ST3222C User Manual

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Features
■ 300 µA supply current
■ 250 kbps minimum guarantee data rate
■ Meet EIA/TIA-232 specification down to 3 V
ST3222B ST3222C
3 to 3.6 V, low power, up to 400 kbps
RS-232 drivers and receivers
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.
TSSOP20

Table 1. Device summary

Order codes
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
Temperature
range
Package Packaging
www.st.com
1
Contents ST3222B - ST3222C
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Receiver electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 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
1EN
2C
Receiver enable control. Drive low for normal operation. Drive high to force the receivers outputs (R_OUT) into a high-impedance state.
+ Positive terminal for the first charge pump capacitor
1
3 V+ 5.5 V Generated by the charge pump.
4C
5C
6C
- Negative terminal for the first charge pump capacitor
1
+ Positive terminal for the second charge pump capacitor
2
- Negative terminal for the second charge pump capacitor
2
7 V- -5.5 V Generated by the charge pump.
8T2
OUT
9R2
10 R2
OUT
Second transmitter output voltage
Second receiver Input voltage
IN
Second receiver output voltage
11 NC Not connected
12 T2
13 T1
Second transmitter input voltage
IN
First transmitter Input voltage
IN
14 NC Not connected
15 R1
16 R1
17 T1
OUT
OUT
First receiver output voltage
First receiver input voltage
IN
First transmitter output voltage
18 GND Ground
19 V
CC
Supply voltage
20 SHDN 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
V
CC
V+ Doubled voltage terminal (V
V- Inverted voltage terminal 0.3 to -7 V
V+ +|V-| 13 V
T
IN
R
IN
T
OUT
R
OUT
t
SHORT
Supply voltage -0.3 to 6 V
- 0.3) to 7 V
CC
Transmitter input voltage range -0.3 to 6 V
Receiver input voltage range ± 25 V
Transmitter output voltage range ± 13.2 V
Receiver output voltage range -0.3 to (VCC + 0.3) V
Transmitter output short to gnd time Continuous
Note: 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 (V
, then V+, then V-) is critical, therefore it is not recommended
CC
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 (C
otherwise specified. Typical values are referred to T
- C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless
1
= 25 °C)
A
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
SUPPLY
I
SHDN
VCC power supply current
SHUTDOWN supply current
No load VCC = 3.3 V TA = 25 °C SHDN = V
CC
No load VCC = 3.3V TA = 25 °C SHDN = GND
0.3 1 mA
110µA
Table 5. Logic input electrical characteristics (C1 - C4 = 0.1 µF, VC = 3 V to 3.6 V,
T
= - 40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C)
A
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
V
HYS
I
Input logic threshold low T-IN, EN, SHDN (Note:)0.8V
IL
Input logic threshold
IH
high
Transmitter input hysteresis
Input leakage current T-IN, EN, SHDN ± 0.01 ± 1µA
IL
= 3.3 V 2 V
V
CC
0.5 V
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,
T
= -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C)
A
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
R
I
TOUT
TOUT
TSC
I
TOL
Output voltage swing
Transmitter output resistance
Output short circuit current
Output leakage current
All transmitter outputs are loaded with 3 kΩ to GND
= V+ = V- = 0 V, V
V
CC
= 0V or 3 V to 3.6 V, V
V
CC
= ± 2 V 300 10M Ω
OUT
= ± 12 V
OUT
Transmitters disable
± 5 ± 5.4 V
± 60 mA
± 25 µA
Doc ID 7512 Rev 7 5/13
Electrical characteristics ST3222B - ST3222C

3.1 Receiver electrical characteristics

Table 7. Receiver electrical characteristics (C
unless otherwise specified. Typical values are referred to T
- C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C,
1
= 25 °C)
A
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
V
V
V
V
RIHYS
R
V
V
OL
RIN
RIL
RIH
RIN
ROL
ROH
Output leakage current R-OUT, EN = VCC, receiver disabled ± 0.05 ± 10 µA
Receiver Input voltage operating range
-25 25 V
Input threshold low TA = 25 °C, VCC = 3.3 V 0.6 1.2 V
Input threshold high TA = 25 °C, VCC = 3.3 V 1.5 2.4 V
Input hysteresis 0.5 V
Input resistance TA = 25 °C 3 5 7 kΩ
TTL/CMOS output voltage low
TTL/CMOS output voltage high
= 1.6 mA 0.4 V
I
OUT
= -1 mA VCC-0.6 VCC-0.1 V
I
OUT
Table 8. 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 T
Symbol Parameter Test conditions Min. Typ. Max. Unit
= 25 °C)
A
= 3 kΩ CL2= 1000 pF
R
D
R
t
PHLR
tPLHR
|t
PHLT
- t
THL
t
OER
t
ODR
|t
PHLR
- t
THR
S
RT
Data transfer rate
Propagation delay input to output
Tr an s m it t er propagation delay
|
difference
(1)
Receiver output enable time
Receiver output disable time
Receiver propagation
|
delay difference
Transition slew rate
L
one transmitter switching
to R
R
XIN
, CL = 150 pF 0.2 µs
XOUT
Normal operation 200 ns
Normal operation 200 ns
= 25 °C, RL = 3 kΩ to 7 kΩ, VCC = 3.3 V
T
A
measured from +3 V to -3 V or -3 V to +3 V
= 150 pF to 1000 pF
C
L
CL = 150pF to 2500pF
1. Transmitter skew is measured at the transmitter zero cross points
240 400 Kbps
100 ns
50 ns
6 4
30 30
V/µs V/µs
6/13 Doc ID 7512 Rev 7
ST3222B - ST3222C Application

4 Application

Figure 2. Application circuits

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
CS02200
Application ST3222B - ST3222C

4.1 Typical performance characteristics

(unless otherwise specified TJ = 25 °C)
Figure 3. Driver voltage transfer
characteristics for transmitter inputs
Figure 4. Driver voltage transfer
characteristics for receiver inputs
Figure 5. Output current vs. output low
voltage
Figure 6. Output current vs. output high
voltage
8/13 Doc ID 7512 Rev 7
ST3222B - ST3222C Package mechanical data

5 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Doc ID 7512 Rev 7 9/13
Package mechanical data ST3222B - ST3222C

Table 10. TSSOP20 package mechanical data

mm. in.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 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
e 0.65 BSC 0.0256 BSC
K0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030

Figure 7. TSSOP20 package mechanical drawing

A2
A
PIN 1 IDENTIFICATION
A1
b
1
e
D
K
c
E1
L
E
0087225C
10/13 Doc ID 7512 Rev 7
ST3222B - ST3222C Package mechanical data

Table 11. Tape and reel TSSOP20 mechanical data

mm. in.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
A
0
B
0
K
0
P
0
6.8 7 0.268 0.276
6.9 7.1 0.272 0.280
1.7 1.9 0.067 0.075
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 Changes
22-Mar-2006 5 Order codes updated.
21-Jan-2008 6 Modified: Ta bl e 3 and added Tab le 1 .
25-Aug-2010 7
Updated Ta bl e 4 , ECOPACK reformatted document, minor textual changes.
®
text in Section 5: Package mechanical data;
12/13 Doc ID 7512 Rev 7
ST3222B - ST3222C
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Doc ID 7512 Rev 7 13/13
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