Page 1
Low voltage low on-resistance SPDT switch
Features
■ High speed:
–t
= 0.3 ns (max) at VCC = 4.5 V
PD
–t
= 0.8 ns (max) at VCC = 3.0 V
PD
–t
= 1.2 ns (max) at VCC = 2.3 V
PD
■ Ultra low power dissipation:
–I
= 1 µA (max) at TA = 85 °C
CC
■ Low on-resistance; at V
–R
–R
■ Wide operating voltage range:
–V
■ TTL threshold ON control input at
V
■ Pin and function compatible with 74 series
= 7 Ω (max TA = 85 °C) at VCC = 4.5 V
ON
= 9 Ω (max TA = 85 °C) at VCC = 3.0 V
ON
(OPR) = 1.65 V to 5.5 V single supply
CC
= 2.7 to 3.6 V
CC
3157
■ Latch-up performance exceeds
150 mA (JESD 17)
Description
= 0 V:
IN
STG3157
with break-before-make feature
SOT323-6L
(connected to common port D) when the IN input
is held high, and OFF (a high impedance state
exists between the two ports) when IN is held low.
Switch S2 is ON (connected to common port D)
when the IN input is held low and OFF (a high
impedance state exists between the two ports)
when IN is held high.
Additional key features are fast switching speed,
break-before-make delay time, and very low
power consumption. All inputs and outputs are
equipped with protection circuits to protect
against static discharge, giving them immunity
from ESD and transient excess voltage.
The STG3157 is a high-speed CMOS analog
SPDT (single-pole double-throw) switch or 2:1
multiplexer/demultiplexer bus switch
manufactured using silicon gate C
2
MOS
technology. It is designed to operate from a
1.65 V to 5.5 V supply, making the device ideal for
portable applications.
The STG3157 features very low on-resistance
(< 9 Ω) at V
= 3.0 V. The IN input is provided to
CC
control the SPDT switch, and is compatible with
standard CMOS output. Switch S1 is ON
Table 1. Device summary
April 2010 Doc ID 9007 Rev 2 1/18
Order code Package Packing
STG3157CTR SOT323-6L Tape and reel
www.st.com
18
Page 2
Contents STG3157
Contents
1 Pin connections and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 DC Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 AC Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Analog switch characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2/18 Doc ID 9007 Rev 2
Page 3
STG3157 Pin connections and functions
1 Pin connections and functions
Figure 1. Pin connections and IEC logic symbols
Table 2. Truth table
IN Switch S1 Switch S2
HONOFF
LOFF
(1)
(1)
ON
1. High impedance
Table 3. Pin descriptions
Pin Nº Symbol Name and function
1, 3 S1, S2 Independent channels
4 D Common channels
6INControl
5V
CC
2 GND Ground (0 V)
Figure 2. Input equivalent circuit
Positive supply voltage
Doc ID 9007 Rev 2 3/18
Page 4
Electrical ratings STG3157
2 Electrical ratings
Stressing the device above the ratings listed in the “Absolute maximum ratings” table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability. Refer also to the STMicroelectronics SURE
Program and other relevant quality documents.
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
V
V
IC
V
O
I
IKC
I
IK
I
OK
I
O
I
or I
CC
T
stg
T
L
Supply voltage -0.5 to +7.0 V
DC input voltage -0.5 to VCC + 0.5 V
I
DC control input voltage -0.5 to VCC + 0.5 V
DC output voltage -0.5 to VCC + 0.5 V
DC input diode current on control pin (V
DC input diode current (V
< 0V) ±50 mA
IN
< 0V) ±50 mA
IN
DC output diode current ±20 mA
DC output current +128 mA
DC VCC or ground current ±100 mA
GND
Storage temperature -65 to 150 °C
Lead temperature (10 s) 300 °C
Table 5. Recommended operating conditions
Symbol Parameter Value Unit
V
CC
V
V
IC
V
O
T
op
dt/dv
1. Truth table guaranteed: 1.2 V to 6.0 V
Supply voltage
Input voltage 0 to V
I
Control input voltage 0 to 5.5 V
Output voltage 0 to V
Operating temperature -55 to 125 °C
Input rise and fall time
control input
(1)
= 1.65V to 2.7V 0 to 20
V
CC
= 3.0 to 4.5V 0 to 10
V
CC
1.65 to 4.5 V
CC
CC
V
V
ns/V
4/18 Doc ID 9007 Rev 2
Page 5
STG3157 Electrical characteristics
3 Electrical characteristics
3.1 DC Electrical characteristics
Table 6. DC specifications
Test conditions Value
Symbol Parameter
V
IH
V
IL
R
ON
ΔR
ON
High level
input
voltage
Low level
input
voltage
Switch onresistance
Onresistance
match
between
channels
TA = 25°C -40 to 85°C -55 to 125°C
Vcc (V)
Min. Typ. Max. Min. Max. Min. Max.
1.65-1.95 0.75V
CC
CC
0.75V
0.7V
CC
CC
0.75V
0.7V
CC
CC
2.7-3.6 2 2 2
1.65-1.95 0.25V
CC
CC
0.25V
0.3V
CC
CC
0.25V
0.3V
2.7-3.6 0.8 0.8 0.8
V
= 0V
4.5
3.0
S
= 30mA
I
S
= 2.4V
V
S
IS = 30mA
V
= 4.5V
S
IS = 30mA
= 0V
V
S
= 100mA
I
S
= 3V
V
S
IS = 24mA
V
= 0V
S
IS = 8mA
4.4 7 7 9
4.9 12 12 14.5
6.1 15 15 18
5.2 9 9 11
7.8 20 20 24
6.5 12 12 14.5
2.3
= 2.3V
V
1.65
4.5
3.0
2.3
1.65
S
= 8mA
I
S
= 0V
V
S
= 4mA
I
S
V
= 1.65V
S
IS = 4mA
= 3.15V
V
S
= 30mA
I
S
= 2.1V
V
S
IS = 24mA
V
= 1.6V
S
IS = 8mA
= 1.15V
V
S
= 4mA
I
S
9.6 30 30 36
9.0 20 20 24
14 50 50 60
0.10
0.10
0.20
0.35
CC
Unit
V2.3-2.5 0.7V
CC
V2.3-2.5 0.3V
Ω
Ω
Doc ID 9007 Rev 2 5/18
Page 6
Electrical characteristics STG3157
Table 6. DC specifications (continued)
Test conditions Value
Symbol Parameter
On-
R
FLAT
resistance
flatness
OFF state
OFF
leakage
I
current
Input
I
leakage
IN
current
Quiescent
I
supply
CC
current
Vcc (V)
5.0
3.3
2.5
1.8
1.65-195
0 - 5.5
1.65 - 4.3
= 0V to
V
S
V
CC
IS = 30mA
= 0V to
V
S
V
CC
IS = 24mA
= 0V to
V
S
V
CC
IS = 8mA
= 0V to
V
S
V
CC
IS = 4mA
V
= 0 to
S
V
CC
V
= 0 to
IN
5.5V
V
= VCC
IN
or GND
TA = 25°C -40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
3
6
14
80
±0.05
±0.05
±0.1 ±1 ±10 μA
±0.1 ±1 ±10 μA
1110μA
Unit
Ω
6/18 Doc ID 9007 Rev 2
Page 7
STG3157 Electrical characteristics
3.2 AC Electrical characteristics
CL = 50 pF, RL = 500 Ω
Table 7. AC specification
Test conditions Value
Symbol Parameter
PZL
PLZ
PHZ
t
D
HL
,
,
Propagation
delay
Output enable
time (D to Sn)
Output disable
time (D to Sn)
Break-beforemake time delay
tLH, t
t
PZH
t
t
t
Q Charge injection
TA = 25°C -40 to 85°C -55 to 125°C
Unit
Vcc (V)
Min. Typ. Max. Min. Max. Min. Max.
1.65-1.95
2.3-2.7 1.2 1.2 1.8
V
= Open ns
3.0-3.3 0.8 0.8 1.2
I
4.5-5.5 0.3 0.3 0.5
1.65-1.95 7 15 7 20 7 27
2.3-2.7 3.5 11 3.5 14 3.5 17
ns
3.0-3.3 2.5 7 2.5 7.6 2.5 9
4.5-5.5 1.7 5.2 1.7 5.7 1.7 7
1.65-1.95 3 10 3 13 3 16
2.3-2.7 2 7 2 7.5 2 9
ns
3.0-3.3 1.5 5 1.5 5.3 1.5 6.5
4.5-5.5 1.7 3.5 1.7 3.8 1.7 5
1.65-5.5 0.5 0.5 0.5 ns
523
pC
3.3 19
Doc ID 9007 Rev 2 7/18
Page 8
Electrical characteristics STG3157
3.3 Analog switch characteristics
CL = 5 pF, RL = 50 Ω, TA = 25 °C
Table 8. Analog switch characteristics
Test conditions Value
Symbol Parameter
Vcc (V)
OIRR Off isolation 1.65-5.5
Xtalk Crosstalk 1.65-5.5
BW
-3dB
bandwidth
1.65-5.5 R
Control pin
CIN
input
capacitance
Sn
Sn port
capacitance
5.0 f = 1MHz 13
C
D port
capacitance
C
D
when switch is
5.0 f = 1MHz 21
enabled
TA = 25°C -40 to 85°C -55 to 125°C
Unit
Min. Typ. Max. Min. Max. Min. Max.
R
= 50Ω
L
f = 10MHz
= 50Ω
R
L
f = 10MHz
= 50Ω 250 MHz
L
-57 dB
-54 dB
5
pF
8/18 Doc ID 9007 Rev 2
Page 9
STG3157 Test circuits
4 Test circuits
Figure 3. On-resistance Figure 4. Bandwidth
Figure 5. OFF leakage Figure 6. Channel-to-channel crosstalk
Figure 7. OFF isolation Figure 8. ON leakage
Doc ID 9007 Rev 2 9/18
Page 10
Test circuits STG3157
Figure 9. Test circuit
Table 9. Test circuit
Test Switch
t
, t
PLH
PHL
, t
t
PZL
PLZ
t
, t
PZH
PHZ
Note: CL = 5/35 pF or equivalent: (includes jig capacitance)
R
= 50 Ω or equivalent
L
R
= Z
T
of pulse generator (typically 50 Ω)
OUT
Figure 10. Break-before-make time delay
Open
V
CC
GND
10/18 Doc ID 9007 Rev 2
Page 11
STG3157 Test circuits
Figure 11. Switching time and charge injection
Figure 12. Charge injection (V
GEN
= 0 V, R
= 0 Ω, RL = 1 MΩ, CL = 100 pF)
GEN
Doc ID 9007 Rev 2 11/18
Page 12
Package information STG3157
5 Package information
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.
12/18 Doc ID 9007 Rev 2
Page 13
STG3157 Package information
Table 10. SOT323-6L mechanical data
mm. inch
Dim.
Min. Typ. Max. Min. Typ. Max.
A 0.80 1.10 31.5 43.3
A1 0.00 0.10 0.0 3.9
A2 0.80 1.00 31.5 39.4
b 0.15 0.30 5.9 11.8
C 0.10 0.18 3.9 7.1
D 1.80 2.20 70.9 86.6
E 1.80 2.40 70.9 94.5
E1 1.15 1.35 45.3 53.1
e 0.65 25.6
e1 1.3 51.2
L 0.10 0.30 3.9 11.8
Figure 13. Package dimensions
Doc ID 9007 Rev 2 13/18
Page 14
Package information STG3157
Table 11. SOT323-6L footprint recommendation
Dim. mm. inch
A 2.88 0.113
B 0.78 0.031
C 0.36 0.014
D 0.65 0.026
E 1.05 0.041
F 1.65 0.065
Figure 14. SOT323-6L footprint recommendation
14/18 Doc ID 9007 Rev 2
Page 15
STG3157 Package information
Table 12. SOT323-6L tape information
Dim mm. inch
D 1.50 +0.1/0 0.059 +0.004/0
E 1.75 ±0.1 0.069 ±0.004
Po 4.00 ±0.1 0.157 ±0.004
T max. 0.40 0.016
D1 min. 1 0.039
F 3.5 ±0.05 0.138 ±0.002
K max. 2.40 0.094
P2 2.00 ±0.05 0.079 ±0.002
R 25 0.984
W 8.00 ±0.30 0.315 ±0.012
P1 4.00 0.157
Ao, Bo, Ko 0.05 min to 0.50 max 0.002 min to 0.020 max
Figure 15. SOT323-6L tape information
Doc ID 9007 Rev 2 15/18
Page 16
Package information STG3157
Table 13. SOT323-6L reel information
Dim mm. inch
Tape size 8.0 ±0.30 0.315 ±0.012
A max. 180.0 7.086
B min. 1.5 0.059
C 13.0 ±0.20 0.512 ±0.008
D min. 20.2 0.795
N min. 60 2.362
G 8.4 +2/-0 0.319 +0.079/-0
T max. 14.4 0.567
Figure 16. SOT323-6L reel information
16/18 Doc ID 9007 Rev 2
Page 17
STG3157 Revision history
6 Revision history
Table 14. Document revision history
Date Revision Changes
02-Sep-2002 1 Initial release.
Document reformatted.
In the Features list on the coverpage, updated the “Latch-up
performance exceeds” value from 300 mA to 150 mA.
19-Apr-2010 2
Minor text changes throughout the document.
Replaced Order codes table on the coverpage with Ta b le 1 :
Device summary.
®
Added ECOPACK
statement in Section 5: Package
information.
Doc ID 9007 Rev 2 17/18
Page 18
STG3157
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18/18 Doc ID 9007 Rev 2
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