April 2010 Doc ID 9007 Rev 2 1/18
18
STG3157
Low voltage low on-resistance SPDT switch
with break-before-make feature
Features
■High speed:
–t
PD = 0.3 ns (max) at VCC = 4.5 V
–t
PD = 0.8 ns (max) at VCC = 3.0 V
–t
PD = 1.2 ns (max) at VCC = 2.3 V
■Ultra low power dissipation:
–I
CC = 1 µA (max) at TA = 85 °C
■Low on-resistance; at VIN = 0 V:
–R
ON = 7 Ω (max TA = 85 °C) at VCC = 4.5 V
–R
ON = 9 Ω (max TA = 85 °C) at VCC = 3.0 V
■Wide operating voltage range:
–V
CC (OPR) = 1.65 V to 5.5 V single supply
■TTL threshold ON control input at
VCC = 2.7 to 3.6 V
■Pin and function compatible with 74 series
3157
■Latch-up performance exceeds
150 mA (JESD 17)
Description
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 C2MOS
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 VCC = 3.0 V. The IN input is provided to
control the SPDT switch, and is compatible with
standard CMOS output. Switch S1 is ON
(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.
SOT323-6L
Table 1. Device summary
Order code Package Packing
STG3157CTR SOT323-6L Tape and reel
www.st.com
Contents STG3157
2/18 Doc ID 9007 Rev 2
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
STG3157 Pin connections and functions
Doc ID 9007 Rev 2 3/18
1 Pin connections and functions
Figure 1. Pin connections and IEC logic symbols
Figure 2. Input equivalent circuit
Table 2. Truth table
IN Switch S1 Switch S2
HONOFF
(1)
LOFF
(1)
1. High impedance
ON
Table 3. Pin descriptions
Pin NºSymbol Name and function
1, 3 S1, S2 Independent channels
4 D Common channels
6INControl
5V
CC Positive supply voltage
2 GND Ground (0 V)
Electrical ratings STG3157
4/18 Doc ID 9007 Rev 2
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
VCC Supply voltage -0.5 to +7.0 V
VIDC input voltage -0.5 to VCC + 0.5 V
VIC DC control input voltage -0.5 to VCC + 0.5 V
VODC output voltage -0.5 to VCC + 0.5 V
IIKC DC input diode current on control pin (VIN < 0V) ±50 mA
IIK DC input diode current (VIN < 0V) ±50 mA
IOK DC output diode current ±20 mA
IODC output current +128 mA
ICC or IGND DC VCC or ground current ±100 mA
Tstg Storage temperature -65 to 150 °C
TLLead temperature (10 s) 300 °C
Table 5. Recommended operating conditions
Symbol Parameter Value Unit
VCC Supply voltage (1)
1. Truth table guaranteed: 1.2 V to 6.0 V
1.65 to 4.5 V
VIInput voltage 0 to VCC V
VIC Control input voltage 0 to 5.5 V
VOOutput voltage 0 to VCC V
Top Operating temperature -55 to 125 °C
dt/dv Input rise and fall time
control input
VCC = 1.65V to 2.7V 0 to 20 ns/V
VCC = 3.0 to 4.5V 0 to 10
STG3157 Electrical characteristics
Doc ID 9007 Rev 2 5/18
3 Electrical characteristics
3.1 DC Electrical characteristics
Table 6. DC specifications
Symbol Parameter
Test conditions Value
Unit
Vcc (V)
TA = 25°C -40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
VIH
High level
input
voltage
1.65-1.95 0.75VCC 0.75VCC 0.75VCC
V2.3-2.5 0.7VCC 0.7VCC 0.7VCC
2.7-3.6 2 2 2
VIL
Low level
input
voltage
1.65-1.95 0.25VCC 0.25VCC 0.25VCC
V2.3-2.5 0.3VCC 0.3VCC 0.3VCC
2.7-3.6 0.8 0.8 0.8
RON
Switch on-
resistance
4.5
VS = 0V
IS = 30mA 4.4 7 7 9
Ω
VS = 2.4V
IS = 30mA 4.9 12 12 14.5
VS = 4.5V
IS = 30mA 6.1 15 15 18
3.0
VS = 0V
IS = 100mA 5.2 9 9 11
VS = 3V
IS = 24mA 7.8 20 20 24
2.3
VS = 0V
IS = 8mA 6.5 12 12 14.5
VS = 2.3V
IS = 8mA 9.6 30 30 36
1.65
VS = 0V
IS = 4mA 9.0 20 20 24
VS = 1.65V
IS = 4mA 14 50 50 60
ΔRON
On-
resistance
match
between
channels
4.5 VS = 3.15V
IS = 30mA 0.10
Ω
3.0 VS = 2.1V
IS = 24mA 0.10
2.3 VS = 1.6V
IS = 8mA 0.20
1.65 VS = 1.15V
IS = 4mA 0.35
Electrical characteristics STG3157
6/18 Doc ID 9007 Rev 2
Symbol Parameter
Test conditions Value
Unit
Vcc (V)
TA = 25°C -40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
RFLAT
On-
resistance
flatness
5.0
VS = 0V to
VCC
IS = 30mA
3
Ω
3.3
VS = 0V to
VCC
IS = 24mA
6
2.5
VS = 0V to
VCC
IS = 8mA
14
1.8
VS = 0V to
VCC
IS = 4mA
80
IOFF
OFF state
leakage
current
1.65-195 VS = 0 to
VCC
±0.05 ±0.1 ±1 ±10 μA
IIN
Input
leakage
current
0 - 5.5 VIN = 0 to
5.5V ±0.05 ±0.1 ±1 ±10 μA
ICC
Quiescent
supply
current
1.65 - 4.3 VIN = VCC
or GND 1110μA
Table 6. DC specifications (continued)
STG3157 Electrical characteristics
Doc ID 9007 Rev 2 7/18
3.2 AC Electrical characteristics
CL = 50 pF, RL = 500 Ω
Table 7. AC specification
Symbol Parameter
Test conditions Value
Unit
Vcc (V)
TA = 25°C -40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
tLH, tHL
Propagation
delay
1.65-1.95
VI = Open ns
2.3-2.7 1.2 1.2 1.8
3.0-3.3 0.8 0.8 1.2
4.5-5.5 0.3 0.3 0.5
tPZH,
tPZL
Output enable
time (D to Sn)
1.65-1.95 7 15 7 20 7 27
ns
2.3-2.7 3.5 11 3.5 14 3.5 17
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
tPLZ,
tPHZ
Output disable
time (D to Sn)
1.65-1.95 3 10 3 13 3 16
ns
2.3-2.7 2 7 2 7.5 2 9
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
tD
Break-before-
make time delay 1.65-5.5 0.5 0.5 0.5 ns
Q Charge injection 523 pC
3.3 19
Electrical characteristics STG3157
8/18 Doc ID 9007 Rev 2
3.3 Analog switch characteristics
CL = 5 pF, RL = 50 Ω, TA = 25 °C
Table 8. Analog switch characteristics
Symbol Parameter
Test conditions Value
Unit
Vcc (V)
TA = 25°C -40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
OIRR Off isolation 1.65-5.5 RL = 50Ω
f = 10MHz -57 dB
Xtalk Crosstalk 1.65-5.5 RL = 50Ω
f = 10MHz -54 dB
BW -3dB
bandwidth 1.65-5.5 RL = 50Ω 250 MHz
CIN
Control pin
input
capacitance
5
pF
CSn Sn port
capacitance 5.0 f = 1MHz 13
CD
D port
capacitance
when switch is
enabled
5.0 f = 1MHz 21
STG3157 Test circuits
Doc ID 9007 Rev 2 9/18
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
Test circuits STG3157
10/18 Doc ID 9007 Rev 2
Note: CL = 5/35 pF or equivalent: (includes jig capacitance)
RL = 50 Ω or equivalent
RT = ZOUT of pulse generator (typically 50 Ω)
Figure 9. Test circuit
Table 9. Test circuit
Test Switch
tPLH, tPHL Open
tPZL, tPLZ VCC
tPZH, tPHZ GND
Figure 10. Break-before-make time delay
STG3157 Test circuits
Doc ID 9007 Rev 2 11/18
Figure 11. Switching time and charge injection
Figure 12. Charge injection (VGEN = 0 V, RGEN = 0 Ω, RL = 1 MΩ, CL = 100 pF)
Package information STG3157
12/18 Doc ID 9007 Rev 2
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.
STG3157 Package information
Doc ID 9007 Rev 2 13/18
Table 10. SOT323-6L mechanical data
Dim.
mm. inch
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
Package information STG3157
14/18 Doc ID 9007 Rev 2
Figure 14. SOT323-6L footprint recommendation
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
STG3157 Package information
Doc ID 9007 Rev 2 15/18
Figure 15. SOT323-6L tape 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
Package information STG3157
16/18 Doc ID 9007 Rev 2
Figure 16. SOT323-6L reel information
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
STG3157 Revision history
Doc ID 9007 Rev 2 17/18
6 Revision history
Table 14. Document revision history
Date Revision Changes
02-Sep-2002 1 Initial release.
19-Apr-2010 2
Document reformatted.
In the Features list on the coverpage, updated the “Latch-up
performance exceeds” value from 300 mA to 150 mA.
Minor text changes throughout the document.
Replaced Order codes table on the coverpage with Ta bl e 1 :
Device summary.
Added ECOPACK® statement in Section 5: Package
information.
STG3157
18/18 Doc ID 9007 Rev 2
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