CM1223
Industry First Low Capacitance ESD Protection Arrays w/Backdrive Protection
Features
•
•
•
•
•
•
•
•
•
•
•
2, 4, and 8 channels of ESD protection with inte-
grated backdrive protection on all lines
Provides ESD protection to IEC61000-4-2 Level 4
- 8kV contact discharge
- 15kV air discharge
Low channel input capacitance of 1.0pF typical
Minimal capacitance change with temperature and
voltage
Channel I/O to Gnd capacitance difference of
0.02pF typical is ideal for differential signalsl
Mutual capacitance between signal pin and adja-
cent signal pin - 0.11pF typical
Zener diode protects supply rail and eliminates the
need for external by-pass capacitors
Pin compatible with CM1213-02, -04, and -08
Each I/O pin can withstand over 1000 ESD strikes
Available in SOT, and MSOP packages
Lead-free version available
Product Description
The CM1223 family of diode arrays has been designed
to provide ESD protection for electronic components or
sub-systems requiring minimal capacitive loading.
These devices are ideal for protecting systems with
high data and clock rates or for circuits requiring low
capacitive loading. Each ESD channel consists of a
pair of diodes in series which steer the positive or neg-
ative ESD current pulse to either the positive (V
P
) or
negative (V
N
) supply rail. A Zener diode is embedded
between V
P
and V
N
, absorbing positive ESD strikes
and also providing ESD protection for the V
P
rail. An
additional diode is added in this device to serve as
backdrive current protection. The CM1223 will protect
against ESD pulses up to
±8kV
per the IEC 61000-4-2
standard and using the MIL-STD-883D (Method 3015)
specification for Human Body Model (HBM) ESD, all
pins are protected from contact discharges of greater
than
±15kV.
These devices are particularly well-suited for protecting
systems using high-speed ports such as USB2.0,
IEEE1394 (Firewire
®
, iLink
™
), Serial ATA, DVI, HDMI
and corresponding ports in removable storage, digital
camcorders, DVD-RW drives and other applications
where extremely low loading capacitance with ESD
protection are required in a small package footprint.
The CM1223 family of devices is available with
optional lead-free finishing.
Applications
•
•
•
•
•
•
•
USB2.0 ports at 480Mbps in desktop PCs, note-
books and peripherals
IEEE1394 Firewire
®
ports at 400Mbps / 800Mbps
DVI ports, HDMI ports in notebooks, set top boxes,
digital TVs, LCD displays
UDI and Displayport
Serial ATA ports in desktop PCs and hard disk
drives
PCI Express ports
General purpose high-speed data line ESD
protection
Electrical Schematics
V
P
CH4
V
P
CH3
CH8
CH7
V
P
CH6
CH5
CH1
CH2
V
N
CM1223-02ST/SO
CM1223-02SS/SR
CH1
V
N
CH2
CH1
CH2
V
N
CH3
CH4
CM1223-04ST/SO
CM1223-04MS/MR
CM1223-08MS/MR
© 2006 California Micro Devices Corp. All rights reserved.
08/02/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
1
CM1223
PACKAGE / PINOUT DIAGRAMS
Top View
V
N
1
4
Top View
V
P
CH1
1
2
3
6
Top View
CH4
CH1
CH2
1
2
3
4
5
10
9
8
7
6
CH8
CH7
V
N
CH6
CH5
D327/
D337
CH1
2
3
D325/
D335
D326/
D336
V
N
CH2
CH2
5
4
V
P
CH3
CH3
CH4
V
P
4-Lead SOT143-4
6-Lead SOT23-6
Top View
NC
1
2
3
5
Top View
V
P
10-Lead MSOP-10
NC
CH4
V
N
NC
CH3
CH1
NC
V
P
1
2
3
4
5
10
9
8
7
6
D324/
D334
4
D328 /
D338
V
N
CH1
CH2
CH2
NC
5-Lead SOT23-5
10-Lead MSOP-10
Note: These drawings are not to scale.
Pin Descriptions
PIN DESCRIPTIONS
2-CHANNEL, 4-LEAD SOT143-4 PACKAGE
PIN
1
2
3
4
NAME
V
N
CH1
CH2
V
P
TYPE
GND
I/O
I/O
PWR
ESD Channel
ESD Channel
Positive voltage supply rail
PIN
Negative voltage supply rail
PIN
1
2
3
4
5
6
7
8
9
10
CH1
NC
V
P
CH2
NC
CH3
NC
V
N
CH4
NC
GND
I/O
I/O
PWR
I/O
4-CHANNEL, 10-LEAD MSOP-10 PACKAGE
NAME
TYPE
I/O
DESCRIPTION
ESD Channel
No connect
Positive voltage supply rail
ESD Channel
No connect
ESD Channel
No connect
Negative voltage supply rail
ESD Channel
No connect
8-CHANNEL, 10-LEAD MSOP-10 PACKAGE
PIN
1
2
3
4
5
6
7
8
9
10
NAME
CH1
CH2
CH3
CH4
V
P
CH5
CH6
V
N
CH7
CH8
TYPE
I/O
I/O
I/O
I/O
PWR
I/O
I/O
GND
I/O
I/O
DESCRIPTION
ESD Channel
ESD Channel
ESD Channel
ESD Channel
Positive voltage supply rail
ESD Channel
ESD Channel
Negative voltage supply rail
ESD Channel
ESD Channel
2-CHANNEL, 5-LEAD SOT23-5 PACKAGE
PIN
1
2
3
4
5
NAME
NC
V
N
CH1
CH2
V
P
GND
I/O
I/O
PWR
TYPE
DESCRIPTION
No connect
Negative voltage supply rail
ESD Channel
ESD Channel
Positive voltage supply rail
4-CHANNEL, 6-LEAD SOT23-6 PACKAGE
PIN
1
2
3
4
5
6
NAME
CH1
V
N
CH2
CH3
V
P
CH4
TYPE
I/O
GND
I/O
I/O
PWR
I/O
DESCRIPTION
ESD Channel
Negative voltage supply rail
ESD Channel
ESD Channel
Positive voltage supply rail
ESD Channel
© 2006 California Micro Devices Corp. All rights reserved.
2
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
08/02/06
CM1223
Backdrive protection
Backdrive protection is needed to block against back-
drive current flowing from a high potential voltage node
toward a lower potential voltage node through the inter-
face cable.
For example, consider a DVD player connected to a
TV via an HDMI interface. If the DVD player is switched
off and the TV is left on, there is a possibility of reverse
current flow back into the main power supply rail of the
DVD player. Typically, the DVD's power supply has
some form of bulk supply capacitance associated with
it. Because all CMOS logic exhibits a very high imped-
ance on the power rail node when "off", if there is very
little parasitic shunt resistance and as little as a few
milliamps of "backdrive" current flowing back into the
power rail, it is possible over time to charge that bulk
supply capacitance to some intermediate level. If this
level rises above the power-on-reset (POR) voltage
level of some of the integrated circuits, the DVD player
may not reset properly when the DVD player is turned
back on.
To avoid this situation, the CM1223 with integrated
backdrive protection diode was designed to block
backdrive current, guaranteeing no more than 5
μA
on
any I/O pin when the I/O pin voltage is greater than the
CM1223 supply voltage.
VDD_SOURCE
Discrete Backdrive
Protection Diode
“Off
One Channel
CM1213
VDD_SOURCE
VDD_SINK
Integrated Backdrive
Protection Diode
“Off
One Channel
CM1223
VDD_SINK
C
BULK
C
BULK
+
+
HOST
ASIC
D
1
I/O
D
2
I
BACKDRIVE
= 0
Peripheral
ASIC
HOST
ASIC
D
1
I/O
D
2
I
BACKDRIVE
= 0
Peripheral
ASIC
Figure 1. Backdrive Protection Diagram.
© 2006 California Micro Devices Corp. All rights reserved.
08/02/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
3
CM1223
Ordering Information
PART NUMBERING INFORMATION
Standard Finish
# of Channels
2
2
4
4
8
Leads
5
4
6
10
10
Package
SOT23-5
SOT143-4
SOT23-6
MSOP-10
MSOP-10
Ordering Part
Number
1
CM1223-02ST
CM1223-02SS
CM1223-04ST
CM1223-04MS
CM1223-08MS
Part Marking
D324
D327
D325
D328
D326
Lead-free Finish
Ordering Part
Number
1
CM1223-02SO
CM1223-02SR
CM1223-04SO
CM1223-04MR
CM1223-08MR
Part Marking
D334
D337
D335
D338
D336
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Operating Supply Voltage (V
P
- V
N
)
Operating Temperature Range
Storage Temperature Range
DC Voltage at any channel input
RATING
6.0
-40 to +85
-65 to +150
(V
N
- 0.5) to (V
P
+ 0.5)
UNITS
V
°C
°C
V
STANDARD OPERATING CONDITIONS
PARAMETER
Operating Temperature Range
Package Power Rating
SOT143-4 Package (CM1223-02SS/SR)
SOT23-5 Package (CM1223-02ST/SO)
SOT23-6 Package (CM1223-04ST/SO)
MSOP-10 Package (CM1223-04MS/MR)
MSOP-10 Package (CM1223-08MS/MR)
RATING
-40 to +85
225
225
225
400
400
UNITS
°C
mW
mW
mW
mW
mW
© 2006 California Micro Devices Corp. All rights reserved.
4
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
08/02/06
CM1223
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL PARAMETER
V
P
I
P
V
SCL
Operating Supply Voltage (V
P
-V
N
)
Operating Supply Current
Signal Clamp Voltage
Positive Transients
Negative Transients
Channel Leakage Current
Channel Input Capacitance
Channel Input Capacitance
Matching
Mutual Capacitance between sig-
nal pin and adjacent signal pin
ESD Protection
Peak Discharge Voltage at any
channel input, in system
a) Contact discharge per
IEC 61000-4-2 standard
b) Human Body Model,
MIL-STD-883, Method
3015
Channel Clamp Voltage
Positive Transients
Negative Transients
Dynamic Resistance
Positive Transients
Negative Transients
(V
P
-V
N
)=3.3V
I
F
= 8mA; T
A
=25°C
6.7
0.60
8.2
0.80
±0.1
1.0
0.02
0.11
±1.0
1.5
CONDITIONS
MIN
TYP
3.3
MAX
5.5
8.0
UNITS
V
μA
V
V
μA
pF
pF
pF
I
LEAK
C
IN
T
A
=25°C; V
P
=5V, V
N
=0V
At 1 MHz, V
P
=3.3V, V
N
=0V, V
IN
=1.65V;
Note 2 applies
At 1 MHz, V
P
=3.3V, V
N
=0V, V
IN
=1.65V;
Note 2 applies
At 1 MHz, V
P
=3.3V, V
N
=0V, V
IN
=1.65V;
Note 2 applies
Δ
C
IN
C
MUTUAL
V
ESD
Notes 2, 4 & 5; T
A
=25°C
Notes 2, 3 & 5; T
A
=25°C
±8
±15
kV
kV
V
CL
T
A
=25°C, I
PP
= 1A, t
P
= 8/20uS;
Notes 2 & 5
T
A
=25°C, I
PP
= 1A, t
P
= 8/20uS
Any I/O pin to Ground; Notes 2 & 5
+8.8
-1.4
0.7
0.4
V
V
Ω
Ω
R
DYN
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
All parameters specified at T
A
= -40°C to +85°C unless otherwise noted.
These parameters guaranteed by design and characterization.
Human Body Model per MIL-STD-883, Method 3015, C
Discharge
= 100pF, R
Discharge
= 1.5KΩ, V
P
= 3.3V, V
N
grounded.
Standard IEC 61000-4-2 with C
Discharge
= 150pF, R
Discharge
= 330Ω, V
P
= 3.3V, V
N
grounded.
These measurements performed with no external capacitor on V
P
(V
P
floating).
© 2006 California Micro Devices Corp. All rights reserved.
08/02/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
5
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