CM1223-04ST datasheet(3/13 Pages) CALMIRCO

Part #	CM1223-04ST

Description	Industry First Low Capacitance ESD Protection Arrays w/Backdrive Protection

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Manufacturer	CALMIRCO [California Micro Devices Corp]

Direct Link	http://www.calmicro.com

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08/02/06

490 N. McCarthy Blvd., Milpitas, CA 95035-5112

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Tel: 408.263.3214

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Fax: 408.263.7846

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www.cmd.com

3

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 5μA on

any I/O pin when the I/O pin voltage is greater than the

CM1223 supply voltage.

Figure 1. Backdrive Protection Diagram.

One Channel

CM1223

Integrated Backdrive

Protection Diode

D1

D2

CBULK

+

“Off

IBACKDRIVE = 0

VDD_SINK

VDD_SOURCE

I/O

Discrete Backdrive

Protection Diode

D1

D2

CBULK

+

“Off

IBACKDRIVE = 0

VDD_SINK

VDD_SOURCE

I/O

One Channel

CM1213

HOST

ASIC

Peripheral

ASIC

HOST

ASIC

Peripheral

ASIC

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