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ST1394| Datasheet

By datasheet - April 3rd, 2008

ST1394, ST1394-01SC6

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ST1394
IEEE1394 ONE PORT CABLE TERMINATION NETWORK WITH ESD PROTECTION DIODES

IPADTM
MAIN APPLICATIONS

IEEE1394 line termination on:

TPB+ TPATpBias

Desktops Notebooks Digital Camcorders External storage drive Set Top Box

139
TPBGND TPA-

FEATURES Line termination for 2 twisted pairs TPA and TPB The device complies with IEEE1394 requirement for differential and common more impedance on TPA and TPB line Monolithic device with complete termination for one IEEE1394 connection DESCRIPTION The ST1394-01SC6 is an integrated termination network that optimizes board layout of the PHY layer in IEEE1394 one port cable application. This monolithic device is tested, according to ESD requirement described in IEC61000-4-2 standard level 2. ST1394-01SC6 device ruggedness limits overvoltage at the 1394 tranceiver inputs and outputs below acceptable limits. The ST1394-01SC6 implements IEEE1394 recommendation for line termination of TPA and TPB differential lines. Excellent matching of the termination resistor will minimize common mode noise that is needed to improve communication speed. BENEFITS

SOT23-6L (Plastic) Table 1: Order Code Part Number ST1394-01SC6

Marking 139

Figure 1: Pinout Configuration

TPA+ GND

R1 R2

TpBias TPA-

C

R5

TPB-

R4

R3

TPB+

Resistor matching between TPA / TPB lines. Resistor matching between TPA+ / TPASingle chip devise versus 11 discretes No need for additional overvoltage protection device High level of integration

Lines
Names Value

TPA+ TPA- TPB+ TPBR1 55 R12 55 Typ. R3 55 Typ. R4 55 Typ.

Rpd
R5 55 20%

GND
C 250pF 20%

Zener Capacitance
Cz 5pF Max.

Tolerance Typ.

Matching

Matching between 55 Resistor at 1% max

TM: IPAD is a trademark of STMicroelectronics.

October 2004

REV. 2

1/6


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