ST1394 Просмотр технического описания (PDF) - STMicroelectronics
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ST1394 Datasheet PDF : 6 Pages
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®
IPAD™
ST1394
IEEE1394 ONE PORT CABLE TERMINATION
NETWORK WITH ESD PROTECTION DIODES
MAIN APPLICATIONS
IEEE1394 line termination on:
■ Desktops
■ Notebooks
■ Digital Camcorders
■ External storage drive
■ Set Top Box
FEATURES
■ Line termination for 2 twisted pairs TPA and
TPB
■ The device complies with IEEE1394 require-
ment for differential and common more imped-
ance 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 out-
puts 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.
TPB+
TPA-
TpBias
139
TPB-
GND
TPA-
SOT23-6L
(Plastic)
Table 1: Order Code
Part Number
ST1394-01SC6
Marking
139
Figure 1: Pinout Configuration
TPA+
GND
TPB-
R1
R2
C
R5
R4
R3
TpBias
TPA-
TPB+
BENEFITS
■ Resistor matching between TPA / TPB lines.
■ Resistor matching between TPA+ / TPA-
■ Single chip devise versus 11 discretes
■ No need for additional overvoltage protection
device
■ High level of integration
Lines
TPA+ TPA- TPB+ TPB-
Rpd
GND
Zener
Capacitance
Names R1 R12 R3 R4 R5 C
Cz
Value 55Ω 55Ω 55Ω 55Ω 55Ω 250pF
5pF
Tolerance Typ. Typ. Typ. Typ. 20% 20%
Max.
Matching
Matching between 55Ω
Resistor at ±1% max
TM: IPAD is a trademark of STMicroelectronics.
October 2004
REV. 2
1/6
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