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ST75C520 Scheda tecnica(PDF) 4 Page - STMicroelectronics

Il numero della parte ST75C520
Spiegazioni elettronici  HIGH SPEED FAX MODEM DATA PUMP
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST75C520 Scheda tecnica(HTML) 4 Page - STMicroelectronics

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I.3 - Analog Interface
Pin
Name
Type
Description
TXA1
O
Transmit Analog Output 1
TXA2
O
Transmit Analog Output 2. Outputs TXA1 and TXA2 provide analog signals with maximum peak to peak
amplitude 2 x VREF, and must be followed by an external continous-time two pole smoothing filter (where
VREF =VREFP -VREFN).
RXA1
I
Receive Analog Input 1
RXA2
I
Receive Analog Input 2. The analog differential input peak to peak signal must be less than 2 x VREF.It
must be preceded by an external continous-time single pole anti-aliasing filter. This filter must be as
close as possible to the RXA1 and RXA2 Pins (where VREF =VREFP -VREFN).
VCM
I/O
Analog Common Voltage (nominal +2.5V). This input must be decoupled with respect to AGND.
VREFN
I
Analog Negative Reference (nominal VCM - 1.25V). This input must be decoupled with respect to VCM.
VREFP
I
Analog Positive Reference (nominal VCM+1.25V). This input must be decoupled with respect to VCM.
I.4 - V.24 Interface
Pin Name
Type
Description
RTS
I
Request to Send. Active low.
CLK
O
Data Bit Clock. Falling edge coïncides with DATA change.
CTS
O
Clear to Send. Active low.
RxD
O
Receive Data
TxD
I
Transmit Data sampled with rising edge of CLK
CD
O
Carrier Detect. Active low.
I.5 - Miscellaneous
Pin Name
Type
Description
XTAL
O
Internal Oscillator Output. Left open if not used.
EXTAL
I
Internal Oscillator Input, or External Clock
EYEX
O
Constellation X analog coordinate
EYEY
O
Constellation Y analog coordinate
TEST1
To be left open
TEST2
To be left open
Note : The nominal external clock frequency of the ST75C520 is 29.4912MHz with a precision better than
± 5.10-5
I.6 - Boundary Scan Interface
A set of 13 signals are dedicated for Testing the ST75C520 Component. These signals can be used in a
development phase, associated with the SGS-THOMSON ST18932 Boundary Scan Development Tools,
to Debug the application Hardware and Software. If not used all input signals must be grounded and all
output signals left open.
Pin Name
Type
Description
SCIN
I
Scan Data Input
SCCLK
I
Scan Clock
SCOUT
O
Scan Data Output
BOS
I
Begin of Scan Control
EOS
I
End of Scan
MC0..MC2
I
Mode Control
HALT
I
Stop ST75C520 Execution
MCI
O
Multicycle Instruction
RDYS
O
Ready to Scan Flag
EBS
I
Enable Boundary Scan. Active low (must be set low in normal mode).
CLKOUT
O
Internal ST75C520 Clock (XTAL frequency divided by 2)
ST75C520
4/45


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