ST75C520 查看數據表（PDF） - STMicroelectronics

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ST75C520

HIGH SPEED FAX MODEM DATA PUMP

STMicroelectronics 

ST75C520

I.3 - Analog Interface

Pin

Name

TXA1

TXA2

RXA1

RXA2

VCM

VREFN

VREFP

Type

O

O

I

I

I/O

I

I

Description

Transmit Analog Output 1

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).

Receive Analog Input 1

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).

Analog Common Voltage (nominal +2.5V). This input must be decoupled with respect to AGND.

Analog Negative Reference (nominal VCM - 1.25V). This input must be decoupled with respect to VCM.

Analog Positive Reference (nominal VCM+1.25V). This input must be decoupled with respect to VCM.

I.4 - V.24 Interface

Pin Name

RTS

CLK

CTS

RxD

TxD

CD

Type

I

O

O

O

I

O

Description

Request to Send. Active low.

Data Bit Clock. Falling edge coïncides with DATA change.

Clear to Send. Active low.

Receive Data

Transmit Data sampled with rising edge of CLK

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

SCIN

SCCLK

SCOUT

BOS

EOS

MC0..MC2

HALT

MCI

RDYS

EBS

CLKOUT

Type

I

I

O

I

I

I

I

O

O

I

O

Description

Scan Data Input

Scan Clock

Scan Data Output

Begin of Scan Control

End of Scan

Mode Control

Stop ST75C520 Execution

Multicycle Instruction

Ready to Scan Flag

Enable Boundary Scan. Active low (must be set low in normal mode).

Internal ST75C520 Clock (XTAL frequency divided by 2)

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