TP3406 datasheet(2/16 Pages) NSC

Il numero della parte	TP3406

Spiegazioni elettronici	DASL Digital Adapter for Subscriber Loops

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Produttore elettronici	NSC [National Semiconductor (TI)]

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Connection Diagram

TP3406 Package Information

TLH11725 – 2

Order Number TP3406V

See NS Package Number V28A

Pin Descriptions

Name

Description

GND

Negative power supply pin normally 0V All

analog and digital signals are referred to this

VCC

Positive power supply input which must be

a

5Vg5%

MCLK

The 2048 MHz Master Clock input which

requires a CMOS logic level clock input from

a stable source Must be synchronous with

BCLK

MCLKXTAL

This pin is the 2048 MHz Master Clock in-

put which requires either a crystal to be con-

nected between this pin and XTAL2 or a

CMOS logic level clock from a stable source

which must be synchronous with BCLK

XTAL2

This pin is the output side of the oscillator

amplifier

MBSFSC

In Master Mode this pin is the Master Burst

Sync input which may be clocked at 4 kHz

to synchronize Transmit bursts from a num-

ber of devices at the Master end only The 4

kHz should be nominally a square wave sig-

nal If not used leave this pin open In Slave

mode this pin is a short Frame Sync output

suitable for driving another DASL in Master

Mode to provide a regenerator (ie range-ex-

tender) capability

BCLK

Bit Clock logic signal which determines the

data shift rate for B channel data on the digi-

tal interface side of the device In Master

mode this pin is an input which may be any

multiple

of

8

kHz

from

256

kHz

to

2048 MHz but must be synchronous with

MCLK In Slave mode this pin is an output at

2048 MHz

FSa

In Master mode only this pin is the Transmit

Frame Sync pulse input requiring a positive

edge to indicate the start of the active chan-

nel time for transmit B channel data into Bx

FSa must be synchronous with BCLK and

MCLK In Slave mode only this pin is a digi-

Name

Description

tal output pulse which indicates the 8-bit pe-

riods of the B1 channel data transfer at both

Bx and Br

FSb

In Master mode only this pin is the Receive

Frame Sync pulse input requiring a positive

edge to indicate the start of the active chan-

nel time of the device for receive B channel

data out from Br FSb must be synchronous

with BCLK and MCLK In Slave mode only

this pin is a digital output pulse which indi-

cates the 8-bit periods of the B2 channel

data transfer at both Bx and Br

Bx

Digital input for B1 and B2 channel data to

be transmitted to the line must be synchro-

nous with BCLK

Br

Digital output for B1 and B2 channel data

received from the line

TSr LSD

In Master mode only this pin is an open-

drain output which is normally high imped-

ance but pulls low during both B channel ac-

tive receive time slots In Slave mode only

this pin is an output which is normally high

impedance and pulls low when a valid line

signal is received

Dx

Digital input for D channel data to be trans-

mitted to the line must be synchronous with

DCLK

Dr

Digital output for D channel data received

from the line Dr is a TRI-STATE output

DCLKDEN

In Master mode this pin is an input for the

16 kHz serial shift clock for D channel data

on Dx and Dr which should be synchronous

with BCLK It may also be re-configured via

the Control Register to act as an enable in-

put for clocking the D channel interface syn-

chronized to BCLK In Slave mode this is a

16 kHz clock output for D channel data

Crystal specifications 2048 MHz parallel resonant RS s 100X with a

20 pF load Crystal tolerance should be g75 ppm for aging and tempera-

ture

2

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