DS2153Q 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2153Q

E1 Single-Chip Transceiver

Dallas Semiconductor -> Maxim Integrated 

DS2153Q

PIN SYMBOL TYPE

DESCRIPTION

18 RCHBLK

O Receive Channel Block. A user-programmable output that can be

forced high or low during any of the 32 E1 channels. Useful for

blocking clocks to a serial UART or LAPD controller in

applications where not all E1 channels are used, such as Fractional

E1, 384 kbps service (H0), 1920 kbps (H12), or ISDN-PRI. Also

useful for locating individual channels in drop-and-insert

applications. See Section 13 for timing details.

19

ACLKI

I Alternate Clock Input. Upon a receive carrier loss, the clock

applied at this pin (normally 2.048 MHz) will be routed to the

RCLK pin. If no clock is routed to this pin, then it should be tied to

DVSS VIA A 1 kΩ resistor.

20

BTS

21

RTIP

22

RRING

23

RVDD

24

RVSS

25

XTAL1

26

XTAL2

27

INT1

28

INT2

29

TTIP

30

TVSS

31

TVDD

32

TRING

I Bus Type Select. Strap high to select Motorola bus timing; strap

low to select Intel bus timing. This pin controls the function of the

RD (DS), ALE(AS), and WR (R/ W ) pins. If BTS=1, then these pins

assume the function listed in parenthesis ().

- Receive Tip and Ring. Analog inputs for clock recovery circuitry;

connects to a 1:1 transformer (see Section 12 for details).

- Receive Analog Positive Supply. 5.0 volts. Should be tied to

DVDD and TVDD pins.

- Receive Signal Ground. 0.0 volts. Should be tied to local ground

plane.

- Crystal Connections. A pullable 8.192 MHz crystal must be

applied to these pins. See Section 12 for crystal specifications.

O Receive Alarm Interrupt 1. Flags host controller during alarm

conditions defined in Status Register 1. Active low, open drain

output.

O Receive Alarm Interrupt 2. Flags host controller during conditions

defined in Status Register 2. Active low, open drain output.

- Transmit Tip. Analog line driver output; connects to a step-up

transformer (see Section 12 for details).

- Transmit Signal Ground. 0.0 volts. Should be tied to local ground

plane.

- Transmit Analog Positive Supply. 5.0 volts. Should be tied to

DVDD and RVDD pins.

- Transmit Ring. Analog line driver outputs; connects to a step-up

transformer (see Section 12 for details).

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