DS2188 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2188

T1/CEPT Jitter Attenuator

Dallas Semiconductor -> Maxim Integrated 

PIN DESCRIPTION Table 1

DS2188

PIN SYMBOL TYPE DESCRIPTION

1

DJA

I Disable Jitter Attenuation. When high, jittered data and clock at RPOS,

RNEG, and RCLK are passed directly to RRPOS, RRNEG, and RRCLK.

2 RPOS

I Receive Positive Data Input. Jittered data input. Sampled on the falling

edge of RCLK.

3 RNEG

I Receive Negative Data Input. Jittered data input. Sampled on the falling

edge of RCLK.

4 RCLK

I Receive Clock Input. Jittered input 1.544 MHz or 2.048 MHz clock.

5

BDS

I Buffer Depth Select.

0 = 128 bits

1 = 32 bits

6 TEST

I Test Input. In normal applications, this pin should be tied low.

When tied high, used to verify free running frequency of XTAL.

7 XTAL

OUT

O Crystal Frequency Output. Buffered output of the 4X crystal connected

to XTAL1 and XTAL2.

8

VSS

- Ground. 0.0V

9 XTAL1

10 XTAL2

I Crystal Connections. In T1 environments, connect a 6.176 MHz crystal

O to these pins. In CEPT environments, connect an 8.192 MHz crystal to

these pins.

11

BL

O Buffer Limit. Transitions high when the buffer fills or empties to within

either 4 bits (BDS=0) or 2 bits (BDS=1) of its capacity. Indicates that the

jitter at RCLK is greater than 120 UIpp (BDS=0) or 28 UIpp (BDS=1).

12

RST

I Reset. Negative-edge triggered; a high-low transition will recenter the

buffer. Activation of this pin may corrupt data through the DS2188.

13 RRCLK O Receive Reference Clock. Dejittered 1.544 MHz or 2.048 MHz clock.

14 RRNEG

O Receive Reference Negative Data Output. Dejittered data output.

Updated on the rising edge of RRCLK.

15 RRPOS

O Receive Reference Positive Data Output. Dejittered data output.

Updated on the rising edge of RRCLK.

16

VDD

- Positive Supply. 5.0V

CRYSTAL REQUIREMENTS

The DS2188 must have a crystal connected to the XTAL1 and XTAL2 pins. For T1 environments, the

frequency of this crystal should be 6.176 MHz. For CEPT environments, the frequency of this crystal

should be 8.192 MHz. Table 2 lists some suggested crystal manufacturers that are recommended for use

with the DS2188. Also, see DS2188 Application Note, “Operation at Speeds Greater than E1” for

additional information.

CRYSTAL MANUFACTURERS Table 2

MANUFACTURER

PART #

JAN Crystal

6323-00, JC6A14

6323-00, JC8A14

M-TRON

4575-002

4575-001

4 of 10

FREQUENCY

6.176 MHz

8.192 MHz

6.176 MHz

8.192 MHz

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