DS2188

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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 #

FREQUENCY

JAN Crystal

6323-00, JC6A14

6323-00, JC8A14

6.176 MHz

8.192 MHz

M-TRON

4575-002

4575-001

6.176 MHz

8.192 MHz

CRYSTAL SELECTION GUIDELINES FOR THE DS2188

PARAMETER

SPECIFICATION

Parallel resonant frequency

6.176 MHz (T1) or 8.192 MHz (CEPT)

Mode

Fundamental

Load capacitance

14 to 20 pF (16 pF preferred)

Tolerance

±50 ppm over 0 to 70°C

Pullability

CL = 10 pF, delta_f = +175 to +250 ppm

CL = 45 pF, delta_f = -175 to -250 ppm

Effective series resistance

40 ohms maximum for 6.176 MHz

30 ohms maximum for 8.192 MHz

Crystal cut

AT