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EN

VDD

1

DRB PACKAGE

(TOP VIEW)

NC − No internal connection

2

3

4

8

7

6

5

XIN

NC

XOUT

SDATA

VSS

FOUT

P0012-01

CDCE401

SCAS820 – JUNE 2006

An on-die EEPROM enables nonvolatile storage of the frequency setting. For the transfer of the programming

into the EEPROM, the CDCE401 takes advantage of the SDATA input. In-circuit programming of the device is

possible.

Unlike other EEPROM-based devices, it is not necessary to apply a high supply voltage to the device in order to

program it.

The CDCE401 accepts crystals from 20 MHz up to 100 MHz. For lower frequencies, the CDCE401 provides a

programmable post-divider.

The CDCE401 features a wide supply-voltage range. This makes the device ideal to use at today’s most

commonly used supply voltage of 2.5 V, and operation at supply voltages of 2.8 V, 2.85 V, and 3 V for cellular

applications can be addressed with a single device. Therefore, use of the device in multiple different application

spaces is possible, reducing inventory costs.

The CDCE401 is characterized to work in the industrial temperature range from –40°C to 85°C.

Optional: QFN Package Terminal Assignment

For evaluation purposes, the CDCE401 is also available in a QFN package. The packaged device can be

obtained together with an EVM.

Table 1. TERMINAL FUNCTIONS

TERMINAL

NUMBER

TYPE

DESCRIPTION

NAME

QFN

BOND PAD

Logic select pin. Enables/disables device. Has a hysteresis of 300 mV. A

EN

1

1

Input LVCMOS

2-M

Ω pullup resistor is built in.

FOUT

5

5

Output LVCMOS

Frequency output

NC

7

N/A

Not connected

Logic select pin. This input serves as programming input. Has a

SDATA

6

7

Input LVCMOS

hysteresis of 300 mV. A 2-M

Ω pullup resistor is built in.

VDD

8

8

Power

Voltage supply

VSS

4

4

Ground

Ground

XIN

2

2

Input oscillator

Crystal oscillator input

XOUT

3

3

Output oscillator

Crystal oscillator output

2

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