ASM2I99446 datasheet(3/14 Pages) ALSC

3 / 14 page

July 2005

ASM2I99446

rev 0.4

2.5V and 3.3V LVCMOS Clock Distribution Buffer

3 of 14

Notice: The information in this document is subject to change without notice.

Table 1: Pin Configuration

Pin Number

I/O

Type

Function

3,4

CCLK0, CCLK1

Input

LVCMOS

LVCMOS clock inputs

5,6,7

FSELA, FSELB, FSELC

Input

LVCMOS

Output bank divide select input

MR/OE

Input

LVCMOS

Internal reset and output (high impedance)

control

8,11,15,20,24,27,31

GND

Supply

Negative voltage supply (GND)

25,29

18,22

9,13,17

VCCA,

VCCB,

VCCC

Supply

Positive voltage supply for output banks

VCC

Supply

Positive voltage supply for core (VCC)

30,28, 26

QA0 - QA2

Output

LVCMOS

Bank A outputs

23,21,19

QB0 - QB2

Output

LVCMOS

Bank B outputs

10,12,14,16

QC0 - QC3

Output

LVCMOS

Bank C outputs

Note: VCCB is internally connected to VCC.

Table 2: Supported Single and Dual Supply Configurations

Supply voltage configuration

VCC

VCCA

VCCB

VCCC

GND

3.3V

Mixed voltage supply

3.3V

3.3V or 2.5V

3.3V

3.3V or 2.5V

0 V

2.5V

0 V

Note: 1 VCC is the positive power supply of the device core and input circuitry. VCC voltage defines the input threshold and levels

2 VCCA is the positive power supply of the bank A outputs. VCCA voltage defines bank A output levels

3 VCCB is the positive power supply of the bank B outputs. VCCB voltage defines bank B output levels. VCCB is internally connected to VCC.

4 VCCC is the positive power supply of the bank B outputs. VCCC voltage defines bank C output levels.

Table 3: Function Table (Controls)

Control

Default

CCLK_SEL

CCLK0

CCLK1

FSELA

fQA0:2 = fREF

f QA0:2 = fREF ÷2

FSELB

FQBO:2 = fREF

f QBO:2 = fREF ÷2

FSELC

FQCO:3 = fREF

f QCO:3 = fREF ÷2

MR/OE

Outputs enabled

Internal reset Outputs disabled (tristate)

Table 4: Absolute Maximum Ratings

Symbol

Characteristics

Min

Max

Unit

Condition

VCC

Supply Voltage

-0.3

3.6

VIN

DC Input Voltage

-0.3

VCC+0.3

VOUT

DC Output Voltage

-0.3

VCC+0.3

IIN

DC Input Current

±20

IOUT

DC Output Current

±50

Storage temperature

-65

125

°C

Note: 1 These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect

device reliability.

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