FT232R USB UART I.C. Datasheet Version 1.04

© Future Technology Devices International Ltd. 2005

Page 18

6.3 EEPROM Reliability Characteristics

The internal 1024 Bit EEPROM has the following reliability characteristics-

Table 15 - EEPROM Characteristics

Parameter Description

Value

Unit

Data Retention

15

Years

Read / Write Cycles

100,000

Cycles

6.4 Internal Clock Characteristics

The internal Clock Oscillator has the following characteristics.

Table 16 - Internal Clock Characteristics

Parameter

Value

Unit

Min

Typical

Max

Frequency of Operation

11.98

12.00

12.02

MHz****

Clock Period

83.19

83.33

83.47

ns

Duty Cycle

45

50

55

%

****Equivalent to +/-1667ppm.

Table 17 - OSCI, OSCO Pin Characteristics (Optional - Only applies if external Oscillator is used*****)

Parameter Description

Min

Typ

Max

Units

Conditions

Voh

Output Voltage High

2.8

-

3.6

V

Fosc = 12MHz

Vol

Output Voltage Low

0.1

-

1.0

V

Fosc = 12MHz

Vin

Input Switching Threshold

1.8

2.5

3.2

V

*****When supplied the device is configured to use its internal clock oscillator. Users who wish to use an external

oscillator or crystal should contact FTDI technical support.