Datasheet > IT8761E

IT8761E

更新时间： 2024-09-15 23:59:51

品牌	Logo	应用领域
其他 - ETC		PC
页数	文件大小	规格书
1页	28K
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Simple LPC I/O\|Application Note

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IT8761E 数据手册

Integrated Technology Express, Inc.

Application Note of IT8761F for

Power On Strapping Circuit

July 1, 1999

Ø Power on strapping circuit needs extra attention when a “0”

setting is selected

Description: Due to IT8761 Rev. B power on strapping pins selection, a “0”

setting may not be strapped in correctly.

Cause:

IT8761 chooses TXD1 and RTS1# pins for power on strapping

setting, since these two pin also connect to 1488/1489 type line

driver and some of the line driver internally have +12V pull up

with a 11K ohm resistor, this will cause the “0” setting not

correctly strapped.

Suggestion: (1) Choose a small enough value pull down resistor to make the

strapping line voltage below 0.5V when system is reset. A

suggested resistor value is 680 ohm.

(2) Implement a redundant gate between IT8671 and line driver

to isolate the interfere of the internal pull up of 1488/89 line

driver as following circuit.

TXD1/RTS1#

IT8761

1488/89

7407

4.7K

Page 1 of 1

ITTM-AN-99007, July. 1

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