參數(shù)資料
型號: X4283V8-2.7A
廠商: INTERSIL CORP
元件分類: 電源管理
英文描述: CPU Supervisor with 128K EEPROM
中文描述: 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
封裝: PLASTIC, TSSOP-8
文件頁數(shù): 3/22頁
文件大小: 412K
代理商: X4283V8-2.7A
X4283/85 – Preliminary Information
Characteristics subject to change without notice.
3 of 22
REV 1.17 11/27/00
www.xicor.com
PRINCIPLES OF OPERATION
Power On Reset
Application of power to the X4283/85 activates a Power
On Reset Circuit that pulls the RESET/RESET pin
active. This signal provides several benefits.
– It prevents the system microprocessor from starting
to operate with insufficient voltage.
– It prevents the processor from operating prior to sta-
bilization of the oscillator.
– It allows time for an FPGA to download its configura-
tion prior to initialization of the circuit.
– It prevents communication to the EEPROM, greatly
reducing the likelihood of data corruption on power up.
When V
CC
exceeds the device V
for 200ms (nominal) the circuit releases RESET/
RESET allowing the system to begin operation.
TRIP
threshold value
LOW VOLTAGE MONITORING
During operation, the X4283/85 monitors the V
and asserts RESET/RESET if supply voltage falls
below a preset minimum V
signal prevents the microprocessor from operating in a
power fail or brownout condition. The RESET/RESET
signal remains active until the voltage drops below 1V.
It also remains active until V
V
TRIP
for 200ms.
CC
level
TRIP
. The RESET/RESET
CC
returns and exceeds
WATCHDOG TIMER
The Watchdog Timer circuit monitors the microproces-
sor activity by monitoring the SDA and SCL pins. The
microprocessor must toggle the SDA pin HIGH to LOW
periodically, while SCL is HIGH (this is a start bit) prior
to the expiration of the watchdog time out period to pre-
vent a RESET/RESET signal. The state of two nonvola-
tile control bits in the Status Register determine the
watchdog timer period. The microprocessor can change
these watchdog bits, or they may be “l(fā)ocked” by tying
the WP pin HIGH.
EEPROM INADVERTENT WRITE PROTECTION
When RESET/RESET goes active as a result of a low
voltage condition or Watchdog Timer Time-Out, any in-
progress communications are terminated. While
RESET/RESET is active, no new communications are
allowed and no nonvolatile write operation can start.
Non-volatile writes in-progress when RESET/RESET
goes active are allowed to finish.
Additional protection mechanisms are provided with
memory Block Lock and the Write Protect (WP) pin.
These are discussed elsewhere in this document.
V
CC
THRESHOLD RESET PROCEDURE
The X4283/85 is shipped with a standard V
old (V
TRIP
) voltage. This value will not change over nor-
mal operating and storage conditions. However, in
applications where the standard V
right, or if higher precision is needed in the V
value, the X4283/85 threshold may be adjusted. The
procedure is described below, and uses the application
of a nonvolatile control signal.
CC
thresh-
TRIP
is not exactly
TRIP
Figure 1. Set V
TRIP
Level Sequence (V
CC
= desired V
TRIP
values WEL bit set)
0 1 2 3 4 5 6 7
SCL
SDA
A0h
0 1 2 3 4 5 6 7
00h
WP
V
P
= 12-15V
0 1 2 3 4 5 6 7
01h
0 1 2 3 4 5 6 7
00h
相關PDF資料
PDF描述
X4283V8-4.5A CPU Supervisor with 128K EEPROM
X4283V8I-2.7 CPU Supervisor with 128K EEPROM
X4285V8I-2.7 CPU Supervisor with 128K EEPROM
X4285V8-2.7 CPU Supervisor with 128K EEPROM
X4285V8-2.7A CPU Supervisor with 128K EEPROM
相關代理商/技術參數(shù)
參數(shù)描述
X4283V8-4.5A 功能描述:IC SUPERVISOR CPU 128K EE 8TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP(0.173",4.40mm 寬) 供應商設備封裝:8-TSSOP 包裝:管件
X4283V8I 功能描述:IC SUPERV 128K EE RST LO 8TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:低有效 復位超時:標準傳輸延遲為 60 µs 電壓 - 閥值:3V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A,SOT-753 供應商設備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR
X4283V8I-2.7 功能描述:IC SUPERVISOR CPU 128K EE 8TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP(0.173",4.40mm 寬) 供應商設備封裝:8-TSSOP 包裝:管件
X4283V8I-2.7A 功能描述:IC SUPERVISOR CPU 128K EE 8TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP(0.173",4.40mm 寬) 供應商設備封裝:8-TSSOP 包裝:管件
X4283V8I-4.5A 功能描述:IC SUPERVISOR CPU 128K EE 8TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP(0.173",4.40mm 寬) 供應商設備封裝:8-TSSOP 包裝:管件