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參數資料
| 型號： | X25325 |
| 英文描述： | Programmable Watchdog Timer & V CC Supervisory Circuit w/Serial E 2 PROM |
| 中文描述： | 可編程看門狗定時器 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 76K |
| 代理商： | X25325 |
7049 -1.0 6/20/97 T0/C0/D0 SH
Xicor, Inc. 1994, 1995, 1996 Patents Pending
1
Characteristics subject to change without notice
64K
32K
16K
Programmable Watchdog Timer & V
X25643/45
X25323/25
X25163/65
8K x 8 Bit
4K x 8 Bit
2K x 8 Bit
CC
Supervisory Circuit w/Serial E
2
PROM
FEATURES
Programmable Watchdog Timer
Low Vcc Detection and Reset Assertion
—Reset Signal Valid to Vcc=1V
Save Critical Data With Block Lock
—Block Lock
Protect 0, 1/4, 1/2 or all of
Serial E
PROM Memory Array
In Circuit Programmable ROM Mode
Long Battery Life With Low Power Consumption
—<50
μ
A Max Standby Current, Watchdog On
—<1
μ
A Max Standby Current, Watchdog Off
—<5mA Max Active Current during Write
—<400
μ
A Max Active Current during Read
1.8V to 3.6V, 2.7V to 5.5V and 4.5V to 5.5V Power
Supply Operation
2MHz Clock Rate
Minimize Programming Time
—32 Byte Page Write Mode
—Self-Timed Write Cycle
—5ms Write Cycle Time (Typical)
SPI Modes (0,0 & 1,1)
Built-in Inadvertent Write Protection
—Power-Up/Power-Down Protection Circuitry
—Write Enable Latch
—Write Protect Pin
High Reliability
Available Packages
—14-Lead SOIC (X2564x)
—14-Lead TSSOP (X2532x, X2516x)
—8-Lead SOIC (X2532x, X2516x)
TM
Protection
TM
2
DESCRIPTION
These devices combine three popular functions, Watch-
dog Timer, Supply Voltage Supervision, and Serial
E
PROM Memory in one package. This combination low-
ers system cost, reduces board space requirements, and
increases reliability.
2
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. During a system failure,
the device will respond with a RESET/RESET signal
after a selectable time-out interval. The user selects the
interval from three preset values. Once selected, the
interval does not change, even after cycling the power.
The user’s system is protected from low voltage condi-
tions by the device’s low Vcc detection circuitry. When
Vcc falls below the minimum Vcc trip point, the system is
reset. RESET/RESET is asserted until Vcc returns to
proper operating levels and stabilizes.
The memory portion of the device is a CMOS Serial
E
PROM array with Xicor’s Block Lock
array is internally organized as x 8. The device features a
Serial Peripheral Interface (SPI) and software protocol
allowing operation on a simple four-wire bus.
2
TM
Protection. The
The device utilizes Xicor’s proprietary Direct Write
providing a minimum endurance of 100,000 cycles per
sector and a minimum data retention of 100 years.
TM
cell,
BLOCK DIAGRAM
DATA
REGISTER
COMMAND
DECODE &
CONTROL
LOGIC
RESET
CONTROL
LOW
VOLTAGE
SENSE
PROGRAMMING,
BLOCK LOCK &
ICP ROM CONTROL
X - DECODE
LOGIC
STATUS
REGISTER
WATCHDOG
TIMER
PAGE DECODE LOGIC
SERIAL
E
PROM
ARRAY
2
HIGH
VOLTAGE
CONTROL
SI
SO
SCK
CS
RESET/RESET
V
CC
WP
7036 FRM 01
32
8
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相關代理商/技術參數 |
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| X25325S14 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Programmable Watchdog Timer & V CC Supervisory Circuit w/Serial E 2 PROM |
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| X25325S14I-1.8 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Programmable Watchdog Timer & V CC Supervisory Circuit w/Serial E 2 PROM |
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