X5643S14-2.7A Xicor, X5643S14-2.7A Datasheet

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X5643S14-2.7A

Manufacturer Part Number
X5643S14-2.7A
Description
CPU Supervisor with 64Kbit SPI EEPROM
Manufacturer
Xicor
Datasheet
Replaces X25643/X25645
FEATURES
• Selectable watchdog timer
• Low V
• Determine watchdog or low voltage reset with a
• Long battery life with low power consumption
• 64Kbits of EEPROM
• Built-in inadvertent write protection
• 2MHz SPI interface modes (0,0 & 1,1)
• Minimize EEPROM programming time
• 2.7V to 5.5V and 4.5V to 5.5V power supply
• Available packages
BLOCK DIAGRAM
REV 1.1.1 3/5/01
CS/WDI
—Five standard reset threshold voltages
—Re-program low V
—Reset signal valid to V
volatile flag bit
—<50µA max standby current, watchdog on
—<1µA max standby current, watchdog off
—<400µA max active current during read
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2 or all of EEPROM array with
—In circuit programmable ROM mode
—32-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
operation
—8-lead PDIP, 14-lead SOIC
using special programming sequence
Block Lock
SCK
V
WP
SO
CC
SI
CC
detection and reset assertion
protection
CC
V
CC
Command
Reset logic
Decode &
Register
Control
CPU Supervisor with 64Kbit SPI EEPROM
reset threshold voltage
Logic
Data
Threshold
CC
= 1V
Watchdog Transition
Detector
V
X5643/X5645
TRIP
www.xicor.com
Protect Logic
Register
16Kbits
16Kbits
32Kbits
+
Status
-
DESCRIPTION
These devices combine four popular functions, Power-
on Reset Control, Watchdog Timer, Supply Voltage
Supervision, and Block Lock Protect Serial EEPROM
Memory in one package. This combination lowers sys-
tem cost, reduces board space requirements, and
increases reliability.
Applying power to the device activates the power on
reset circuit which holds RESET/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcon-
troller fails to restart a timer within a selectable time out
interval, the device activates the RESET/RESET signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even after
cycling the power.
The device’s low V
user’s system from low voltage conditions, resetting
the system when V
trip point. RESET/RESET is asserted until V
to proper operating level and stabilizes. Five industry
standard V
Xicor’s unique circuits allow the threshold to be repro-
grammed to meet custom requirements or to fine-tune
the threshold for applications requiring higher precision.
Power On and
Low Voltage
Timer Reset
Watchdog
Generation
Watchdog
TRIP
Timebase
Reset &
Reset
thresholds are available, however,
Characteristics subject to change without notice.
CC
CC
detection circuitry protects the
falls below the minimum V
X5643 = RESET
X5645 = RESET
RESET/RESET
CC
returns
1 of 19
CC

Related parts for X5643S14-2.7A

X5643S14-2.7A Summary of contents

Page 1

... RESET/RESET is asserted until V to proper operating level and stabilizes. Five industry standard V TRIP Xicor’s unique circuits allow the threshold to be repro- grammed to meet custom requirements or to fine-tune the threshold for applications requiring higher precision. Watchdog Transition Watchdog ...

Page 2

... HIGH or LOW longer than the selectable watchdog time out period. A falling edge of CS will reset the watchdog timer. RESET/RESET goes active on power up at about 1V and remains active for 200ms after the power supply stabilizes internal connections www.xicor.com 14-Lead SOIC ...

Page 3

... SCK pin HIGH. RESET/RESET and SO pins are left unconnected. Then apply the programming voltage V then HIGH. Remove V Figure 2. Reset V threshold CC value, the X5643 higher voltage is 4.4V and the TRIP www.xicor.com voltage, apply the desired V TRIP and the sequence is complete. P Voltage TRIP SCK ...

Page 4

... Apply Decrement 10mV RESET pin goes active? YES Error ≥ Emax Measured V - TRIP Desired V TRIP Error < Emax DONE www.xicor.com New V Applied = CC Old V Applied - Error CC Execute Reset V TRIP Sequence Error > Emax Characteristics subject to change without notice ...

Page 5

... Program SPI SERIAL MEMORY The memory portion of the device is a CMOS serial EEPROM array with Xicor’s block lock protection. The array is internally organized The device features a Serial Peripheral Interface (SPI) and software proto- col allowing operation on a simple four-wire bus. ...

Page 6

... This mechanism protects the block lock and watchdog bits from inadvertent corruption. In the locked state ( pin is LOW and the nonvolatile bit WPEN is “1”. This mode disables nonvolatile writes to the device’s status register. www.xicor.com Block Status Register WPEN, BL0, BL1 Unprotected Block WD0, WD1 ...

Page 7

... If the address counter reaches the end of a page and the clock continues, the counter will roll back to the first address of the page and overwrite any data that may have been previously written. www.xicor.com Data Out ...

Page 8

... CS must come HIGH at the proper clock count in order to start a nonvolatile write cycle Instruction MSB High Impedance www.xicor.com . PURST Data Out Characteristics subject to change without notice ...

Page 9

... Bit Address Data Byte Instruction 7 6 www.xicor.com Data Byte Data Byte Data Byte ...

Page 10

... Min. Typ. Max 0.1 10 0.1 10 – 0.4 0.4 0.4 V – 0 – 0 – 0.2 CC 0.4 www.xicor.com Supply Voltage 2.7V to 5.5V 4.5V-5.5V Unit Test Conditions mA SCK = V x 0.1/V x 0.9 @ 2MHz Open mA SCK = V x 0.1/V x 0.9 @ 2MHz Open µ 5.5V CC µ ...

Page 11

... CS deselect time CS (4) t Write cycle time WC REV 1.1.1 3/5/ Test A.C. TEST CONDITIONS CC Input pulse levels 5V Input rise and fall times Input and output timing level 4.6KΩ 30pF Parameter www.xicor.com Max. Unit Conditions OUT 0 10ns V x0.5 CC 2.7–5.5V Min. ...

Page 12

... CS after a valid write sequence has been sent to the end of the self-timed internal nonvolatile WC write cycle. Serial Output Timing CS SCK MSB Out ADDR SI LSB IN REV 1.1.1 3/5/ Parameter t t CYC MSB–1 Out www.xicor.com LAG t FI LSB IN 2.7–5.5V Min. Max. Unit 0 2 MHz 250 250 0 100 100 t LAG DIS LSB Out Characteristics subject to change without notice ...

Page 13

... Reset valid V RVALID CC Note: (5) This parameter is periodically sampled and not 100% tested. CS/WDI vs. RESET/RESET Timing CS/WDI RESET RESET REV 1.1.1 3/5/01 V TRIP t PURST 0 Volts t PURST t R Parameter TRIP t CST t t WDO RST www.xicor.com V TRIP RPD Min. Typ. Max. 4.5 4.63 4.75 4.25 4.38 4.5 2.85 2.93 3.0 2.55 2.63 2.7 voltage) 20 100 200 280 ...

Page 14

... THD t TSU VPH VPS VPO VPH VPS t VPO VP1 VPS VPS VPO VPH t VPO www.xicor.com Typ. Max. Unit 200 300 ms 600 800 ms 1.4 2 sec ns 200 300 Characteristics subject to change without notice. ...

Page 15

... TRIP V programming parameters are periodically sampled and are not 100% tested. TRIP REV 1.1.1 3/5/01 = 1.7–5.5V; Temperature = 0°C to 70°C CC Description applied–V CC TRIP Program Voltage accuracy [(V applied–V CC www.xicor.com Min. Max 1.7 5.0 ) (programmed at 25°C) -0.1 +0.4 )— ...

Page 16

... TRIP 0.75 0.7 0. 3.5V TRIP 0.6 0.55 0 2.5V TRIP 0. vs. Voltage/Temperature (WD1 WDO 205 200 195 190 185 180 175 170 165 160 90 www.xicor.com –40°C 25°C 90°C 1.7 2.4 3.1 3.8 4.5 Voltage –40°C 25°C 90°C 1.7 2.4 3.1 3.8 Voltage –40°C 25°C 90°C 1.7 2.4 3.1 3.8 4.5 Voltage Characteristics subject to change without notice. 5.2 4.5 5 ...

Page 17

... Plastic Dual In-Line Package Type P 0.430 (10.92) 0.360 (9.14) Pin 1 Index Pin 1 0.300 (7.62) Ref. Seating Plane 0.150 (3.81) 0.125 (3.18) 0.110 (2.79) 0.090 (2.29) 0.325 (8.25) 0.300 (7.62) Max. www.xicor.com 0.260 (6.60) 0.240 (6.10) 0.060 (1.52) 0.020 (0.51) 0.145 (3.68) 0.128 (3.25) 0.025 (0.64) 0.015 (0.38) 0.065 (1.65) 0.045 (1.14) 0.020 (0.51) 0.016 (0.41) 0° 15° Characteristics subject to change without notice. ...

Page 18

... NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.1.1 3/5/01 0.150 (3.80) 0.158 (4.00) 0.336 (8.55) 0.345 (8.75) 0.004 (0.10) 0.010 (0.25) X 45° 0.250" 0.0075 (0.19) 0.010 (0.25) FOOTPRINT www.xicor.com 0.228 (5.80) 0.244 (6.20) 0.053 (1.35) 0.069 (1.75) 0.050" Typical 0.050" Typical 0.030" Typical 14 Places Characteristics subject to change without notice ...

Page 19

... X5643S14I-4.5A 0–70°C X5643P 0–70°C X5643S14 -40–85°C X5643S14I 0–70°C X5643S14-2.7A 0–70°C X5643S14-2 8-Lead PDIP S14 = 14 Lead SOIC Blank = 5V ±10%, 0°C to +70° 5V±10%, 0°C to +70°C, V TRIP ±10%, –40°C to +85°C, V TRIP ± ...

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