X25043 Intersil Corporation, X25043 Datasheet

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X25043

Manufacturer Part Number
X25043
Description
Manufacturer
Intersil Corporation
Datasheet

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X25043
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XICOR
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X25043
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X25043P
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X25043P-2.7
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INTERSIL
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X25043S
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SG
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X25043S8
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XILINX
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X25043S8-2.7
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X25043ST1
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XICOR
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X25043/45
4K
FEATURES
DIE PHOTOGRAPH
Direct Write™ is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
3844-6.5 5/9/96 T4/C2/D2 NS
Programmable Watchdog Timer
Low V
Reset Signal Valid to V
1MHz Clock Rate
512 X 8 Bits Serial E
—4 Byte Page Mode
Low Power CMOS
—50 A Standby Current
—3mA Active Current
2.7V To 5.5V Power Supply
Block Lock
—Protect 1/4, 1/2 or all of E
Built-in Inadvertent Write Protection
—Power-Up/Power-Down protection circuitry
—Write Latch
—Write Protect Pin
High Reliability
—Endurance: 100,000 cycles per byte
—Data Retention: 100 Years
—ESD protection: 2000V on all pins
Available Packages
—8-Lead PDlP
—8-Lead SOIC
—14-Lead TSSOP
X25043 = Active LOW RESET
X25045 = Active HIGH RESET
CC
A V A I L A B L E
Detection
A
PPLICATION
TM
AN11 • AN21
Programmable Watchdog Supervisory E
N
2
INTERFACE
INTERFACE
OTES
PROM
CC
SERIAL
SERIAL
LOGIC
LOGIC
CONTROL
CONTROL
= 1V
2
RESET
RESET
LOGIC
LOGIC
PROM Array
HIGH VOLTAGE GENERATOR
HIGH VOLTAGE GENERATOR
X25043/45
PROGRAMMABLE
PROGRAMMABLE
4K BITS E
4K BITS E
VOLTAGE
VOLTAGE
SENSOR
SENSOR
1
CONTROL
CONTROL
DESCRIPTION
The X25043/45 combines three popular functions,
Watchdog Timer, Voltage Supervision, and E
a single package. This combination lowers the system
cost and reduces the board space requirements.
The Watchdog Timer provides an independent protec-
tion system for microcontrollers. During a system failure,
the X25043/45 watchdog 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 cy-
cling the power.
The system is protected from low voltage conditions by
the X25043/45 low V
drops below the minimum V
reset. Reset is asserted until V
The memory portion of the X25043/45 is a CMOS 4096-
bit serial E
X25043/45 features a Serial Peripheral Interface (SPI)
and software protocol allowing operation on a simple
three-wire bus.
The X25043/45 utilizes Xicor’s proprietary Direct Write™
cell, providing a minimum endurance of 100,000 cycles
per byte and a minimum data retention of 100 years.
AND
AND
2
2
PROM
PROM
2
PROM, internally organized as 512 X 8. The
CC
2
PROM
detection circuits. When V
Characteristics subject to change without notice
CC
CC
trip point, the system is
returns and stabilizes.
512 x 8 Bit
2
PROM in
3844 ILL F01
CC

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X25043 Summary of contents

Page 1

... The system is protected from low voltage conditions by the X25043/45 low V drops below the minimum V reset. Reset is asserted until V The memory portion of the X25043/ CMOS 4096- 2 bit serial E PROM, internally organized as 512 X 8. The X25043/45 features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple three-wire bus ...

Page 2

... When WP is held HIGH, all functions, including nonvola- tile writes operate normally. WP going LOW while CS is still LOW will interrupt a write to the X25043/45. If the internal write cycle has already been initiated, WP going LOW will have no affect on a write. ...

Page 3

... When issuing, WREN, WRDI and RDSR commands not necessary to send a byte address or data. The Write-In-Process (WIP) bit indicates whether the X25043/45 is busy with a write operation. When set to a PROM designed to “1”, a write is in progress, when set to a “0”, no write is in progress. During a write, all other bits are set to “ ...

Page 4

... SO line as shown in Figure 2. Write Sequence Prior to any attempt to write data into the X25043/45 the “write enable” latch must first be set by issuing the WREN instruction (See Figure 3 first taken LOW, then the WREN instruction is clocked into the X25043/45 ...

Page 5

... CC point and/or the watchdog timer has reached its pro- grammable time-out limit. Operational Notes The X25043/45 powers-up in the following state: • The device is in the low power standby state. • A HIGH to LOW transition required to enter an active state and receive an instruction. • SO pin is high impedance. ...

Page 6

... X25043/45 Figure 3. Write Enable Latch Sequence CS SCK SI HIGH IMPEDANCE SO Figure 4. Byte Write Operation Sequence SCK INSTRUCTION SI 8 9TH BIT OF ADDRESS HIGH IMPEDANCE BYTE ADDRESS SYMBOL TABLE WAVEFORM 6 3844 FHD F05 DATA BYTE 3844 FHD F06 INPUTS OUTPUTS Must be Will be steady steady ...

Page 7

... X25043/45 Figure 5. Page Write Operation Sequence SCK INSTRUCTION SCK DATA BYTE Figure 6. Write Status Register Operation Sequence CS 0 SCK SI HIGH IMPEDANCE BYTE ADDRESS 9TH BIT OF ADDRESS DATA BYTE INSTRUCTION DATA BYTE DATA BYTE DATA BYTE 3844 FHD F07 3844 ILL F08 ...

Page 8

... Supply Voltage Max +85 C 3844 PGM T06.1 Limits Min. Max. Units – –0 –0 0 5V. CC Test 8 Limits X25043/45 5V 10% X25043/45-2.7 2.7 to 5.5V Test Conditions SCK = V x 0.1/V x 0.9 @ 1MHz Open OUT 2mA ...

Page 9

... X25043/45 EQUIVALENT A.C. LOAD CIRCUIT AT 5V VCC 5V OUTPUT RESET/RESET 100pF A.C. CHARACTERISTICS (Over recommended operating conditions, unless otherwise specified) Data Input Timing Symbol Parameter f Clock Frequency SCK t Cycle Time CYC CS Lead Time t LEAD CS Lag Time t LAG t Clock HIGH Time WH t Clock LOW Time ...

Page 10

... X25043/45 Serial Output Timing CS SCK MSB OUT ADDR SI LSB IN Serial Input Timing CS t LEAD SCK MSB IN HIGH IMPEDANCE CYC MSB–1 OUT LAG DIS LSB OUT 3844 FHD F09 LAG t FI LSB IN 3844 FHD F10 ...

Page 11

... X25043/45 Power-Up and Power-Down Timing V TRIP VCC t PURST 0 Volts t PURST t R RESET (X25043) RESET (X25045) RESET Output Timing Symbol Parameter V Reset Trip Point Voltage, 5V Device TRIP Reset Trip Point Voltage, 2.7V Device t Power-up Reset Timeout PURST t V Detect to Reset/Output (5) RPD Fall Time ...

Page 12

... X25043/45 PACKAGING INFORMATION HALF SHOULDER WIDTH ON ALL END PINS OPTIONAL 0.015 (0.38) TYP. 0.010 (0.25) NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH 8-LEAD 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. ...

Page 13

... X25043/45 PACKAGING INFORMATION 8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S PIN 1 INDEX 0.010 (0.25) 0.020 (0.50) 0 – 8 0.016 (0.410) 0.037 (0.937) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 0.150 (3.80) 0.158 (4.00) PIN 1 0.014 (0.35) 0.019 (0.49) 0.188 (4.78) 0.197 (5.00) (4X ...

Page 14

... X25043/45 PACKAGING INFORMATION 14-LEAD PLASTIC, TSSOP PACKAGE TYPE V 0 – 8 See Detail “A” NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) .025 (.65) BSC .169 (4.3) .252 (6.4) BSC .177 (4.5) .193 (4.9) .200 (5.1) .047 (1.20) .0075 (.19) .002 (.05) .0118 (.30) .006 (.15) .010 (.25) ...

Page 15

... X25043/ Blank = 5V 10% 2.7 = 2.7V to 5.5V Temperature Range Blank = Commercial = + Industrial = – +85 C Package P = 8-Lead Plastic DIP S = 8-Lead SOIC V = 14-Lead TSSOP Blank = 8-Lead SOIC X25043/ 8-Lead Plastic DIP V = 14-Lead TSSOP X Blank = 10%, – + 2.7V to 5.5V + 2.7V to 5.5V, – + Limits ...

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