X46402V8-3.1 XICOR [Xicor Inc.], X46402V8-3.1 Datasheet
X46402V8-3.1
Related parts for X46402V8-3.1
X46402V8-3.1 Summary of contents
Page 1
Preliminary Information 64K Dual Voltage CPU Supervisor with 64K Password Protected EEPROM FEATURES • Dual Voltage Detection and Reset Assertion —Low Vcc Monitor —Low V2MON Monitor —Low Vcc Block of EEPROM Writes —RESET Signal Valid down to Vcc=1V • Selectable ...
Page 2
X46402 PACKAGE/PINOUTS 8L TSSOP SDA RESET PIN NAMES VSS Ground SDA Serial Data VCC Power SCL Serial Clock WP Write Protect V2MON Voltage monitor input RESET Low Voltage Detect ...
Page 3
X46402 Volt Reg OTP Mode Enabled Pin1 Vss V2MON WP SDA V2FAIL RESET Recommended Connection ARCHITECTURE Data Memory This 64kbit memory array can be partitioned into pass- word protected or non-password protected areas. When password protected, the contents are readable ...
Page 4
X46402 Password Protection Configuration Portions of the memory array may be “locked”. This area of memory is password protected and is defined by the bits BL2, BL1 and BL0. For these protected areas it is necessary to use a Read ...
Page 5
X46402 Figure 2. Set V Level Sequence (V TRIP TRIP RESET SCL SDA D8h Figure 3. Set V2 Level Sequence (V TRIP V2 TRIP V2MON RESET ...
Page 6
X46402 Figure 5. Reset V2 Level Sequence (Vcc > 3V, WEL is set.) TRIP V2 TRIP V2MON RESET SCL SDA D8h V AND V2MON THRESHOLD RESET PROCEDURE CC The X46402 is shipped ...
Page 7
X46402 New Vcc or V2MON applied = Old Vcc V2MON applied V /V2 Programming TRIP TRIP Execute Reset V /V2 TRIP TRIP Sequence Set Vcc = Vcc applied = Desired V OR TRIP Set V2MON = V2MON applied = Desired ...
Page 8
X46402 Figure 7. X46402 Device Operation (Non-Password Protected Areas) LOAD COMMAND BYTE LOAD 2 BYTE ADDRESS READ/WRITE DATA BYTES Twc OR DATA ACK POLLING Tamper Counter The X46402 contains a tamper counter. The entry of an invalid password increments the ...
Page 9
X46402 Figure 9. Definition of Start and Stop Conditions Acknowledge SCL SDA Start Condition Acknowledge is a software convention used to indicate successful data transfer. The transmitting device, either master or slave, will release the bus after transmitting eight bits. ...
Page 10
X46402 PROGRAM OPERATIONS Password Protected Array Programming The password protected memory array write or OTP write requires issuing an 8-bit Password Write command followed by the password, password ACK command, the address and then the data bytes transferred as illustrated ...
Page 11
X46402 ACK Polling Once a stop condition is issued to indicate the end of the host’s write sequence, the X46402 initiates the internal nonvolatile write cycle. In order to take advantage of the typical 5ms write cycle, ACK polling can ...
Page 12
X46402 Figure 12. Acknowledge Polling SCL 8th clk. of 8th pwd. byte SDA PASSWORD PROTECTED READ OPERATIONS Password protected read operations are initiated in the same manner as password protected write operations but with a different command code. Password Random ...
Page 13
X46402 No-Password Sequential Read The host can read sequentially within the un-protected area of the array after receiving the No-password Com- mand and an address within the unprotected address space. The data output is sequential, with the data from address ...
Page 14
X46402 Figure 15. Non-Password Protected Random Read No-Password COMMAND SDA S Figure 16. Non-Password Protected Sequential Read No-Password COMMAND SDA S Figure 17. Change Passwords COMMAND SDA S If ACK, then Password Matches ACK POLLING COMMAND S New Password 0 ...
Page 15
X46402 Note on Read/Write Operations 1FFFh 0000h Notes: Using a “password read” “password write” non-password protected area is acceptable, because the pass- word is received and accepted prior to an address transmission assumed that ...
Page 16
X46402 An easier way to determine that the password has been changed correctly is to read the ACK bit following the second writing of the new password. If the device returns an ACK, the password is good ACK ...
Page 17
X46402 Table 4. CAPACITANCE (T = +25° 1MHz Symbol (3) Output Capacitance (SDA) C OUT (3) Input Capacitance (WP, SCL Notes: (1) Must perform a stop command after a read command prior to ...
Page 18
X46402 RESET AC SPECIFICATIONS Nonvolatile Write Cycle Timing Symbol (1) Write Cycle Time t WC Notes the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal ...
Page 19
X46402 GUIDELINES FOR CALCULATING TYPICAL VALUES OF BUS PULL UP RESISTORS PMAX MIN Bus capacitance in pF POWER-UP AND POWER-DOWN TIMING RESET Output Timing V TRIP VCC 0 Volts t ...
Page 20
X46402 Symbol V RESET Trip Point Voltage TRIP V V2FAIL Trip Point Voltage 2TRIP V Hysteresis TRIP V TH (HIGH to LOW vs. LOW to HIGH V V Hysteresis 2TRIP V 2TA (HIGH to LOW vs. LOW to HIGH V ...
Page 21
X46402 RESET Output Timing Symbol Watchdog Timeout Period, WD2 = 0, WD1 = 1, WD0 = 0 WD2 = 0, WD1 = 0, WD0 = 1 WD2 = 0, WD1 = 0, WD0 = 0 t WDO WD2 = 1, ...
Page 22
X46402 0 – 8 See Detail “A” NOTE: ALL DIMENSIONS IN INCHES (IN P ARENTHESES IN MILLIMETERS) 8-LEAD PLASTIC, TSSOP , PACKAGE TYPE V .025 (.65) BSC .169 (4.3) .252 (6.4) BSC .177 (4.5) .114 (2.9) .122 (3.1) .047 (1.20) ...
Page 23
... C 1.7 -20 to 85°C 2 70° C 2.3 -20 to 85°C 23 Preliminary Information Part Number 0°C–70°C X46402V8-3.1 -20°C–85°C X46402V8E-3.1 0°C–70°C X46402V8-3.1A -20°C–85°C X46402V8E-3.1A 0°C–70°C X46402V8-2.9 -20°C–85°C X46402V8E-2.9 ...