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5V7855SWFR датащи(PDF) 8 Page - Integrated Device Technology

номер детали 5V7855SWFR
подробное описание детали  EEPROM Programmable PLL Die for LVCMOS Crystal Oscillator
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производитель  IDT [Integrated Device Technology]
домашняя страница  http://www.idt.com
Logo IDT - Integrated Device Technology

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IDT5V7855-DPK REVISION A MARCH 11, 2010
8
©2010 Integrated Device Technology, Inc.
IDT5V7855 Data Sheet
EEPROM PROGRAMMABLE PLL DIE FOR LVCMOS CRYSTAL OSCILLATOR
The procedure to program the registers and control bits and write the data to the EEPROM is as follows:
1.
Set CONT and OUT to 0.0 volts with no power applied.
2.
Apply power, wait for 1ms.
3.
Apply four clock pulses to OUT to enter serial programming mode (see timing diagram below).
4.
Wait 1ms.
5.
Apply EEPROM programming pulse (12V) on CONT to erase EEPROM.
[WARNING: Do not apply High Voltage Programming pulse prior to entering serial mode.]
6.
Wait 1ms.
7.
Enter serial data (bit order as described above) via the CONT pin, with a positive pulse on OUT pin for each data bit.
NOTE: CONT must only change while OUT is LOW to write the data properly.
8.
Complete the serial write with a Stop Bit set to 0.
9.
Wait 1ms
10.
While OUT is held LOW, apply EEPROM programming pulse (12V) to CONT to store the data in EEPROM.
11.
Remove power from the device.
Figure 3. Timing Diagram
3G. Timing/Voltage Requirements Table
NOTE: The supply voltage on VDD must be able to sink at least 2mA when VPP is applied to CONT to ensure transient currents are safely
absorbed. Alternatively, a 1k
resistor may be connected between V
DD and GND during programming.
Symbol
Parameter
Test Conditions
Minimum
Maximum
Units
ts
Enter Serial Data Mode
1
ms
td
Data & Clock Timing
1
µs
tp
Programming EEPROM Timing
100
110
ms
tR / tF
Rise/Fall Time of VPP
10% - 90%
5
ms
VDD
Supply Voltage; NOTE
2.2
3.6
V
VPP
Programming EEPROM Voltage
11.5
12.5
V


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