M39208 datasheet(15/30 Pages) STMICROELECTRONICS

15 / 30 page

Flash Sector Unprotection. Flash sectors can be

unprotected to allow updating of their contents.

Note that the Sector Unprotection unprotects all

sectors (sector 0 up to sector 7).

Flash Sector Unprotection is activated with a spe-

cific sequence of levels applied on EF, EE, G, A0,

A1, A6, A9, A12 and A15; this sequence includes a

verification of the Protection status on DQ0-DQ7

as shown in Figure 9 and Table 9.

This allows a guarantee of the retention of the

Protection status.

Remarks:

– The Verify operation is a read with a simulated

worst case conditions. This allows a guarantee

of the retention of the Protection status

– During the application life, the Sector protection

status can be accessed with a regular Read

instruction without "high voltage" VID on A9. This

instruction is detailed in Table 4.

Reset Instruction. The Reset instruction resets

the device internal logic in a few

µs. Reset is an

instruction of either one write operation or three

write operations (refer to Table 4).

Supply Rails. Normal precautions must be taken

for supply voltage decoupling, each device in a

system should have the VCC rail decoupled with a

0.1

µF capacitor close to the VCC and VSS pins. The

printed circuit board trace width should be sufficient

to carry the VCC program and erase currents re-

quired.

AI01950

1.5V

2.4V

0.45V

Figure 10. AC Testing Input Output Waveform

AI02596B

VCC

CL = 30pF

CL includes JIG capacitance

VOUT = 1.5V when the DEVICE

UNDER TEST is in the

Hi-Z output state.

DEVICE

UNDER

TEST

IOL

IOH

Figure 11. Output AC Testing Load Circuit

Symbol

Parameter

Test Condition

Min

Max

Unit

CIN

Input Capacitance

VIN = 0V

COUT

Output Capacitance

VOUT = 0V

Note: 1. Sampled only, not 100% tested.

Table 11. Capacitance (1) (TA = 25

°C, f = 1 MHz )

Input Rise and Fall Times

≤ 10ns

Input Pulse Voltages

0.45V to 2.4V

Input Timing Ref. Voltages

0.8V and 2V

Output Timing Ref. Voltages

1.5V

Table 10. AC Measurement Conditions

15/30

M39208

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