W28V400B Datasheet, PDF(45/48 Page) Winbond – 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

W28V400B Datasheet, PDF (45/48 Pages) Winbond – 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY

◁

W28V400B/T

Recommended Operating Conditions

At Device Power-up

AC timing illustrated in Figure 18 is recommended for the supply voltages and the control signals at

device power-up. If the timing in the figure is ignored, the device may not operate correctly.

VDD(min)

VDD Vss

#RESET(p) VIH

VIL

Vpp (V) VPPH1/2

Vss

VIH

ADDRESS(A) VIL

VIH

#CE (E)

VIL

VIH

#WE (W)

VIL

VIH

#OE (G) VIL

VIH

#WP (S)

VIL

VOH

DATA (D/Q)

VOL

tVR

t2VPH*1

tPHQV

tR or tF

tAVQV

Valid Address

t ELQV

tR or tF

t GLQV

HIGH Z

Valid Output

*1 t5VPH for the device in 5V operations.

*2 To prevent the unwanted writes, system designers should consider the VPP switch, which connects VPP to VSS during read

operations and VPPH1/2/3 during write or erase operations.

Figure 18. AC Timing at Device Power-up

For the AC specifications tVR, tR, tF in the figure, refer to the next page. See the âELECTRICAL SPECIFICATIONSâ described in

specifications for the supply voltage range, the operating temperature and the AC specifications not shown in the next page.

- 45 -

Publication Release Date: April 11, 2003

Revision A4

▷