TH50VSF3583AASB Datasheet, PDF (21/50 Pages) Toshiba Semiconductor – TOSHIBA MULTI-CHIP INTEGRATED CIRCUIT SILICON GATE CMOS

Command Write
TH50VSF3582/3583AASB
The TH50VSF3582/3583AASB utilizes the JEDEC command control standard for a single power supply
E²PROM. A Command is executed by inputting an address and data into the Command register. The Command
is written by inputting a pulse to WE with CEF = VIL and OE = VIH ( WE control). The command can also
be written by inputting a pulse to CEF with WE = VIL ( CEF control). The address is latched on the falling
edge of either WE or CEF . The data is latched on the rising edge of either WE or CEF . DQ0 to DQ7 are
valid for data input and DQ8 to DQ15 are ignored.
To cancel input of the command sequence mid-way, use the Reset command. The device resets the Command
register and enters Read mode. When an undefined command is input, the Command register is reset and the
device enters Read mode.
Software Reset
Apply a software reset by inputting a Read/Reset command. Software reset returns the device from ID Read
or CFI mode to Read mode, releases the lock state when automatic operation ends abnormally, or clears the
Command register.
Hardware Reset
A hardware reset initializes the device and sets it to Read mode. When a pulse is input to RESET for tRP,
the device ends the operation in progress and enters Read mode after tREADY. Note that if a hardware reset is
applied during data overwrite such as a Write or Erase operation, data at that address or block become
undefined.
After a hardware reset the device enters Read mode when RESET = VIH and Standby mode when RESET
= VIL. The DQ pins are High-Impedance when RESET = VIL. The Read operation sequence and input of any
command are allowed after the device enters Read mode.
Comparison with Software Reset and Hardware Reset
ACTION
Release ID Read or CFI mode
Clear the Command resister
Release the lock state when automatic operation ends abnormally
Stop automatic operation in progress
All stops of operation other than the above, and return to Read mode
SOFTWARE RESET
Valid
Valid
Valid
Invalid
Invalid
HARDWARE RESET
Valid
Valid
Valid
Valid
Valid
BYTE/WORD Mode
CIOF is used select Word mode (16 bits) or Byte mode (8 bits) for the TH50VSF3582/3583AASB. When VIH is
input to CIOF, the device operates in Word mode. Read data or write commands using DQ0 to DQ15. When VIL
is input to CIOF, read data or write commands using DQ0 to DQ7. A12F is used as the lowest address. DQ8 to
DQ14 become high-impedance.
2001-06-08 21/50