W25X16A Datasheet, PDF (9/48 Pages) Winbond – 16M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI

W25X16A
9.1 Package Types
At the time this datasheet was published not all package types had been finalized. Contact Winbond
to confirm availability of these packages before designing to this specification. W25X16A is offered in
an 8-pin plastic 150-mil width SOIC (package code SN), 208-mil width SOIC (package code SS), 6x5-
mm WSON (package code ZP), 16-pin plastic 300-mil width SOIC (package code SF) and 300-mil
DIP (package code DA). See figures 1a-e. Package diagrams and dimensions are illustrated at the
end of this datasheet.
9.2 Chip Select (/CS)
The SPI Chip Select (/CS) pin enables and disables the device operation. When /CS is high the device
is deselected and the Serial Data Output (DO) pin is at high impedance. When deselected, the
device’s power consumption will be at standby levels unless an internal erase, program or status
register cycle is in progress. When /CS is brought low the device will be selected, power consumption
will increase to active levels and instructions can be written to and data read from the device. After
power-up, /CS must transition from high to low before a new instruction will be accepted. The /CS
input must track the VCC supply level at power-up (see “Write Protection” and figure 20). If needed a
pull-up resister on /CS can be used to accomplish this.
9.3 Serial Data Output (DO)
The SPI Serial Data Output (DO) pin provides a means for data and status to be serially read from
(shifted out of) the device. Data is shifted out on the falling edge of the Serial Clock (CLK) input pin.
9.4 Write Protect (/WP)
The Write Protect (/WP) pin can be used to prevent the Status Register from being written. Used in
conjunction with the Status Register’s Block Protect (BP2, BP1, and BP0) bits and Status Register
Protect (SRP) bits, a portion or the entire memory array can be hardware protected. The /WP pin is
active low.
9.5 HOLD (/HOLD)
The /HOLD pin allows the device to be paused while it is actively selected. When /HOLD is brought
low, while /CS is low, the DO pin will be at high impedance and signals on the DIO and CLK pins will
be ignored (don’t care). When /HOLD is brought high, device operation can resume. The /HOLD
function can be useful when multiple devices are sharing the same SPI signals. (“See Hold function”)
9.6 Serial Clock (CLK)
The SPI Serial Clock Input (CLK) pin provides the timing for serial input and output operations. ("See
SPI Operations")
9.7 Serial Data Input / Output (DIO)
The SPI Serial Data Input/Output (DIO) pin provides a means for instructions, addresses and data to
be serially written to (shifted into) the device. Data is latched on the rising edge of the Serial Clock
(CLK) input pin. The DIO pin is also used as an output pin when the Fast Read Dual Output instruction
is executed.
Publication Release Date: August 7, 2009
-9-
Revision B