IS25C16 查看數據表（PDF） - Integrated Silicon Solution

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IS25C16

8K-BIT/16K-BIT SPI SERIAL ELECTRICALLY ERASABLE PROM

Integrated Silicon Solution 

IS25C08

IS25C16

PIN CONFIGURATION

8-Pin DIP, SOIC, and TSSOP

CS 1

SO 2

WP 3

GND 4

8 VCC

7 HOLD

6 SCK

5 SI

ISSI ®

PIN DESCRIPTIONS

CS

SCK

SI

SO

GND

VCC

WP

HOLD

Chip Select

Serial Data Clock

Serial Data Input

Serial Data Output

Ground

Power

Write Protect

Suspends Serial Input

PIN DESCRIPTIONS

Serial Clock (SCK): This timing signal provides syn-

chronization between the microcontroller and IS25C08/

16. Op-Codes, byte addresses, and data are latched on

SI with a rising edge of the SCK. Data on SO is re-

freshed on the falling edge of SCK for SPI modes (0,0)

and (1,1).

Serial Data Input (SI): This is the input pin for all data

that the IS25C08/16 is required to receive.

Serial Data Output (SO): This is the output pin for all

data transmitted from the IS25C08/16.

Chip Select (CS): The CS pin activates the device.

Upon power-up, CS should follow Vcc. When the device

is to be enabled for instruction input, the signal requires

a High-to-Low transition. While CS is stable Low, the

master and slave will communicate via SCK, SI, and SO

signals. Upon completion of communication, CS must

be driven High. At this moment, the slave device may

start its internal write cycle. When CS is high, the

device enters a power-saving standby mode, unless an

internal write operation is underway. During this mode,

the SO pin becomes high impedance.

Write Protect (WP): The purpose of this input signal is

to initiate Hardware Write Protection mode. This mode

prevents the Block Protection bits and the WPEN bit in

the Status Register from being altered. To cause

Hardware Write Protection, WP must be Low at the same

time WPEN is 1. WP may be hardwired to Vcc or GND.

HOLD (HOLD): This input signal is used to suspend the

device in the middle of a serial sequence and temporarily

ignore further communication on the bus (SI, SO, SCK).

Together with Chip Select, the HOLD signal allows

multiple slaves to share the bus. The HOLD signal

transitions must occur only when SCK is Low, and be

held stable during SCK transitions. (See Figure 8 for

Hold timing) To disable this feature, HOLD may be

hardwired to Vcc.

2

Integrated Silicon Solution, Inc. — 1-800-379-4774

Preliminary Information Rev. 00H

02/23/06

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