25CSM04T-ISLASHCS0668 datasheet(11/55 Pages) MICROCHIP

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DS20005817D-page 11

25CSM04

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

2.1

Chip Select (CS)

Asserting the CS pin selects the device. When the CS

pin is deasserted, the device will be deselected and

placed in Standby mode and the SO pin will be in a

high-impedance state. When the device is deselected,

data will not be accepted on the SI pin.

A high-to-low transition on the CS pin is required to

start a sequence and a low-to-high transition is

required to end a sequence. For write sequences, the

device will not enter Standby mode until the completion

of the self-timed internal write cycle.

2.2

Serial Data Output (SO)

The SO pin is used to shift data out from the device.

Data on the SO pin are always clocked out on the

falling edge of SCK. The SO pin is in a high-impedance

state whenever the device is deselected (CS is

deasserted) as well as when the Hold function is

engaged.

2.3

Write-Protect Pin (WP)

The Write-Protect (WP) pin can be used to protect the

STATUS register and memory array contents via the

Block Protection modes when Legacy Write Protection

mode is enabled.

When Enhanced Write Protection mode is enabled, the

WP pin can be used to protect any memory zone in

accordance with how its corresponding Memory

Partition registers are programmed.

2.4

Serial Data Input (SI)

Instructions, addresses and data are latched by the

25CSM04 on the rising edge of the Serial Clock (SCK)

line via the Serial Data Input (SI) pin.

2.5

Serial Clock (SCK)

The Serial Clock (SCK) pin is used to provide a clock

signal to the device and is used to synchronize the flow

of data to and from the device. Instructions, addresses

and data present on SI pin are always latched in on the

rising edge of SCK, while output data on the SO pin are

always clocked out on the falling edge of SCK.

2.6

Hold (HOLD)

When

the

device

selected

and

serial

communication sequence is underway, HOLD can be

used to pause the communication with the host device

without resetting the serial sequence.

TABLE 2-1:

PIN FUNCTION TABLE

Name

8-Lead SOIC

8-Pad TDFN-S(1)

8-Ball CSP

Function

Chip Select Input

Serial Data Output

Write-Protect

VSS

Ground

Serial Data Input

SCK

Serial Clock Input

HOLD

Hold Input

VCC

Device Power Supply

Note 1: The exposed pad on the TDFN-S package can be connected to VSS or left floating.

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