CAT15008 datasheet(6/15 Pages) CATALYST | Voltage Supervisor with 8-Kb and 16-Kb SPI Serial CMOS EEPROM

6 page

CAT15008, CAT15016

Doc. No. 1125 Rev. A

Characteristics subject to change without notice

Figure 2 shows the maximum pulse duration of

negative-going VCC transients that do not cause a reset

condition. As the amplitude of the transient goes further

below the threshold (increasing VTH - VCC), the

maximum pulse duration decreases. In this test, the

VCC starts from an initial voltage of 0.5V above the

threshold and drops below it by the amplitude of the

overdrive voltage (VTH - VCC).

EMBEDDED EEPROM DESCRIPTION

The CAT15008/16 devices support the Serial Peripheral

Interface (SPI) bus protocol, modes (0,0) and (1,1). The

device contains an 8-bit instruction register. The

instruction set and associated op-codes are listed in

Table 1.

Reading data stored in the CAT15008/16 is accom–

plished by simply providing the READ command and an

address. Writing to the CAT15008/16, in addition to a

WRITE command, address and data, also requires

enabling the device for writing by first setting certain bits

in a Status Register, as will be explained later.

After a high to low transition on the CS

¯¯ input pin, the

CAT15008/16 will accept any one of the six instruction

op-codes listed in Table 1 and will ignore all other

possible

8-bit

combinations.

The

communication

protocol follows the timing from Figure 3.

Figure 2. Maximum Transient Duration without

Causing a Reset Pulse vs. Overdrive Voltage

Table 1: Instruction Set

Instruction

Opcode

Operation

WREN

0000 0110 Enable Write Operations

WRDI

0000 0100 Disable Write Operations

RDSR

0000 0101 Read Status Register

WRSR

0000 0001 Write Status Register

READ

0000 0011 Read Data from Memory

WRITE

0000 0010 Write Data to Memory

Figure 3. Synchronous Data Timing

Note: Dashed Line = mode (1, 1) - - - - - -

VALID IN

VIH

VIL

tCSS

VIH

VIL

VIH

VIL

VOH

VOL

HI-Z

tSU

tWH

tWL

tCS

tCSH

tHO

tDIS

HI-Z

SCK

tRI

tFI

RESET OVERDRIVE VTH - VCC [mV]

TAMB = 25ºC

CAT150xxM

CAT150xxZ

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