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CAT15002 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT15002
Beschreibung (CAT15002 / CAT15004) Voltage Supervisor
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 15 Seiten
CAT15002 Datasheet, Funktion
www.DataSheet4U.com
CAT15002, CAT15004
Voltage Supervisor with 2-Kb and 4-Kb SPI
Serial CMOS EEPROM
FEATURES
„ Precision Power Supply Voltage Monitor
ƒ 5V, 3.3V, 3V & 2.5V systems
ƒ 7 threshold voltage options
„ Active High or Low Reset
ƒ Valid reset guaranteed at VCC = 1V
„ 10MHz SPI compatible
„ 16-byte page write buffer
„ Low power CMOS technology
„ 1,000,000 Program/Erase cycles
„ 100 year data retention
„ Industrial temperature range
„ RoHS-compliant 8-pin SOIC package
For Ordering Information details, see page 14.
PIN CONFIGURATION
SOIC (W)
C¯¯S 1
SO 2
¯W¯P¯ 3
8 VCC
7 RST/¯R¯S¯T¯
6 SCK
VSS 4
5 SI
DESCRIPTION
The CAT15002/04 (see table below) are memory and
supervisory solutions for microcontroller based
systems. A CMOS serial EEPROM memory and a
system power supervisor with brown-out protection
are integrated together. Memory interface is via SPI
bus serial interface.
The CAT15002/04 provides a precision VCC sense
circuit with two reset output options: CMOS active low
output or CMOS active high. The RESET output is
active whenever VCC is below the reset threshold or
falls below the reset threshold voltage.
The power supply monitor and reset circuit protect
system controllers during power up/down and against
brownout conditions. Seven reset threshold voltages
support 5V, 3.3V, 3V and 2.5V systems. If power
supply voltages are out of tolerance reset signals
become active, preventing the system microcontroller,
ASIC or peripherals from operating. Reset signals
become inactive typically 240ms after the supply
voltage exceeds the reset threshold level.
MEMORY SIZE SELECTOR
Product
15002
15004
Memory density
2-Kbit
4-Kbit
PIN FUNCTION
Pin Name
C¯¯S
SO
¯W¯P¯
VSS
SI
SCK
RST/¯R¯S¯T¯
VCC
Function
Chip Select
Serial Data Output
Write Protect
Ground
Serial Data Input
Serial Clock Input
Reset Output
Power Supply
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
THRESHOLD SUFFIX SELECTOR
Nominal Threshold
Voltage
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
2.32V
Threshold Suffix
Designation
L
M
J
T
S
R
Z
1 Doc. No. 1126 Rev. A






CAT15002 Datasheet, Funktion
www.DataSheet4U.com
CAT15002, CAT15004
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).
TAMB = 25ºC
CAT150xxZ
CAT150xxM
RESET OVERDRIVE VTH - VCC [mV]
Figure 2. Maximum Transient Duration without
Causing a Reset Pulse vs. Overdrive Voltage
EMBEDDED EEPROM DESCRIPTION
The CAT15002/04 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 CAT15002/04 is accom–
plished by simply providing the READ command and an
address. Writing to the CAT15002/04, 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 C¯¯S input pin, the
CAT15002/04 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.
Table 1: Instruction Set
Instruction Opcode Operation
WREN
0000 0110
WRDI
0000 0100
RDSR
0000 0101
WRSR
0000 0001
READ
0000 x011
WRITE
0000 x010
Note:
x = 0 for CAT15002,
x = A8 for CAT15004
Enable Write Operations
Disable Write Operations
Read Status Register
Write Status Register
Read Data from Memory
Write Data to Memory
Figure 3. Synchronous Data Timing
VIH
CS
VIL
SCK
SI
VIH
VIL
VIH
VIL
tCSS
tWH
tSU tH
VALID IN
VOH
SO
VOL
HI-Z
Note: Dashed Line = mode (1, 1) - - - - - -
tCS
tCSH
tWL
tRI
tFI
tV
tHO
tDIS
HI-Z
Doc. No. 1126 Rev. A
6 © 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

6 Page









CAT15002 pdf, datenblatt
www.DataSheet4U.com
CAT15002, CAT15004
PACKAGE OUTLINES
8-LEAD 150 MIL SOIC (W)
E1
E
D
A
e
b
A1
h x 45
q1
L
C
SYMBOL
A1
A
b
C
D
E
E1
e
h
L
q1
MIN
0.10
1.35
0.33
0.19
4.80
5.80
3.80
0.25
0.40
NOM
1.27 BSC
MAX
0.25
1.75
0.51
0.25
5.00
6.20
4.00
0.50
1.27
2HFor current Tape and Reel information, download the PDF file
from:
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC specification MS-012 dimensions.
Doc. No. 1126 Rev. A
12 © 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

12 Page





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