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PDF CAT14008 Data sheet ( Hoja de datos )

Número de pieza CAT14008
Descripción (CAT140xx) Voltage Supervisor
Fabricantes Catalyst Semiconductor 
Logotipo Catalyst Semiconductor Logotipo



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No Preview Available ! CAT14008 Hoja de datos, Descripción, Manual

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Voltage Supervisor with I2C Serial
CMOS EEPROM
CAT140xx
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 = 1 V
„ Supports Standard and Fast I2C Protocol
„ 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)
CAT14016 / 08 / 04 / 02
NC / NC / NC / A0
NC / NC / A1 / A1
NC / A2 / A2 / A2
VSS
1
2
3
4
8 VCC
7 RST/RST
6 SCL
5 SDA
PIN FUNCTION
Pin Name
A0, A1, A2
SDA
SCL
RST/¯R¯S¯T¯
VCC
VSS
NC
Function
Device Address Inputs
Serial Data Input/Output
Serial Clock Input
Reset Output
Power Supply
Ground
No Connect
DESCRIPTION
The CAT140xx (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 both the standard
(100kHz) as well as fast (400kHz) I2C protocol.
The CAT140xx 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
14002
14004
14008
14016
Memory density
2-Kbit
4-Kbit
8-Kbit
16-Kbit
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
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1117 Rev. A

1 page




CAT14008 pdf
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CAT140xx
PIN DESCRIPTION
RESET/R¯¯E¯S¯E¯T¯ : RESET OUTPUT
This output is available in two versions: CMOS
Active Low (CAT140xx9) and CMOS Active High
(CAT140xx1). Both versions are push-pull outputs
for high efficiency.
SDA: SERIAL DATA ADDRESS
The Serial Data I/O pin receives input data and
transmits data stored in EEPROM. In transmit mode,
this pin is open drain. Data is acquired on the
positive edge, and is delivered on the negative edge
of SCL.
SCL: SERIAL CLOCK
The Serial Clock input pin accepts the Serial Clock
generated by the Master.
A0, A1, A2: Device Address Inputs
The Address inputs set the device address when
cascading multiple devices. When not driven, these
pins are pulled LOW internally.
DEVICE OPERATION
The CAT140xx products combine the accurate
voltage monitoring capabilities of a standalone
voltage supervisor with the high quality and reliability
of standard EEPROMs from Catalyst Semiconductor.
RESET CONTROLLER DESCRIPTION
The reset signal is asserted LOW for the CAT140xx9
and HIGH for the CAT140xx1 when the power
supply voltage falls below the threshold trip voltage
and remains asserted for at least 140ms (tPURST) after
the power supply voltage has risen above the threshold.
Reset output timing is shown in Figure 1.
The CAT140xx devices protect μPs against brownout
failure. Short duration VCC transients of 4μsec or less
and 100mV amplitude typically do not generate a Reset
pulse.
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
CAT140xxZ
CAT140xxM
RESET OVERDRIVE VTH - VCC [mV]
Figure 2. Maximum Transient Duration Without
Causing a Reset Pulse vs. Overdrive Voltage
VCC
VTH
VRVALID
t PURS T
t RPD
t PURS T
t RPD
RESE T
CAT140xx9
RESE T
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Figure 1. RESET Output Timing
5
CAT140xx1
Doc. No. 1117 Rev. A

5 Page





CAT14008 arduino
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Figure 10. Immediate Read Sequence and Timing
BUS ACTIVITY:
MASTER
S
T
A
R
T
S
SLAVE
SLAVE
ADDRESS
A
C
K
DATA
BYTE
N
O
S
AT
CO
KP
P
CAT140xx
SCL 8 9
SDA
8th Bit
DATA OUT
NO ACK
STOP
Figure 11. Selective Read Sequence
BUS ACTIVITY:
MASTER
S
T
A
R
T
S
SLAVE
SLAVE
ADDRESS
ADDRESS
BYTE
A
C
K
S
T
A
R
T
SLAVE
ADDRESS
S
A
C
K
A
C
K
DATA
BYTE
N
O
S
AT
CO
KP
P
Figure 12. Sequential Read Sequence
BUS ACTIVITY:
SLAVE
MASTER ADDRESS
A
C
K
AA
CC
KK
SLAVE
A
C
DATA
K BYTE
n
DATA
BYTE
n+1
DATA
BYTE
n+2
DATA
BYTE
n+x
N
O
S
AT
CO
KP
P
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 1117 Rev. A

11 Page







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