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SMS2916PIBT

厂商名称：ETC

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SUMMIT
MICROELECTRONICS, Inc.
Preliminary
SMS2916
3 and 5 Volt Systems
Precision Voltage Supervisory Circuit
With Watchdog Timer and 16K I
2
C Memory
FEATURES
• Precision Voltage Monitor
– Automatic V
CC
Supply Monitor
- Complementary reset outputs for complex
microcontroller systems
- Integrated memory write lockout function
- No external components required
• Watchdog Timer
– Nominal 1.6 second Timeout
• Memory Internally Organized 2K X 8
– Two Wire Serial Interface (I
2
C™)
• High Reliability
– Endurance: 1,000,000 erase/write cycles
– Data retention: 100 years
• 8-Pin PDIP or SOIC Packages
OVERVIEW
The SMS2916 is a power supervisory circuit that monitors
V
CC
(either in a 5V system or 3V system) and will generate
complementary reset outputs. The reset pins also act as
I/Os and may be used for signal conditioning. The
SMS2916 also has an on-board watchdog timer that has
a nominal time out period of 1.6 seconds.
The SMS2916 integrates a 16K-bit nonvolatile serial
memory. It features the industry standard I
2
C serial
interface allowing quick implementation in an end-users’
system.
BLOCK DIAGRAM
V
CC 8
2
RESET
5KHz
Oscillator
RESET
PULSE
GENERATOR
V
CC
+
-
GND 4
1.26V
V
TRIP
RESET
CONTROL
7
RESET
WATCHDOG
TIMER
SCL
SDA
6
5
EEPROM
MEMORY
ARRAY
WDI
1
2028 ILL2.1
SUMMIT MICROELECTRONICS, Inc.
•
300 Orchard City Drive, Suite 131
•
Campbell, CA 95008
•
Telephone 408-378-6461
•
Fax 408-378-6586
•
www.summitmicro.com
© SUMMIT MICROELECTRONICS, Inc. 1998
2028-02 4/24/98
Characteristics subject to change without notice
1
SMS2916
Preliminary
PIN CONFIGURATIONS
PIN NAMES
Symbol
WDI
WDI
RESET
NC
GND
1
2
3
4
8
7
6
5
VCC
RESET
SCL
SDA
2028 ILL1.2
Pin
1
Description
Watchdog Input /a high to
low transition will clear the
watchdog timer
Active Low RESET Input/Output
No Connect, tie to ground
or leave open
Analog and Digital Ground
Serial Memory Input/
Output data line
Serial Memory clock input
Active High RESET Input/
Output
Supply Voltage
2028 PGM T1.1
RESET
NC
GND
SDA
SCL
RESET
V
CC
2
3
4
5
6
7
8
VCC = 3.0 0r 5.0
PB_RST
ALE
SMS2916
WDI
Vcc
8051 Type MCU
RST
SCL (P0.0)
SDA (P0.1
RESET RESET
NC
GND
SCL
SDA
I
2
C
Peripheral
RESET
SCL
SDA
2028 ILL3.1
FIGURE 1. TYPICAL APPLICATION USING DUAL RESET FUNCTION AND WATCHDOG TIMER
2028-02 4/24/98
2
SMS2916
Preliminary
+5VDC
RST
SMS 2916
WDI
Vcc
RESET
RESET
Z80
I/O
I/O
NC
SCL
GND SDA
FIGURE 2. TYPICAL APPLICATION CONFIGURATION USING SYSTEM DECODE LOGIC TO RESET WDI
CAPACITANCE
T
A
= 25°C, f = 100KHz
Symbol
C
IN
L
OUT
Parameter
Input Capacitance
Output Capacitance
Max
5
8
Units
pF
pF
2028 PGM T2..0
t
R
t
F
t
H IGH
t
LOW
t
SU:STO
SCL
t
SU:SDA
t
HD:SDA
t
HD:DAT
t
SU:DAT
t
BUF
SDA In
t
DH
t
AA
SDA Out
2028 ILL5.0
FIGURE 3. BUS TIMING
Decoder
2028 ILL4.1
2028-02 4/24/98
3
SMS2916
Preliminary
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias
............................................................................................................................... -40°C to +85°C
Storage Temperature
..................................................................................................................................... -65°C to +125°C
Soldering Temperature (less than 10 seconds) ................................................................................................................... 300°C
Supply Voltage ............................................................................................................................................................. 0 to 6.5V
Voltage on Any Pin ....................................................................................................................................... -0.3V to V
CC
+0.3V
ESD Voltage (JEDEC method) .......................................................................................................................................... 2,000V
NOTE: These are STRESS ratings only. Appropriate conditions for operating these devices are given elsewhere in this specification. Stresses
beyond those listed here may permanently damage the part. Prolonged exposure to maximum ratings may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Temperature
Commercial
Industrial
Min
0°C
-40°C
Max
+70°C
+85°C
2028 PGM T3.0
DC ELECTRICAL CHARACTERISTICS
(over recommended operating conditions unless otherwise specified)
Symbol
I
CC
I
SB
I
LI
I
LO
V
IL
V
IH
V
OL
Parameter
Supply Current (CMOS)
Standby Current (CMOS)
Input Leakage
Output Leakage
Input Low Voltage
Input High Voltage
Output Low Voltage
Conditions
SCL = CMOS Levels @ 100KHz
SDA = Open
All other inputs = GND or V
CC
SCL = SDA = V
CC
All other inputs = GND
V
IN
= 0 To V
CC
V
OUT
= 0 To V
CC
S0, S1, S2, SCL, SDA,
RESET
S0, S1, S2, SCL, SDA, RESET
I
OL
= 3mA SDA
0.7xV
CC
0.4
V
CC
=5.5V
V
CC
=3.3V
V
CC
=5.5V
V
CC
=3.3V
Min
Max
3
2
50
25
10
10
0.3xV
CC
Units
mA
mA
µA
µA
µA
µA
V
V
V
2028 PGM T4.0
AC ELECTRICAL CHARACTERISTICS
(over recommended operating conditions unless otherwise specified)
Symbol
Parameter
SCL Clock Frequency
Clock Low Period
Clock High Period
Bus Free Time
Start Condition Setup Time
Start Condition Hold Time
Stop Condition Setup Time
Clock to Output
Data Out Hold Time
SCL and SDA Rise Time
SCL and SDA Fall Time
Data In Setup Time
Data In Hold Time
Noise Spike Width
@ SCL, SDA Inputs
Write Cycle Time
Noise Suppression Time Constant
SCL Low to SDA Data Out Valid
SCL Low to SDA Data Out Change
Before New Transmission
Conditions
2.7V to 4.5V
Min
0
4.7
4.0
4.7
4.7
4.0
4.7
0.3
0.3
1000
300
250
0
100
10
3.5
Max
100
4.5V to 5.5V
Min
Max
400
1.3
0.6
1.3
0.6
0.6
0.6
0.2
0.2
300
300
100
0
100
10
0.9
Units
KHz
µs
µs
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
ns
ms
2028 PGM T5.0
f
SCL
t
LOW
t
HIGH
t
BUF
t
SU:STA
t
HD:STA
t
SU:STO
t
AA
t
DH
t
R
t
F
t
SU:DAT
t
HD:DAT
T
I
t
WR
2028-02 4/24/98
4
SMS2916
Preliminary
tGLITCH
VTRIP
VRVALID
tRPD
tPURST
tPURST
VCC
RESET
tRPD
RESET
2028 ILL6.0
FIGURE 4. RESET OUTPUT TIMING
RESET CIRCUIT AC and DC ELECTRICAL CHARACTERISTICS
T
A
= -40°C to +85°C
SMS2916-2.7
Symbol
V
TRIP
t
PURST
t
RPD
V
RVALID
t
GLITCH
V
OLRS
V
OHRS
Reset Trip Point
Power-Up Reset Timeout
V
TRIP
to RESET Output Delay
RESET
Output Valid
Glitch Reject Pulse Width
RESET
Output Low Voltage I
OL
= 1mA
RESET Output High Voltage I
OH
= 800
µA
V
CC
-.75
1
30
0.4
Parameter
Min
2.55
130
Max
2.7
270
5
SMS2916–A
Min
4.25
130
Max
4.5
270
5
1
30
0.4
V
CC
-.75
SMS2916–B
Min
4.5
130
Max
4.75
270
5
1
30
0.4
V
CC
-.75
Unit
V
ms
µs
V
ns
V
V
2028 PGM T6.0
2028-02 4/24/98
5
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