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.
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1. Introduction
Electronic scales are gradually replacing traditional measuring tools like springs and balances in everyday life, such as electronic price computing scales and electronic weigh...[详细]
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